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  1. /**
  2.   ******************************************************************************
  3.   * @file    stm32f1xx_hal_usart.c
  4.   * @author  MCD Application Team
  5.   * @brief   USART HAL module driver.
  6.   *          This file provides firmware functions to manage the following
  7.   *          functionalities of the Universal Synchronous/Asynchronous Receiver Transmitter
  8.   *          Peripheral (USART).
  9.   *           + Initialization and de-initialization functions
  10.   *           + IO operation functions
  11.   *           + Peripheral Control functions
  12.   *
  13.   ******************************************************************************
  14.   * @attention
  15.   *
  16.   * Copyright (c) 2016 STMicroelectronics.
  17.   * All rights reserved.
  18.   *
  19.   * This software is licensed under terms that can be found in the LICENSE file
  20.   * in the root directory of this software component.
  21.   * If no LICENSE file comes with this software, it is provided AS-IS.
  22.   *
  23.   ******************************************************************************
  24.   @verbatim
  25.   ==============================================================================
  26.                         ##### How to use this driver #####
  27.   ==============================================================================
  28.   [..]
  29.     The USART HAL driver can be used as follows:
  30.  
  31.     (#) Declare a USART_HandleTypeDef handle structure (eg. USART_HandleTypeDef husart).
  32.     (#) Initialize the USART low level resources by implementing the HAL_USART_MspInit() API:
  33.         (##) Enable the USARTx interface clock.
  34.         (##) USART pins configuration:
  35.              (+++) Enable the clock for the USART GPIOs.
  36.              (+++) Configure the USART pins as alternate function pull-up.
  37.         (##) NVIC configuration if you need to use interrupt process (HAL_USART_Transmit_IT(),
  38.              HAL_USART_Receive_IT() and HAL_USART_TransmitReceive_IT() APIs):
  39.              (+++) Configure the USARTx interrupt priority.
  40.              (+++) Enable the NVIC USART IRQ handle.
  41.         (##) DMA Configuration if you need to use DMA process (HAL_USART_Transmit_DMA()
  42.              HAL_USART_Receive_DMA() and HAL_USART_TransmitReceive_DMA() APIs):
  43.              (+++) Declare a DMA handle structure for the Tx/Rx channel.
  44.              (+++) Enable the DMAx interface clock.
  45.              (+++) Configure the declared DMA handle structure with the required Tx/Rx parameters.
  46.              (+++) Configure the DMA Tx/Rx channel.
  47.              (+++) Associate the initialized DMA handle to the USART DMA Tx/Rx handle.
  48.              (+++) Configure the priority and enable the NVIC for the transfer complete interrupt on the DMA Tx/Rx channel.
  49.              (+++) Configure the USARTx interrupt priority and enable the NVIC USART IRQ handle
  50.                    (used for last byte sending completion detection in DMA non circular mode)
  51.  
  52.     (#) Program the Baud Rate, Word Length, Stop Bit, Parity, Hardware
  53.         flow control and Mode(Receiver/Transmitter) in the husart Init structure.
  54.  
  55.     (#) Initialize the USART registers by calling the HAL_USART_Init() API:
  56.         (++) These APIs configures also the low level Hardware GPIO, CLOCK, CORTEX...etc)
  57.              by calling the customized HAL_USART_MspInit(&husart) API.
  58.  
  59.         -@@- The specific USART interrupts (Transmission complete interrupt,
  60.              RXNE interrupt and Error Interrupts) will be managed using the macros
  61.              __HAL_USART_ENABLE_IT() and __HAL_USART_DISABLE_IT() inside the transmit and receive process.
  62.  
  63.     (#) Three operation modes are available within this driver :
  64.  
  65.      *** Polling mode IO operation ***
  66.      =================================
  67.      [..]
  68.        (+) Send an amount of data in blocking mode using HAL_USART_Transmit()
  69.        (+) Receive an amount of data in blocking mode using HAL_USART_Receive()
  70.  
  71.      *** Interrupt mode IO operation ***
  72.      ===================================
  73.      [..]
  74.        (+) Send an amount of data in non blocking mode using HAL_USART_Transmit_IT()
  75.        (+) At transmission end of transfer HAL_USART_TxHalfCpltCallback is executed and user can
  76.             add his own code by customization of function pointer HAL_USART_TxCpltCallback
  77.        (+) Receive an amount of data in non blocking mode using HAL_USART_Receive_IT()
  78.        (+) At reception end of transfer HAL_USART_RxCpltCallback is executed and user can
  79.             add his own code by customization of function pointer HAL_USART_RxCpltCallback
  80.        (+) In case of transfer Error, HAL_USART_ErrorCallback() function is executed and user can
  81.             add his own code by customization of function pointer HAL_USART_ErrorCallback
  82.  
  83.      *** DMA mode IO operation ***
  84.      ==============================
  85.      [..]
  86.        (+) Send an amount of data in non blocking mode (DMA) using HAL_USART_Transmit_DMA()
  87.        (+) At transmission end of half transfer HAL_USART_TxHalfCpltCallback is executed and user can
  88.             add his own code by customization of function pointer HAL_USART_TxHalfCpltCallback
  89.        (+) At transmission end of transfer HAL_USART_TxCpltCallback is executed and user can
  90.             add his own code by customization of function pointer HAL_USART_TxCpltCallback
  91.        (+) Receive an amount of data in non blocking mode (DMA) using HAL_USART_Receive_DMA()
  92.        (+) At reception end of half transfer HAL_USART_RxHalfCpltCallback is executed and user can
  93.             add his own code by customization of function pointer HAL_USART_RxHalfCpltCallback
  94.        (+) At reception end of transfer HAL_USART_RxCpltCallback is executed and user can
  95.             add his own code by customization of function pointer HAL_USART_RxCpltCallback
  96.        (+) In case of transfer Error, HAL_USART_ErrorCallback() function is executed and user can
  97.             add his own code by customization of function pointer HAL_USART_ErrorCallback
  98.        (+) Pause the DMA Transfer using HAL_USART_DMAPause()
  99.        (+) Resume the DMA Transfer using HAL_USART_DMAResume()
  100.        (+) Stop the DMA Transfer using HAL_USART_DMAStop()
  101.  
  102.      *** USART HAL driver macros list ***
  103.      =============================================
  104.      [..]
  105.        Below the list of most used macros in USART HAL driver.
  106.  
  107.        (+) __HAL_USART_ENABLE: Enable the USART peripheral
  108.        (+) __HAL_USART_DISABLE: Disable the USART peripheral
  109.        (+) __HAL_USART_GET_FLAG : Check whether the specified USART flag is set or not
  110.        (+) __HAL_USART_CLEAR_FLAG : Clear the specified USART pending flag
  111.        (+) __HAL_USART_ENABLE_IT: Enable the specified USART interrupt
  112.        (+) __HAL_USART_DISABLE_IT: Disable the specified USART interrupt
  113.  
  114.      [..]
  115.        (@) You can refer to the USART HAL driver header file for more useful macros
  116.  
  117.     ##### Callback registration #####
  118.     ==================================
  119.  
  120.     [..]
  121.     The compilation define USE_HAL_USART_REGISTER_CALLBACKS when set to 1
  122.     allows the user to configure dynamically the driver callbacks.
  123.  
  124.     [..]
  125.     Use Function @ref HAL_USART_RegisterCallback() to register a user callback.
  126.     Function @ref HAL_USART_RegisterCallback() allows to register following callbacks:
  127.     (+) TxHalfCpltCallback        : Tx Half Complete Callback.
  128.     (+) TxCpltCallback            : Tx Complete Callback.
  129.     (+) RxHalfCpltCallback        : Rx Half Complete Callback.
  130.     (+) RxCpltCallback            : Rx Complete Callback.
  131.     (+) TxRxCpltCallback          : Tx Rx Complete Callback.
  132.     (+) ErrorCallback             : Error Callback.
  133.     (+) AbortCpltCallback         : Abort Complete Callback.
  134.     (+) MspInitCallback           : USART MspInit.
  135.     (+) MspDeInitCallback         : USART MspDeInit.
  136.     This function takes as parameters the HAL peripheral handle, the Callback ID
  137.     and a pointer to the user callback function.
  138.  
  139.     [..]
  140.     Use function @ref HAL_USART_UnRegisterCallback() to reset a callback to the default
  141.     weak (surcharged) function.
  142.     @ref HAL_USART_UnRegisterCallback() takes as parameters the HAL peripheral handle,
  143.     and the Callback ID.
  144.     This function allows to reset following callbacks:
  145.     (+) TxHalfCpltCallback        : Tx Half Complete Callback.
  146.     (+) TxCpltCallback            : Tx Complete Callback.
  147.     (+) RxHalfCpltCallback        : Rx Half Complete Callback.
  148.     (+) RxCpltCallback            : Rx Complete Callback.
  149.     (+) TxRxCpltCallback          : Tx Rx Complete Callback.
  150.     (+) ErrorCallback             : Error Callback.
  151.     (+) AbortCpltCallback         : Abort Complete Callback.
  152.     (+) MspInitCallback           : USART MspInit.
  153.     (+) MspDeInitCallback         : USART MspDeInit.
  154.  
  155.     [..]
  156.     By default, after the @ref HAL_USART_Init() and when the state is HAL_USART_STATE_RESET
  157.     all callbacks are set to the corresponding weak (surcharged) functions:
  158.     examples @ref HAL_USART_TxCpltCallback(), @ref HAL_USART_RxHalfCpltCallback().
  159.     Exception done for MspInit and MspDeInit functions that are respectively
  160.     reset to the legacy weak (surcharged) functions in the @ref HAL_USART_Init()
  161.     and @ref HAL_USART_DeInit() only when these callbacks are null (not registered beforehand).
  162.     If not, MspInit or MspDeInit are not null, the @ref HAL_USART_Init() and @ref HAL_USART_DeInit()
  163.     keep and use the user MspInit/MspDeInit callbacks (registered beforehand).
  164.  
  165.     [..]
  166.     Callbacks can be registered/unregistered in HAL_USART_STATE_READY state only.
  167.     Exception done MspInit/MspDeInit that can be registered/unregistered
  168.     in HAL_USART_STATE_READY or HAL_USART_STATE_RESET state, thus registered (user)
  169.     MspInit/DeInit callbacks can be used during the Init/DeInit.
  170.     In that case first register the MspInit/MspDeInit user callbacks
  171.     using @ref HAL_USART_RegisterCallback() before calling @ref HAL_USART_DeInit()
  172.     or @ref HAL_USART_Init() function.
  173.  
  174.     [..]
  175.     When The compilation define USE_HAL_USART_REGISTER_CALLBACKS is set to 0 or
  176.     not defined, the callback registration feature is not available
  177.     and weak (surcharged) callbacks are used.
  178.  
  179.   @endverbatim
  180.      [..]
  181.        (@) Additional remark: If the parity is enabled, then the MSB bit of the data written
  182.            in the data register is transmitted but is changed by the parity bit.
  183.            Depending on the frame length defined by the M bit (8-bits or 9-bits),
  184.            the possible USART frame formats are as listed in the following table:
  185.     +-------------------------------------------------------------+
  186.     |   M bit |  PCE bit  |            USART frame                 |
  187.     |---------------------|---------------------------------------|
  188.     |    0    |    0      |    | SB | 8 bit data | STB |          |
  189.     |---------|-----------|---------------------------------------|
  190.     |    0    |    1      |    | SB | 7 bit data | PB | STB |     |
  191.     |---------|-----------|---------------------------------------|
  192.     |    1    |    0      |    | SB | 9 bit data | STB |          |
  193.     |---------|-----------|---------------------------------------|
  194.     |    1    |    1      |    | SB | 8 bit data | PB | STB |     |
  195.     +-------------------------------------------------------------+
  196.   ******************************************************************************
  197.   */
  198.  
  199. /* Includes ------------------------------------------------------------------*/
  200. #include "stm32f1xx_hal.h"
  201.  
  202. /** @addtogroup STM32F1xx_HAL_Driver
  203.   * @{
  204.   */
  205.  
  206. /** @defgroup USART USART
  207.   * @brief HAL USART Synchronous module driver
  208.   * @{
  209.   */
  210. #ifdef HAL_USART_MODULE_ENABLED
  211. /* Private typedef -----------------------------------------------------------*/
  212. /* Private define ------------------------------------------------------------*/
  213. /** @addtogroup USART_Private_Constants
  214.   * @{
  215.   */
  216. #define DUMMY_DATA           0xFFFFU
  217. #define USART_TIMEOUT_VALUE  22000U
  218. /**
  219.   * @}
  220.   */
  221. /* Private macro -------------------------------------------------------------*/
  222. /* Private variables ---------------------------------------------------------*/
  223. /* Private function prototypes -----------------------------------------------*/
  224. /* Private functions ---------------------------------------------------------*/
  225. /** @addtogroup USART_Private_Functions
  226.   * @{
  227.   */
  228. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  229. void USART_InitCallbacksToDefault(USART_HandleTypeDef *husart);
  230. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  231. static void USART_EndTxTransfer(USART_HandleTypeDef *husart);
  232. static void USART_EndRxTransfer(USART_HandleTypeDef *husart);
  233. static HAL_StatusTypeDef USART_Transmit_IT(USART_HandleTypeDef *husart);
  234. static HAL_StatusTypeDef USART_EndTransmit_IT(USART_HandleTypeDef *husart);
  235. static HAL_StatusTypeDef USART_Receive_IT(USART_HandleTypeDef *husart);
  236. static HAL_StatusTypeDef USART_TransmitReceive_IT(USART_HandleTypeDef *husart);
  237. static void USART_SetConfig(USART_HandleTypeDef *husart);
  238. static void USART_DMATransmitCplt(DMA_HandleTypeDef *hdma);
  239. static void USART_DMATxHalfCplt(DMA_HandleTypeDef *hdma);
  240. static void USART_DMAReceiveCplt(DMA_HandleTypeDef *hdma);
  241. static void USART_DMARxHalfCplt(DMA_HandleTypeDef *hdma);
  242. static void USART_DMAError(DMA_HandleTypeDef *hdma);
  243. static void USART_DMAAbortOnError(DMA_HandleTypeDef *hdma);
  244. static void USART_DMATxAbortCallback(DMA_HandleTypeDef *hdma);
  245. static void USART_DMARxAbortCallback(DMA_HandleTypeDef *hdma);
  246.  
  247. static HAL_StatusTypeDef USART_WaitOnFlagUntilTimeout(USART_HandleTypeDef *husart, uint32_t Flag, FlagStatus Status,
  248.                                                       uint32_t Tickstart, uint32_t Timeout);
  249. /**
  250.   * @}
  251.   */
  252.  
  253. /* Exported functions --------------------------------------------------------*/
  254. /** @defgroup USART_Exported_Functions USART Exported Functions
  255.   * @{
  256.   */
  257.  
  258. /** @defgroup USART_Exported_Functions_Group1 USART Initialization and de-initialization functions
  259.   *  @brief    Initialization and Configuration functions
  260.   *
  261. @verbatim
  262.   ==============================================================================
  263.               ##### Initialization and Configuration functions #####
  264.   ==============================================================================
  265.   [..]
  266.   This subsection provides a set of functions allowing to initialize the USART
  267.   in asynchronous and in synchronous modes.
  268.   (+) For the asynchronous mode only these parameters can be configured:
  269.       (++) Baud Rate
  270.       (++) Word Length
  271.       (++) Stop Bit
  272.       (++) Parity: If the parity is enabled, then the MSB bit of the data written
  273.            in the data register is transmitted but is changed by the parity bit.
  274.            Depending on the frame length defined by the M bit (8-bits or 9-bits),
  275.            please refer to Reference manual for possible USART frame formats.
  276.       (++) USART polarity
  277.       (++) USART phase
  278.       (++) USART LastBit
  279.       (++) Receiver/transmitter modes
  280.  
  281.   [..]
  282.     The HAL_USART_Init() function follows the USART  synchronous configuration
  283.     procedures (details for the procedures are available in reference manuals
  284.     (RM0008 for STM32F10Xxx MCUs and RM0041 for STM32F100xx MCUs)).
  285.  
  286. @endverbatim
  287.   * @{
  288.   */
  289.  
  290. /**
  291.   * @brief  Initialize the USART mode according to the specified
  292.   *         parameters in the USART_InitTypeDef and initialize the associated handle.
  293.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  294.   *                the configuration information for the specified USART module.
  295.   * @retval HAL status
  296.   */
  297. HAL_StatusTypeDef HAL_USART_Init(USART_HandleTypeDef *husart)
  298. {
  299.   /* Check the USART handle allocation */
  300.   if (husart == NULL)
  301.   {
  302.     return HAL_ERROR;
  303.   }
  304.  
  305.   /* Check the parameters */
  306.   assert_param(IS_USART_INSTANCE(husart->Instance));
  307.  
  308.   if (husart->State == HAL_USART_STATE_RESET)
  309.   {
  310.     /* Allocate lock resource and initialize it */
  311.     husart->Lock = HAL_UNLOCKED;
  312.  
  313. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  314.     USART_InitCallbacksToDefault(husart);
  315.  
  316.     if (husart->MspInitCallback == NULL)
  317.     {
  318.       husart->MspInitCallback = HAL_USART_MspInit;
  319.     }
  320.  
  321.     /* Init the low level hardware */
  322.     husart->MspInitCallback(husart);
  323. #else
  324.     /* Init the low level hardware : GPIO, CLOCK */
  325.     HAL_USART_MspInit(husart);
  326. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  327.   }
  328.  
  329.   husart->State = HAL_USART_STATE_BUSY;
  330.  
  331.   /* Set the USART Communication parameters */
  332.   USART_SetConfig(husart);
  333.  
  334.   /* In USART mode, the following bits must be kept cleared:
  335.      - LINEN bit in the USART_CR2 register
  336.      - HDSEL, SCEN and IREN bits in the USART_CR3 register */
  337.   CLEAR_BIT(husart->Instance->CR2, USART_CR2_LINEN);
  338.   CLEAR_BIT(husart->Instance->CR3, (USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN));
  339.  
  340.   /* Enable the Peripheral */
  341.   __HAL_USART_ENABLE(husart);
  342.  
  343.   /* Initialize the USART state */
  344.   husart->ErrorCode = HAL_USART_ERROR_NONE;
  345.   husart->State = HAL_USART_STATE_READY;
  346.  
  347.   return HAL_OK;
  348. }
  349.  
  350. /**
  351.   * @brief  DeInitializes the USART peripheral.
  352.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  353.   *                the configuration information for the specified USART module.
  354.   * @retval HAL status
  355.   */
  356. HAL_StatusTypeDef HAL_USART_DeInit(USART_HandleTypeDef *husart)
  357. {
  358.   /* Check the USART handle allocation */
  359.   if (husart == NULL)
  360.   {
  361.     return HAL_ERROR;
  362.   }
  363.  
  364.   /* Check the parameters */
  365.   assert_param(IS_USART_INSTANCE(husart->Instance));
  366.  
  367.   husart->State = HAL_USART_STATE_BUSY;
  368.  
  369.   /* Disable the Peripheral */
  370.   __HAL_USART_DISABLE(husart);
  371.  
  372. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  373.   if (husart->MspDeInitCallback == NULL)
  374.   {
  375.     husart->MspDeInitCallback = HAL_USART_MspDeInit;
  376.   }
  377.   /* DeInit the low level hardware */
  378.   husart->MspDeInitCallback(husart);
  379. #else
  380.   /* DeInit the low level hardware */
  381.   HAL_USART_MspDeInit(husart);
  382. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  383.  
  384.   husart->ErrorCode = HAL_USART_ERROR_NONE;
  385.   husart->State = HAL_USART_STATE_RESET;
  386.  
  387.   /* Release Lock */
  388.   __HAL_UNLOCK(husart);
  389.  
  390.   return HAL_OK;
  391. }
  392.  
  393. /**
  394.   * @brief  USART MSP Init.
  395.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  396.   *                the configuration information for the specified USART module.
  397.   * @retval None
  398.   */
  399. __weak void HAL_USART_MspInit(USART_HandleTypeDef *husart)
  400. {
  401.   /* Prevent unused argument(s) compilation warning */
  402.   UNUSED(husart);
  403.   /* NOTE: This function should not be modified, when the callback is needed,
  404.            the HAL_USART_MspInit could be implemented in the user file
  405.    */
  406. }
  407.  
  408. /**
  409.   * @brief  USART MSP DeInit.
  410.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  411.   *                the configuration information for the specified USART module.
  412.   * @retval None
  413.   */
  414. __weak void HAL_USART_MspDeInit(USART_HandleTypeDef *husart)
  415. {
  416.   /* Prevent unused argument(s) compilation warning */
  417.   UNUSED(husart);
  418.   /* NOTE: This function should not be modified, when the callback is needed,
  419.            the HAL_USART_MspDeInit could be implemented in the user file
  420.    */
  421. }
  422.  
  423. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  424. /**
  425.   * @brief  Register a User USART Callback
  426.   *         To be used instead of the weak predefined callback
  427.   * @note   The HAL_USART_RegisterCallback() may be called before HAL_USART_Init() in HAL_USART_STATE_RESET
  428.   *         to register callbacks for HAL_USART_MSPINIT_CB_ID and HAL_USART_MSPDEINIT_CB_ID
  429.   * @param  husart usart handle
  430.   * @param  CallbackID ID of the callback to be registered
  431.   *         This parameter can be one of the following values:
  432.   *           @arg @ref HAL_USART_TX_HALFCOMPLETE_CB_ID Tx Half Complete Callback ID
  433.   *           @arg @ref HAL_USART_TX_COMPLETE_CB_ID Tx Complete Callback ID
  434.   *           @arg @ref HAL_USART_RX_HALFCOMPLETE_CB_ID Rx Half Complete Callback ID
  435.   *           @arg @ref HAL_USART_RX_COMPLETE_CB_ID Rx Complete Callback ID
  436.   *           @arg @ref HAL_USART_TX_RX_COMPLETE_CB_ID Rx Complete Callback ID
  437.   *           @arg @ref HAL_USART_ERROR_CB_ID Error Callback ID
  438.   *           @arg @ref HAL_USART_ABORT_COMPLETE_CB_ID Abort Complete Callback ID
  439.   *           @arg @ref HAL_USART_MSPINIT_CB_ID MspInit Callback ID
  440.   *           @arg @ref HAL_USART_MSPDEINIT_CB_ID MspDeInit Callback ID
  441.   * @param  pCallback pointer to the Callback function
  442.   * @retval HAL status
  443. +  */
  444. HAL_StatusTypeDef HAL_USART_RegisterCallback(USART_HandleTypeDef *husart, HAL_USART_CallbackIDTypeDef CallbackID,
  445.                                              pUSART_CallbackTypeDef pCallback)
  446. {
  447.   HAL_StatusTypeDef status = HAL_OK;
  448.  
  449.   if (pCallback == NULL)
  450.   {
  451.     /* Update the error code */
  452.     husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  453.  
  454.     return HAL_ERROR;
  455.   }
  456.  
  457.   if (husart->State == HAL_USART_STATE_READY)
  458.   {
  459.     switch (CallbackID)
  460.     {
  461.       case HAL_USART_TX_HALFCOMPLETE_CB_ID :
  462.         husart->TxHalfCpltCallback = pCallback;
  463.         break;
  464.  
  465.       case HAL_USART_TX_COMPLETE_CB_ID :
  466.         husart->TxCpltCallback = pCallback;
  467.         break;
  468.  
  469.       case HAL_USART_RX_HALFCOMPLETE_CB_ID :
  470.         husart->RxHalfCpltCallback = pCallback;
  471.         break;
  472.  
  473.       case HAL_USART_RX_COMPLETE_CB_ID :
  474.         husart->RxCpltCallback = pCallback;
  475.         break;
  476.  
  477.       case HAL_USART_TX_RX_COMPLETE_CB_ID :
  478.         husart->TxRxCpltCallback = pCallback;
  479.         break;
  480.  
  481.       case HAL_USART_ERROR_CB_ID :
  482.         husart->ErrorCallback = pCallback;
  483.         break;
  484.  
  485.       case HAL_USART_ABORT_COMPLETE_CB_ID :
  486.         husart->AbortCpltCallback = pCallback;
  487.         break;
  488.  
  489.       case HAL_USART_MSPINIT_CB_ID :
  490.         husart->MspInitCallback = pCallback;
  491.         break;
  492.  
  493.       case HAL_USART_MSPDEINIT_CB_ID :
  494.         husart->MspDeInitCallback = pCallback;
  495.         break;
  496.  
  497.       default :
  498.         /* Update the error code */
  499.         husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  500.  
  501.         /* Return error status */
  502.         status =  HAL_ERROR;
  503.         break;
  504.     }
  505.   }
  506.   else if (husart->State == HAL_USART_STATE_RESET)
  507.   {
  508.     switch (CallbackID)
  509.     {
  510.       case HAL_USART_MSPINIT_CB_ID :
  511.         husart->MspInitCallback = pCallback;
  512.         break;
  513.  
  514.       case HAL_USART_MSPDEINIT_CB_ID :
  515.         husart->MspDeInitCallback = pCallback;
  516.         break;
  517.  
  518.       default :
  519.         /* Update the error code */
  520.         husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  521.  
  522.         /* Return error status */
  523.         status =  HAL_ERROR;
  524.         break;
  525.     }
  526.   }
  527.   else
  528.   {
  529.     /* Update the error code */
  530.     husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  531.  
  532.     /* Return error status */
  533.     status =  HAL_ERROR;
  534.   }
  535.  
  536.   return status;
  537. }
  538.  
  539. /**
  540.   * @brief  Unregister an USART Callback
  541.   *         USART callaback is redirected to the weak predefined callback
  542.   * @note   The HAL_USART_UnRegisterCallback() may be called before HAL_USART_Init() in HAL_USART_STATE_RESET
  543.   *         to un-register callbacks for HAL_USART_MSPINIT_CB_ID and HAL_USART_MSPDEINIT_CB_ID
  544.   * @param  husart usart handle
  545.   * @param  CallbackID ID of the callback to be unregistered
  546.   *         This parameter can be one of the following values:
  547.   *           @arg @ref HAL_USART_TX_HALFCOMPLETE_CB_ID Tx Half Complete Callback ID
  548.   *           @arg @ref HAL_USART_TX_COMPLETE_CB_ID Tx Complete Callback ID
  549.   *           @arg @ref HAL_USART_RX_HALFCOMPLETE_CB_ID Rx Half Complete Callback ID
  550.   *           @arg @ref HAL_USART_RX_COMPLETE_CB_ID Rx Complete Callback ID
  551.   *           @arg @ref HAL_USART_TX_RX_COMPLETE_CB_ID Rx Complete Callback ID
  552.   *           @arg @ref HAL_USART_ERROR_CB_ID Error Callback ID
  553.   *           @arg @ref HAL_USART_ABORT_COMPLETE_CB_ID Abort Complete Callback ID
  554.   *           @arg @ref HAL_USART_MSPINIT_CB_ID MspInit Callback ID
  555.   *           @arg @ref HAL_USART_MSPDEINIT_CB_ID MspDeInit Callback ID
  556.   * @retval HAL status
  557.   */
  558. HAL_StatusTypeDef HAL_USART_UnRegisterCallback(USART_HandleTypeDef *husart, HAL_USART_CallbackIDTypeDef CallbackID)
  559. {
  560.   HAL_StatusTypeDef status = HAL_OK;
  561.  
  562.   if (husart->State == HAL_USART_STATE_READY)
  563.   {
  564.     switch (CallbackID)
  565.     {
  566.       case HAL_USART_TX_HALFCOMPLETE_CB_ID :
  567.         husart->TxHalfCpltCallback = HAL_USART_TxHalfCpltCallback;               /* Legacy weak  TxHalfCpltCallback       */
  568.         break;
  569.  
  570.       case HAL_USART_TX_COMPLETE_CB_ID :
  571.         husart->TxCpltCallback = HAL_USART_TxCpltCallback;                       /* Legacy weak TxCpltCallback            */
  572.         break;
  573.  
  574.       case HAL_USART_RX_HALFCOMPLETE_CB_ID :
  575.         husart->RxHalfCpltCallback = HAL_USART_RxHalfCpltCallback;               /* Legacy weak RxHalfCpltCallback        */
  576.         break;
  577.  
  578.       case HAL_USART_RX_COMPLETE_CB_ID :
  579.         husart->RxCpltCallback = HAL_USART_RxCpltCallback;                       /* Legacy weak RxCpltCallback            */
  580.         break;
  581.  
  582.       case HAL_USART_TX_RX_COMPLETE_CB_ID :
  583.         husart->TxRxCpltCallback = HAL_USART_TxRxCpltCallback;                   /* Legacy weak TxRxCpltCallback            */
  584.         break;
  585.  
  586.       case HAL_USART_ERROR_CB_ID :
  587.         husart->ErrorCallback = HAL_USART_ErrorCallback;                         /* Legacy weak ErrorCallback             */
  588.         break;
  589.  
  590.       case HAL_USART_ABORT_COMPLETE_CB_ID :
  591.         husart->AbortCpltCallback = HAL_USART_AbortCpltCallback;                 /* Legacy weak AbortCpltCallback         */
  592.         break;
  593.  
  594.       case HAL_USART_MSPINIT_CB_ID :
  595.         husart->MspInitCallback = HAL_USART_MspInit;                             /* Legacy weak MspInitCallback           */
  596.         break;
  597.  
  598.       case HAL_USART_MSPDEINIT_CB_ID :
  599.         husart->MspDeInitCallback = HAL_USART_MspDeInit;                         /* Legacy weak MspDeInitCallback         */
  600.         break;
  601.  
  602.       default :
  603.         /* Update the error code */
  604.         husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  605.  
  606.         /* Return error status */
  607.         status =  HAL_ERROR;
  608.         break;
  609.     }
  610.   }
  611.   else if (husart->State == HAL_USART_STATE_RESET)
  612.   {
  613.     switch (CallbackID)
  614.     {
  615.       case HAL_USART_MSPINIT_CB_ID :
  616.         husart->MspInitCallback = HAL_USART_MspInit;
  617.         break;
  618.  
  619.       case HAL_USART_MSPDEINIT_CB_ID :
  620.         husart->MspDeInitCallback = HAL_USART_MspDeInit;
  621.         break;
  622.  
  623.       default :
  624.         /* Update the error code */
  625.         husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  626.  
  627.         /* Return error status */
  628.         status =  HAL_ERROR;
  629.         break;
  630.     }
  631.   }
  632.   else
  633.   {
  634.     /* Update the error code */
  635.     husart->ErrorCode |= HAL_USART_ERROR_INVALID_CALLBACK;
  636.  
  637.     /* Return error status */
  638.     status =  HAL_ERROR;
  639.   }
  640.  
  641.   return status;
  642. }
  643. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  644.  
  645. /**
  646.   * @}
  647.   */
  648.  
  649. /** @defgroup USART_Exported_Functions_Group2 IO operation functions
  650.   *  @brief   USART Transmit and Receive functions
  651.   *
  652. @verbatim
  653.   ==============================================================================
  654.                          ##### IO operation functions #####
  655.   ==============================================================================
  656.   [..]
  657.     This subsection provides a set of functions allowing to manage the USART synchronous
  658.     data transfers.
  659.  
  660.   [..]
  661.     The USART supports master mode only: it cannot receive or send data related to an input
  662.     clock (SCLK is always an output).
  663.  
  664.     (#) There are two modes of transfer:
  665.         (++) Blocking mode: The communication is performed in polling mode.
  666.              The HAL status of all data processing is returned by the same function
  667.              after finishing transfer.
  668.         (++) No-Blocking mode: The communication is performed using Interrupts
  669.              or DMA, These API's return the HAL status.
  670.              The end of the data processing will be indicated through the
  671.              dedicated USART IRQ when using Interrupt mode or the DMA IRQ when
  672.              using DMA mode.
  673.              The HAL_USART_TxCpltCallback(), HAL_USART_RxCpltCallback() and HAL_USART_TxRxCpltCallback()
  674.               user callbacks
  675.              will be executed respectively at the end of the transmit or Receive process
  676.              The HAL_USART_ErrorCallback() user callback will be executed when a communication
  677.              error is detected
  678.  
  679.     (#) Blocking mode APIs are :
  680.         (++) HAL_USART_Transmit() in simplex mode
  681.         (++) HAL_USART_Receive() in full duplex receive only
  682.         (++) HAL_USART_TransmitReceive() in full duplex mode
  683.  
  684.     (#) Non Blocking mode APIs with Interrupt are :
  685.         (++) HAL_USART_Transmit_IT()in simplex mode
  686.         (++) HAL_USART_Receive_IT() in full duplex receive only
  687.         (++) HAL_USART_TransmitReceive_IT() in full duplex mode
  688.         (++) HAL_USART_IRQHandler()
  689.  
  690.     (#) Non Blocking mode functions with DMA are :
  691.         (++) HAL_USART_Transmit_DMA()in simplex mode
  692.         (++) HAL_USART_Receive_DMA() in full duplex receive only
  693.         (++) HAL_USART_TransmitReceive_DMA() in full duplex mode
  694.         (++) HAL_USART_DMAPause()
  695.         (++) HAL_USART_DMAResume()
  696.         (++) HAL_USART_DMAStop()
  697.  
  698.     (#) A set of Transfer Complete Callbacks are provided in non Blocking mode:
  699.         (++) HAL_USART_TxHalfCpltCallback()
  700.         (++) HAL_USART_TxCpltCallback()
  701.         (++) HAL_USART_RxHalfCpltCallback()
  702.         (++) HAL_USART_RxCpltCallback()
  703.         (++) HAL_USART_ErrorCallback()
  704.         (++) HAL_USART_TxRxCpltCallback()
  705.  
  706.     (#) Non-Blocking mode transfers could be aborted using Abort API's :
  707.         (++) HAL_USART_Abort()
  708.         (++) HAL_USART_Abort_IT()
  709.  
  710.     (#) For Abort services based on interrupts (HAL_USART_Abort_IT), a Abort Complete Callbacks is provided:
  711.         (++) HAL_USART_AbortCpltCallback()
  712.  
  713.     (#) In Non-Blocking mode transfers, possible errors are split into 2 categories.
  714.         Errors are handled as follows :
  715.         (++) Error is considered as Recoverable and non blocking : Transfer could go till end, but error severity is
  716.              to be evaluated by user : this concerns Frame Error, Parity Error or Noise Error in Interrupt mode reception .
  717.              Received character is then retrieved and stored in Rx buffer, Error code is set to allow user to identify error type,
  718.              and HAL_USART_ErrorCallback() user callback is executed. Transfer is kept ongoing on USART side.
  719.              If user wants to abort it, Abort services should be called by user.
  720.         (++) Error is considered as Blocking : Transfer could not be completed properly and is aborted.
  721.              This concerns Overrun Error In Interrupt mode reception and all errors in DMA mode.
  722.              Error code is set to allow user to identify error type, and HAL_USART_ErrorCallback() user callback is executed.
  723.  
  724. @endverbatim
  725.   * @{
  726.   */
  727.  
  728. /**
  729.   * @brief  Simplex Send an amount of data in blocking mode.
  730.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  731.   *         the sent data is handled as a set of u16. In this case, Size must indicate the number
  732.   *         of u16 provided through pTxData.
  733.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  734.   *                 the configuration information for the specified USART module.
  735.   * @param  pTxData Pointer to data buffer (u8 or u16 data elements).
  736.   * @param  Size    Amount of data elements (u8 or u16) to be sent.
  737.   * @param  Timeout Timeout duration.
  738.   * @retval HAL status
  739.   */
  740. HAL_StatusTypeDef HAL_USART_Transmit(USART_HandleTypeDef *husart, const uint8_t *pTxData, uint16_t Size, uint32_t Timeout)
  741. {
  742.   const uint8_t  *ptxdata8bits;
  743.   const uint16_t *ptxdata16bits;
  744.   uint32_t tickstart;
  745.  
  746.   if (husart->State == HAL_USART_STATE_READY)
  747.   {
  748.     if ((pTxData == NULL) || (Size == 0))
  749.     {
  750.       return  HAL_ERROR;
  751.     }
  752.  
  753.     /* Process Locked */
  754.     __HAL_LOCK(husart);
  755.  
  756.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  757.     husart->State = HAL_USART_STATE_BUSY_TX;
  758.  
  759.     /* Init tickstart for timeout management */
  760.     tickstart = HAL_GetTick();
  761.  
  762.     husart->TxXferSize = Size;
  763.     husart->TxXferCount = Size;
  764.  
  765.     /* In case of 9bits/No Parity transfer, pTxData needs to be handled as a uint16_t pointer */
  766.     if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  767.     {
  768.       ptxdata8bits  = NULL;
  769.       ptxdata16bits = (const uint16_t *) pTxData;
  770.     }
  771.     else
  772.     {
  773.       ptxdata8bits  = pTxData;
  774.       ptxdata16bits = NULL;
  775.     }
  776.  
  777.     while (husart->TxXferCount > 0U)
  778.     {
  779.       /* Wait for TXE flag in order to write data in DR */
  780.       if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
  781.       {
  782.         return HAL_TIMEOUT;
  783.       }
  784.       if (ptxdata8bits == NULL)
  785.       {
  786.         husart->Instance->DR = (uint16_t)(*ptxdata16bits & (uint16_t)0x01FF);
  787.         ptxdata16bits++;
  788.       }
  789.       else
  790.       {
  791.         husart->Instance->DR = (uint8_t)(*ptxdata8bits & (uint8_t)0xFF);
  792.         ptxdata8bits++;
  793.       }
  794.  
  795.       husart->TxXferCount--;
  796.     }
  797.  
  798.     if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TC, RESET, tickstart, Timeout) != HAL_OK)
  799.     {
  800.       return HAL_TIMEOUT;
  801.     }
  802.  
  803.     husart->State = HAL_USART_STATE_READY;
  804.  
  805.     /* Process Unlocked */
  806.     __HAL_UNLOCK(husart);
  807.  
  808.     return HAL_OK;
  809.   }
  810.   else
  811.   {
  812.     return HAL_BUSY;
  813.   }
  814. }
  815.  
  816. /**
  817.   * @brief  Full-Duplex Receive an amount of data in blocking mode.
  818.   * @note   To receive synchronous data, dummy data are simultaneously transmitted.
  819.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  820.   *         the received data is handled as a set of u16. In this case, Size must indicate the number
  821.   *         of u16 available through pRxData.
  822.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  823.   *                 the configuration information for the specified USART module.
  824.   * @param  pRxData Pointer to data buffer (u8 or u16 data elements).
  825.   * @param  Size    Amount of data elements (u8 or u16) to be received.
  826.   * @param  Timeout Timeout duration.
  827.   * @retval HAL status
  828.   */
  829. HAL_StatusTypeDef HAL_USART_Receive(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size, uint32_t Timeout)
  830. {
  831.   uint8_t  *prxdata8bits;
  832.   uint16_t *prxdata16bits;
  833.   uint32_t tickstart;
  834.  
  835.   if (husart->State == HAL_USART_STATE_READY)
  836.   {
  837.     if ((pRxData == NULL) || (Size == 0))
  838.     {
  839.       return  HAL_ERROR;
  840.     }
  841.     /* Process Locked */
  842.     __HAL_LOCK(husart);
  843.  
  844.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  845.     husart->State = HAL_USART_STATE_BUSY_RX;
  846.  
  847.     /* Init tickstart for timeout management */
  848.     tickstart = HAL_GetTick();
  849.  
  850.     husart->RxXferSize = Size;
  851.     husart->RxXferCount = Size;
  852.  
  853.     /* In case of 9bits/No Parity transfer, pRxData needs to be handled as a uint16_t pointer */
  854.     if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  855.     {
  856.       prxdata8bits  = NULL;
  857.       prxdata16bits = (uint16_t *) pRxData;
  858.     }
  859.     else
  860.     {
  861.       prxdata8bits  = pRxData;
  862.       prxdata16bits = NULL;
  863.     }
  864.  
  865.     /* Check the remain data to be received */
  866.     while (husart->RxXferCount > 0U)
  867.     {
  868.       /* Wait until TXE flag is set to send dummy byte in order to generate the
  869.       * clock for the slave to send data.
  870.       * Whatever the frame length (7, 8 or 9-bit long), the same dummy value
  871.       * can be written for all the cases. */
  872.       if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
  873.       {
  874.         return HAL_TIMEOUT;
  875.       }
  876.       husart->Instance->DR = (DUMMY_DATA & (uint16_t)0x0FF);
  877.  
  878.       /* Wait until RXNE flag is set to receive the byte */
  879.       if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
  880.       {
  881.         return HAL_TIMEOUT;
  882.       }
  883.  
  884.       if (prxdata8bits == NULL)
  885.       {
  886.         *prxdata16bits = (uint16_t)(husart->Instance->DR & (uint16_t)0x01FF);
  887.         prxdata16bits++;
  888.       }
  889.       else
  890.       {
  891.         if ((husart->Init.WordLength == USART_WORDLENGTH_9B) || ((husart->Init.WordLength == USART_WORDLENGTH_8B) && (husart->Init.Parity == USART_PARITY_NONE)))
  892.         {
  893.           *prxdata8bits = (uint8_t)(husart->Instance->DR & (uint8_t)0x0FF);
  894.         }
  895.         else
  896.         {
  897.           *prxdata8bits = (uint8_t)(husart->Instance->DR & (uint8_t)0x07F);
  898.         }
  899.         prxdata8bits++;
  900.       }
  901.       husart->RxXferCount--;
  902.     }
  903.  
  904.     husart->State = HAL_USART_STATE_READY;
  905.  
  906.     /* Process Unlocked */
  907.     __HAL_UNLOCK(husart);
  908.  
  909.     return HAL_OK;
  910.   }
  911.   else
  912.   {
  913.     return HAL_BUSY;
  914.   }
  915. }
  916.  
  917. /**
  918.   * @brief  Full-Duplex Send and Receive an amount of data in full-duplex mode (blocking mode).
  919.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  920.   *         the sent data and the received data are handled as sets of u16. In this case, Size must indicate the number
  921.   *         of u16 available through pTxData and through pRxData.
  922.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  923.   *                 the configuration information for the specified USART module.
  924.   * @param  pTxData Pointer to TX data buffer (u8 or u16 data elements).
  925.   * @param  pRxData Pointer to RX data buffer (u8 or u16 data elements).
  926.   * @param  Size    Amount of data elements (u8 or u16) to be sent (same amount to be received).
  927.   * @param  Timeout Timeout duration
  928.   * @retval HAL status
  929.   */
  930. HAL_StatusTypeDef HAL_USART_TransmitReceive(USART_HandleTypeDef *husart, const uint8_t *pTxData, uint8_t *pRxData,
  931.                                             uint16_t Size, uint32_t Timeout)
  932. {
  933.   uint8_t  *prxdata8bits;
  934.   uint16_t *prxdata16bits;
  935.   const uint8_t  *ptxdata8bits;
  936.   const uint16_t *ptxdata16bits;
  937.   uint16_t rxdatacount;
  938.   uint32_t tickstart;
  939.  
  940.   if (husart->State == HAL_USART_STATE_READY)
  941.   {
  942.     if ((pTxData == NULL) || (pRxData == NULL) || (Size == 0))
  943.     {
  944.       return  HAL_ERROR;
  945.     }
  946.  
  947.     /* In case of 9bits/No Parity transfer, pTxData and pRxData buffers provided as input parameter
  948.        should be aligned on a u16 frontier, as data to be filled into TDR/retrieved from RDR will be
  949.        handled through a u16 cast. */
  950.     if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  951.     {
  952.       if (((((uint32_t)pTxData) & 1U) != 0U) || ((((uint32_t)pRxData) & 1U) != 0U))
  953.       {
  954.         return  HAL_ERROR;
  955.       }
  956.     }
  957.     /* Process Locked */
  958.     __HAL_LOCK(husart);
  959.  
  960.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  961.     husart->State = HAL_USART_STATE_BUSY_RX;
  962.  
  963.     /* Init tickstart for timeout management */
  964.     tickstart = HAL_GetTick();
  965.  
  966.     husart->RxXferSize = Size;
  967.     husart->TxXferSize = Size;
  968.     husart->TxXferCount = Size;
  969.     husart->RxXferCount = Size;
  970.  
  971.     /* In case of 9bits/No Parity transfer, pRxData needs to be handled as a uint16_t pointer */
  972.     if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  973.     {
  974.       prxdata8bits  = NULL;
  975.       ptxdata8bits  = NULL;
  976.       ptxdata16bits = (const uint16_t *) pTxData;
  977.       prxdata16bits = (uint16_t *) pRxData;
  978.     }
  979.     else
  980.     {
  981.       prxdata8bits  = pRxData;
  982.       ptxdata8bits  = pTxData;
  983.       ptxdata16bits = NULL;
  984.       prxdata16bits = NULL;
  985.     }
  986.  
  987.     /* Check the remain data to be received */
  988.     /* rxdatacount is a temporary variable for MISRAC2012-Rule-13.5 */
  989.     rxdatacount = husart->RxXferCount;
  990.     while ((husart->TxXferCount > 0U) || (rxdatacount > 0U))
  991.     {
  992.       if (husart->TxXferCount > 0U)
  993.       {
  994.         /* Wait for TXE flag in order to write data in DR */
  995.         if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_TXE, RESET, tickstart, Timeout) != HAL_OK)
  996.         {
  997.           return HAL_TIMEOUT;
  998.         }
  999.  
  1000.         if (ptxdata8bits == NULL)
  1001.         {
  1002.           husart->Instance->DR = (uint16_t)(*ptxdata16bits & (uint16_t)0x01FF);
  1003.           ptxdata16bits++;
  1004.         }
  1005.         else
  1006.         {
  1007.           husart->Instance->DR = (uint8_t)(*ptxdata8bits & (uint8_t)0xFF);
  1008.           ptxdata8bits++;
  1009.         }
  1010.  
  1011.         husart->TxXferCount--;
  1012.       }
  1013.  
  1014.       if (husart->RxXferCount > 0U)
  1015.       {
  1016.         /* Wait for RXNE Flag */
  1017.         if (USART_WaitOnFlagUntilTimeout(husart, USART_FLAG_RXNE, RESET, tickstart, Timeout) != HAL_OK)
  1018.         {
  1019.           return HAL_TIMEOUT;
  1020.         }
  1021.         if (prxdata8bits == NULL)
  1022.         {
  1023.           *prxdata16bits = (uint16_t)(husart->Instance->DR & (uint16_t)0x01FF);
  1024.           prxdata16bits++;
  1025.         }
  1026.         else
  1027.         {
  1028.           if ((husart->Init.WordLength == USART_WORDLENGTH_9B) || ((husart->Init.WordLength == USART_WORDLENGTH_8B) && (husart->Init.Parity == USART_PARITY_NONE)))
  1029.           {
  1030.             *prxdata8bits = (uint8_t)(husart->Instance->DR & (uint8_t)0x0FF);
  1031.           }
  1032.           else
  1033.           {
  1034.             *prxdata8bits = (uint8_t)(husart->Instance->DR & (uint8_t)0x07F);
  1035.           }
  1036.  
  1037.           prxdata8bits++;
  1038.         }
  1039.  
  1040.         husart->RxXferCount--;
  1041.       }
  1042.       rxdatacount = husart->RxXferCount;
  1043.     }
  1044.  
  1045.     husart->State = HAL_USART_STATE_READY;
  1046.  
  1047.     /* Process Unlocked */
  1048.     __HAL_UNLOCK(husart);
  1049.  
  1050.     return HAL_OK;
  1051.   }
  1052.   else
  1053.   {
  1054.     return HAL_BUSY;
  1055.   }
  1056. }
  1057.  
  1058. /**
  1059.   * @brief  Simplex Send an amount of data in non-blocking mode.
  1060.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  1061.   *         the sent data is handled as a set of u16. In this case, Size must indicate the number
  1062.   *         of u16 provided through pTxData.
  1063.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  1064.   *                 the configuration information for the specified USART module.
  1065.   * @param  pTxData Pointer to data buffer (u8 or u16 data elements).
  1066.   * @param  Size    Amount of data elements (u8 or u16) to be sent.
  1067.   * @retval HAL status
  1068.   * @note   The USART errors are not managed to avoid the overrun error.
  1069.   */
  1070. HAL_StatusTypeDef HAL_USART_Transmit_IT(USART_HandleTypeDef *husart, const uint8_t *pTxData, uint16_t Size)
  1071. {
  1072.   if (husart->State == HAL_USART_STATE_READY)
  1073.   {
  1074.     if ((pTxData == NULL) || (Size == 0))
  1075.     {
  1076.       return HAL_ERROR;
  1077.     }
  1078.  
  1079.     /* Process Locked */
  1080.     __HAL_LOCK(husart);
  1081.  
  1082.     husart->pTxBuffPtr = pTxData;
  1083.     husart->TxXferSize = Size;
  1084.     husart->TxXferCount = Size;
  1085.  
  1086.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1087.     husart->State = HAL_USART_STATE_BUSY_TX;
  1088.  
  1089.     /* The USART Error Interrupts: (Frame error, Noise error, Overrun error)
  1090.        are not managed by the USART transmit process to avoid the overrun interrupt
  1091.        when the USART mode is configured for transmit and receive "USART_MODE_TX_RX"
  1092.        to benefit for the frame error and noise interrupts the USART mode should be
  1093.        configured only for transmit "USART_MODE_TX"
  1094.        The __HAL_USART_ENABLE_IT(husart, USART_IT_ERR) can be used to enable the Frame error,
  1095.        Noise error interrupt */
  1096.  
  1097.     /* Process Unlocked */
  1098.     __HAL_UNLOCK(husart);
  1099.  
  1100.     /* Enable the USART Transmit Data Register Empty Interrupt */
  1101.     SET_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
  1102.  
  1103.     return HAL_OK;
  1104.   }
  1105.   else
  1106.   {
  1107.     return HAL_BUSY;
  1108.   }
  1109. }
  1110.  
  1111. /**
  1112.   * @brief  Simplex Receive an amount of data in non-blocking mode.
  1113.   * @note   To receive synchronous data, dummy data are simultaneously transmitted.
  1114.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  1115.   *         the received data is handled as a set of u16. In this case, Size must indicate the number
  1116.   *         of u16 available through pRxData.
  1117.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  1118.   *                 the configuration information for the specified USART module.
  1119.   * @param  pRxData Pointer to data buffer (u8 or u16 data elements).
  1120.   * @param  Size    Amount of data elements (u8 or u16) to be received.
  1121.   * @retval HAL status
  1122.   */
  1123. HAL_StatusTypeDef HAL_USART_Receive_IT(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size)
  1124. {
  1125.   if (husart->State == HAL_USART_STATE_READY)
  1126.   {
  1127.     if ((pRxData == NULL) || (Size == 0))
  1128.     {
  1129.       return HAL_ERROR;
  1130.     }
  1131.     /* Process Locked */
  1132.     __HAL_LOCK(husart);
  1133.  
  1134.     husart->pRxBuffPtr = pRxData;
  1135.     husart->RxXferSize = Size;
  1136.     husart->RxXferCount = Size;
  1137.  
  1138.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1139.     husart->State = HAL_USART_STATE_BUSY_RX;
  1140.  
  1141.     /* Process Unlocked */
  1142.     __HAL_UNLOCK(husart);
  1143.  
  1144.     if (husart->Init.Parity != USART_PARITY_NONE)
  1145.     {
  1146.       /* Enable the USART Parity Error and Data Register not empty Interrupts */
  1147.       SET_BIT(husart->Instance->CR1, USART_CR1_PEIE | USART_CR1_RXNEIE);
  1148.     }
  1149.     else
  1150.     {
  1151.       /* Enable the USART Data Register not empty Interrupts */
  1152.       SET_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);
  1153.     }
  1154.  
  1155.     /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  1156.     SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
  1157.  
  1158.     /* Send dummy byte in order to generate the clock for the slave to send data */
  1159.     husart->Instance->DR = (DUMMY_DATA & (uint16_t)0x01FF);
  1160.  
  1161.     return HAL_OK;
  1162.   }
  1163.   else
  1164.   {
  1165.     return HAL_BUSY;
  1166.   }
  1167. }
  1168.  
  1169. /**
  1170.   * @brief  Full-Duplex Send and Receive an amount of data in full-duplex mode (non-blocking).
  1171.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  1172.   *         the sent data and the received data are handled as sets of u16. In this case, Size must indicate the number
  1173.   *         of u16 available through pTxData and through pRxData.
  1174.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  1175.   *                 the configuration information for the specified USART module.
  1176.   * @param  pTxData Pointer to TX data buffer (u8 or u16 data elements).
  1177.   * @param  pRxData Pointer to RX data buffer (u8 or u16 data elements).
  1178.   * @param  Size    Amount of data elements (u8 or u16) to be sent (same amount to be received).
  1179.   * @retval HAL status
  1180.   */
  1181. HAL_StatusTypeDef HAL_USART_TransmitReceive_IT(USART_HandleTypeDef *husart, const uint8_t *pTxData, uint8_t *pRxData,
  1182.                                                uint16_t Size)
  1183. {
  1184.   if (husart->State == HAL_USART_STATE_READY)
  1185.   {
  1186.     if ((pTxData == NULL) || (pRxData == NULL) || (Size == 0))
  1187.     {
  1188.       return HAL_ERROR;
  1189.     }
  1190.     /* Process Locked */
  1191.     __HAL_LOCK(husart);
  1192.  
  1193.     husart->pRxBuffPtr = pRxData;
  1194.     husart->RxXferSize = Size;
  1195.     husart->RxXferCount = Size;
  1196.     husart->pTxBuffPtr = pTxData;
  1197.     husart->TxXferSize = Size;
  1198.     husart->TxXferCount = Size;
  1199.  
  1200.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1201.     husart->State = HAL_USART_STATE_BUSY_TX_RX;
  1202.  
  1203.     /* Process Unlocked */
  1204.     __HAL_UNLOCK(husart);
  1205.  
  1206.     /* Enable the USART Data Register not empty Interrupt */
  1207.     SET_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);
  1208.  
  1209.     if (husart->Init.Parity != USART_PARITY_NONE)
  1210.     {
  1211.       /* Enable the USART Parity Error Interrupt */
  1212.       SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  1213.     }
  1214.  
  1215.     /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  1216.     SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
  1217.  
  1218.     /* Enable the USART Transmit Data Register Empty Interrupt */
  1219.     SET_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
  1220.  
  1221.     return HAL_OK;
  1222.   }
  1223.   else
  1224.   {
  1225.     return HAL_BUSY;
  1226.   }
  1227. }
  1228.  
  1229. /**
  1230.   * @brief  Simplex Send an amount of data in DMA mode.
  1231.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  1232.   *         the sent data is handled as a set of u16. In this case, Size must indicate the number
  1233.   *         of u16 provided through pTxData.
  1234.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  1235.   *                 the configuration information for the specified USART module.
  1236.   * @param  pTxData Pointer to data buffer (u8 or u16 data elements).
  1237.   * @param  Size    Amount of data elements (u8 or u16) to be sent.
  1238.   * @retval HAL status
  1239.   */
  1240. HAL_StatusTypeDef HAL_USART_Transmit_DMA(USART_HandleTypeDef *husart, const uint8_t *pTxData, uint16_t Size)
  1241. {
  1242.   const uint32_t *tmp;
  1243.  
  1244.   if (husart->State == HAL_USART_STATE_READY)
  1245.   {
  1246.     if ((pTxData == NULL) || (Size == 0))
  1247.     {
  1248.       return HAL_ERROR;
  1249.     }
  1250.     /* Process Locked */
  1251.     __HAL_LOCK(husart);
  1252.  
  1253.     husart->pTxBuffPtr = pTxData;
  1254.     husart->TxXferSize = Size;
  1255.     husart->TxXferCount = Size;
  1256.  
  1257.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1258.     husart->State = HAL_USART_STATE_BUSY_TX;
  1259.  
  1260.     /* Set the USART DMA transfer complete callback */
  1261.     husart->hdmatx->XferCpltCallback = USART_DMATransmitCplt;
  1262.  
  1263.     /* Set the USART DMA Half transfer complete callback */
  1264.     husart->hdmatx->XferHalfCpltCallback = USART_DMATxHalfCplt;
  1265.  
  1266.     /* Set the DMA error callback */
  1267.     husart->hdmatx->XferErrorCallback = USART_DMAError;
  1268.  
  1269.     /* Set the DMA abort callback */
  1270.     husart->hdmatx->XferAbortCallback = NULL;
  1271.  
  1272.     /* Enable the USART transmit DMA channel */
  1273.     tmp = (const uint32_t *)&pTxData;
  1274.     HAL_DMA_Start_IT(husart->hdmatx, *(const uint32_t *)tmp, (uint32_t)&husart->Instance->DR, Size);
  1275.  
  1276.     /* Clear the TC flag in the SR register by writing 0 to it */
  1277.     __HAL_USART_CLEAR_FLAG(husart, USART_FLAG_TC);
  1278.  
  1279.     /* Process Unlocked */
  1280.     __HAL_UNLOCK(husart);
  1281.  
  1282.     /* Enable the DMA transfer for transmit request by setting the DMAT bit
  1283.     in the USART CR3 register */
  1284.     SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1285.  
  1286.     return HAL_OK;
  1287.   }
  1288.   else
  1289.   {
  1290.     return HAL_BUSY;
  1291.   }
  1292. }
  1293.  
  1294. /**
  1295.   * @brief  Full-Duplex Receive an amount of data in DMA mode.
  1296.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  1297.   *         the received data is handled as a set of u16. In this case, Size must indicate the number
  1298.   *         of u16 available through pRxData.
  1299.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  1300.   *                 the configuration information for the specified USART module.
  1301.   * @param  pRxData Pointer to data buffer (u8 or u16 data elements).
  1302.   * @param  Size    Amount of data elements (u8 or u16) to be received.
  1303.   * @retval HAL status
  1304.   * @note   The USART DMA transmit channel must be configured in order to generate the clock for the slave.
  1305.   * @note   When the USART parity is enabled (PCE = 1) the data received contain the parity bit.
  1306.   */
  1307. HAL_StatusTypeDef HAL_USART_Receive_DMA(USART_HandleTypeDef *husart, uint8_t *pRxData, uint16_t Size)
  1308. {
  1309.   uint32_t *tmp;
  1310.  
  1311.   if (husart->State == HAL_USART_STATE_READY)
  1312.   {
  1313.     if ((pRxData == NULL) || (Size == 0))
  1314.     {
  1315.       return HAL_ERROR;
  1316.     }
  1317.  
  1318.     /* Process Locked */
  1319.     __HAL_LOCK(husart);
  1320.  
  1321.     husart->pRxBuffPtr = pRxData;
  1322.     husart->RxXferSize = Size;
  1323.     husart->pTxBuffPtr = pRxData;
  1324.     husart->TxXferSize = Size;
  1325.  
  1326.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1327.     husart->State = HAL_USART_STATE_BUSY_RX;
  1328.  
  1329.     /* Set the USART DMA Rx transfer complete callback */
  1330.     husart->hdmarx->XferCpltCallback = USART_DMAReceiveCplt;
  1331.  
  1332.     /* Set the USART DMA Half transfer complete callback */
  1333.     husart->hdmarx->XferHalfCpltCallback = USART_DMARxHalfCplt;
  1334.  
  1335.     /* Set the USART DMA Rx transfer error callback */
  1336.     husart->hdmarx->XferErrorCallback = USART_DMAError;
  1337.  
  1338.     /* Set the DMA abort callback */
  1339.     husart->hdmarx->XferAbortCallback = NULL;
  1340.  
  1341.     /* Set the USART Tx DMA transfer complete callback as NULL because the communication closing
  1342.     is performed in DMA reception complete callback  */
  1343.     husart->hdmatx->XferHalfCpltCallback = NULL;
  1344.     husart->hdmatx->XferCpltCallback = NULL;
  1345.  
  1346.     /* Set the DMA error callback */
  1347.     husart->hdmatx->XferErrorCallback = USART_DMAError;
  1348.  
  1349.     /* Set the DMA AbortCpltCallback */
  1350.     husart->hdmatx->XferAbortCallback = NULL;
  1351.  
  1352.     /* Enable the USART receive DMA channel */
  1353.     tmp = (uint32_t *)&pRxData;
  1354.     HAL_DMA_Start_IT(husart->hdmarx, (uint32_t)&husart->Instance->DR, *(uint32_t *)tmp, Size);
  1355.  
  1356.     /* Enable the USART transmit DMA channel: the transmit channel is used in order
  1357.        to generate in the non-blocking mode the clock to the slave device,
  1358.        this mode isn't a simplex receive mode but a full-duplex receive one */
  1359.     HAL_DMA_Start_IT(husart->hdmatx, *(uint32_t *)tmp, (uint32_t)&husart->Instance->DR, Size);
  1360.  
  1361.     /* Clear the Overrun flag just before enabling the DMA Rx request: mandatory for the second transfer */
  1362.     __HAL_USART_CLEAR_OREFLAG(husart);
  1363.  
  1364.     /* Process Unlocked */
  1365.     __HAL_UNLOCK(husart);
  1366.  
  1367.     if (husart->Init.Parity != USART_PARITY_NONE)
  1368.     {
  1369.       /* Enable the USART Parity Error Interrupt */
  1370.       SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  1371.     }
  1372.  
  1373.     /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  1374.     SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
  1375.  
  1376.     /* Enable the DMA transfer for the receiver request by setting the DMAR bit
  1377.        in the USART CR3 register */
  1378.     SET_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  1379.  
  1380.     /* Enable the DMA transfer for transmit request by setting the DMAT bit
  1381.        in the USART CR3 register */
  1382.     SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1383.  
  1384.     return HAL_OK;
  1385.   }
  1386.   else
  1387.   {
  1388.     return HAL_BUSY;
  1389.   }
  1390. }
  1391.  
  1392. /**
  1393.   * @brief  Full-Duplex Transmit Receive an amount of data in DMA mode.
  1394.   * @note   When USART parity is not enabled (PCE = 0), and Word Length is configured to 9 bits (M1-M0 = 01),
  1395.   *         the sent data and the received data are handled as sets of u16. In this case, Size must indicate the number
  1396.   *         of u16 available through pTxData and through pRxData.
  1397.   * @param  husart  Pointer to a USART_HandleTypeDef structure that contains
  1398.   *                 the configuration information for the specified USART module.
  1399.   * @param  pTxData Pointer to TX data buffer (u8 or u16 data elements).
  1400.   * @param  pRxData Pointer to RX data buffer (u8 or u16 data elements).
  1401.   * @param  Size    Amount of data elements (u8 or u16) to be received/sent.
  1402.   * @note   When the USART parity is enabled (PCE = 1) the data received contain the parity bit.
  1403.   * @retval HAL status
  1404.   */
  1405. HAL_StatusTypeDef HAL_USART_TransmitReceive_DMA(USART_HandleTypeDef *husart, const uint8_t *pTxData, uint8_t *pRxData,
  1406.                                                 uint16_t Size)
  1407. {
  1408.   const uint32_t *tmp;
  1409.  
  1410.   if (husart->State == HAL_USART_STATE_READY)
  1411.   {
  1412.     if ((pTxData == NULL) || (pRxData == NULL) || (Size == 0))
  1413.     {
  1414.       return HAL_ERROR;
  1415.     }
  1416.     /* Process Locked */
  1417.     __HAL_LOCK(husart);
  1418.  
  1419.     husart->pRxBuffPtr = pRxData;
  1420.     husart->RxXferSize = Size;
  1421.     husart->pTxBuffPtr = pTxData;
  1422.     husart->TxXferSize = Size;
  1423.  
  1424.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1425.     husart->State = HAL_USART_STATE_BUSY_TX_RX;
  1426.  
  1427.     /* Set the USART DMA Rx transfer complete callback */
  1428.     husart->hdmarx->XferCpltCallback = USART_DMAReceiveCplt;
  1429.  
  1430.     /* Set the USART DMA Half transfer complete callback */
  1431.     husart->hdmarx->XferHalfCpltCallback = USART_DMARxHalfCplt;
  1432.  
  1433.     /* Set the USART DMA Tx transfer complete callback */
  1434.     husart->hdmatx->XferCpltCallback = USART_DMATransmitCplt;
  1435.  
  1436.     /* Set the USART DMA Half transfer complete callback */
  1437.     husart->hdmatx->XferHalfCpltCallback = USART_DMATxHalfCplt;
  1438.  
  1439.     /* Set the USART DMA Tx transfer error callback */
  1440.     husart->hdmatx->XferErrorCallback = USART_DMAError;
  1441.  
  1442.     /* Set the USART DMA Rx transfer error callback */
  1443.     husart->hdmarx->XferErrorCallback = USART_DMAError;
  1444.  
  1445.     /* Set the DMA abort callback */
  1446.     husart->hdmarx->XferAbortCallback = NULL;
  1447.  
  1448.     /* Enable the USART receive DMA channel */
  1449.     tmp = (uint32_t *)&pRxData;
  1450.     HAL_DMA_Start_IT(husart->hdmarx, (uint32_t)&husart->Instance->DR, *(const uint32_t *)tmp, Size);
  1451.  
  1452.     /* Enable the USART transmit DMA channel */
  1453.     tmp = (const uint32_t *)&pTxData;
  1454.     HAL_DMA_Start_IT(husart->hdmatx, *(const uint32_t *)tmp, (uint32_t)&husart->Instance->DR, Size);
  1455.  
  1456.     /* Clear the TC flag in the SR register by writing 0 to it */
  1457.     __HAL_USART_CLEAR_FLAG(husart, USART_FLAG_TC);
  1458.  
  1459.     /* Clear the Overrun flag: mandatory for the second transfer in circular mode */
  1460.     __HAL_USART_CLEAR_OREFLAG(husart);
  1461.  
  1462.     /* Process Unlocked */
  1463.     __HAL_UNLOCK(husart);
  1464.  
  1465.     if (husart->Init.Parity != USART_PARITY_NONE)
  1466.     {
  1467.       /* Enable the USART Parity Error Interrupt */
  1468.       SET_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  1469.     }
  1470.  
  1471.     /* Enable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  1472.     SET_BIT(husart->Instance->CR3, USART_CR3_EIE);
  1473.  
  1474.     /* Enable the DMA transfer for the receiver request by setting the DMAR bit
  1475.        in the USART CR3 register */
  1476.     SET_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  1477.  
  1478.     /* Enable the DMA transfer for transmit request by setting the DMAT bit
  1479.        in the USART CR3 register */
  1480.     SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1481.  
  1482.     return HAL_OK;
  1483.   }
  1484.   else
  1485.   {
  1486.     return HAL_BUSY;
  1487.   }
  1488. }
  1489.  
  1490. /**
  1491.   * @brief  Pauses the DMA Transfer.
  1492.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1493.   *                the configuration information for the specified USART module.
  1494.   * @retval HAL status
  1495.   */
  1496. HAL_StatusTypeDef HAL_USART_DMAPause(USART_HandleTypeDef *husart)
  1497. {
  1498.   /* Process Locked */
  1499.   __HAL_LOCK(husart);
  1500.  
  1501.   /* Disable the USART DMA Tx request */
  1502.   CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1503.  
  1504.   /* Process Unlocked */
  1505.   __HAL_UNLOCK(husart);
  1506.  
  1507.   return HAL_OK;
  1508. }
  1509.  
  1510. /**
  1511.   * @brief  Resumes the DMA Transfer.
  1512.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1513.   *                the configuration information for the specified USART module.
  1514.   * @retval HAL status
  1515.   */
  1516. HAL_StatusTypeDef HAL_USART_DMAResume(USART_HandleTypeDef *husart)
  1517. {
  1518.   /* Process Locked */
  1519.   __HAL_LOCK(husart);
  1520.  
  1521.   /* Enable the USART DMA Tx request */
  1522.   SET_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1523.  
  1524.   /* Process Unlocked */
  1525.   __HAL_UNLOCK(husart);
  1526.  
  1527.   return HAL_OK;
  1528. }
  1529.  
  1530. /**
  1531.   * @brief  Stops the DMA Transfer.
  1532.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1533.   *                the configuration information for the specified USART module.
  1534.   * @retval HAL status
  1535.   */
  1536. HAL_StatusTypeDef HAL_USART_DMAStop(USART_HandleTypeDef *husart)
  1537. {
  1538.   uint32_t dmarequest = 0x00U;
  1539.   /* The Lock is not implemented on this API to allow the user application
  1540.      to call the HAL USART API under callbacks HAL_USART_TxCpltCallback() / HAL_USART_RxCpltCallback():
  1541.      when calling HAL_DMA_Abort() API the DMA TX/RX Transfer complete interrupt is generated
  1542.      and the correspond call back is executed HAL_USART_TxCpltCallback() / HAL_USART_RxCpltCallback()
  1543.      */
  1544.  
  1545.   /* Stop USART DMA Tx request if ongoing */
  1546.   dmarequest = HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT);
  1547.   if ((husart->State == HAL_USART_STATE_BUSY_TX) && dmarequest)
  1548.   {
  1549.     USART_EndTxTransfer(husart);
  1550.  
  1551.     /* Abort the USART DMA Tx channel */
  1552.     if (husart->hdmatx != NULL)
  1553.     {
  1554.       HAL_DMA_Abort(husart->hdmatx);
  1555.     }
  1556.  
  1557.     /* Disable the USART Tx DMA request */
  1558.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1559.   }
  1560.  
  1561.   /* Stop USART DMA Rx request if ongoing */
  1562.   dmarequest = HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR);
  1563.   if ((husart->State == HAL_USART_STATE_BUSY_RX) && dmarequest)
  1564.   {
  1565.     USART_EndRxTransfer(husart);
  1566.  
  1567.     /* Abort the USART DMA Rx channel */
  1568.     if (husart->hdmarx != NULL)
  1569.     {
  1570.       HAL_DMA_Abort(husart->hdmarx);
  1571.     }
  1572.  
  1573.     /* Disable the USART Rx DMA request */
  1574.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  1575.   }
  1576.  
  1577.   return HAL_OK;
  1578. }
  1579.  
  1580. /**
  1581.   * @brief  Abort ongoing transfer (blocking mode).
  1582.   * @param  husart USART handle.
  1583.   * @note   This procedure could be used for aborting any ongoing transfer (either Tx or Rx,
  1584.   *         as described by TransferType parameter) started in Interrupt or DMA mode.
  1585.   *         This procedure performs following operations :
  1586.   *           - Disable PPP Interrupts (depending of transfer direction)
  1587.   *           - Disable the DMA transfer in the peripheral register (if enabled)
  1588.   *           - Abort DMA transfer by calling HAL_DMA_Abort (in case of transfer in DMA mode)
  1589.   *           - Set handle State to READY
  1590.   * @note   This procedure is executed in blocking mode : when exiting function, Abort is considered as completed.
  1591.   * @retval HAL status
  1592.   */
  1593. HAL_StatusTypeDef HAL_USART_Abort(USART_HandleTypeDef *husart)
  1594. {
  1595.   /* Disable TXEIE, TCIE, RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */
  1596.   CLEAR_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_TXEIE | USART_CR1_TCIE));
  1597.   CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  1598.  
  1599.   /* Disable the USART DMA Tx request if enabled */
  1600.   if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT))
  1601.   {
  1602.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1603.  
  1604.     /* Abort the USART DMA Tx channel : use blocking DMA Abort API (no callback) */
  1605.     if (husart->hdmatx != NULL)
  1606.     {
  1607.       /* Set the USART DMA Abort callback to Null.
  1608.          No call back execution at end of DMA abort procedure */
  1609.       husart->hdmatx->XferAbortCallback = NULL;
  1610.  
  1611.       HAL_DMA_Abort(husart->hdmatx);
  1612.     }
  1613.   }
  1614.  
  1615.   /* Disable the USART DMA Rx request if enabled */
  1616.   if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR))
  1617.   {
  1618.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  1619.  
  1620.     /* Abort the USART DMA Rx channel : use blocking DMA Abort API (no callback) */
  1621.     if (husart->hdmarx != NULL)
  1622.     {
  1623.       /* Set the USART DMA Abort callback to Null.
  1624.          No call back execution at end of DMA abort procedure */
  1625.       husart->hdmarx->XferAbortCallback = NULL;
  1626.  
  1627.       HAL_DMA_Abort(husart->hdmarx);
  1628.     }
  1629.   }
  1630.  
  1631.   /* Reset Tx and Rx transfer counters */
  1632.   husart->TxXferCount = 0x00U;
  1633.   husart->RxXferCount = 0x00U;
  1634.  
  1635.   /* Restore husart->State to Ready */
  1636.   husart->State  = HAL_USART_STATE_READY;
  1637.  
  1638.   /* Reset Handle ErrorCode to No Error */
  1639.   husart->ErrorCode = HAL_USART_ERROR_NONE;
  1640.  
  1641.   return HAL_OK;
  1642. }
  1643.  
  1644. /**
  1645.   * @brief  Abort ongoing transfer (Interrupt mode).
  1646.   * @param  husart USART handle.
  1647.   * @note   This procedure could be used for aborting any ongoing transfer (either Tx or Rx,
  1648.   *         as described by TransferType parameter) started in Interrupt or DMA mode.
  1649.   *         This procedure performs following operations :
  1650.   *           - Disable PPP Interrupts (depending of transfer direction)
  1651.   *           - Disable the DMA transfer in the peripheral register (if enabled)
  1652.   *           - Abort DMA transfer by calling HAL_DMA_Abort_IT (in case of transfer in DMA mode)
  1653.   *           - Set handle State to READY
  1654.   *           - At abort completion, call user abort complete callback
  1655.   * @note   This procedure is executed in Interrupt mode, meaning that abort procedure could be
  1656.   *         considered as completed only when user abort complete callback is executed (not when exiting function).
  1657.   * @retval HAL status
  1658.   */
  1659. HAL_StatusTypeDef HAL_USART_Abort_IT(USART_HandleTypeDef *husart)
  1660. {
  1661.   uint32_t AbortCplt = 0x01U;
  1662.  
  1663.   /* Disable TXEIE, TCIE, RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */
  1664.   CLEAR_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_TXEIE | USART_CR1_TCIE));
  1665.   CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  1666.  
  1667.   /* If DMA Tx and/or DMA Rx Handles are associated to USART Handle, DMA Abort complete callbacks should be initialised
  1668.      before any call to DMA Abort functions */
  1669.   /* DMA Tx Handle is valid */
  1670.   if (husart->hdmatx != NULL)
  1671.   {
  1672.     /* Set DMA Abort Complete callback if USART DMA Tx request if enabled.
  1673.        Otherwise, set it to NULL */
  1674.     if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT))
  1675.     {
  1676.       husart->hdmatx->XferAbortCallback = USART_DMATxAbortCallback;
  1677.     }
  1678.     else
  1679.     {
  1680.       husart->hdmatx->XferAbortCallback = NULL;
  1681.     }
  1682.   }
  1683.   /* DMA Rx Handle is valid */
  1684.   if (husart->hdmarx != NULL)
  1685.   {
  1686.     /* Set DMA Abort Complete callback if USART DMA Rx request if enabled.
  1687.        Otherwise, set it to NULL */
  1688.     if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR))
  1689.     {
  1690.       husart->hdmarx->XferAbortCallback = USART_DMARxAbortCallback;
  1691.     }
  1692.     else
  1693.     {
  1694.       husart->hdmarx->XferAbortCallback = NULL;
  1695.     }
  1696.   }
  1697.  
  1698.   /* Disable the USART DMA Tx request if enabled */
  1699.   if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT))
  1700.   {
  1701.     /* Disable DMA Tx at USART level */
  1702.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  1703.  
  1704.     /* Abort the USART DMA Tx channel : use non blocking DMA Abort API (callback) */
  1705.     if (husart->hdmatx != NULL)
  1706.     {
  1707.       /* USART Tx DMA Abort callback has already been initialised :
  1708.          will lead to call HAL_USART_AbortCpltCallback() at end of DMA abort procedure */
  1709.  
  1710.       /* Abort DMA TX */
  1711.       if (HAL_DMA_Abort_IT(husart->hdmatx) != HAL_OK)
  1712.       {
  1713.         husart->hdmatx->XferAbortCallback = NULL;
  1714.       }
  1715.       else
  1716.       {
  1717.         AbortCplt = 0x00U;
  1718.       }
  1719.     }
  1720.   }
  1721.  
  1722.   /* Disable the USART DMA Rx request if enabled */
  1723.   if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR))
  1724.   {
  1725.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  1726.  
  1727.     /* Abort the USART DMA Rx channel : use non blocking DMA Abort API (callback) */
  1728.     if (husart->hdmarx != NULL)
  1729.     {
  1730.       /* USART Rx DMA Abort callback has already been initialised :
  1731.          will lead to call HAL_USART_AbortCpltCallback() at end of DMA abort procedure */
  1732.  
  1733.       /* Abort DMA RX */
  1734.       if (HAL_DMA_Abort_IT(husart->hdmarx) != HAL_OK)
  1735.       {
  1736.         husart->hdmarx->XferAbortCallback = NULL;
  1737.         AbortCplt = 0x01U;
  1738.       }
  1739.       else
  1740.       {
  1741.         AbortCplt = 0x00U;
  1742.       }
  1743.     }
  1744.   }
  1745.  
  1746.   /* if no DMA abort complete callback execution is required => call user Abort Complete callback */
  1747.   if (AbortCplt  == 0x01U)
  1748.   {
  1749.     /* Reset Tx and Rx transfer counters */
  1750.     husart->TxXferCount = 0x00U;
  1751.     husart->RxXferCount = 0x00U;
  1752.  
  1753.     /* Reset errorCode */
  1754.     husart->ErrorCode = HAL_USART_ERROR_NONE;
  1755.  
  1756.     /* Restore husart->State to Ready */
  1757.     husart->State  = HAL_USART_STATE_READY;
  1758.  
  1759.     /* As no DMA to be aborted, call directly user Abort complete callback */
  1760. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  1761.     /* Call registered Abort Complete Callback */
  1762.     husart->AbortCpltCallback(husart);
  1763. #else
  1764.     /* Call legacy weak Abort Complete Callback */
  1765.     HAL_USART_AbortCpltCallback(husart);
  1766. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  1767.   }
  1768.  
  1769.   return HAL_OK;
  1770. }
  1771.  
  1772. /**
  1773.   * @brief  This function handles USART interrupt request.
  1774.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1775.   *                the configuration information for the specified USART module.
  1776.   * @retval None
  1777.   */
  1778. void HAL_USART_IRQHandler(USART_HandleTypeDef *husart)
  1779. {
  1780.   uint32_t isrflags = READ_REG(husart->Instance->SR);
  1781.   uint32_t cr1its   = READ_REG(husart->Instance->CR1);
  1782.   uint32_t cr3its   = READ_REG(husart->Instance->CR3);
  1783.   uint32_t errorflags = 0x00U;
  1784.   uint32_t dmarequest = 0x00U;
  1785.  
  1786.   /* If no error occurs */
  1787.   errorflags = (isrflags & (uint32_t)(USART_SR_PE | USART_SR_FE | USART_SR_ORE | USART_SR_NE));
  1788.   if (errorflags == RESET)
  1789.   {
  1790.     /* USART in mode Receiver -------------------------------------------------*/
  1791.     if (((isrflags & USART_SR_RXNE) != RESET) && ((cr1its & USART_CR1_RXNEIE) != RESET))
  1792.     {
  1793.       if (husart->State == HAL_USART_STATE_BUSY_RX)
  1794.       {
  1795.         USART_Receive_IT(husart);
  1796.       }
  1797.       else
  1798.       {
  1799.         USART_TransmitReceive_IT(husart);
  1800.       }
  1801.       return;
  1802.     }
  1803.   }
  1804.   /* If some errors occur */
  1805.   if ((errorflags != RESET) && (((cr3its & USART_CR3_EIE) != RESET) || ((cr1its & (USART_CR1_RXNEIE | USART_CR1_PEIE)) != RESET)))
  1806.   {
  1807.     /* USART parity error interrupt occurred ----------------------------------*/
  1808.     if (((isrflags & USART_SR_PE) != RESET) && ((cr1its & USART_CR1_PEIE) != RESET))
  1809.     {
  1810.       husart->ErrorCode |= HAL_USART_ERROR_PE;
  1811.     }
  1812.  
  1813.     /* USART noise error interrupt occurred --------------------------------*/
  1814.     if (((isrflags & USART_SR_NE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
  1815.     {
  1816.       husart->ErrorCode |= HAL_USART_ERROR_NE;
  1817.     }
  1818.  
  1819.     /* USART frame error interrupt occurred --------------------------------*/
  1820.     if (((isrflags & USART_SR_FE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
  1821.     {
  1822.       husart->ErrorCode |= HAL_USART_ERROR_FE;
  1823.     }
  1824.  
  1825.     /* USART Over-Run interrupt occurred -----------------------------------*/
  1826.     if (((isrflags & USART_SR_ORE) != RESET) && (((cr1its & USART_CR1_RXNEIE) != RESET) || ((cr3its & USART_CR3_EIE) != RESET)))
  1827.     {
  1828.       husart->ErrorCode |= HAL_USART_ERROR_ORE;
  1829.     }
  1830.  
  1831.     if (husart->ErrorCode != HAL_USART_ERROR_NONE)
  1832.     {
  1833.       /* USART in mode Receiver -----------------------------------------------*/
  1834.       if (((isrflags & USART_SR_RXNE) != RESET) && ((cr1its & USART_CR1_RXNEIE) != RESET))
  1835.       {
  1836.         if (husart->State == HAL_USART_STATE_BUSY_RX)
  1837.         {
  1838.           USART_Receive_IT(husart);
  1839.         }
  1840.         else
  1841.         {
  1842.           USART_TransmitReceive_IT(husart);
  1843.         }
  1844.       }
  1845.       /* If Overrun error occurs, or if any error occurs in DMA mode reception,
  1846.       consider error as blocking */
  1847.       dmarequest = HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR);
  1848.       if (((husart->ErrorCode & HAL_USART_ERROR_ORE) != RESET) || dmarequest)
  1849.       {
  1850.         /* Set the USART state ready to be able to start again the process,
  1851.         Disable Rx Interrupts, and disable Rx DMA request, if ongoing */
  1852.         USART_EndRxTransfer(husart);
  1853.  
  1854.         /* Disable the USART DMA Rx request if enabled */
  1855.         if (HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR))
  1856.         {
  1857.           CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  1858.  
  1859.           /* Abort the USART DMA Rx channel */
  1860.           if (husart->hdmarx != NULL)
  1861.           {
  1862.             /* Set the USART DMA Abort callback :
  1863.             will lead to call HAL_USART_ErrorCallback() at end of DMA abort procedure */
  1864.             husart->hdmarx->XferAbortCallback = USART_DMAAbortOnError;
  1865.  
  1866.             if (HAL_DMA_Abort_IT(husart->hdmarx) != HAL_OK)
  1867.             {
  1868.               /* Call Directly XferAbortCallback function in case of error */
  1869.               husart->hdmarx->XferAbortCallback(husart->hdmarx);
  1870.             }
  1871.           }
  1872.           else
  1873.           {
  1874.             /* Call user error callback */
  1875. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  1876.             /* Call registered Error Callback */
  1877.             husart->ErrorCallback(husart);
  1878. #else
  1879.             /* Call legacy weak Error Callback */
  1880.             HAL_USART_ErrorCallback(husart);
  1881. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  1882.           }
  1883.         }
  1884.         else
  1885.         {
  1886.           /* Call user error callback */
  1887. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  1888.           /* Call registered Error Callback */
  1889.           husart->ErrorCallback(husart);
  1890. #else
  1891.           /* Call legacy weak Error Callback */
  1892.           HAL_USART_ErrorCallback(husart);
  1893. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  1894.         }
  1895.       }
  1896.       else
  1897.       {
  1898.         /* Call user error callback */
  1899. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  1900.         /* Call registered Error Callback */
  1901.         husart->ErrorCallback(husart);
  1902. #else
  1903.         /* Call legacy weak Error Callback */
  1904.         HAL_USART_ErrorCallback(husart);
  1905. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  1906.         husart->ErrorCode = HAL_USART_ERROR_NONE;
  1907.       }
  1908.     }
  1909.     return;
  1910.   }
  1911.  
  1912.   /* USART in mode Transmitter -----------------------------------------------*/
  1913.   if (((isrflags & USART_SR_TXE) != RESET) && ((cr1its & USART_CR1_TXEIE) != RESET))
  1914.   {
  1915.     if (husart->State == HAL_USART_STATE_BUSY_TX)
  1916.     {
  1917.       USART_Transmit_IT(husart);
  1918.     }
  1919.     else
  1920.     {
  1921.       USART_TransmitReceive_IT(husart);
  1922.     }
  1923.     return;
  1924.   }
  1925.  
  1926.   /* USART in mode Transmitter (transmission end) ----------------------------*/
  1927.   if (((isrflags & USART_SR_TC) != RESET) && ((cr1its & USART_CR1_TCIE) != RESET))
  1928.   {
  1929.     USART_EndTransmit_IT(husart);
  1930.     return;
  1931.   }
  1932. }
  1933.  
  1934. /**
  1935.   * @brief  Tx Transfer completed callbacks.
  1936.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1937.   *                the configuration information for the specified USART module.
  1938.   * @retval None
  1939.   */
  1940. __weak void HAL_USART_TxCpltCallback(USART_HandleTypeDef *husart)
  1941. {
  1942.   /* Prevent unused argument(s) compilation warning */
  1943.   UNUSED(husart);
  1944.   /* NOTE: This function should not be modified, when the callback is needed,
  1945.            the HAL_USART_TxCpltCallback could be implemented in the user file
  1946.    */
  1947. }
  1948.  
  1949. /**
  1950.   * @brief  Tx Half Transfer completed callbacks.
  1951.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1952.   *                the configuration information for the specified USART module.
  1953.   * @retval None
  1954.   */
  1955. __weak void HAL_USART_TxHalfCpltCallback(USART_HandleTypeDef *husart)
  1956. {
  1957.   /* Prevent unused argument(s) compilation warning */
  1958.   UNUSED(husart);
  1959.   /* NOTE: This function should not be modified, when the callback is needed,
  1960.            the HAL_USART_TxHalfCpltCallback could be implemented in the user file
  1961.    */
  1962. }
  1963.  
  1964. /**
  1965.   * @brief  Rx Transfer completed callbacks.
  1966.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1967.   *                the configuration information for the specified USART module.
  1968.   * @retval None
  1969.   */
  1970. __weak void HAL_USART_RxCpltCallback(USART_HandleTypeDef *husart)
  1971. {
  1972.   /* Prevent unused argument(s) compilation warning */
  1973.   UNUSED(husart);
  1974.   /* NOTE: This function should not be modified, when the callback is needed,
  1975.            the HAL_USART_RxCpltCallback could be implemented in the user file
  1976.    */
  1977. }
  1978.  
  1979. /**
  1980.   * @brief  Rx Half Transfer completed callbacks.
  1981.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1982.   *                the configuration information for the specified USART module.
  1983.   * @retval None
  1984.   */
  1985. __weak void HAL_USART_RxHalfCpltCallback(USART_HandleTypeDef *husart)
  1986. {
  1987.   /* Prevent unused argument(s) compilation warning */
  1988.   UNUSED(husart);
  1989.   /* NOTE: This function should not be modified, when the callback is needed,
  1990.            the HAL_USART_RxHalfCpltCallback could be implemented in the user file
  1991.    */
  1992. }
  1993.  
  1994. /**
  1995.   * @brief  Tx/Rx Transfers completed callback for the non-blocking process.
  1996.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  1997.   *                the configuration information for the specified USART module.
  1998.   * @retval None
  1999.   */
  2000. __weak void HAL_USART_TxRxCpltCallback(USART_HandleTypeDef *husart)
  2001. {
  2002.   /* Prevent unused argument(s) compilation warning */
  2003.   UNUSED(husart);
  2004.   /* NOTE: This function should not be modified, when the callback is needed,
  2005.            the HAL_USART_TxRxCpltCallback could be implemented in the user file
  2006.    */
  2007. }
  2008.  
  2009. /**
  2010.   * @brief  USART error callbacks.
  2011.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2012.   *                the configuration information for the specified USART module.
  2013.   * @retval None
  2014.   */
  2015. __weak void HAL_USART_ErrorCallback(USART_HandleTypeDef *husart)
  2016. {
  2017.   /* Prevent unused argument(s) compilation warning */
  2018.   UNUSED(husart);
  2019.   /* NOTE: This function should not be modified, when the callback is needed,
  2020.            the HAL_USART_ErrorCallback could be implemented in the user file
  2021.    */
  2022. }
  2023.  
  2024. /**
  2025.   * @brief  USART Abort Complete callback.
  2026.   * @param  husart USART handle.
  2027.   * @retval None
  2028.   */
  2029. __weak void HAL_USART_AbortCpltCallback(USART_HandleTypeDef *husart)
  2030. {
  2031.   /* Prevent unused argument(s) compilation warning */
  2032.   UNUSED(husart);
  2033.  
  2034.   /* NOTE : This function should not be modified, when the callback is needed,
  2035.             the HAL_USART_AbortCpltCallback can be implemented in the user file.
  2036.    */
  2037. }
  2038.  
  2039. /**
  2040.   * @}
  2041.   */
  2042.  
  2043. /** @defgroup USART_Exported_Functions_Group3 Peripheral State and Errors functions
  2044.   *  @brief   USART State and Errors functions
  2045.   *
  2046. @verbatim
  2047.   ==============================================================================
  2048.                   ##### Peripheral State and Errors functions #####
  2049.   ==============================================================================
  2050.   [..]
  2051.     This subsection provides a set of functions allowing to return the State of
  2052.     USART communication
  2053.     process, return Peripheral Errors occurred during communication process
  2054.      (+) HAL_USART_GetState() API can be helpful to check in run-time the state
  2055.          of the USART peripheral.
  2056.      (+) HAL_USART_GetError() check in run-time errors that could be occurred during
  2057.          communication.
  2058. @endverbatim
  2059.   * @{
  2060.   */
  2061.  
  2062. /**
  2063.   * @brief  Returns the USART state.
  2064.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2065.   *                the configuration information for the specified USART module.
  2066.   * @retval HAL state
  2067.   */
  2068. HAL_USART_StateTypeDef HAL_USART_GetState(const USART_HandleTypeDef *husart)
  2069. {
  2070.   return husart->State;
  2071. }
  2072.  
  2073. /**
  2074.   * @brief  Return the USART error code
  2075.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2076.   *                the configuration information for the specified USART.
  2077.   * @retval USART Error Code
  2078.   */
  2079. uint32_t HAL_USART_GetError(const USART_HandleTypeDef *husart)
  2080. {
  2081.   return husart->ErrorCode;
  2082. }
  2083.  
  2084. /**
  2085.   * @}
  2086.   */
  2087.  
  2088. /** @defgroup USART_Private_Functions USART Private Functions
  2089.  * @{
  2090.  */
  2091.  
  2092. /**
  2093.   * @brief  Initialize the callbacks to their default values.
  2094.   * @param  husart USART handle.
  2095.   * @retval none
  2096.   */
  2097. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2098. void USART_InitCallbacksToDefault(USART_HandleTypeDef *husart)
  2099. {
  2100.   /* Init the USART Callback settings */
  2101.   husart->TxHalfCpltCallback        = HAL_USART_TxHalfCpltCallback;        /* Legacy weak TxHalfCpltCallback        */
  2102.   husart->TxCpltCallback            = HAL_USART_TxCpltCallback;            /* Legacy weak TxCpltCallback            */
  2103.   husart->RxHalfCpltCallback        = HAL_USART_RxHalfCpltCallback;        /* Legacy weak RxHalfCpltCallback        */
  2104.   husart->RxCpltCallback            = HAL_USART_RxCpltCallback;            /* Legacy weak RxCpltCallback            */
  2105.   husart->TxRxCpltCallback          = HAL_USART_TxRxCpltCallback;          /* Legacy weak TxRxCpltCallback          */
  2106.   husart->ErrorCallback             = HAL_USART_ErrorCallback;             /* Legacy weak ErrorCallback             */
  2107.   husart->AbortCpltCallback         = HAL_USART_AbortCpltCallback;         /* Legacy weak AbortCpltCallback         */
  2108. }
  2109. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2110.  
  2111. /**
  2112.   * @brief  DMA USART transmit process complete callback.
  2113.   * @param  hdma Pointer to a DMA_HandleTypeDef structure that contains
  2114.   *              the configuration information for the specified DMA module.
  2115.   * @retval None
  2116.   */
  2117. static void USART_DMATransmitCplt(DMA_HandleTypeDef *hdma)
  2118. {
  2119.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2120.   /* DMA Normal mode */
  2121.   if ((hdma->Instance->CCR & DMA_CCR_CIRC) == 0U)
  2122.   {
  2123.     husart->TxXferCount = 0U;
  2124.     if (husart->State == HAL_USART_STATE_BUSY_TX)
  2125.     {
  2126.       /* Disable the DMA transfer for transmit request by resetting the DMAT bit
  2127.          in the USART CR3 register */
  2128.       CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  2129.  
  2130.       /* Enable the USART Transmit Complete Interrupt */
  2131.       SET_BIT(husart->Instance->CR1, USART_CR1_TCIE);
  2132.     }
  2133.   }
  2134.   /* DMA Circular mode */
  2135.   else
  2136.   {
  2137.     if (husart->State == HAL_USART_STATE_BUSY_TX)
  2138.     {
  2139. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2140.       /* Call registered Tx Complete Callback */
  2141.       husart->TxCpltCallback(husart);
  2142. #else
  2143.       /* Call legacy weak Tx Complete Callback */
  2144.       HAL_USART_TxCpltCallback(husart);
  2145. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2146.     }
  2147.   }
  2148. }
  2149.  
  2150. /**
  2151.   * @brief  DMA USART transmit process half complete callback
  2152.   * @param  hdma Pointer to a DMA_HandleTypeDef structure that contains
  2153.   *              the configuration information for the specified DMA module.
  2154.   * @retval None
  2155.   */
  2156. static void USART_DMATxHalfCplt(DMA_HandleTypeDef *hdma)
  2157. {
  2158.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2159.  
  2160. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2161.   /* Call registered Tx Half Complete Callback */
  2162.   husart->TxHalfCpltCallback(husart);
  2163. #else
  2164.   /* Call legacy weak Tx Half Complete Callback */
  2165.   HAL_USART_TxHalfCpltCallback(husart);
  2166. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2167. }
  2168.  
  2169. /**
  2170.   * @brief  DMA USART receive process complete callback.
  2171.   * @param  hdma Pointer to a DMA_HandleTypeDef structure that contains
  2172.   *              the configuration information for the specified DMA module.
  2173.   * @retval None
  2174.   */
  2175. static void USART_DMAReceiveCplt(DMA_HandleTypeDef *hdma)
  2176. {
  2177.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2178.   /* DMA Normal mode */
  2179.   if ((hdma->Instance->CCR & DMA_CCR_CIRC) == 0U)
  2180.   {
  2181.     husart->RxXferCount = 0x00U;
  2182.  
  2183.     /* Disable RXNE, PE and ERR (Frame error, noise error, overrun error) interrupts */
  2184.     CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  2185.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  2186.  
  2187.     /* Disable the DMA transfer for the Transmit/receiver request by clearing the DMAT/DMAR bit
  2188.          in the USART CR3 register */
  2189.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAR);
  2190.     CLEAR_BIT(husart->Instance->CR3, USART_CR3_DMAT);
  2191.  
  2192.     /* The USART state is HAL_USART_STATE_BUSY_RX */
  2193.     if (husart->State == HAL_USART_STATE_BUSY_RX)
  2194.     {
  2195. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2196.       /* Call registered Rx Complete Callback */
  2197.       husart->RxCpltCallback(husart);
  2198. #else
  2199.       /* Call legacy weak Rx Complete Callback */
  2200.       HAL_USART_RxCpltCallback(husart);
  2201. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2202.     }
  2203.     /* The USART state is HAL_USART_STATE_BUSY_TX_RX */
  2204.     else
  2205.     {
  2206. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2207.       /* Call registered Tx Rx Complete Callback */
  2208.       husart->TxRxCpltCallback(husart);
  2209. #else
  2210.       /* Call legacy weak Tx Rx Complete Callback */
  2211.       HAL_USART_TxRxCpltCallback(husart);
  2212. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2213.     }
  2214.     husart->State = HAL_USART_STATE_READY;
  2215.   }
  2216.   /* DMA circular mode */
  2217.   else
  2218.   {
  2219.     if (husart->State == HAL_USART_STATE_BUSY_RX)
  2220.     {
  2221. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2222.       /* Call registered Rx Complete Callback */
  2223.       husart->RxCpltCallback(husart);
  2224. #else
  2225.       /* Call legacy weak Rx Complete Callback */
  2226.       HAL_USART_RxCpltCallback(husart);
  2227. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2228.     }
  2229.     /* The USART state is HAL_USART_STATE_BUSY_TX_RX */
  2230.     else
  2231.     {
  2232. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2233.       /* Call registered Tx Rx Complete Callback */
  2234.       husart->TxRxCpltCallback(husart);
  2235. #else
  2236.       /* Call legacy weak Tx Rx Complete Callback */
  2237.       HAL_USART_TxRxCpltCallback(husart);
  2238. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2239.     }
  2240.   }
  2241. }
  2242.  
  2243. /**
  2244.   * @brief  DMA USART receive process half complete callback
  2245.   * @param  hdma Pointer to a DMA_HandleTypeDef structure that contains
  2246.   *              the configuration information for the specified DMA module.
  2247.   * @retval None
  2248.   */
  2249. static void USART_DMARxHalfCplt(DMA_HandleTypeDef *hdma)
  2250. {
  2251.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2252.  
  2253. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2254.   /* Call registered Rx Half Complete Callback */
  2255.   husart->RxHalfCpltCallback(husart);
  2256. #else
  2257.   /* Call legacy weak Rx Half Complete Callback */
  2258.   HAL_USART_RxHalfCpltCallback(husart);
  2259. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2260. }
  2261.  
  2262. /**
  2263.   * @brief  DMA USART communication error callback.
  2264.   * @param  hdma Pointer to a DMA_HandleTypeDef structure that contains
  2265.   *              the configuration information for the specified DMA module.
  2266.   * @retval None
  2267.   */
  2268. static void USART_DMAError(DMA_HandleTypeDef *hdma)
  2269. {
  2270.   uint32_t dmarequest = 0x00U;
  2271.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2272.   husart->RxXferCount = 0x00U;
  2273.   husart->TxXferCount = 0x00U;
  2274.  
  2275.   /* Stop USART DMA Tx request if ongoing */
  2276.   dmarequest = HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAT);
  2277.   if ((husart->State == HAL_USART_STATE_BUSY_TX) && dmarequest)
  2278.   {
  2279.     USART_EndTxTransfer(husart);
  2280.   }
  2281.  
  2282.   /* Stop USART DMA Rx request if ongoing */
  2283.   dmarequest = HAL_IS_BIT_SET(husart->Instance->CR3, USART_CR3_DMAR);
  2284.   if ((husart->State == HAL_USART_STATE_BUSY_RX) && dmarequest)
  2285.   {
  2286.     USART_EndRxTransfer(husart);
  2287.   }
  2288.  
  2289.   husart->ErrorCode |= HAL_USART_ERROR_DMA;
  2290.   husart->State = HAL_USART_STATE_READY;
  2291.  
  2292. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2293.   /* Call registered Error Callback */
  2294.   husart->ErrorCallback(husart);
  2295. #else
  2296.   /* Call legacy weak Error Callback */
  2297.   HAL_USART_ErrorCallback(husart);
  2298. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2299. }
  2300.  
  2301. /**
  2302.   * @brief  This function handles USART Communication Timeout. It waits
  2303.   *         until a flag is no longer in the specified status.
  2304.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2305.   *                the configuration information for the specified USART module.
  2306.   * @param  Flag specifies the USART flag to check.
  2307.   * @param  Status The actual Flag status (SET or RESET).
  2308.   * @param  Tickstart Tick start value.
  2309.   * @param  Timeout Timeout duration.
  2310.   * @retval HAL status
  2311.   */
  2312. static HAL_StatusTypeDef USART_WaitOnFlagUntilTimeout(USART_HandleTypeDef *husart, uint32_t Flag, FlagStatus Status,
  2313.                                                       uint32_t Tickstart, uint32_t Timeout)
  2314. {
  2315.   /* Wait until flag is set */
  2316.   while ((__HAL_USART_GET_FLAG(husart, Flag) ? SET : RESET) == Status)
  2317.   {
  2318.     /* Check for the Timeout */
  2319.     if (Timeout != HAL_MAX_DELAY)
  2320.     {
  2321.       if ((Timeout == 0U) || ((HAL_GetTick() - Tickstart) > Timeout))
  2322.       {
  2323.         /* Disable the USART Transmit Complete Interrupt */
  2324.         CLEAR_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
  2325.  
  2326.         /* Disable the USART RXNE Interrupt */
  2327.         CLEAR_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);
  2328.  
  2329.         /* Disable the USART Parity Error Interrupt */
  2330.         CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  2331.  
  2332.         /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  2333.         CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  2334.  
  2335.         husart->State = HAL_USART_STATE_READY;
  2336.  
  2337.         /* Process Unlocked */
  2338.         __HAL_UNLOCK(husart);
  2339.  
  2340.         return HAL_TIMEOUT;
  2341.       }
  2342.     }
  2343.   }
  2344.   return HAL_OK;
  2345. }
  2346.  
  2347. /**
  2348.   * @brief  End ongoing Tx transfer on USART peripheral (following error detection or Transmit completion).
  2349.   * @param  husart USART handle.
  2350.   * @retval None
  2351.   */
  2352. static void USART_EndTxTransfer(USART_HandleTypeDef *husart)
  2353. {
  2354.   /* Disable TXEIE and TCIE interrupts */
  2355.   CLEAR_BIT(husart->Instance->CR1, (USART_CR1_TXEIE | USART_CR1_TCIE));
  2356.  
  2357.   /* At end of Tx process, restore husart->State to Ready */
  2358.   husart->State = HAL_USART_STATE_READY;
  2359. }
  2360.  
  2361. /**
  2362.   * @brief  End ongoing Rx transfer on USART peripheral (following error detection or Reception completion).
  2363.   * @param  husart USART handle.
  2364.   * @retval None
  2365.   */
  2366. static void USART_EndRxTransfer(USART_HandleTypeDef *husart)
  2367. {
  2368.   /* Disable RXNE, PE and ERR interrupts */
  2369.   CLEAR_BIT(husart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE));
  2370.   CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  2371.  
  2372.   /* At end of Rx process, restore husart->State to Ready */
  2373.   husart->State = HAL_USART_STATE_READY;
  2374. }
  2375.  
  2376. /**
  2377.   * @brief  DMA USART communication abort callback, when initiated by HAL services on Error
  2378.   *         (To be called at end of DMA Abort procedure following error occurrence).
  2379.   * @param  hdma DMA handle.
  2380.   * @retval None
  2381.   */
  2382. static void USART_DMAAbortOnError(DMA_HandleTypeDef *hdma)
  2383. {
  2384.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2385.   husart->RxXferCount = 0x00U;
  2386.   husart->TxXferCount = 0x00U;
  2387.  
  2388. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2389.   /* Call registered Error Callback */
  2390.   husart->ErrorCallback(husart);
  2391. #else
  2392.   /* Call legacy weak Error Callback */
  2393.   HAL_USART_ErrorCallback(husart);
  2394. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2395. }
  2396.  
  2397. /**
  2398.   * @brief  DMA USART Tx communication abort callback, when initiated by user
  2399.   *         (To be called at end of DMA Tx Abort procedure following user abort request).
  2400.   * @note   When this callback is executed, User Abort complete call back is called only if no
  2401.   *         Abort still ongoing for Rx DMA Handle.
  2402.   * @param  hdma DMA handle.
  2403.   * @retval None
  2404.   */
  2405. static void USART_DMATxAbortCallback(DMA_HandleTypeDef *hdma)
  2406. {
  2407.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2408.  
  2409.   husart->hdmatx->XferAbortCallback = NULL;
  2410.  
  2411.   /* Check if an Abort process is still ongoing */
  2412.   if (husart->hdmarx != NULL)
  2413.   {
  2414.     if (husart->hdmarx->XferAbortCallback != NULL)
  2415.     {
  2416.       return;
  2417.     }
  2418.   }
  2419.  
  2420.   /* No Abort process still ongoing : All DMA channels are aborted, call user Abort Complete callback */
  2421.   husart->TxXferCount = 0x00U;
  2422.   husart->RxXferCount = 0x00U;
  2423.  
  2424.   /* Reset errorCode */
  2425.   husart->ErrorCode = HAL_USART_ERROR_NONE;
  2426.  
  2427.   /* Restore husart->State to Ready */
  2428.   husart->State  = HAL_USART_STATE_READY;
  2429.  
  2430.   /* Call user Abort complete callback */
  2431. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2432.   /* Call registered Abort Complete Callback */
  2433.   husart->AbortCpltCallback(husart);
  2434. #else
  2435.   /* Call legacy weak Abort Complete Callback */
  2436.   HAL_USART_AbortCpltCallback(husart);
  2437. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2438. }
  2439.  
  2440. /**
  2441.   * @brief  DMA USART Rx communication abort callback, when initiated by user
  2442.   *         (To be called at end of DMA Rx Abort procedure following user abort request).
  2443.   * @note   When this callback is executed, User Abort complete call back is called only if no
  2444.   *         Abort still ongoing for Tx DMA Handle.
  2445.   * @param  hdma DMA handle.
  2446.   * @retval None
  2447.   */
  2448. static void USART_DMARxAbortCallback(DMA_HandleTypeDef *hdma)
  2449. {
  2450.   USART_HandleTypeDef *husart = (USART_HandleTypeDef *)((DMA_HandleTypeDef *)hdma)->Parent;
  2451.  
  2452.   husart->hdmarx->XferAbortCallback = NULL;
  2453.  
  2454.   /* Check if an Abort process is still ongoing */
  2455.   if (husart->hdmatx != NULL)
  2456.   {
  2457.     if (husart->hdmatx->XferAbortCallback != NULL)
  2458.     {
  2459.       return;
  2460.     }
  2461.   }
  2462.  
  2463.   /* No Abort process still ongoing : All DMA channels are aborted, call user Abort Complete callback */
  2464.   husart->TxXferCount = 0x00U;
  2465.   husart->RxXferCount = 0x00U;
  2466.  
  2467.   /* Reset errorCode */
  2468.   husart->ErrorCode = HAL_USART_ERROR_NONE;
  2469.  
  2470.   /* Restore husart->State to Ready */
  2471.   husart->State  = HAL_USART_STATE_READY;
  2472.  
  2473.   /* Call user Abort complete callback */
  2474. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2475.   /* Call registered Abort Complete Callback */
  2476.   husart->AbortCpltCallback(husart);
  2477. #else
  2478.   /* Call legacy weak Abort Complete Callback */
  2479.   HAL_USART_AbortCpltCallback(husart);
  2480. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2481. }
  2482.  
  2483. /**
  2484.   * @brief  Simplex Send an amount of data in non-blocking mode.
  2485.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2486.   *                the configuration information for the specified USART module.
  2487.   * @retval HAL status
  2488.   * @note   The USART errors are not managed to avoid the overrun error.
  2489.   */
  2490. static HAL_StatusTypeDef USART_Transmit_IT(USART_HandleTypeDef *husart)
  2491. {
  2492.   const uint16_t *tmp;
  2493.  
  2494.   if (husart->State == HAL_USART_STATE_BUSY_TX)
  2495.   {
  2496.     if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  2497.     {
  2498.       tmp = (const uint16_t *) husart->pTxBuffPtr;
  2499.       husart->Instance->DR = (uint16_t)(*tmp & (uint16_t)0x01FF);
  2500.       husart->pTxBuffPtr += 2U;
  2501.     }
  2502.     else
  2503.     {
  2504.       husart->Instance->DR = (uint8_t)(*husart->pTxBuffPtr++ & (uint8_t)0x00FF);
  2505.     }
  2506.  
  2507.     if (--husart->TxXferCount == 0U)
  2508.     {
  2509.       /* Disable the USART Transmit data register empty Interrupt */
  2510.       CLEAR_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
  2511.  
  2512.       /* Enable the USART Transmit Complete Interrupt */
  2513.       SET_BIT(husart->Instance->CR1, USART_CR1_TCIE);
  2514.     }
  2515.     return HAL_OK;
  2516.   }
  2517.   else
  2518.   {
  2519.     return HAL_BUSY;
  2520.   }
  2521. }
  2522.  
  2523. /**
  2524.   * @brief  Wraps up transmission in non blocking mode.
  2525.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2526.   *                the configuration information for the specified USART module.
  2527.   * @retval HAL status
  2528.   */
  2529. static HAL_StatusTypeDef USART_EndTransmit_IT(USART_HandleTypeDef *husart)
  2530. {
  2531.   /* Disable the USART Transmit Complete Interrupt */
  2532.   CLEAR_BIT(husart->Instance->CR1, USART_CR1_TCIE);
  2533.  
  2534.   /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  2535.   CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  2536.  
  2537.   husart->State = HAL_USART_STATE_READY;
  2538.  
  2539. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2540.   /* Call registered Tx Complete Callback */
  2541.   husart->TxCpltCallback(husart);
  2542. #else
  2543.   /* Call legacy weak Tx Complete Callback */
  2544.   HAL_USART_TxCpltCallback(husart);
  2545. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2546.  
  2547.   return HAL_OK;
  2548. }
  2549.  
  2550. /**
  2551.   * @brief  Simplex Receive an amount of data in non-blocking mode.
  2552.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2553.   *                the configuration information for the specified USART module.
  2554.   * @retval HAL status
  2555.   */
  2556. static HAL_StatusTypeDef USART_Receive_IT(USART_HandleTypeDef *husart)
  2557. {
  2558.   uint8_t  *pdata8bits;
  2559.   uint16_t *pdata16bits;
  2560.  
  2561.   if (husart->State == HAL_USART_STATE_BUSY_RX)
  2562.   {
  2563.     if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  2564.     {
  2565.       pdata8bits  = NULL;
  2566.       pdata16bits = (uint16_t *) husart->pRxBuffPtr;
  2567.       *pdata16bits = (uint16_t)(husart->Instance->DR & (uint16_t)0x01FF);
  2568.       husart->pRxBuffPtr += 2U;
  2569.     }
  2570.     else
  2571.     {
  2572.       pdata8bits = (uint8_t *) husart->pRxBuffPtr;
  2573.       pdata16bits  = NULL;
  2574.  
  2575.       if ((husart->Init.WordLength == USART_WORDLENGTH_9B) || ((husart->Init.WordLength == USART_WORDLENGTH_8B) && (husart->Init.Parity == USART_PARITY_NONE)))
  2576.       {
  2577.         *pdata8bits = (uint8_t)(husart->Instance->DR & (uint8_t)0x00FF);
  2578.       }
  2579.       else
  2580.       {
  2581.         *pdata8bits = (uint8_t)(husart->Instance->DR & (uint8_t)0x007F);
  2582.       }
  2583.  
  2584.       husart->pRxBuffPtr += 1U;
  2585.     }
  2586.  
  2587.     husart->RxXferCount--;
  2588.  
  2589.     if (husart->RxXferCount == 0U)
  2590.     {
  2591.       /* Disable the USART RXNE Interrupt */
  2592.       CLEAR_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);
  2593.  
  2594.       /* Disable the USART Parity Error Interrupt */
  2595.       CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  2596.  
  2597.       /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  2598.       CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  2599.  
  2600.       husart->State = HAL_USART_STATE_READY;
  2601. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2602.       /* Call registered Rx Complete Callback */
  2603.       husart->RxCpltCallback(husart);
  2604. #else
  2605.       /* Call legacy weak Rx Complete Callback */
  2606.       HAL_USART_RxCpltCallback(husart);
  2607. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2608.  
  2609.       return HAL_OK;
  2610.     }
  2611.     else
  2612.     {
  2613.       /* Send dummy byte in order to generate the clock for the slave to send the next data.
  2614.       * Whatever the frame length (7, 8 or 9-bit long), the same dummy value
  2615.       * can be written for all the cases. */
  2616.       husart->Instance->DR = (DUMMY_DATA & (uint16_t)0x0FF);
  2617.     }
  2618.     return HAL_OK;
  2619.   }
  2620.   else
  2621.   {
  2622.     return HAL_BUSY;
  2623.   }
  2624. }
  2625.  
  2626. /**
  2627.   * @brief  Full-Duplex Send receive an amount of data in full-duplex mode (non-blocking).
  2628.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2629.   *                the configuration information for the specified USART module.
  2630.   * @retval HAL status
  2631.   */
  2632. static HAL_StatusTypeDef USART_TransmitReceive_IT(USART_HandleTypeDef *husart)
  2633. {
  2634.   const uint16_t *pdatatx16bits;
  2635.   uint16_t *pdatarx16bits;
  2636.  
  2637.   if (husart->State == HAL_USART_STATE_BUSY_TX_RX)
  2638.   {
  2639.     if (husart->TxXferCount != 0x00U)
  2640.     {
  2641.       if (__HAL_USART_GET_FLAG(husart, USART_FLAG_TXE) != RESET)
  2642.       {
  2643.         if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  2644.         {
  2645.           pdatatx16bits = (const uint16_t *) husart->pTxBuffPtr;
  2646.           husart->Instance->DR = (uint16_t)(*pdatatx16bits & (uint16_t)0x01FF);
  2647.           husart->pTxBuffPtr += 2U;
  2648.         }
  2649.         else
  2650.         {
  2651.           husart->Instance->DR = (uint8_t)(*husart->pTxBuffPtr++ & (uint8_t)0x00FF);
  2652.         }
  2653.  
  2654.         husart->TxXferCount--;
  2655.  
  2656.         /* Check the latest data transmitted */
  2657.         if (husart->TxXferCount == 0U)
  2658.         {
  2659.           CLEAR_BIT(husart->Instance->CR1, USART_CR1_TXEIE);
  2660.         }
  2661.       }
  2662.     }
  2663.  
  2664.     if (husart->RxXferCount != 0x00U)
  2665.     {
  2666.       if (__HAL_USART_GET_FLAG(husart, USART_FLAG_RXNE) != RESET)
  2667.       {
  2668.         if ((husart->Init.WordLength == USART_WORDLENGTH_9B) && (husart->Init.Parity == USART_PARITY_NONE))
  2669.         {
  2670.           pdatarx16bits = (uint16_t *) husart->pRxBuffPtr;
  2671.           *pdatarx16bits = (uint16_t)(husart->Instance->DR & (uint16_t)0x01FF);
  2672.           husart->pRxBuffPtr += 2U;
  2673.         }
  2674.         else
  2675.         {
  2676.           if ((husart->Init.WordLength == USART_WORDLENGTH_9B) || ((husart->Init.WordLength == USART_WORDLENGTH_8B) && (husart->Init.Parity == USART_PARITY_NONE)))
  2677.           {
  2678.             *husart->pRxBuffPtr = (uint8_t)(husart->Instance->DR & (uint8_t)0x00FF);
  2679.           }
  2680.           else
  2681.           {
  2682.             *husart->pRxBuffPtr = (uint8_t)(husart->Instance->DR & (uint8_t)0x007F);
  2683.           }
  2684.           husart->pRxBuffPtr += 1U;
  2685.         }
  2686.  
  2687.         husart->RxXferCount--;
  2688.       }
  2689.     }
  2690.  
  2691.     /* Check the latest data received */
  2692.     if (husart->RxXferCount == 0U)
  2693.     {
  2694.       /* Disable the USART RXNE Interrupt */
  2695.       CLEAR_BIT(husart->Instance->CR1, USART_CR1_RXNEIE);
  2696.  
  2697.       /* Disable the USART Parity Error Interrupt */
  2698.       CLEAR_BIT(husart->Instance->CR1, USART_CR1_PEIE);
  2699.  
  2700.       /* Disable the USART Error Interrupt: (Frame error, noise error, overrun error) */
  2701.       CLEAR_BIT(husart->Instance->CR3, USART_CR3_EIE);
  2702.  
  2703.       husart->State = HAL_USART_STATE_READY;
  2704.  
  2705. #if (USE_HAL_USART_REGISTER_CALLBACKS == 1)
  2706.       /* Call registered Tx Rx Complete Callback */
  2707.       husart->TxRxCpltCallback(husart);
  2708. #else
  2709.       /* Call legacy weak Tx Rx Complete Callback */
  2710.       HAL_USART_TxRxCpltCallback(husart);
  2711. #endif /* USE_HAL_USART_REGISTER_CALLBACKS */
  2712.  
  2713.       return HAL_OK;
  2714.     }
  2715.  
  2716.     return HAL_OK;
  2717.   }
  2718.   else
  2719.   {
  2720.     return HAL_BUSY;
  2721.   }
  2722. }
  2723.  
  2724. /**
  2725.   * @brief  Configures the USART peripheral.
  2726.   * @param  husart Pointer to a USART_HandleTypeDef structure that contains
  2727.   *                the configuration information for the specified USART module.
  2728.   * @retval None
  2729.   */
  2730. static void USART_SetConfig(USART_HandleTypeDef *husart)
  2731. {
  2732.   uint32_t tmpreg = 0x00U;
  2733.   uint32_t pclk;
  2734.  
  2735.   /* Check the parameters */
  2736.   assert_param(IS_USART_INSTANCE(husart->Instance));
  2737.   assert_param(IS_USART_POLARITY(husart->Init.CLKPolarity));
  2738.   assert_param(IS_USART_PHASE(husart->Init.CLKPhase));
  2739.   assert_param(IS_USART_LASTBIT(husart->Init.CLKLastBit));
  2740.   assert_param(IS_USART_BAUDRATE(husart->Init.BaudRate));
  2741.   assert_param(IS_USART_WORD_LENGTH(husart->Init.WordLength));
  2742.   assert_param(IS_USART_STOPBITS(husart->Init.StopBits));
  2743.   assert_param(IS_USART_PARITY(husart->Init.Parity));
  2744.   assert_param(IS_USART_MODE(husart->Init.Mode));
  2745.  
  2746.   /* The LBCL, CPOL and CPHA bits have to be selected when both the transmitter and the
  2747.      receiver are disabled (TE=RE=0) to ensure that the clock pulses function correctly. */
  2748.   CLEAR_BIT(husart->Instance->CR1, (USART_CR1_TE | USART_CR1_RE));
  2749.  
  2750.   /*---------------------------- USART CR2 Configuration ---------------------*/
  2751.   tmpreg = husart->Instance->CR2;
  2752.   /* Clear CLKEN, CPOL, CPHA and LBCL bits */
  2753.   tmpreg &= (uint32_t)~((uint32_t)(USART_CR2_CPHA | USART_CR2_CPOL | USART_CR2_CLKEN | USART_CR2_LBCL | USART_CR2_STOP));
  2754.   /* Configure the USART Clock, CPOL, CPHA and LastBit -----------------------*/
  2755.   /* Set CPOL bit according to husart->Init.CLKPolarity value */
  2756.   /* Set CPHA bit according to husart->Init.CLKPhase value */
  2757.   /* Set LBCL bit according to husart->Init.CLKLastBit value */
  2758.   /* Set Stop Bits: Set STOP[13:12] bits according to husart->Init.StopBits value */
  2759.   tmpreg |= (uint32_t)(USART_CLOCK_ENABLE | husart->Init.CLKPolarity |
  2760.                        husart->Init.CLKPhase | husart->Init.CLKLastBit | husart->Init.StopBits);
  2761.   /* Write to USART CR2 */
  2762.   WRITE_REG(husart->Instance->CR2, (uint32_t)tmpreg);
  2763.  
  2764.   /*-------------------------- USART CR1 Configuration -----------------------*/
  2765.   tmpreg = husart->Instance->CR1;
  2766.  
  2767.   /* Clear M, PCE, PS, TE and RE bits */
  2768.   tmpreg &= (uint32_t)~((uint32_t)(USART_CR1_M | USART_CR1_PCE | USART_CR1_PS | USART_CR1_TE | USART_CR1_RE));
  2769.  
  2770.   /* Configure the USART Word Length, Parity and mode:
  2771.      Set the M bits according to husart->Init.WordLength value
  2772.      Set PCE and PS bits according to husart->Init.Parity value
  2773.      Set TE and RE bits according to husart->Init.Mode value
  2774.    */
  2775.   tmpreg |= (uint32_t)husart->Init.WordLength | husart->Init.Parity | husart->Init.Mode;
  2776.  
  2777.   /* Write to USART CR1 */
  2778.   WRITE_REG(husart->Instance->CR1, (uint32_t)tmpreg);
  2779.  
  2780.   /*-------------------------- USART CR3 Configuration -----------------------*/
  2781.   /* Clear CTSE and RTSE bits */
  2782.   CLEAR_BIT(husart->Instance->CR3, (USART_CR3_RTSE | USART_CR3_CTSE));
  2783.  
  2784.   /*-------------------------- USART BRR Configuration -----------------------*/
  2785.   if((husart->Instance == USART1))
  2786.   {
  2787.     pclk = HAL_RCC_GetPCLK2Freq();
  2788.     husart->Instance->BRR = USART_BRR(pclk, husart->Init.BaudRate);
  2789.   }
  2790.   else
  2791.   {
  2792.     pclk = HAL_RCC_GetPCLK1Freq();
  2793.     husart->Instance->BRR = USART_BRR(pclk, husart->Init.BaudRate);
  2794.   }
  2795. }
  2796.  
  2797. /**
  2798.   * @}
  2799.   */
  2800.  
  2801. /**
  2802.   * @}
  2803.   */
  2804.  
  2805. #endif /* HAL_USART_MODULE_ENABLED */
  2806. /**
  2807.   * @}
  2808.   */
  2809.  
  2810. /**
  2811.   * @}
  2812.   */
  2813.  
  2814.