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  1. /**
  2.   ******************************************************************************
  3.   * @file    stm32f0xx_ll_usart.c
  4.   * @author  MCD Application Team
  5.   * @brief   USART LL module driver.
  6.   ******************************************************************************
  7.   * @attention
  8.   *
  9.   * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  10.   * All rights reserved.</center></h2>
  11.   *
  12.   * This software component is licensed by ST under BSD 3-Clause license,
  13.   * the "License"; You may not use this file except in compliance with the
  14.   * License. You may obtain a copy of the License at:
  15.   *                        opensource.org/licenses/BSD-3-Clause
  16.   *
  17.   ******************************************************************************
  18.   */
  19. #if defined(USE_FULL_LL_DRIVER)
  20.  
  21. /* Includes ------------------------------------------------------------------*/
  22. #include "stm32f0xx_ll_usart.h"
  23. #include "stm32f0xx_ll_rcc.h"
  24. #include "stm32f0xx_ll_bus.h"
  25. #ifdef USE_FULL_ASSERT
  26. #include "stm32_assert.h"
  27. #else
  28. #define assert_param(expr) ((void)0U)
  29. #endif /* USE_FULL_ASSERT */
  30.  
  31. /** @addtogroup STM32F0xx_LL_Driver
  32.   * @{
  33.   */
  34.  
  35. #if defined (USART1) || defined (USART2) || defined (USART3) || defined (UART4) || defined (UART5) || defined (USART6) || defined (USART7) || defined (USART8)
  36.  
  37. /** @addtogroup USART_LL
  38.   * @{
  39.   */
  40.  
  41. /* Private types -------------------------------------------------------------*/
  42. /* Private variables ---------------------------------------------------------*/
  43. /* Private constants ---------------------------------------------------------*/
  44. /* Private macros ------------------------------------------------------------*/
  45. /** @addtogroup USART_LL_Private_Macros
  46.   * @{
  47.   */
  48.  
  49. /* __BAUDRATE__ The maximum Baud Rate is derived from the maximum clock available
  50.  *              divided by the smallest oversampling used on the USART (i.e. 8)    */
  51. #define IS_LL_USART_BAUDRATE(__BAUDRATE__) ((__BAUDRATE__) <= 6000000U)
  52.  
  53. /* __VALUE__ In case of oversampling by 16 and 8, BRR content must be greater than or equal to 16d. */
  54. #define IS_LL_USART_BRR_MIN(__VALUE__) ((__VALUE__) >= 16U)
  55.  
  56. #define IS_LL_USART_DIRECTION(__VALUE__) (((__VALUE__) == LL_USART_DIRECTION_NONE) \
  57.                                           || ((__VALUE__) == LL_USART_DIRECTION_RX) \
  58.                                           || ((__VALUE__) == LL_USART_DIRECTION_TX) \
  59.                                           || ((__VALUE__) == LL_USART_DIRECTION_TX_RX))
  60.  
  61. #define IS_LL_USART_PARITY(__VALUE__) (((__VALUE__) == LL_USART_PARITY_NONE) \
  62.                                        || ((__VALUE__) == LL_USART_PARITY_EVEN) \
  63.                                        || ((__VALUE__) == LL_USART_PARITY_ODD))
  64.  
  65. #if defined(USART_7BITS_SUPPORT)
  66. #define IS_LL_USART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_USART_DATAWIDTH_7B) \
  67.                                           || ((__VALUE__) == LL_USART_DATAWIDTH_8B) \
  68.                                           || ((__VALUE__) == LL_USART_DATAWIDTH_9B))
  69. #else
  70. #define IS_LL_USART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_USART_DATAWIDTH_8B) \
  71.                                           || ((__VALUE__) == LL_USART_DATAWIDTH_9B))
  72. #endif /* USART_7BITS_SUPPORT */
  73.  
  74. #define IS_LL_USART_OVERSAMPLING(__VALUE__) (((__VALUE__) == LL_USART_OVERSAMPLING_16) \
  75.                                              || ((__VALUE__) == LL_USART_OVERSAMPLING_8))
  76.  
  77. #define IS_LL_USART_LASTBITCLKOUTPUT(__VALUE__) (((__VALUE__) == LL_USART_LASTCLKPULSE_NO_OUTPUT) \
  78.                                                  || ((__VALUE__) == LL_USART_LASTCLKPULSE_OUTPUT))
  79.  
  80. #define IS_LL_USART_CLOCKPHASE(__VALUE__) (((__VALUE__) == LL_USART_PHASE_1EDGE) \
  81.                                            || ((__VALUE__) == LL_USART_PHASE_2EDGE))
  82.  
  83. #define IS_LL_USART_CLOCKPOLARITY(__VALUE__) (((__VALUE__) == LL_USART_POLARITY_LOW) \
  84.                                               || ((__VALUE__) == LL_USART_POLARITY_HIGH))
  85.  
  86. #define IS_LL_USART_CLOCKOUTPUT(__VALUE__) (((__VALUE__) == LL_USART_CLOCK_DISABLE) \
  87.                                             || ((__VALUE__) == LL_USART_CLOCK_ENABLE))
  88.  
  89. #if defined(USART_SMARTCARD_SUPPORT)
  90. #define IS_LL_USART_STOPBITS(__VALUE__) (((__VALUE__) == LL_USART_STOPBITS_0_5) \
  91.                                          || ((__VALUE__) == LL_USART_STOPBITS_1) \
  92.                                          || ((__VALUE__) == LL_USART_STOPBITS_1_5) \
  93.                                          || ((__VALUE__) == LL_USART_STOPBITS_2))
  94. #else
  95. #define IS_LL_USART_STOPBITS(__VALUE__) (((__VALUE__) == LL_USART_STOPBITS_1) \
  96.                                          || ((__VALUE__) == LL_USART_STOPBITS_2))
  97. #endif
  98.  
  99. #define IS_LL_USART_HWCONTROL(__VALUE__) (((__VALUE__) == LL_USART_HWCONTROL_NONE) \
  100.                                           || ((__VALUE__) == LL_USART_HWCONTROL_RTS) \
  101.                                           || ((__VALUE__) == LL_USART_HWCONTROL_CTS) \
  102.                                           || ((__VALUE__) == LL_USART_HWCONTROL_RTS_CTS))
  103.  
  104. /**
  105.   * @}
  106.   */
  107.  
  108. /* Private function prototypes -----------------------------------------------*/
  109.  
  110. /* Exported functions --------------------------------------------------------*/
  111. /** @addtogroup USART_LL_Exported_Functions
  112.   * @{
  113.   */
  114.  
  115. /** @addtogroup USART_LL_EF_Init
  116.   * @{
  117.   */
  118.  
  119. /**
  120.   * @brief  De-initialize USART registers (Registers restored to their default values).
  121.   * @param  USARTx USART Instance
  122.   * @retval An ErrorStatus enumeration value:
  123.   *          - SUCCESS: USART registers are de-initialized
  124.   *          - ERROR: USART registers are not de-initialized
  125.   */
  126. ErrorStatus LL_USART_DeInit(USART_TypeDef *USARTx)
  127. {
  128.   ErrorStatus status = SUCCESS;
  129.  
  130.   /* Check the parameters */
  131.   assert_param(IS_UART_INSTANCE(USARTx));
  132.  
  133.   if (USARTx == USART1)
  134.   {
  135.     /* Force reset of USART clock */
  136.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART1);
  137.  
  138.     /* Release reset of USART clock */
  139.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART1);
  140.   }
  141. #if defined(USART2)
  142.   else if (USARTx == USART2)
  143.   {
  144.     /* Force reset of USART clock */
  145.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART2);
  146.  
  147.     /* Release reset of USART clock */
  148.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART2);
  149.   }
  150. #endif /* USART2 */
  151. #if defined(USART3)
  152.   else if (USARTx == USART3)
  153.   {
  154.     /* Force reset of USART clock */
  155.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART3);
  156.  
  157.     /* Release reset of USART clock */
  158.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART3);
  159.   }
  160. #endif /* USART3 */
  161. #if defined(USART4)
  162.   else if (USARTx == USART4)
  163.   {
  164.     /* Force reset of USART clock */
  165.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART4);
  166.  
  167.     /* Release reset of USART clock */
  168.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART4);
  169.   }
  170. #endif /* USART4 */
  171. #if defined(USART5)
  172.   else if (USARTx == USART5)
  173.   {
  174.     /* Force reset of USART clock */
  175.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART5);
  176.  
  177.     /* Release reset of USART clock */
  178.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART5);
  179.   }
  180. #endif /* USART5 */
  181. #if defined(USART6)
  182.   else if (USARTx == USART6)
  183.   {
  184.     /* Force reset of USART clock */
  185.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART6);
  186.  
  187.     /* Release reset of USART clock */
  188.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART6);
  189.   }
  190. #endif /* USART6 */
  191. #if defined(USART7)
  192.   else if (USARTx == USART7)
  193.   {
  194.     /* Force reset of USART clock */
  195.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART7);
  196.  
  197.     /* Release reset of USART clock */
  198.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART7);
  199.   }
  200. #endif /* USART7 */
  201. #if defined(USART8)
  202.   else if (USARTx == USART8)
  203.   {
  204.     /* Force reset of USART clock */
  205.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART8);
  206.  
  207.     /* Release reset of USART clock */
  208.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART8);
  209.   }
  210. #endif /* USART8 */
  211.   else
  212.   {
  213.     status = ERROR;
  214.   }
  215.  
  216.   return (status);
  217. }
  218.  
  219. /**
  220.   * @brief  Initialize USART registers according to the specified
  221.   *         parameters in USART_InitStruct.
  222.   * @note   As some bits in USART configuration registers can only be written when
  223.   *         the USART is disabled (USART_CR1_UE bit =0), USART Peripheral should be in disabled state prior calling
  224.   *         this function. Otherwise, ERROR result will be returned.
  225.   * @note   Baud rate value stored in USART_InitStruct BaudRate field, should be valid (different from 0).
  226.   * @param  USARTx USART Instance
  227.   * @param  USART_InitStruct pointer to a LL_USART_InitTypeDef structure
  228.   *         that contains the configuration information for the specified USART peripheral.
  229.   * @retval An ErrorStatus enumeration value:
  230.   *          - SUCCESS: USART registers are initialized according to USART_InitStruct content
  231.   *          - ERROR: Problem occurred during USART Registers initialization
  232.   */
  233. ErrorStatus LL_USART_Init(USART_TypeDef *USARTx, LL_USART_InitTypeDef *USART_InitStruct)
  234. {
  235.   ErrorStatus status = ERROR;
  236.   uint32_t periphclk = LL_RCC_PERIPH_FREQUENCY_NO;
  237. #if defined(USART2)||defined(USART3)||defined(USART4)
  238.   LL_RCC_ClocksTypeDef RCC_Clocks;
  239. #endif /* USART2 ||USART3 || USART4 */
  240.  
  241.   /* Check the parameters */
  242.   assert_param(IS_UART_INSTANCE(USARTx));
  243.   assert_param(IS_LL_USART_BAUDRATE(USART_InitStruct->BaudRate));
  244.   assert_param(IS_LL_USART_DATAWIDTH(USART_InitStruct->DataWidth));
  245.   assert_param(IS_LL_USART_STOPBITS(USART_InitStruct->StopBits));
  246.   assert_param(IS_LL_USART_PARITY(USART_InitStruct->Parity));
  247.   assert_param(IS_LL_USART_DIRECTION(USART_InitStruct->TransferDirection));
  248.   assert_param(IS_LL_USART_HWCONTROL(USART_InitStruct->HardwareFlowControl));
  249.   assert_param(IS_LL_USART_OVERSAMPLING(USART_InitStruct->OverSampling));
  250.  
  251.   /* USART needs to be in disabled state, in order to be able to configure some bits in
  252.      CRx registers */
  253.   if (LL_USART_IsEnabled(USARTx) == 0U)
  254.   {
  255.     /*---------------------------- USART CR1 Configuration ---------------------
  256.      * Configure USARTx CR1 (USART Word Length, Parity, Mode and Oversampling bits) with parameters:
  257.      * - DataWidth:          USART_CR1_M bits according to USART_InitStruct->DataWidth value
  258.      * - Parity:             USART_CR1_PCE, USART_CR1_PS bits according to USART_InitStruct->Parity value
  259.      * - TransferDirection:  USART_CR1_TE, USART_CR1_RE bits according to USART_InitStruct->TransferDirection value
  260.      * - Oversampling:       USART_CR1_OVER8 bit according to USART_InitStruct->OverSampling value.
  261.      */
  262.     MODIFY_REG(USARTx->CR1,
  263.                (USART_CR1_M | USART_CR1_PCE | USART_CR1_PS |
  264.                 USART_CR1_TE | USART_CR1_RE | USART_CR1_OVER8),
  265.                (USART_InitStruct->DataWidth | USART_InitStruct->Parity |
  266.                 USART_InitStruct->TransferDirection | USART_InitStruct->OverSampling));
  267.  
  268.     /*---------------------------- USART CR2 Configuration ---------------------
  269.      * Configure USARTx CR2 (Stop bits) with parameters:
  270.      * - Stop Bits:          USART_CR2_STOP bits according to USART_InitStruct->StopBits value.
  271.      * - CLKEN, CPOL, CPHA and LBCL bits are to be configured using LL_USART_ClockInit().
  272.      */
  273.     LL_USART_SetStopBitsLength(USARTx, USART_InitStruct->StopBits);
  274.  
  275.     /*---------------------------- USART CR3 Configuration ---------------------
  276.      * Configure USARTx CR3 (Hardware Flow Control) with parameters:
  277.      * - HardwareFlowControl: USART_CR3_RTSE, USART_CR3_CTSE bits according to
  278.      *   USART_InitStruct->HardwareFlowControl value.
  279.      */
  280.     LL_USART_SetHWFlowCtrl(USARTx, USART_InitStruct->HardwareFlowControl);
  281.  
  282.     /*---------------------------- USART BRR Configuration ---------------------
  283.      * Retrieve Clock frequency used for USART Peripheral
  284.      */
  285.     if (USARTx == USART1)
  286.     {
  287.       periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART1_CLKSOURCE);
  288.     }
  289. #if defined(USART2)
  290.     else if (USARTx == USART2)
  291.     {
  292. #if defined(RCC_CFGR3_USART2SW)
  293.       periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART2_CLKSOURCE);
  294. #else
  295.       /* USART2 clock is PCLK */
  296.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  297.       periphclk = RCC_Clocks.PCLK1_Frequency;
  298. #endif
  299.     }
  300. #endif /* USART2 */
  301. #if defined(USART3)
  302.     else if (USARTx == USART3)
  303.     {
  304. #if defined(RCC_CFGR3_USART3SW)
  305.       periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART3_CLKSOURCE);
  306. #else
  307.       /* USART3 clock is PCLK */
  308.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  309.       periphclk = RCC_Clocks.PCLK1_Frequency;
  310. #endif
  311.     }
  312. #endif /* USART3 */
  313. #if defined(USART4)
  314.     else if (USARTx == USART4)
  315.     {
  316.       /* USART4 clock is PCLK1 */
  317.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  318.       periphclk = RCC_Clocks.PCLK1_Frequency;
  319.     }
  320. #endif /* USART4 */
  321. #if defined(USART5)
  322.     else if (USARTx == USART5)
  323.     {
  324.       /* USART5 clock is PCLK1 */
  325.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  326.       periphclk = RCC_Clocks.PCLK1_Frequency;
  327.     }
  328. #endif /* USART5 */
  329. #if defined(USART6)
  330.     else if (USARTx == USART6)
  331.     {
  332.       /* USART6 clock is PCLK1 */
  333.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  334.       periphclk = RCC_Clocks.PCLK1_Frequency;
  335.     }
  336. #endif /* USART6 */
  337. #if defined(USART7)
  338.     else if (USARTx == USART7)
  339.     {
  340.       /* USART7 clock is PCLK */
  341.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  342.       periphclk = RCC_Clocks.PCLK1_Frequency;
  343.     }
  344. #endif /* USART7 */
  345. #if defined(USART8)
  346.     else if (USARTx == USART8)
  347.     {
  348.       /* USART8 clock is PCLK */
  349.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  350.       periphclk = RCC_Clocks.PCLK1_Frequency;
  351.     }
  352. #endif /* USART8 */
  353.     else
  354.     {
  355.       /* Nothing to do, as error code is already assigned to ERROR value */
  356.     }
  357.  
  358.     /* Configure the USART Baud Rate :
  359.        - valid baud rate value (different from 0) is required
  360.        - Peripheral clock as returned by RCC service, should be valid (different from 0).
  361.     */
  362.     if ((periphclk != LL_RCC_PERIPH_FREQUENCY_NO)
  363.         && (USART_InitStruct->BaudRate != 0U))
  364.     {
  365.       status = SUCCESS;
  366.       LL_USART_SetBaudRate(USARTx,
  367.                            periphclk,
  368.                            USART_InitStruct->OverSampling,
  369.                            USART_InitStruct->BaudRate);
  370.  
  371.       /* Check BRR is greater than or equal to 16d */
  372.       assert_param(IS_LL_USART_BRR_MIN(USARTx->BRR));
  373.     }
  374.   }
  375.   /* Endif (=> USART not in Disabled state => return ERROR) */
  376.  
  377.   return (status);
  378. }
  379.  
  380. /**
  381.   * @brief Set each @ref LL_USART_InitTypeDef field to default value.
  382.   * @param USART_InitStruct pointer to a @ref LL_USART_InitTypeDef structure
  383.   *                         whose fields will be set to default values.
  384.   * @retval None
  385.   */
  386.  
  387. void LL_USART_StructInit(LL_USART_InitTypeDef *USART_InitStruct)
  388. {
  389.   /* Set USART_InitStruct fields to default values */
  390.   USART_InitStruct->BaudRate            = 9600U;
  391.   USART_InitStruct->DataWidth           = LL_USART_DATAWIDTH_8B;
  392.   USART_InitStruct->StopBits            = LL_USART_STOPBITS_1;
  393.   USART_InitStruct->Parity              = LL_USART_PARITY_NONE ;
  394.   USART_InitStruct->TransferDirection   = LL_USART_DIRECTION_TX_RX;
  395.   USART_InitStruct->HardwareFlowControl = LL_USART_HWCONTROL_NONE;
  396.   USART_InitStruct->OverSampling        = LL_USART_OVERSAMPLING_16;
  397. }
  398.  
  399. /**
  400.   * @brief  Initialize USART Clock related settings according to the
  401.   *         specified parameters in the USART_ClockInitStruct.
  402.   * @note   As some bits in USART configuration registers can only be written when
  403.   *         the USART is disabled (USART_CR1_UE bit =0), USART Peripheral should be in disabled state prior calling
  404.   *         this function. Otherwise, ERROR result will be returned.
  405.   * @param  USARTx USART Instance
  406.   * @param  USART_ClockInitStruct pointer to a @ref LL_USART_ClockInitTypeDef structure
  407.   *         that contains the Clock configuration information for the specified USART peripheral.
  408.   * @retval An ErrorStatus enumeration value:
  409.   *          - SUCCESS: USART registers related to Clock settings are initialized according
  410.   *                     to USART_ClockInitStruct content
  411.   *          - ERROR: Problem occurred during USART Registers initialization
  412.   */
  413. ErrorStatus LL_USART_ClockInit(USART_TypeDef *USARTx, LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
  414. {
  415.   ErrorStatus status = SUCCESS;
  416.  
  417.   /* Check USART Instance and Clock signal output parameters */
  418.   assert_param(IS_UART_INSTANCE(USARTx));
  419.   assert_param(IS_LL_USART_CLOCKOUTPUT(USART_ClockInitStruct->ClockOutput));
  420.  
  421.   /* USART needs to be in disabled state, in order to be able to configure some bits in
  422.      CRx registers */
  423.   if (LL_USART_IsEnabled(USARTx) == 0U)
  424.   {
  425.     /* If USART Clock signal is disabled */
  426.     if (USART_ClockInitStruct->ClockOutput == LL_USART_CLOCK_DISABLE)
  427.     {
  428.       /* Deactivate Clock signal delivery :
  429.        * - Disable Clock Output:        USART_CR2_CLKEN cleared
  430.        */
  431.       LL_USART_DisableSCLKOutput(USARTx);
  432.     }
  433.     else
  434.     {
  435.       /* Ensure USART instance is USART capable */
  436.       assert_param(IS_USART_INSTANCE(USARTx));
  437.  
  438.       /* Check clock related parameters */
  439.       assert_param(IS_LL_USART_CLOCKPOLARITY(USART_ClockInitStruct->ClockPolarity));
  440.       assert_param(IS_LL_USART_CLOCKPHASE(USART_ClockInitStruct->ClockPhase));
  441.       assert_param(IS_LL_USART_LASTBITCLKOUTPUT(USART_ClockInitStruct->LastBitClockPulse));
  442.  
  443.       /*---------------------------- USART CR2 Configuration -----------------------
  444.        * Configure USARTx CR2 (Clock signal related bits) with parameters:
  445.        * - Enable Clock Output:         USART_CR2_CLKEN set
  446.        * - Clock Polarity:              USART_CR2_CPOL bit according to USART_ClockInitStruct->ClockPolarity value
  447.        * - Clock Phase:                 USART_CR2_CPHA bit according to USART_ClockInitStruct->ClockPhase value
  448.        * - Last Bit Clock Pulse Output: USART_CR2_LBCL bit according to USART_ClockInitStruct->LastBitClockPulse value.
  449.        */
  450.       MODIFY_REG(USARTx->CR2,
  451.                  USART_CR2_CLKEN | USART_CR2_CPHA | USART_CR2_CPOL | USART_CR2_LBCL,
  452.                  USART_CR2_CLKEN | USART_ClockInitStruct->ClockPolarity |
  453.                  USART_ClockInitStruct->ClockPhase | USART_ClockInitStruct->LastBitClockPulse);
  454.     }
  455.   }
  456.   /* Else (USART not in Disabled state => return ERROR */
  457.   else
  458.   {
  459.     status = ERROR;
  460.   }
  461.  
  462.   return (status);
  463. }
  464.  
  465. /**
  466.   * @brief Set each field of a @ref LL_USART_ClockInitTypeDef type structure to default value.
  467.   * @param USART_ClockInitStruct pointer to a @ref LL_USART_ClockInitTypeDef structure
  468.   *                              whose fields will be set to default values.
  469.   * @retval None
  470.   */
  471. void LL_USART_ClockStructInit(LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
  472. {
  473.   /* Set LL_USART_ClockInitStruct fields with default values */
  474.   USART_ClockInitStruct->ClockOutput       = LL_USART_CLOCK_DISABLE;
  475.   USART_ClockInitStruct->ClockPolarity     = LL_USART_POLARITY_LOW;            /* Not relevant when ClockOutput =
  476.                                                                                   LL_USART_CLOCK_DISABLE */
  477.   USART_ClockInitStruct->ClockPhase        = LL_USART_PHASE_1EDGE;             /* Not relevant when ClockOutput =
  478.                                                                                   LL_USART_CLOCK_DISABLE */
  479.   USART_ClockInitStruct->LastBitClockPulse = LL_USART_LASTCLKPULSE_NO_OUTPUT;  /* Not relevant when ClockOutput =
  480.                                                                                   LL_USART_CLOCK_DISABLE */
  481. }
  482.  
  483. /**
  484.   * @}
  485.   */
  486.  
  487. /**
  488.   * @}
  489.   */
  490.  
  491. /**
  492.   * @}
  493.   */
  494.  
  495. #endif /* USART1 || USART2 || USART3 || UART4 || UART5 || USART6 || USART7 || USART8 */
  496.  
  497. /**
  498.   * @}
  499.   */
  500.  
  501. #endif /* USE_FULL_LL_DRIVER */
  502.  
  503. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  504.  
  505.