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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. /* __VALUE__ BRR content must be lower than or equal to 0xFFFF. */
  57. #define IS_LL_USART_BRR_MAX(__VALUE__) ((__VALUE__) <= 0x0000FFFFU)
  58.  
  59. #define IS_LL_USART_DIRECTION(__VALUE__) (((__VALUE__) == LL_USART_DIRECTION_NONE) \
  60.                                           || ((__VALUE__) == LL_USART_DIRECTION_RX) \
  61.                                           || ((__VALUE__) == LL_USART_DIRECTION_TX) \
  62.                                           || ((__VALUE__) == LL_USART_DIRECTION_TX_RX))
  63.  
  64. #define IS_LL_USART_PARITY(__VALUE__) (((__VALUE__) == LL_USART_PARITY_NONE) \
  65.                                        || ((__VALUE__) == LL_USART_PARITY_EVEN) \
  66.                                        || ((__VALUE__) == LL_USART_PARITY_ODD))
  67.  
  68. #if defined(USART_7BITS_SUPPORT)
  69. #define IS_LL_USART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_USART_DATAWIDTH_7B) \
  70.                                           || ((__VALUE__) == LL_USART_DATAWIDTH_8B) \
  71.                                           || ((__VALUE__) == LL_USART_DATAWIDTH_9B))
  72. #else
  73. #define IS_LL_USART_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_USART_DATAWIDTH_8B) \
  74.                                        || ((__VALUE__) == LL_USART_DATAWIDTH_9B))
  75. #endif /* USART_7BITS_SUPPORT */
  76.  
  77. #define IS_LL_USART_OVERSAMPLING(__VALUE__) (((__VALUE__) == LL_USART_OVERSAMPLING_16) \
  78.                                              || ((__VALUE__) == LL_USART_OVERSAMPLING_8))
  79.  
  80. #define IS_LL_USART_LASTBITCLKOUTPUT(__VALUE__) (((__VALUE__) == LL_USART_LASTCLKPULSE_NO_OUTPUT) \
  81.                                                  || ((__VALUE__) == LL_USART_LASTCLKPULSE_OUTPUT))
  82.  
  83. #define IS_LL_USART_CLOCKPHASE(__VALUE__) (((__VALUE__) == LL_USART_PHASE_1EDGE) \
  84.                                            || ((__VALUE__) == LL_USART_PHASE_2EDGE))
  85.  
  86. #define IS_LL_USART_CLOCKPOLARITY(__VALUE__) (((__VALUE__) == LL_USART_POLARITY_LOW) \
  87.                                               || ((__VALUE__) == LL_USART_POLARITY_HIGH))
  88.  
  89. #define IS_LL_USART_CLOCKOUTPUT(__VALUE__) (((__VALUE__) == LL_USART_CLOCK_DISABLE) \
  90.                                             || ((__VALUE__) == LL_USART_CLOCK_ENABLE))
  91.  
  92. #if defined(USART_SMARTCARD_SUPPORT)
  93. #define IS_LL_USART_STOPBITS(__VALUE__) (((__VALUE__) == LL_USART_STOPBITS_0_5) \
  94.                                          || ((__VALUE__) == LL_USART_STOPBITS_1) \
  95.                                          || ((__VALUE__) == LL_USART_STOPBITS_1_5) \
  96.                                          || ((__VALUE__) == LL_USART_STOPBITS_2))
  97. #else
  98. #define IS_LL_USART_STOPBITS(__VALUE__) (((__VALUE__) == LL_USART_STOPBITS_1) \
  99.                                          || ((__VALUE__) == LL_USART_STOPBITS_2))
  100. #endif
  101.  
  102. #define IS_LL_USART_HWCONTROL(__VALUE__) (((__VALUE__) == LL_USART_HWCONTROL_NONE) \
  103.                                           || ((__VALUE__) == LL_USART_HWCONTROL_RTS) \
  104.                                           || ((__VALUE__) == LL_USART_HWCONTROL_CTS) \
  105.                                           || ((__VALUE__) == LL_USART_HWCONTROL_RTS_CTS))
  106.  
  107. /**
  108.   * @}
  109.   */
  110.  
  111. /* Private function prototypes -----------------------------------------------*/
  112.  
  113. /* Exported functions --------------------------------------------------------*/
  114. /** @addtogroup USART_LL_Exported_Functions
  115.   * @{
  116.   */
  117.  
  118. /** @addtogroup USART_LL_EF_Init
  119.   * @{
  120.   */
  121.  
  122. /**
  123.   * @brief  De-initialize USART registers (Registers restored to their default values).
  124.   * @param  USARTx USART Instance
  125.   * @retval An ErrorStatus enumeration value:
  126.   *          - SUCCESS: USART registers are de-initialized
  127.   *          - ERROR: USART registers are not de-initialized
  128.   */
  129. ErrorStatus LL_USART_DeInit(USART_TypeDef *USARTx)
  130. {
  131.   ErrorStatus status = SUCCESS;
  132.  
  133.   /* Check the parameters */
  134.   assert_param(IS_UART_INSTANCE(USARTx));
  135.  
  136.   if (USARTx == USART1)
  137.   {
  138.     /* Force reset of USART clock */
  139.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART1);
  140.  
  141.     /* Release reset of USART clock */
  142.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART1);
  143.   }
  144. #if defined(USART2)
  145.   else if (USARTx == USART2)
  146.   {
  147.     /* Force reset of USART clock */
  148.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART2);
  149.  
  150.     /* Release reset of USART clock */
  151.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART2);
  152.   }
  153. #endif /* USART2 */
  154. #if defined(USART3)
  155.   else if (USARTx == USART3)
  156.   {
  157.     /* Force reset of USART clock */
  158.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART3);
  159.  
  160.     /* Release reset of USART clock */
  161.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART3);
  162.   }
  163. #endif /* USART3 */
  164. #if defined(USART4)
  165.   else if (USARTx == USART4)
  166.   {
  167.     /* Force reset of USART clock */
  168.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART4);
  169.  
  170.     /* Release reset of USART clock */
  171.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART4);
  172.   }
  173. #endif /* USART4 */
  174. #if defined(USART5)
  175.   else if (USARTx == USART5)
  176.   {
  177.     /* Force reset of USART clock */
  178.     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART5);
  179.  
  180.     /* Release reset of USART clock */
  181.     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART5);
  182.   }
  183. #endif /* USART5 */
  184. #if defined(USART6)
  185.   else if (USARTx == USART6)
  186.   {
  187.     /* Force reset of USART clock */
  188.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART6);
  189.  
  190.     /* Release reset of USART clock */
  191.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART6);
  192.   }
  193. #endif /* USART6 */
  194. #if defined(USART7)
  195.   else if (USARTx == USART7)
  196.   {
  197.     /* Force reset of USART clock */
  198.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART7);
  199.  
  200.     /* Release reset of USART clock */
  201.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART7);
  202.   }
  203. #endif /* USART7 */
  204. #if defined(USART8)
  205.   else if (USARTx == USART8)
  206.   {
  207.     /* Force reset of USART clock */
  208.     LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_USART8);
  209.  
  210.     /* Release reset of USART clock */
  211.     LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_USART8);
  212.   }
  213. #endif /* USART8 */
  214.   else
  215.   {
  216.     status = ERROR;
  217.   }
  218.  
  219.   return (status);
  220. }
  221.  
  222. /**
  223.   * @brief  Initialize USART registers according to the specified
  224.   *         parameters in USART_InitStruct.
  225.   * @note   As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0),
  226.   *         USART Peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
  227.   * @note   Baud rate value stored in USART_InitStruct BaudRate field, should be valid (different from 0).
  228.   * @param  USARTx USART Instance
  229.   * @param  USART_InitStruct pointer to a LL_USART_InitTypeDef structure
  230.   *         that contains the configuration information for the specified USART peripheral.
  231.   * @retval An ErrorStatus enumeration value:
  232.   *          - SUCCESS: USART registers are initialized according to USART_InitStruct content
  233.   *          - ERROR: Problem occurred during USART Registers initialization
  234.   */
  235. ErrorStatus LL_USART_Init(USART_TypeDef *USARTx, LL_USART_InitTypeDef *USART_InitStruct)
  236. {
  237.   ErrorStatus status = ERROR;
  238.   uint32_t periphclk = LL_RCC_PERIPH_FREQUENCY_NO;
  239. #if defined(USART2)||defined(USART3)||defined(USART4)
  240.   LL_RCC_ClocksTypeDef RCC_Clocks;
  241. #endif /* USART2 ||USART3 || USART4 */
  242.  
  243.   /* Check the parameters */
  244.   assert_param(IS_UART_INSTANCE(USARTx));
  245.   assert_param(IS_LL_USART_BAUDRATE(USART_InitStruct->BaudRate));
  246.   assert_param(IS_LL_USART_DATAWIDTH(USART_InitStruct->DataWidth));
  247.   assert_param(IS_LL_USART_STOPBITS(USART_InitStruct->StopBits));
  248.   assert_param(IS_LL_USART_PARITY(USART_InitStruct->Parity));
  249.   assert_param(IS_LL_USART_DIRECTION(USART_InitStruct->TransferDirection));
  250.   assert_param(IS_LL_USART_HWCONTROL(USART_InitStruct->HardwareFlowControl));
  251.   assert_param(IS_LL_USART_OVERSAMPLING(USART_InitStruct->OverSampling));
  252.  
  253.   /* USART needs to be in disabled state, in order to be able to configure some bits in
  254.      CRx registers */
  255.   if (LL_USART_IsEnabled(USARTx) == 0U)
  256.   {
  257.     /*---------------------------- USART CR1 Configuration ---------------------
  258.      * Configure USARTx CR1 (USART Word Length, Parity, Mode and Oversampling bits) with parameters:
  259.      * - DataWidth:          USART_CR1_M bits according to USART_InitStruct->DataWidth value
  260.      * - Parity:             USART_CR1_PCE, USART_CR1_PS bits according to USART_InitStruct->Parity value
  261.      * - TransferDirection:  USART_CR1_TE, USART_CR1_RE bits according to USART_InitStruct->TransferDirection value
  262.      * - Oversampling:       USART_CR1_OVER8 bit according to USART_InitStruct->OverSampling value.
  263.      */
  264.     MODIFY_REG(USARTx->CR1,
  265.                (USART_CR1_M | USART_CR1_PCE | USART_CR1_PS |
  266.                 USART_CR1_TE | USART_CR1_RE | USART_CR1_OVER8),
  267.                (USART_InitStruct->DataWidth | USART_InitStruct->Parity |
  268.                 USART_InitStruct->TransferDirection | USART_InitStruct->OverSampling));
  269.  
  270.     /*---------------------------- USART CR2 Configuration ---------------------
  271.      * Configure USARTx CR2 (Stop bits) with parameters:
  272.      * - Stop Bits:          USART_CR2_STOP bits according to USART_InitStruct->StopBits value.
  273.      * - CLKEN, CPOL, CPHA and LBCL bits are to be configured using LL_USART_ClockInit().
  274.      */
  275.     LL_USART_SetStopBitsLength(USARTx, USART_InitStruct->StopBits);
  276.  
  277.     /*---------------------------- USART CR3 Configuration ---------------------
  278.      * Configure USARTx CR3 (Hardware Flow Control) with parameters:
  279.      * - HardwareFlowControl: USART_CR3_RTSE, USART_CR3_CTSE bits according to USART_InitStruct->HardwareFlowControl value.
  280.      */
  281.     LL_USART_SetHWFlowCtrl(USARTx, USART_InitStruct->HardwareFlowControl);
  282.  
  283.     /*---------------------------- USART BRR Configuration ---------------------
  284.      * Retrieve Clock frequency used for USART Peripheral
  285.      */
  286.     if (USARTx == USART1)
  287.     {
  288.       periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART1_CLKSOURCE);
  289.     }
  290. #if defined(USART2)
  291.     else if (USARTx == USART2)
  292.     {
  293. #if defined(RCC_CFGR3_USART2SW)
  294.       periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART2_CLKSOURCE);
  295. #else
  296.       /* USART2 clock is PCLK */
  297.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  298.       periphclk = RCC_Clocks.PCLK1_Frequency;
  299. #endif
  300.     }
  301. #endif /* USART2 */
  302. #if defined(USART3)
  303.     else if (USARTx == USART3)
  304.     {
  305. #if defined(RCC_CFGR3_USART3SW)
  306.       periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART3_CLKSOURCE);
  307. #else
  308.       /* USART3 clock is PCLK */
  309.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  310.       periphclk = RCC_Clocks.PCLK1_Frequency;
  311. #endif
  312.     }
  313. #endif /* USART3 */
  314. #if defined(USART4)
  315.     else if (USARTx == USART4)
  316.     {
  317.       /* USART4 clock is PCLK1 */
  318.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  319.       periphclk = RCC_Clocks.PCLK1_Frequency;
  320.     }
  321. #endif /* USART4 */
  322. #if defined(USART5)
  323.     else if (USARTx == USART5)
  324.     {
  325.       /* USART5 clock is PCLK1 */
  326.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  327.       periphclk = RCC_Clocks.PCLK1_Frequency;
  328.     }
  329. #endif /* USART5 */
  330. #if defined(USART6)
  331.     else if (USARTx == USART6)
  332.     {
  333.       /* USART6 clock is PCLK */
  334.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  335.       periphclk = RCC_Clocks.PCLK1_Frequency;
  336.     }
  337. #endif /* USART6 */
  338. #if defined(USART7)
  339.     else if (USARTx == USART7)
  340.     {
  341.       /* USART7 clock is PCLK */
  342.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  343.       periphclk = RCC_Clocks.PCLK1_Frequency;
  344.     }
  345. #endif /* USART7 */
  346. #if defined(USART8)
  347.     else if (USARTx == USART8)
  348.     {
  349.       /* USART8 clock is PCLK */
  350.       LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
  351.       periphclk = RCC_Clocks.PCLK1_Frequency;
  352.     }
  353. #endif /* USART8 */
  354.     else
  355.     {
  356.       /* Nothing to do, as error code is already assigned to ERROR value */
  357.     }
  358.  
  359.     /* Configure the USART Baud Rate :
  360.        - valid baud rate value (different from 0) is required
  361.        - Peripheral clock as returned by RCC service, should be valid (different from 0).
  362.     */
  363.     if ((periphclk != LL_RCC_PERIPH_FREQUENCY_NO)
  364.         && (USART_InitStruct->BaudRate != 0U))
  365.     {
  366.       status = SUCCESS;
  367.       LL_USART_SetBaudRate(USARTx,
  368.                            periphclk,
  369.                            USART_InitStruct->OverSampling,
  370.                            USART_InitStruct->BaudRate);
  371.  
  372.       /* Check BRR is greater than or equal to 16d */
  373.       assert_param(IS_LL_USART_BRR_MIN(USARTx->BRR));
  374.  
  375.       /* Check BRR is lower than or equal to 0xFFFF */
  376.       assert_param(IS_LL_USART_BRR_MAX(USARTx->BRR));
  377.     }
  378.   }
  379.   /* Endif (=> USART not in Disabled state => return ERROR) */
  380.  
  381.   return (status);
  382. }
  383.  
  384. /**
  385.   * @brief Set each @ref LL_USART_InitTypeDef field to default value.
  386.   * @param USART_InitStruct pointer to a @ref LL_USART_InitTypeDef structure
  387.   *                         whose fields will be set to default values.
  388.   * @retval None
  389.   */
  390.  
  391. void LL_USART_StructInit(LL_USART_InitTypeDef *USART_InitStruct)
  392. {
  393.   /* Set USART_InitStruct fields to default values */
  394.   USART_InitStruct->BaudRate            = 9600U;
  395.   USART_InitStruct->DataWidth           = LL_USART_DATAWIDTH_8B;
  396.   USART_InitStruct->StopBits            = LL_USART_STOPBITS_1;
  397.   USART_InitStruct->Parity              = LL_USART_PARITY_NONE ;
  398.   USART_InitStruct->TransferDirection   = LL_USART_DIRECTION_TX_RX;
  399.   USART_InitStruct->HardwareFlowControl = LL_USART_HWCONTROL_NONE;
  400.   USART_InitStruct->OverSampling        = LL_USART_OVERSAMPLING_16;
  401. }
  402.  
  403. /**
  404.   * @brief  Initialize USART Clock related settings according to the
  405.   *         specified parameters in the USART_ClockInitStruct.
  406.   * @note   As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0),
  407.   *         USART Peripheral should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
  408.   * @param  USARTx USART Instance
  409.   * @param  USART_ClockInitStruct pointer to a @ref LL_USART_ClockInitTypeDef structure
  410.   *         that contains the Clock configuration information for the specified USART peripheral.
  411.   * @retval An ErrorStatus enumeration value:
  412.   *          - SUCCESS: USART registers related to Clock settings are initialized according to USART_ClockInitStruct content
  413.   *          - ERROR: Problem occurred during USART Registers initialization
  414.   */
  415. ErrorStatus LL_USART_ClockInit(USART_TypeDef *USARTx, LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
  416. {
  417.   ErrorStatus status = SUCCESS;
  418.  
  419.   /* Check USART Instance and Clock signal output parameters */
  420.   assert_param(IS_UART_INSTANCE(USARTx));
  421.   assert_param(IS_LL_USART_CLOCKOUTPUT(USART_ClockInitStruct->ClockOutput));
  422.  
  423.   /* USART needs to be in disabled state, in order to be able to configure some bits in
  424.      CRx registers */
  425.   if (LL_USART_IsEnabled(USARTx) == 0U)
  426.   {
  427.     /*---------------------------- USART CR2 Configuration -----------------------*/
  428.     /* If Clock signal has to be output */
  429.     if (USART_ClockInitStruct->ClockOutput == LL_USART_CLOCK_DISABLE)
  430.     {
  431.       /* Deactivate Clock signal delivery :
  432.        * - Disable Clock Output:        USART_CR2_CLKEN cleared
  433.        */
  434.       LL_USART_DisableSCLKOutput(USARTx);
  435.     }
  436.     else
  437.     {
  438.       /* Ensure USART instance is USART capable */
  439.       assert_param(IS_USART_INSTANCE(USARTx));
  440.  
  441.       /* Check clock related parameters */
  442.       assert_param(IS_LL_USART_CLOCKPOLARITY(USART_ClockInitStruct->ClockPolarity));
  443.       assert_param(IS_LL_USART_CLOCKPHASE(USART_ClockInitStruct->ClockPhase));
  444.       assert_param(IS_LL_USART_LASTBITCLKOUTPUT(USART_ClockInitStruct->LastBitClockPulse));
  445.  
  446.       /*---------------------------- USART CR2 Configuration -----------------------
  447.        * Configure USARTx CR2 (Clock signal related bits) with parameters:
  448.        * - Enable Clock Output:         USART_CR2_CLKEN set
  449.        * - Clock Polarity:              USART_CR2_CPOL bit according to USART_ClockInitStruct->ClockPolarity value
  450.        * - Clock Phase:                 USART_CR2_CPHA bit according to USART_ClockInitStruct->ClockPhase value
  451.        * - Last Bit Clock Pulse Output: USART_CR2_LBCL bit according to USART_ClockInitStruct->LastBitClockPulse value.
  452.        */
  453.       MODIFY_REG(USARTx->CR2,
  454.                  USART_CR2_CLKEN | USART_CR2_CPHA | USART_CR2_CPOL | USART_CR2_LBCL,
  455.                  USART_CR2_CLKEN | USART_ClockInitStruct->ClockPolarity |
  456.                  USART_ClockInitStruct->ClockPhase | USART_ClockInitStruct->LastBitClockPulse);
  457.     }
  458.   }
  459.   /* Else (USART not in Disabled state => return ERROR */
  460.   else
  461.   {
  462.     status = ERROR;
  463.   }
  464.  
  465.   return (status);
  466. }
  467.  
  468. /**
  469.   * @brief Set each field of a @ref LL_USART_ClockInitTypeDef type structure to default value.
  470.   * @param USART_ClockInitStruct pointer to a @ref LL_USART_ClockInitTypeDef structure
  471.   *                              whose fields will be set to default values.
  472.   * @retval None
  473.   */
  474. void LL_USART_ClockStructInit(LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
  475. {
  476.   /* Set LL_USART_ClockInitStruct fields with default values */
  477.   USART_ClockInitStruct->ClockOutput       = LL_USART_CLOCK_DISABLE;
  478.   USART_ClockInitStruct->ClockPolarity     = LL_USART_POLARITY_LOW;            /* Not relevant when ClockOutput = LL_USART_CLOCK_DISABLE */
  479.   USART_ClockInitStruct->ClockPhase        = LL_USART_PHASE_1EDGE;             /* Not relevant when ClockOutput = LL_USART_CLOCK_DISABLE */
  480.   USART_ClockInitStruct->LastBitClockPulse = LL_USART_LASTCLKPULSE_NO_OUTPUT;  /* Not relevant when ClockOutput = 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.