コード例 #1
0
/**
  * @brief  De-initialize USART registers (Registers restored to their default values).
  * @param  USARTx USART Instance
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: USART registers are de-initialized
  *          - ERROR: USART registers are not de-initialized
  */
ErrorStatus LL_USART_DeInit(USART_TypeDef *USARTx)
{
  ErrorStatus status = SUCCESS;

  /* Check the parameters */
  assert_param(IS_UART_INSTANCE(USARTx));

  if (USARTx == USART1)
  {
    /* Force reset of USART clock */
    LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_USART1);

    /* Release reset of USART clock */
    LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_USART1);
  }
  else if (USARTx == USART2)
  {
    /* Force reset of USART clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART2);

    /* Release reset of USART clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART2);
  }
#if defined(USART3)
  else if (USARTx == USART3)
  {
    /* Force reset of USART clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_USART3);

    /* Release reset of USART clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_USART3);
  }
#endif /* USART3 */
#if defined(UART4)
  else if (USARTx == UART4)
  {
    /* Force reset of UART clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_UART4);

    /* Release reset of UART clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_UART4);
  }
#endif /* UART4 */
#if defined(UART5)
  else if (USARTx == UART5)
  {
    /* Force reset of UART clock */
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_UART5);

    /* Release reset of UART clock */
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_UART5);
  }
#endif /* UART5 */
  else
  {
    status = ERROR;
  }

  return (status);
}
コード例 #2
0
/**
  * @brief  Initialize USART Clock related settings according to the
  *         specified parameters in the USART_ClockInitStruct.
  * @note   As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0),
  *         USART IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
  * @param  USARTx USART Instance
  * @param  USART_ClockInitStruct: pointer to a @ref LL_USART_ClockInitTypeDef structure
  *         that contains the Clock configuration information for the specified USART peripheral.
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: USART registers related to Clock settings are initialized according to USART_ClockInitStruct content
  *          - ERROR: Problem occurred during USART Registers initialization
  */
ErrorStatus LL_USART_ClockInit(USART_TypeDef *USARTx, LL_USART_ClockInitTypeDef *USART_ClockInitStruct)
{
  ErrorStatus status = SUCCESS;

  /* Check USART Instance and Clock signal output parameters */
  assert_param(IS_UART_INSTANCE(USARTx));
  assert_param(IS_LL_USART_CLOCKOUTPUT(USART_ClockInitStruct->ClockOutput));

  /* USART needs to be in disabled state, in order to be able to configure some bits in
     CRx registers */
  if (LL_USART_IsEnabled(USARTx) == 0U)
  {
    /*---------------------------- USART CR2 Configuration -----------------------*/
    /* If Clock signal has to be output */
    if (USART_ClockInitStruct->ClockOutput == LL_USART_CLOCK_DISABLE)
    {
      /* Deactivate Clock signal delivery :
       * - Disable Clock Output:        USART_CR2_CLKEN cleared
       */
      LL_USART_DisableSCLKOutput(USARTx);
    }
    else
    {
      /* Ensure USART instance is USART capable */
      assert_param(IS_USART_INSTANCE(USARTx));

      /* Check clock related parameters */
      assert_param(IS_LL_USART_CLOCKPOLARITY(USART_ClockInitStruct->ClockPolarity));
      assert_param(IS_LL_USART_CLOCKPHASE(USART_ClockInitStruct->ClockPhase));
      assert_param(IS_LL_USART_LASTBITCLKOUTPUT(USART_ClockInitStruct->LastBitClockPulse));

      /*---------------------------- USART CR2 Configuration -----------------------
       * Configure USARTx CR2 (Clock signal related bits) with parameters:
       * - Enable Clock Output:         USART_CR2_CLKEN set
       * - Clock Polarity:              USART_CR2_CPOL bit according to USART_ClockInitStruct->ClockPolarity value
       * - Clock Phase:                 USART_CR2_CPHA bit according to USART_ClockInitStruct->ClockPhase value
       * - Last Bit Clock Pulse Output: USART_CR2_LBCL bit according to USART_ClockInitStruct->LastBitClockPulse value.
       */
      MODIFY_REG(USARTx->CR2,
                 USART_CR2_CLKEN | USART_CR2_CPHA | USART_CR2_CPOL | USART_CR2_LBCL,
                 USART_CR2_CLKEN | USART_ClockInitStruct->ClockPolarity |
                 USART_ClockInitStruct->ClockPhase | USART_ClockInitStruct->LastBitClockPulse);
    }
  }
  /* Else (USART not in Disabled state => return ERROR */
  else
  {
    status = ERROR;
  }

  return (status);
}
コード例 #3
0
ファイル: cUartPort.c プロジェクト: glocklueng/myLib
/** @brief: init state flag acc to info in huart
 *  @details: used in Uart3Debug_Init, private
 ****************************************************************/
static HAL_StatusTypeDef MyHAL_UARTInit(UART_HandleTypeDef * huart) {
    /* Check the UART handle allocation */
    if (huart == NULL) {
        return HAL_ERROR;
    }

    /* Check the parameters */
    if (huart->Init.HwFlowCtl != UART_HWCONTROL_NONE) {
        /* The hardware flow control is available only for USART1, USART2, USART3 and USART6 */
        assert_param(IS_UART_HWFLOW_INSTANCE(huart->Instance));
        assert_param(IS_UART_HARDWARE_FLOW_CONTROL(huart->Init.HwFlowCtl));
    } else {
        assert_param(IS_UART_INSTANCE(huart->Instance));
    }
    assert_param(IS_UART_WORD_LENGTH(huart->Init.WordLength));
    assert_param(IS_UART_OVERSAMPLING(huart->Init.OverSampling));

    if (huart->State == HAL_UART_STATE_RESET) {
        /* Allocate lock resource and initialize it */
        huart->Lock = HAL_UNLOCKED;
        /* Init the low level hardware */
//		HAL_NVIC_SetPriority(USART3_IRQn, 0, 0);
//		HAL_NVIC_EnableIRQ(USART3_IRQn);
    }

    huart->State = HAL_UART_STATE_BUSY;

    /* Disable the peripheral */
    __HAL_UART_DISABLE(huart);

    /* Set the UART Communication parameters */
    MyUARTSetConfig(huart);

    /* In asynchronous mode, the following bits must be kept cleared:
     * - LINEN and CLKEN bits in the USART_CR2 register,
     * - SCEN, HDSEL and IREN  bits in the USART_CR3 register.*/
    huart->Instance->CR2 &= ~(USART_CR2_LINEN | USART_CR2_CLKEN);
    huart->Instance->CR3 &=
        ~(USART_CR3_SCEN | USART_CR3_HDSEL | USART_CR3_IREN);

    /* Enable the peripheral */
    __HAL_UART_ENABLE(huart);

    /* Initialize the UART state */
    huart->ErrorCode = HAL_UART_ERROR_NONE;
    huart->State = HAL_UART_STATE_READY;

    return HAL_OK;
} /* MyHAL_UARTInit */
コード例 #4
0
/**
  * @brief  Initialize USART registers according to the specified
  *         parameters in USART_InitStruct.
  * @note   As some bits in USART configuration registers can only be written when the USART is disabled (USART_CR1_UE bit =0),
  *         USART IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.
  * @note   Baud rate value stored in USART_InitStruct BaudRate field, should be valid (different from 0).
  * @param  USARTx USART Instance
  * @param  USART_InitStruct: pointer to a LL_USART_InitTypeDef structure
  *         that contains the configuration information for the specified USART peripheral.
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: USART registers are initialized according to USART_InitStruct content
  *          - ERROR: Problem occurred during USART Registers initialization
  */
ErrorStatus LL_USART_Init(USART_TypeDef *USARTx, LL_USART_InitTypeDef *USART_InitStruct)
{
  ErrorStatus status = ERROR;
  uint32_t periphclk = LL_RCC_PERIPH_FREQUENCY_NO;
#if (defined(USART4) || defined(USART5))
  LL_RCC_ClocksTypeDef RCC_Clocks;
#endif

  /* Check the parameters */
  assert_param(IS_UART_INSTANCE(USARTx));
  assert_param(IS_LL_USART_BAUDRATE(USART_InitStruct->BaudRate));
  assert_param(IS_LL_USART_DATAWIDTH(USART_InitStruct->DataWidth));
  assert_param(IS_LL_USART_STOPBITS(USART_InitStruct->StopBits));
  assert_param(IS_LL_USART_PARITY(USART_InitStruct->Parity));
  assert_param(IS_LL_USART_DIRECTION(USART_InitStruct->TransferDirection));
  assert_param(IS_LL_USART_HWCONTROL(USART_InitStruct->HardwareFlowControl));
  assert_param(IS_LL_USART_OVERSAMPLING(USART_InitStruct->OverSampling));

  /* USART needs to be in disabled state, in order to be able to configure some bits in
     CRx registers */
  if (LL_USART_IsEnabled(USARTx) == 0U)
  {
    /*---------------------------- USART CR1 Configuration -----------------------
     * Configure USARTx CR1 (USART Word Length, Parity, Mode and Oversampling bits) with parameters:
     * - DataWidth:          USART_CR1_M bits according to USART_InitStruct->DataWidth value
     * - Parity:             USART_CR1_PCE, USART_CR1_PS bits according to USART_InitStruct->Parity value
     * - TransferDirection:  USART_CR1_TE, USART_CR1_RE bits according to USART_InitStruct->TransferDirection value
     * - Oversampling:       USART_CR1_OVER8 bit according to USART_InitStruct->OverSampling value.
     */
    MODIFY_REG(USARTx->CR1,
               (USART_CR1_M | USART_CR1_PCE | USART_CR1_PS |
                USART_CR1_TE | USART_CR1_RE | USART_CR1_OVER8),
               (USART_InitStruct->DataWidth | USART_InitStruct->Parity |
                USART_InitStruct->TransferDirection | USART_InitStruct->OverSampling));

    /*---------------------------- USART CR2 Configuration -----------------------
     * Configure USARTx CR2 (Stop bits) with parameters:
     * - Stop Bits:          USART_CR2_STOP bits according to USART_InitStruct->StopBits value.
     * - CLKEN, CPOL, CPHA and LBCL bits are to be configured using LL_USART_ClockInit().
     */
    LL_USART_SetStopBitsLength(USARTx, USART_InitStruct->StopBits);

    /*---------------------------- USART CR3 Configuration -----------------------
     * Configure USARTx CR3 (Hardware Flow Control) with parameters:
     * - HardwareFlowControl: USART_CR3_RTSE, USART_CR3_CTSE bits according to USART_InitStruct->HardwareFlowControl value.
     */
    LL_USART_SetHWFlowCtrl(USARTx, USART_InitStruct->HardwareFlowControl);

    /*---------------------------- USART BRR Configuration -----------------------
     * Retrieve Clock frequency used for USART Peripheral
     */
#if defined(USART1)
    if (USARTx == USART1)
    {
      periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART1_CLKSOURCE);
    }
#endif /* USART1 */
#if defined(USART1)
    else if (USARTx == USART2)
#else
    if (USARTx == USART2)
#endif
    {
      periphclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART2_CLKSOURCE);
    }
#if defined(USART4)
    else if (USARTx == USART4)
    {
      /* USART4 clock is PCLK1 */
      LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
      periphclk = RCC_Clocks.PCLK1_Frequency;
    }
#endif /* USART4 */
#if defined(USART5)
    else if (USARTx == USART5)
    {
      /* USART5 clock is PCLK1 */
      LL_RCC_GetSystemClocksFreq(&RCC_Clocks);
      periphclk = RCC_Clocks.PCLK1_Frequency;
    }
#endif /* USART5 */
    else
    {
      /* Nothing to do, as error code is already assigned to ERROR value */
    }

    /* Configure the USART Baud Rate :
       - valid baud rate value (different from 0) is required
       - Peripheral clock as returned by RCC service, should be valid (different from 0).
    */
    if ((periphclk != LL_RCC_PERIPH_FREQUENCY_NO)
        && (USART_InitStruct->BaudRate != 0U))
    {
      status = SUCCESS;
      LL_USART_SetBaudRate(USARTx,
                           periphclk,
                           USART_InitStruct->OverSampling,
                           USART_InitStruct->BaudRate);
    }
  }
  /* Endif (=> USART not in Disabled state => return ERROR) */

  return (status);
}