STM32L433 串口2 能发送，不能接收数据

a5908252

用的是STM32nucleo -l433RC，调试串口的时候串口只能发送，接收收不到数据，接收中断进不去。
/**
  ******************************************************************************
  * @file    UART/UART_TwoBoards_ComIT/Src/main.c
  * @Author  MCD Application Team
  * @brief   This sample code shows how to use UART HAL API to transmit
  *          and receive a data buffer with a communication process based on
  *          IT transfer.
  *          The communication is done using 2 Boards.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32L4xx_HAL_Examples
  * @{
  */

/** @addtogroup UART_TwoBoards_ComIT
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define TRANSMITTER_BOARD

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* UART handler declaration */
UART_HandleTypeDef UartHandle;
__IO ITStatus UartReady = RESET;
__IO uint32_t VirtualUserButtonStatus = 0;  /* set to 1 after User set a button  */

/* Buffer used for transmission */
uint8_t aTxBuffer[] = " ****UART_TwoBoards_ComIT****  ****UART_TwoBoards_ComIT****  ****UART_TwoBoards_ComIT**** ";

/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
#ifdef TRANSMITTER_BOARD
  GPIO_InitTypeDef  GPIO_InitStruct;
#endif
  /* STM32L4xx HAL library initialization:
       - Configure the Flash prefetch
       - Systick timer is configured by default as source of time base, but user
         can eventually implement his proper time base source (a general purpose
         timer for example or other time source), keeping in mind that Time base
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 80 MHz */
  SystemClock_Config();

  /* Configure LED3 */
  BSP_LED_Init(LED3);

  /*##-1- Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* UART configured as follows:
      - Word Length = 8 Bits
      - Stop Bit = One Stop bit
      - Parity = None
      - BaudRate = 9600 baud
      - Hardware flow control disabled (RTS and CTS signals) */
  UartHandle.Instance        = USARTx;

  UartHandle.Init.BaudRate   = 115200;
  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits   = UART_STOPBITS_1;
  UartHandle.Init.Parity     = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode       = UART_MODE_TX_RX;
  if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
  {
    Error_Handler();
  }  
  if(HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    Error_Handler();
  }

#ifdef TRANSMITTER_BOARD

  /* Configure PA.12 (Arduino D2) as input with External interrupt */
  GPIO_InitStruct.Pin = GPIO_PIN_12;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;

  /* Enable GPIOA clock */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* Enable and set PA.12 (Arduino D2) EXTI Interrupt to the lowest priority */
  NVIC_SetPriority((IRQn_Type)(EXTI15_10_IRQn), 0x03);
  HAL_NVIC_EnableIRQ((IRQn_Type)(EXTI15_10_IRQn));
  NVIC_SetPriority((IRQn_Type)(USARTx_IRQn), 0x02);
  HAL_NVIC_EnableIRQ((IRQn_Type)(USARTx_IRQn));
//  while(1)
//  {
//    HAL_UART_Transmit_IT(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE);
//  }
  /* Wait for the user to set GPIOA to GND before starting the Communication.
     In the meantime, LED3 is blinking */
//  while(VirtualUserButtonStatus == 0)
//  {
//      /* Toggle LED3*/
//      BSP_LED_Toggle(LED3);
//      HAL_Delay(100);
//  }

  BSP_LED_Off(LED3);

  /* The board sends the message and expects to receive it back */

  /*##-2- Start the transmission process #####################################*/  
  /* While the UART in reception process, user can transmit data through
     "aTxBuffer" buffer */
  if(HAL_UART_Transmit_IT(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK)
  {
    Error_Handler();
  }

  /*##-3- Wait for the end of the transfer ###################################*/   
  while (UartReady != SET)
  {
  }

  /* Reset transmission flag */
  UartReady = RESET;

  /*##-4- Put UART peripheral in reception process ###########################*/  
  if(HAL_UART_Receive_IT(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
  {
    Error_Handler();
  }

#else

  /* The board receives the message and sends it back */

  /*##-2- Put UART peripheral in reception process ###########################*/  
  if(HAL_UART_Receive_IT(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
  {
    Error_Handler();
  }

  /*##-3- Wait for the end of the transfer ###################################*/   
  /* While waiting for message to come from the other board, LED3 is
     blinking according to the following pattern: a double flash every half-second */  
  while (UartReady != SET)
  {
      BSP_LED_On(LED3);
      HAL_Delay(100);
      BSP_LED_Off(LED3);
      HAL_Delay(100);
      BSP_LED_On(LED3);
      HAL_Delay(100);
      BSP_LED_Off(LED3);
      HAL_Delay(500);
  }

  /* Reset transmission flag */
  UartReady = RESET;
  BSP_LED_Off(LED3);

  /*##-4- Start the transmission process #####################################*/  
  /* While the UART in reception process, user can transmit data through
     "aTxBuffer" buffer */
  if(HAL_UART_Transmit_IT(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK)
  {
    Error_Handler();
  }

#endif /* TRANSMITTER_BOARD */

  /*##-5- Wait for the end of the transfer ###################################*/   
  while (UartReady != SET)
  {
  }

  /* Reset transmission flag */
  UartReady = RESET;

  /*##-6- Compare the sent and received buffers ##############################*/
  if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE))
  {
    Error_Handler();
  }

  /* Turn on LED3 if test passes then enter infinite loop */
  BSP_LED_On(LED3);
  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follows :
  *            System Clock source            = PLL (MSI)
  *            SYSCLK(Hz)                     = 80000000
  *            HCLK(Hz)                       = 80000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            APB2 Prescaler                 = 1
  *            MSI Frequency(Hz)              = 4000000
  *            PLL_M                          = 1
  *            PLL_N                          = 40
  *            PLL_R                          = 2
  *            PLL_P                          = 7
  *            PLL_Q                          = 4
  *            Flash Latency(WS)              = 4
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  /* MSI is enabled after System reset, activate PLL with MSI as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
  RCC_OscInitStruct.PLL.PLLM = 1;
  RCC_OscInitStruct.PLL.PLLN = 40;
  RCC_OscInitStruct.PLL.PLLR = 2;
  RCC_OscInitStruct.PLL.PLLP = 7;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    /* Initialization Error */
    while(1);
  }

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
     clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;  
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;  
  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
  {
    /* Initialization Error */
    while(1);
  }
}

/**
  * @brief  Tx Transfer completed callback
  * @param  UartHandle: UART handle.
  * @note   This example shows a simple way to report end of IT Tx transfer, and
  *         you can add your own implementation.
  * @retval None
  */
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *UartHandle)
{
  /* Set transmission flag: transfer complete */
  UartReady = SET;


}

/**
  * @brief  Rx Transfer completed callback
  * @param  UartHandle: UART handle
  * @note   This example shows a simple way to report end of DMA Rx transfer, and
  *         you can add your own implementation.
  * @retval None
  */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
  /* Set transmission flag: transfer complete */
  UartReady = SET;


}

/**
  * @brief  UART error callbacks
  * @param  UartHandle: UART handle
  * @note   This example shows a simple way to report transfer error, and you can
  *         add your own implementation.
  * @retval None
  */
void HAL_UART_ErrorCallback(UART_HandleTypeDef *UartHandle)
{
    Error_Handler();
}


/**
  * @brief EXTI line detection callbacks
  * @param GPIO_Pin: Specifies the pins connected EXTI line
  * @retval None
  */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == GPIO_PIN_12)
  {
    VirtualUserButtonStatus = 1;
  }
}
/**
  * @brief  Compares two buffers.
  * @param  pBuffer1, pBuffer2: buffers to be compared.
  * @param  BufferLength: buffer's length
  * @retval 0  : pBuffer1 identical to pBuffer2
  *         >0 : pBuffer1 differs from pBuffer2
  */
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
  while (BufferLength--)
  {
    if ((*pBuffer1) != *pBuffer2)
    {
      return BufferLength;
    }
    pBuffer1++;
    pBuffer2++;
  }

  return 0;
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Turn LED3 on */
  BSP_LED_On(LED3);
  while(1)
  {
    /* Error if LED3 is slowly blinking (1 sec. period) */
    BSP_LED_Toggle(LED3);
    HAL_Delay(1000);
  }  
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif


/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

a5908252

补充，串口GPIO的配置
void HAL_UART_MspInit(UART_HandleTypeDef *huart)
{  
  GPIO_InitTypeDef  GPIO_InitStruct;
  
  /*##-1- Enable peripherals and GPIO Clocks #################################*/
  /* Enable GPIO TX/RX clock */
  USARTx_TX_GPIO_CLK_ENABLE();
  USARTx_RX_GPIO_CLK_ENABLE();


  /* Enable USARTx clock */
  USARTx_CLK_ENABLE();
  
  /*##-2- Configure peripheral GPIO ##########################################*/  
  /* UART TX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = USARTx_TX_PIN;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.Alternate = USARTx_TX_AF;

  HAL_GPIO_Init(USARTx_TX_GPIO_PORT, &GPIO_InitStruct);

  /* UART RX GPIO pin configuration  */
  GPIO_InitStruct.Pin = USARTx_RX_PIN;
  GPIO_InitStruct.Alternate = USARTx_RX_AF;

  HAL_GPIO_Init(USARTx_RX_GPIO_PORT, &GPIO_InitStruct);
   
  /*##-3- Configure the NVIC for UART ########################################*/
  /* NVIC for USART */
  HAL_NVIC_SetPriority(USARTx_IRQn, 0, 1);
  HAL_NVIC_EnableIRQ(USARTx_IRQn);
}

a5908252

#define USARTx                           USART2
#define USARTx_CLK_ENABLE()              __HAL_RCC_USART2_CLK_ENABLE()
#define USARTx_RX_GPIO_CLK_ENABLE()      __HAL_RCC_GPIOA_CLK_ENABLE()
#define USARTx_TX_GPIO_CLK_ENABLE()      __HAL_RCC_GPIOA_CLK_ENABLE()

#define USARTx_FORCE_RESET()             __HAL_RCC_USART2_FORCE_RESET()
#define USARTx_RELEASE_RESET()           __HAL_RCC_USART2_RELEASE_RESET()

/* Definition for USARTx Pins */
#define USARTx_TX_PIN                    GPIO_PIN_2
#define USARTx_TX_GPIO_PORT              GPIOA
#define USARTx_TX_AF                     GPIO_AF7_USART2
#define USARTx_RX_PIN                    GPIO_PIN_3
#define USARTx_RX_GPIO_PORT              GPIOA
#define USARTx_RX_AF                     GPIO_AF7_USART2

/* Definition for USARTx's NVIC */
#define USARTx_IRQn                      USART2_IRQn
#define USARTx_IRQHandler                USART2_IRQHandler

/* Size of Trasmission buffer */
#define TXBUFFERSIZE                      (COUNTOF(aTxBuffer) - 1)
/* Size of Reception buffer */
#define RXBUFFERSIZE                      TXBUFFERSIZE