求助！stml051 uart2无输出。

ysp · 发表于 2016-8-3 17:28:46

自己画的最小系统，用st官网例程“UART_TwoBoards_ComIT”串口1，pa9、pa10可以正常传输，改为uart2后时钟发不了数据，pa2是一直低电平，pa3一直高电平。
/////////////////////////////////////////主程序//////////////////////////////////////////////////////////////////////
/**
  ******************************************************************************
  * @file UART/UART_TwoBoards_ComIT/Src/main.c
  * @author  MCD Application Team
  * @version V1.7.0
  * @date 31-May-2016
  * @brief This sample code shows how to use STM32L0xx 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>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  * 1. Redistributions of source code must retain the above copyright notice,
  *    this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

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

/** @addtogroup STM32L0xx_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;

/* Buffer used for transmission */
//uint8_t aTxBuffer[] = " ****UART_TwoBoards_ComIT****  ****UART_TwoBoards_ComIT****  ****UART_TwoBoards_ComIT**** ";
uint8_t aTxBuffer[] = "123456789\r\n";
/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];

/* Private function prototypes -----------------------------------------------*/
static 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)
{

  /* STM32L0xx HAL library initialization:
   - Configure the Flash prefetch, Flash preread and Buffer caches
   - 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.
   - Low Level Initialization
   */
  HAL_Init();
  /* Configure the system clock to 32 Mhz */
  SystemClock_Config();

  /*##-1- Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* UART1 configured as follow:
   - Word Length = 8 Bits
   - Stop Bit = One Stop bit
   - Parity = None
   - BaudRate = 9600 baud
   - Hardware flow control disabled (RTS and CTS signals) */
  UartHandle.Instance       = USARTx2;
  UartHandle.Init.BaudRate = 9600;
  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_Init(&UartHandle) != HAL_OK)
  {
Error_Handler();
  }
while (1)
{
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;
}

  /* Infinite loop */
while (1)
{
#ifdef TRANSMITTER_BOARD

  /*##-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 (UartReady != SET)
  {
  }

  /* Reset transmission flag */
  UartReady = RESET;

  /*##-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 *)aRxBuffer, RXBUFFERSIZE)!= HAL_OK)
//  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();
//  }
//

  }
}

/**
  * @brief  System Clock Configuration
  *       The system Clock is configured as follow :
  *          System Clock source          = PLL (HSI)
  *          SYSCLK(Hz)                   = 32000000
  *          HCLK(Hz)                      = 32000000
  *          AHB Prescaler                = 1
  *          APB1 Prescaler                = 1
  *          APB2 Prescaler                = 1
  *          HSI Frequency(Hz)             = 16000000
  *          PLL_MUL                      = 4
  *          PLL_DIV                      = 2
  *          Flash Latency(WS)             = 1
  *          Main regulator output voltage  = Scale1 mode
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;

  /* Enable Power Control clock */
  __HAL_RCC_PWR_CLK_ENABLE();

  /* The voltage scaling allows optimizing the power consumption when the device is
   clocked below the maximum system frequency, to update the voltage scaling value
   regarding system frequency refer to product datasheet.  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /* Enable HSI Oscillator and activate PLL with HSI as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;
  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;
  RCC_OscInitStruct.HSICalibrationValue = 0x10;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);

  /* 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;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_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: trasfer complete*/
  UartReady = SET;
}

/**
  * @brief  Rx Transfer completed callback
  * @param  UartHandle: UART handle
  * @note This example shows a simple way to report end of IT Rx transfer, and
  *       you can add your own implementation.
  * @retval None
  */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
  /* Set transmission flag: trasfer 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)
{
while(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)
{
while(1)
{
}
}

#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****/

//////////////////////////////////main.h///主要修改的文件////////////////////////////////////////////////////

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __MAIN_H
#define __MAIN_H

/* Includes ------------------------------------------------------------------*/
#include "stm32l0xx_hal.h"
#include "stm32l0538_discovery.h"

/* Exported types ------------------------------------------------------------*/
/* Exported constants --------------------------------------------------------*/
/* User can use this section to tailor USARTx/UARTx instance used and associated
resources */
/* Definition for USARTx clock resources */
#define USARTx2                         USART2
#define USARTx2_CLK_ENABLE()             __HAL_RCC_USART2_CLK_ENABLE();
#define USARTx2_RX_GPIO_CLK_ENABLE()    __HAL_RCC_GPIOA_CLK_ENABLE()
#define USARTx2_TX_GPIO_CLK_ENABLE()    __HAL_RCC_GPIOA_CLK_ENABLE()

#define USARTx2_FORCE_RESET()          __HAL_RCC_USART2_FORCE_RESET()
#define USARTx2_RELEASE_RESET()          __HAL_RCC_USART2_RELEASE_RESET()

/* Definition for USARTx Pins */
#define USARTx2_TX_PIN                   GPIO_PIN_2
#define USARTx2_TX_GPIO_PORT             GPIOA
#define USARTx2_TX_AF                   GPIO_AF4_USART2
#define USARTx2_RX_PIN                   GPIO_PIN_3
#define USARTx2_RX_GPIO_PORT             GPIOA
#define USARTx2_RX_AF                   GPIO_AF4_USART2

/* Definition for USARTx's NVIC */
#define USARTx2_IRQn                   USART2_IRQn
#define USARTx_IRQHandler             USART2_IRQHandler

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

/* Exported macro ------------------------------------------------------------*/
#define COUNTOF(__BUFFER__) (sizeof(__BUFFER__) / sizeof(*(__BUFFER__)))
/* Exported functions ------------------------------------------------------- */

#endif /* __MAIN_H */

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