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STM32L例程03--串口输出usart及其printf重定向(基于cola_os)

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我是靠谱客的博主 舒心乐曲，最近开发中收集的这篇文章主要介绍STM32L例程03--串口输出usart及其printf重定向(基于cola_os)，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

一、实验目的

1.实现串口信息打印。

2.每1s钟打印一次信息。

3.串口接收到数据，然后打印出来

一、实验步骤

1.CubeMax配置

配置PA9，PA10为串口输出，导出工程。

2.usart驱动创建

串口驱动实现原理：

中断接收到数据后通过事件通知应用层。

stm32_usart.c

#include "config.h"
#include "stm32l0xx_hal.h"
#include "cola_device.h"
#include "cola_os.h"
#include "config.h"
#include "usart.h"



#ifdef USING_USART1 

static cola_device_t usart1_dev;         //串口驱动函数
static task_t * usart1_depen_task = NULL;//当前串口所在的应用任务
static uint8_t data = 0; //用来暂时存放数据的，正常使用缓冲区，后期给出



#ifdef USING_DEBUG
int fputc(int ch, FILE *f)
{      
    HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFF);
    return ch;
}
#endif


static void uart1_configuration(uint32_t bund)
{
    MX_USART1_UART_Init();
    huart1.Init.BaudRate = bund;
    HAL_UART_Init(&huart1);
    __HAL_UART_ENABLE_IT(&huart1, UART_IT_RXNE);
    __HAL_UART_ENABLE_IT(&huart1, UART_IT_ERR);
}

static void uart1_sendnbyte(uint8_t *pData, uint16_t Length)
{
    HAL_UART_Transmit(&huart1,pData,Length,0xFF);
}
static int uart1_write(cola_device_t *dev,int pos, const void *buffer, int size)
{
	uart1_sendnbyte((uint8_t *)buffer,size);
	return size;
}
static int uart1_read(cola_device_t *dev,int pos, void *buffer, int size)
{
    uint8_t *index = (uint8_t *)buffer;
    index[0] = data;
    return 1;

}

static void USART1_RECV_IRQHandler(UART_HandleTypeDef *huart)
{
    //uint8_t c;
    data = (uint8_t)(huart->Instance->RDR);
    if(usart1_depen_task)
        cola_set_event(usart1_depen_task,SIG_DATA);
}

static int uart1_config(cola_device_t *dev,void *pos,void *args)
{
    struct serial_configure *cfg = (struct serial_configure *)args;
    uart1_configuration(cfg->baud_rate);
    usart1_depen_task = (task_t *)pos;
    return 0;
}

static struct cola_device_ops uart1_ops =
{
    .write  = uart1_write,
    .read   = uart1_read,
    .config = uart1_config,
};

static void USER_UART1_IRQHandler(UART_HandleTypeDef *huart)
{
  uint32_t isrflags   = READ_REG(huart->Instance->ISR);
  uint32_t cr1its     = READ_REG(huart->Instance->CR1);
  uint32_t cr3its     = READ_REG(huart->Instance->CR3);

  uint32_t errorflags;
  uint32_t errorcode;

  /* If no error occurs */
  errorflags = (isrflags & (uint32_t)(USART_ISR_PE | USART_ISR_FE | USART_ISR_ORE | USART_ISR_NE));
  if (errorflags == 0U)
  {
    /* UART in mode Receiver ---------------------------------------------------*/
    if (((isrflags & USART_ISR_RXNE) != 0U)
        && ((cr1its & USART_CR1_RXNEIE) != 0U))
    {
      if (huart->RxISR != NULL)
      {
        huart->RxISR(huart);
        
      }
      USART1_RECV_IRQHandler(huart);
      return;
    }
  }

  /* If some errors occur */
  if ((errorflags != 0U)
      && (((cr3its & USART_CR3_EIE) != 0U)
          || ((cr1its & (USART_CR1_RXNEIE | USART_CR1_PEIE)) != 0U)))
  {
    /* UART parity error interrupt occurred -------------------------------------*/
    if (((isrflags & USART_ISR_PE) != 0U) && ((cr1its & USART_CR1_PEIE) != 0U))
    {
      __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_PEF);

      huart->ErrorCode |= HAL_UART_ERROR_PE;
    }

    /* UART frame error interrupt occurred --------------------------------------*/
    if (((isrflags & USART_ISR_FE) != 0U) && ((cr3its & USART_CR3_EIE) != 0U))
    {
      __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_FEF);

      huart->ErrorCode |= HAL_UART_ERROR_FE;
    }

    /* UART noise error interrupt occurred --------------------------------------*/
    if (((isrflags & USART_ISR_NE) != 0U) && ((cr3its & USART_CR3_EIE) != 0U))
    {
      __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_NEF);

      huart->ErrorCode |= HAL_UART_ERROR_NE;
    }

    /* UART Over-Run interrupt occurred -----------------------------------------*/
    if (((isrflags & USART_ISR_ORE) != 0U)
        && (((cr1its & USART_CR1_RXNEIE) != 0U) ||
            ((cr3its & USART_CR3_EIE) != 0U)))
    {
      __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_OREF);

      huart->ErrorCode |= HAL_UART_ERROR_ORE;
    }

    /* Call UART Error Call back function if need be --------------------------*/
    if (huart->ErrorCode != HAL_UART_ERROR_NONE)
    {
      /* UART in mode Receiver ---------------------------------------------------*/
      if (((isrflags & USART_ISR_RXNE) != 0U)
          && ((cr1its & USART_CR1_RXNEIE) != 0U))
      {
        if (huart->RxISR != NULL)
        {
          huart->RxISR(huart);
        }
      }

      /* If Overrun error occurs, or if any error occurs in DMA mode reception,
         consider error as blocking */
      errorcode = huart->ErrorCode;
      if ((HAL_IS_BIT_SET(huart->Instance->CR3, USART_CR3_DMAR)) ||
          ((errorcode & HAL_UART_ERROR_ORE) != 0U))
      {
        /* Blocking error : transfer is aborted
           Set the UART state ready to be able to start again the process,
           Disable Rx Interrupts, and disable Rx DMA request, if ongoing */
        //UART_EndRxTransfer(huart);

        /* Disable the UART DMA Rx request if enabled */
        if (HAL_IS_BIT_SET(huart->Instance->CR3, USART_CR3_DMAR))
        {
          CLEAR_BIT(huart->Instance->CR3, USART_CR3_DMAR);

          /* Abort the UART DMA Rx channel */
          if (huart->hdmarx != NULL)
          {
            /* Set the UART DMA Abort callback :
               will lead to call HAL_UART_ErrorCallback() at end of DMA abort procedure */
           // huart->hdmarx->XferAbortCallback = UART_DMAAbortOnError;

            /* Abort DMA RX */
            if (HAL_DMA_Abort_IT(huart->hdmarx) != HAL_OK)
            {
              /* Call Directly huart->hdmarx->XferAbortCallback function in case of error */
              huart->hdmarx->XferAbortCallback(huart->hdmarx);
            }
          }
          else
          {
            /* Call user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
            /*Call registered error callback*/
            huart->ErrorCallback(huart);
#else
            /*Call legacy weak error callback*/
            HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */

          }
        }
        else
        {
          /* Call user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
          /*Call registered error callback*/
          huart->ErrorCallback(huart);
#else
          /*Call legacy weak error callback*/
          HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
        }
      }
      else
      {
        /* Non Blocking error : transfer could go on.
           Error is notified to user through user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
        /*Call registered error callback*/
        huart->ErrorCallback(huart);
#else
        /*Call legacy weak error callback*/
        HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
        huart->ErrorCode = HAL_UART_ERROR_NONE;
      }
    }
    return;

  } /* End if some error occurs */

  /* UART wakeup from Stop mode interrupt occurred ---------------------------*/
  if (((isrflags & USART_ISR_WUF) != 0U) && ((cr3its & USART_CR3_WUFIE) != 0U))
  {
    __HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_WUF);

    /* UART Rx state is not reset as a reception process might be ongoing.
       If UART handle state fields need to be reset to READY, this could be done in Wakeup callback */

#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
    /* Call registered Wakeup Callback */
    huart->WakeupCallback(huart);
#else
    /* Call legacy weak Wakeup Callback */
    HAL_UARTEx_WakeupCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
    return;
  }

  /* UART in mode Transmitter ------------------------------------------------*/
  if (((isrflags & USART_ISR_TXE) != 0U)
      && ((cr1its & USART_CR1_TXEIE) != 0U))
  {
    if (huart->TxISR != NULL)
    {
      huart->TxISR(huart);
    }
    return;
  }

  /* UART in mode Transmitter (transmission end) -----------------------------*/
  if (((isrflags & USART_ISR_TC) != 0U) && ((cr1its & USART_CR1_TCIE) != 0U))
  {
   // UART_EndTransmit_IT(huart);
    return;
  }

}

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */

  /* USER CODE END USART1_IRQn 0 */
  USER_UART1_IRQHandler(&huart1);
  /* USER CODE BEGIN USART1_IRQn 1 */

  /* USER CODE END USART1_IRQn 1 */
}

void usart_register(void)
{
#ifdef USING_USART1
    uart1_configuration(115200);
    
    usart1_dev.name = "usart1";
    usart1_dev.dops = &uart1_ops;
    cola_device_register(&usart1_dev);
#endif
}
device_initcall(usart_register);
#endif

3.usart应用

#include "cola_device.h"
#include "cola_os.h"
#include "example.h"


#ifdef APP_USART
static task_t timer_1s;
static task_t usart_task;
static cola_device_t *app_usart_dev;

//led每1s状态改变一次
static void timer_1s_cb(uint32_t event)
{
    os_log("app_usart running...rn");
}

//usart 主函数任务管理
static void usart_task_event(uint32_t event)
{
    uint8_t tmp[32] = {0};
    int err = 0;
    if(event & SIG_DATA)
    {
        err = cola_device_read(app_usart_dev,0,tmp,1);
        if(err)
        {
            cola_device_write(app_usart_dev,0,tmp,err);
        }
    }
    
}
static void usart_config(void)
{
    app_usart_dev = cola_device_find("usart1");
    assert(app_usart_dev);
    struct  serial_configure cfg;
    cfg.baud_rate = 9600;
    cola_device_config(app_usart_dev,&usart_task,&cfg);
}


void app_usart_init(void)
{
    cola_timer_create(&timer_1s,timer_1s_cb);
    cola_timer_start(&timer_1s,TIMER_ALWAYS,1000);
    cola_task_create(&usart_task,usart_task_event);
    usart_config();
}

#endif

四、运行调试

五、总结

串口使用115200时，接收打印时会出现丢包，串口接收最好配合环形缓冲区使用，加缓冲区方式会在后期例程中讲解。

gitHub:https://github.com/sckuck-bit/stm32l0_demo

最后

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