STM32串列埠DMA接收雙緩衝

MrDaveDing發表於2021-01-03

串列埠

STM32高階MCU（F4、F7等）才支援DMA雙緩衝，低端MCU（F1）不支援DMA雙緩衝，不過有替代方案可實現型別效果。

一、MCU支援ＤＭＡ雙緩衝的情形

不再贅述，參見部落格 STM32 串列埠DMA傳送+DMA接收+硬體雙緩衝區切換功能實現

二、MCU不支援ＤＭＡ雙緩衝，但可通過DMA傳輸半完成中斷替代，以下程式碼已在F103上驗證通過。

1.先通過STM32CubeMX生成串列埠初始化程式碼

串列埠接收DMA一定要選擇Circular模式，並且使能串列埠接收中斷

串列埠接收DMA一定要選擇Circular模式

使能串列埠接收中斷

2.使能空閒中斷，空閒中斷中取出接收資料

3.在DAM接收半完成、完成中斷中取出接收資料

usart.c：

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

/* USER CODE BEGIN 0 */

#define DE_UART_DMA_BUF_LEN    128

extern void at_uart_recv_data(uint8_t *pdata, uint16_t len);

static volatile uint8_t RecvDMABuf[DE_UART_DMA_BUF_LEN];
static volatile uint8_t RecvLastIdx = 0;

/* USER CODE END 0 */

UART_HandleTypeDef huart1;
DMA_HandleTypeDef hdma_usart1_tx;
DMA_HandleTypeDef hdma_usart1_rx;

/* USART1 init function */

void MX_USART1_UART_Init(void)
{

  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }

}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(uartHandle->Instance==USART1)
  {
  /* USER CODE BEGIN USART1_MspInit 0 */

  /* USER CODE END USART1_MspInit 0 */
    /* USART1 clock enable */
    __HAL_RCC_USART1_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* USART1 DMA Init */
    /* USART1_TX Init */
    hdma_usart1_tx.Instance = DMA1_Channel4;
    hdma_usart1_tx.Init.Direction = DMA_MEMORY_TO_PERIPH;
    hdma_usart1_tx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_usart1_tx.Init.MemInc = DMA_MINC_ENABLE;
    hdma_usart1_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_usart1_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_usart1_tx.Init.Mode = DMA_NORMAL;
    hdma_usart1_tx.Init.Priority = DMA_PRIORITY_LOW;
    if (HAL_DMA_Init(&hdma_usart1_tx) != HAL_OK)
    {
      Error_Handler();
    }

    __HAL_LINKDMA(uartHandle,hdmatx,hdma_usart1_tx);

    /* USART1_RX Init */
    hdma_usart1_rx.Instance = DMA1_Channel5;
    hdma_usart1_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_usart1_rx.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_usart1_rx.Init.MemInc = DMA_MINC_ENABLE;
    hdma_usart1_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
    hdma_usart1_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
    hdma_usart1_rx.Init.Mode = DMA_CIRCULAR;
    hdma_usart1_rx.Init.Priority = DMA_PRIORITY_LOW;
    if (HAL_DMA_Init(&hdma_usart1_rx) != HAL_OK)
    {
      Error_Handler();
    }

    __HAL_LINKDMA(uartHandle,hdmarx,hdma_usart1_rx);

    /* USART1 interrupt Init */
    HAL_NVIC_SetPriority(USART1_IRQn, 5, 0);
    HAL_NVIC_EnableIRQ(USART1_IRQn);
  /* USER CODE BEGIN USART1_MspInit 1 */

    /*Enable the IDLE Interrupt*/
    __HAL_UART_ENABLE_IT(uartHandle,UART_IT_IDLE);
    __HAL_UART_CLEAR_FLAG(uartHandle, UART_IT_IDLE);
    
  /* USER CODE END USART1_MspInit 1 */
  }
}

void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
{

  if(uartHandle->Instance==USART1)
  {
  /* USER CODE BEGIN USART1_MspDeInit 0 */

  /* USER CODE END USART1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_USART1_CLK_DISABLE();

    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);

    /* USART1 DMA DeInit */
    HAL_DMA_DeInit(uartHandle->hdmatx);
    HAL_DMA_DeInit(uartHandle->hdmarx);

    /* USART1 interrupt Deinit */
    HAL_NVIC_DisableIRQ(USART1_IRQn);
  /* USER CODE BEGIN USART1_MspDeInit 1 */

  /* USER CODE END USART1_MspDeInit 1 */
  }
}

/* USER CODE BEGIN 1 */

/**
  * @brief  Rx Half Transfer completed callbacks.
  * @param  huart  Pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @retval None
  */
void HAL_UART_RxHalfCpltCallback(UART_HandleTypeDef *huart)
{
    if(huart->Instance == huart1.Instance)
    {
        //DebugPrintf("HAL_UART_RxHalfCpltCallback\n");
        
        uint32_t TotalLen = DE_UART_DMA_BUF_LEN - __HAL_DMA_GET_COUNTER(huart->hdmarx);
        
        if(TotalLen > RecvLastIdx)
        {
            uint32_t RecvLen = TotalLen - RecvLastIdx;
            at_uart_recv_data((uint8_t *)&RecvDMABuf[RecvLastIdx],RecvLen);
            RecvLastIdx = TotalLen;            
        }
    }
}

/**
  * @brief  Rx Transfer completed callbacks.
  * @param  huart  Pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @retval None
  */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if(huart->Instance == huart1.Instance)
    {
        //DebugPrintf("HAL_UART_RxCpltCallback\n");
        uint32_t TotalLen = DE_UART_DMA_BUF_LEN;
        
        if(TotalLen > RecvLastIdx)
        {
            uint32_t RecvLen = TotalLen - RecvLastIdx;
            at_uart_recv_data((uint8_t *)&RecvDMABuf[RecvLastIdx],RecvLen);
            RecvLastIdx = 0;            
        }
    }
}


/**
  * @brief  Rx IDLE callback
  * @param  huart: UART handle. 
  * @note   This example shows a simple way to report end of DMA Tx transfer, and 
  *         you can add your own implementation. 
  * @retval None
  */
static void UART_IDLE_CallBack(UART_HandleTypeDef *huart)
{
    if(huart->Instance == huart1.Instance)
    {
        //DebugPrintf("UART_IDLE_CallBack\n");
        
        uint32_t TotalLen = DE_UART_DMA_BUF_LEN - __HAL_DMA_GET_COUNTER(huart->hdmarx);
        //DebugPrintf("TotalLen:%d\n",TotalLen);
        
        if(TotalLen > RecvLastIdx)
        {
            uint32_t RecvLen = TotalLen - RecvLastIdx;
            at_uart_recv_data((uint8_t *)&RecvDMABuf[RecvLastIdx],RecvLen);
            RecvLastIdx = TotalLen;
        }
    }
}

/**
  * @brief  UART_Idle_IRQHandler
  * @param  huart  Pointer to a UART_HandleTypeDef structure that contains
  *                the configuration information for the specified UART module.
  * @retval HAL status
  */
void UART_Idle_IRQHandler(UART_HandleTypeDef *huart)
{
    if(__HAL_UART_GET_FLAG(huart, UART_FLAG_IDLE) != RESET)
    {
         __HAL_UART_CLEAR_IDLEFLAG(huart);
         __HAL_UART_FLUSH_DRREGISTER(huart);
         UART_IDLE_CallBack(huart);
    }
}

void UART1_StartReceiveDMA(void)
{
    HAL_UART_Receive_DMA(&huart1,(uint8_t *)RecvDMABuf,sizeof(RecvDMABuf));
}

stm32f1xx_it.c

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_it.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */

/* USER CODE END TD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
extern void UART_Idle_IRQHandler(UART_HandleTypeDef *huart);
/* USER CODE END 0 */

/* External variables --------------------------------------------------------*/
extern DMA_HandleTypeDef hdma_usart1_tx;
extern DMA_HandleTypeDef hdma_usart1_rx;
extern UART_HandleTypeDef huart1;
extern TIM_HandleTypeDef htim2;

/* USER CODE BEGIN EV */

/* USER CODE END EV */

/******************************************************************************/
/*           Cortex-M3 Processor Interruption and Exception Handlers          */
/******************************************************************************/
/**
  * @brief This function handles Non maskable interrupt.
  */
void NMI_Handler(void)
{
  /* USER CODE BEGIN NonMaskableInt_IRQn 0 */

  /* USER CODE END NonMaskableInt_IRQn 0 */
  /* USER CODE BEGIN NonMaskableInt_IRQn 1 */

  /* USER CODE END NonMaskableInt_IRQn 1 */
}

/**
  * @brief This function handles Hard fault interrupt.
  */
void HardFault_Handler(void)
{
  /* USER CODE BEGIN HardFault_IRQn 0 */

  /* USER CODE END HardFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_HardFault_IRQn 0 */
    /* USER CODE END W1_HardFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Memory management fault.
  */
void MemManage_Handler(void)
{
  /* USER CODE BEGIN MemoryManagement_IRQn 0 */

  /* USER CODE END MemoryManagement_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
    /* USER CODE END W1_MemoryManagement_IRQn 0 */
  }
}

/**
  * @brief This function handles Prefetch fault, memory access fault.
  */
void BusFault_Handler(void)
{
  /* USER CODE BEGIN BusFault_IRQn 0 */

  /* USER CODE END BusFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_BusFault_IRQn 0 */
    /* USER CODE END W1_BusFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Undefined instruction or illegal state.
  */
void UsageFault_Handler(void)
{
  /* USER CODE BEGIN UsageFault_IRQn 0 */

  /* USER CODE END UsageFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_UsageFault_IRQn 0 */
    /* USER CODE END W1_UsageFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Debug monitor.
  */
void DebugMon_Handler(void)
{
  /* USER CODE BEGIN DebugMonitor_IRQn 0 */

  /* USER CODE END DebugMonitor_IRQn 0 */
  /* USER CODE BEGIN DebugMonitor_IRQn 1 */

  /* USER CODE END DebugMonitor_IRQn 1 */
}

/******************************************************************************/
/* STM32F1xx Peripheral Interrupt Handlers                                    */
/* Add here the Interrupt Handlers for the used peripherals.                  */
/* For the available peripheral interrupt handler names,                      */
/* please refer to the startup file (startup_stm32f1xx.s).                    */
/******************************************************************************/

/**
  * @brief This function handles DMA1 channel4 global interrupt.
  */
void DMA1_Channel4_IRQHandler(void)
{
  /* USER CODE BEGIN DMA1_Channel4_IRQn 0 */

  /* USER CODE END DMA1_Channel4_IRQn 0 */
  HAL_DMA_IRQHandler(&hdma_usart1_tx);
  /* USER CODE BEGIN DMA1_Channel4_IRQn 1 */

  /* USER CODE END DMA1_Channel4_IRQn 1 */
}

/**
  * @brief This function handles DMA1 channel5 global interrupt.
  */
void DMA1_Channel5_IRQHandler(void)
{
  /* USER CODE BEGIN DMA1_Channel5_IRQn 0 */

  /* USER CODE END DMA1_Channel5_IRQn 0 */
  HAL_DMA_IRQHandler(&hdma_usart1_rx);
  /* USER CODE BEGIN DMA1_Channel5_IRQn 1 */

  /* USER CODE END DMA1_Channel5_IRQn 1 */
}

/**
  * @brief This function handles TIM2 global interrupt.
  */
void TIM2_IRQHandler(void)
{
  /* USER CODE BEGIN TIM2_IRQn 0 */

  /* USER CODE END TIM2_IRQn 0 */
  HAL_TIM_IRQHandler(&htim2);
  /* USER CODE BEGIN TIM2_IRQn 1 */

  /* USER CODE END TIM2_IRQn 1 */
}

/**
  * @brief This function handles USART1 global interrupt.
  */
void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */

  /* USER CODE END USART1_IRQn 0 */
  HAL_UART_IRQHandler(&huart1);
  /* USER CODE BEGIN USART1_IRQn 1 */
  UART_Idle_IRQHandler(&huart1);
    
  /* USER CODE END USART1_IRQn 1 */
}

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

1、此時DMA緩衝區類似一個FIFI，RecvLastIdx用來指示當前可以讀取資料的起始位置。
2、在ＤＭＡ接收半完成中斷和ＤＭＡ接收完成中斷之後的空閒中斷中不能重複取接收資料，通過判斷TotalLen > RecvLastIdx可避免。
3、該方法也適用於F4、F7等高階MCU。

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