2021-02-19

stm32l552ret 序列槽接收DMA空閑中斷

接收數組定義：

#pragma pack(4)
unsigned char UART_DMA_BUFF[255];
#pragma pack()
           

static void MX_USART1_UART_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 9600;
  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;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
	
  if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_7_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_EnableFifoMode(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
	
  /* USER CODE BEGIN USART1_Init 2 */
 //使能序列槽空閑中斷

  __HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE);
   //DMA 接收位址設定
   HAL_UART_Receive_DMA(&huart1,UART_DMA_BUFF,255);
  /* USER CODE END USART1_Init 2 */

}
           

加入的是這兩行

序列槽接收裡改成這樣

#include "string.h"
extern unsigned char UART_DMA_BUFF[255];
unsigned char data_length;
void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */

  /* USER CODE END USART1_IRQn 0 */
  HAL_UART_IRQHandler(&huart1);
	if(__HAL_UART_GET_FLAG(&huart1, UART_FLAG_IDLE) != RESET)
	{
			/* USER CODE BEGIN USART1_IRQn 1 */
			__HAL_UART_CLEAR_IDLEFLAG(&huart1);//清楚序列槽二空閑中斷的标志位
		 
			HAL_UART_DMAStop(&huart1);
		
			data_length  = 255 - __HAL_DMA_GET_COUNTER(&hdma_usart1_rx);   //計算接收到的資料長度
			HAL_UART_Transmit(&huart1,UART_DMA_BUFF,data_length,0x200);             //測試函數：将接收到的資料列印出去		

			memset(UART_DMA_BUFF, 0 ,255); //清除數組

			HAL_UART_Receive_DMA(&huart1, UART_DMA_BUFF, 255);		
	}	


  /* USER CODE END USART1_IRQn 1 */
}
           

驗證如下：

附完整工程：

連結：https://pan.baidu.com/s/1EfFHEPwW1IwcBzTusqNm2A 

提取碼：1573