使用DMA中断接收串口 不定量数据
设置如下：
1. 接收中断增加
?? ?void HAL_UART_IRQHandler(UART_HandleTypeDef *huart)
?? ?增加
?? ?if(((isrflags & USART_ISR_IDLE) != RESET) && ((cr1its & USART_CR1_IDLEIE) != RESET))
?? ? {
?? ?//Record the received bytes number
?? ? Rev_Size = huart->RxXferSize - huart->hdmarx->Instance->CNDTR;
?? ?//clear the IDLE flag
?? ?__HAL_UART_CLEAR_IDLEFLAG(huart);
?? ?//Abord the received process
?? ?HAL_UART_AbortReceive_IT(huart);
?? ? return;
?? ? }
2. DMA接收增加
?? ?HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
?? ?//Modification 1
?? ?SET_BIT(huart->Instance->CR1, USART_CR1_IDLEIE);
3. 空闲中断改动
?? ?HAL_StatusTypeDef HAL_UART_AbortReceive_IT(UART_HandleTypeDef *huart)
?? ?//ATOMIC_CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE));
?? ?CLEAR_BIT(huart->Instance->CR1, (USART_CR1_RXNEIE | USART_CR1_PEIE| USART_CR1_IDLEIE));
4. 重写空闲接收
void HAL_UART_AbortReceiveCpltCallback (UART_HandleTypeDef *huart)
{
?? ?if(huart->Instance == LPUART1)?? ?// 判断是由哪个串口触发的中断
?? ?{
?? ??? ?UartReady1 = SET;
?? ?}
?? ?else?? ?if(huart->Instance == USART2)?? ?// 判断是由哪个串口触发的中断
?? ?{
?? ??? ?UartReady2 = SET;
?? ??? ?
?? ??? ?for(uint16_t i = 0; i < Rev_Size; i++)
?? ??? ?{
?? ??? ?//printf(" 0x%02X", DMARxBuf1[i]);
?? ??? ?printf("%c", DMARxBuf1[i]);
?? ??? ?}
?? ??? ?
?? ??? ?//Re-start receiving
?? ??? ?HAL_UART_Receive_DMA(&huart2,(uint8_t*)DMARxBuf1,BUFFERSIZE);
?? ?}
?? ?else?? ?if(huart->Instance == USART4)?? ?// 判断是由哪个串口触发的中断
?? ?{
?? ??? ?UartReady4 = SET;
?? ?}
}
测试效果：
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