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| 有大神调试STM32H7串口DMA接收时出现过“串口DMA接收短时间内频繁收到大量数据后,串口就“挂死”,软重启没用只能断电重启串口才正常”这个问题没? 我测试时发现一旦短时间内给串口灌入大量数据,这个串口收发就没反应了,即能接收数据也不会进中断了,感觉就是串口这个外设挂掉了,一时之间排查不出到底是软件问题还是硬件问题?
 
 以下是UART接收DMA回调函数:
 
 
 uint16_t uart1_count,uart2_count,uart3_count;
 void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
 {
 if(huart->Instance==USART1)//如果是串口1
 {
 uart1_count= UART_RxBufSize - __HAL_DMA_GET_COUNTER(&UART1DMA_Rx);
 if(uart1_count != 0){
 UART1DMA_Rx.Lock = HAL_UNLOCKED;
 if(huart->pRxBuffPtr < UART_RecvBuf[1])
 {
 CFifoUint8_InBlock(&UART1_RXcircularBuf.cfifo,UART_RecvBuf[0],uart1_count);
 HAL_UART_Receive_DMA(&UART1_Handler,UART_RecvBuf[1],UART_RxBufSize);
 }else{
 CFifoUint8_InBlock(&UART1_RXcircularBuf.cfifo,UART_RecvBuf[1],uart1_count);
 HAL_UART_Receive_DMA(&UART1_Handler,UART_RecvBuf[0],UART_RxBufSize);
 }
 UART1DMA_Rx.Lock = HAL_LOCKED;
 }
 }else if(huart->Instance==USART2)//如果是串口2 - wifi
 {
 uart2_count= Wifi_UART_RxBufSize - __HAL_DMA_GET_COUNTER(&UART2DMA_Rx);
 if(uart2_count != 0){
 UART2DMA_Rx.Lock = HAL_UNLOCKED;
 if(huart->pRxBuffPtr < UART2Wifi_RecvBuf[1])
 {
 CFifoUint8_InBlock(&UART2WIFI_RXcircularBuf.cfifo,UART2Wifi_RecvBuf[0],uart2_count);
 HAL_UART_Receive_DMA(&UART2_Handler,UART2Wifi_RecvBuf[1],Wifi_UART_RxBufSize);
 }else{
 CFifoUint8_InBlock(&UART2WIFI_RXcircularBuf.cfifo,UART2Wifi_RecvBuf[1],uart2_count);
 HAL_UART_Receive_DMA(&UART2_Handler,UART2Wifi_RecvBuf[0],Wifi_UART_RxBufSize);
 }
 UART2DMA_Rx.Lock = HAL_LOCKED;
 }
 }else if(huart->Instance==USART3)//如果是串口3 - RS485
 {
 uart3_count= UART485_RxBufSize - __HAL_DMA_GET_COUNTER(&UART3DMA_Rx);
 if(uart3_count != 0){
 UART3DMA_Rx.Lock = HAL_UNLOCKED;
 if(huart->pRxBuffPtr < UARTRS485_RecvBuf[1])
 {
 CFifoUint8_InBlock(&UART3RS485_RXcircularBuf.cfifo,UARTRS485_RecvBuf[0],uart3_count);
 HAL_UART_Receive_DMA(&UART3_Handler,UARTRS485_RecvBuf[1],UART485_RxBufSize);
 }else{
 CFifoUint8_InBlock(&UART3RS485_RXcircularBuf.cfifo,UARTRS485_RecvBuf[1],uart3_count);
 HAL_UART_Receive_DMA(&UART3_Handler,UARTRS485_RecvBuf[0],UART485_RxBufSize);
 }
 UART3DMA_Rx.Lock = HAL_LOCKED;
 }
 }
 }
 
 
 
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