标签：cal 解决 nbsp mpi version 数据 instance ret sed
STM32cubemx：version5.1
Chip: STM32F446RE
IDE:Keil5
Q：小项目上写了个简单的通信包，波特率230400，数据量较大1600Byte/s,DMA的方式实现接收，量产后发现跑久了部分机器会有只能发送不能接收的问题。
查了很久没查到。中间加了断线检测，重新初始化串口，却无法解决。最后面发现，HAL的锅。
部分代码：
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if(huart->Instance == UART4) { uint8_t ret=HAL_OK; if(frame_in_sync) { if(UART_Rx_Buffer.head == 0x55 && UART_Rx_Buffer.end == 0xAA) { // TODO: check check-sum UART_Rx_Data = UART_Rx_Buffer; ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, sizeof(UART_Rx_Buffer)); uart_updata_time= HAL_GetTick(); } else { // frame not in sync, drop coming bytes until read an end(0xAA) frame_in_sync = 0; ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, 1); } } else { if( *(uint8_t *)&UART_Rx_Buffer == 0xAA) { frame_in_sync = 1; ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, sizeof(UART_Rx_Buffer)); } else { ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, 1); } } } }
上述的代码绝大多数时间都能够正常运行。但是，总会出现莫名奇妙的掉线问题。并且难以复线。查了好久，看到有类似的问题，HAL库会不处理异常的行为，要用户处理。
在某些情况下，HAL_UART_Receive_IT 并没有成功执行，返回了busy 或者erro，这时候整个流程就背打断了。并且串口还会被莫名其妙锁上。
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if(huart->Instance == UART4) { uint8_t ret=HAL_OK; if(frame_in_sync) { if(UART_Rx_Buffer.head == 0x55 && UART_Rx_Buffer.end == 0xAA) { // TODO: check check-sum UART_Rx_Data = UART_Rx_Buffer; ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, sizeof(UART_Rx_Buffer)); uart_updata_time= HAL_GetTick(); } else { // frame not in sync, drop coming bytes until read an end(0xAA) frame_in_sync = 0; ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, 1); } } else { if( *(uint8_t *)&UART_Rx_Buffer == 0xAA) { frame_in_sync = 1; ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, sizeof(UART_Rx_Buffer)); } else { ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, 1); } } while(ret!=HAL_OK){ /*try to fix connection bug 20191225*/ printf("UART4:RECEIVE_IT:%d\r\n",ret); //for log huart->RxState = HAL_UART_STATE_READY; __HAL_UNLOCK(huart); ret=HAL_UART_Receive_IT(&huart4, (uint8_t *)&UART_Rx_Buffer, 1); } } } void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart) { /* Prevent unused argument(s) compilation warning */ if(huart->ErrorCode&HAL_UART_ERROR_ORE) { __HAL_UART_CLEAR_OREFLAG(huart); } /* NOTE : This function should not be modified, when the callback is needed, the HAL_UART_ErrorCallback can be implemented in the user file. */ }
修改后，出现busy或者erro时强制解锁，重新接收。根据log，大约半小时会出现一次。三台经常性出现的机子更新后运行一天，没有出现这个问题。在log中查看到了对应的修正过程。
标签：cal 解决 nbsp mpi version 数据 instance ret sed
原文地址：https://www.cnblogs.com/CXianRen/p/12105074.html
