STM32cubemx-HAL庫串列埠斷線問題
阿新 • • 發佈:2019-12-27
STM32cubemx:version5.1
Chip: STM32F446RE
IDE:Keil5
Q:小專案上寫了個簡單的通訊包,波特率230400,資料量較大1600Byte/s,DMA的方式實現接收,量產後發現跑久了部分機器會有隻能傳送不能接收的問題。
查了很久沒查到。中間加了斷線檢測,重新初始化串列埠,卻無法解決。最後面發現,HAL的鍋。
部分程式碼:
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); } } } }
上述的程式碼絕大多數時間都能夠正常執行。但是,總會出現莫名奇妙的掉線問題。並且難以複線。查了好久,看到有類似的問題,HAL庫會不處理異常的行為,要使用者處理。
在某些情況下,HAL_UART_Receive_IT 並沒有成功執行,返回了busy 或者erro,這時候整個流程就背打斷了。並且串列埠還會被莫名其妙鎖上。
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. */ }
修改後,出現busy或者erro時強制解鎖,重新接收。根據log,大約半小時會出現一次。三臺經常性出現的機子更新後執行一天,沒有出現這個問題。在log中檢視到了對應的修正過