使用 STM32L476RG 时出现 UART 溢出错误
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【中文标题】使用 STM32L476RG 时出现 UART 溢出错误【英文标题】：UART overrrun error while using STM32L476RG 【发布时间】：2019-06-14 19:59:17 【问题描述】：我在 STM32L476RG 上运行我的代码，每次接收数据时都会生成一个 UART 中断。我为此目的使用 UART2，并在我从终端发送数据后调用 USART2_IRQHandler。但是在HAL_UART_IRQHandler 内部，我的代码卡在了溢出错误中断上。这是什么原因？我一直在努力找出问题的根源。这是我的代码 -
UART 配置 -
void uart_config(void)
/* Configure the UART peripheral ######################################*/
/* Put the USART peripheral in UART Mode */
/* UART configured as follows:
- Word Length = 8 Bits
- Stop Bit = One Stop bit
- Parity = None
- BaudRate = 9600 baud
- Hardware flow control disabled (RTS and CTS signals) */
UartHandle.Instance = USARTx;//USART2
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;
UartHandle.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
sprintf(errvar,"This is line %d of file %s (function %s)\n", __LINE__, __FILE__, __func__);
Error_Handler(101); // See "error codes.txt"
if(HAL_UART_Init(&UartHandle) != HAL_OK)
sprintf(errvar,"This is line %d of file %s (function %s)\n", __LINE__, __FILE__, __func__);
Error_Handler(102); // See "error codes.txt"
/* Put UART peripheral in reception process */
if(HAL_UART_Receive_IT(&UartHandle, &aRxBuffer, 1) != HAL_OK)
sprintf(errvar,"This is line %d of file %s (function %s)\n", __LINE__, __FILE__, __func__);
Error_Handler(103); // See "error codes.txt"
#ifdef DEBUG_MODE
sprintf(dispvar,"UART = USART%d \n BAUDRATE = %d \n Word Length = 8 bits \n Stop Bit = 1 \nParity = None \n Flow Control = None \n Mode = TxRx ", 2,UartHandle.Init.BaudRate );
serial_printf();
#endif
中断处理程序 -
void HAL_UART_IRQHandler(UART_HandleTypeDef *huart)
uint32_t isrflags = READ_REG(huart->Instance->ISR);
uint32_t cr1its = READ_REG(huart->Instance->CR1);
uint32_t cr3its = READ_REG(huart->Instance->CR3);
uint32_t errorflags;
/* If no error occurs */
errorflags = (isrflags & (uint32_t)(USART_ISR_PE | USART_ISR_FE | USART_ISR_ORE | USART_ISR_NE));
if (errorflags == RESET)
/* UART in mode Receiver ---------------------------------------------------*/
#if defined(USART_CR1_FIFOEN)
if (((isrflags & USART_ISR_RXNE_RXFNE) != RESET)
&& (((cr1its & USART_CR1_RXNEIE_RXFNEIE) != RESET)
|| ((cr3its & USART_CR3_RXFTIE) != RESET)))
#else
if (((isrflags & USART_ISR_RXNE) != RESET)
&& ((cr1its & USART_CR1_RXNEIE) != RESET))
#endif
if (huart->RxISR != NULL)
huart->RxISR(huart);
return;
/* If some errors occur */
#if defined(USART_CR1_FIFOEN)
if ((errorflags != RESET)
&& ((((cr3its & (USART_CR3_RXFTIE | USART_CR3_EIE)) != RESET)
|| ((cr1its & (USART_CR1_RXNEIE_RXFNEIE | USART_CR1_PEIE)) != RESET))))
#else
if ((errorflags != RESET)
&& (((cr3its & USART_CR3_EIE) != RESET)
|| ((cr1its & (USART_CR1_RXNEIE | USART_CR1_PEIE)) != RESET)))
#endif
/* UART parity error interrupt occurred -------------------------------------*/
if (((isrflags & USART_ISR_PE) != RESET) && ((cr1its & USART_CR1_PEIE) != RESET))
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_PEF);
huart->ErrorCode |= HAL_UART_ERROR_PE;
/* UART frame error interrupt occurred --------------------------------------*/
if (((isrflags & USART_ISR_FE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_FEF);
huart->ErrorCode |= HAL_UART_ERROR_FE;
/* UART noise error interrupt occurred --------------------------------------*/
if (((isrflags & USART_ISR_NE) != RESET) && ((cr3its & USART_CR3_EIE) != RESET))
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_NEF);
huart->ErrorCode |= HAL_UART_ERROR_NE;
/* UART Over-Run interrupt occurred -----------------------------------------*/
#if defined(USART_CR1_FIFOEN)
if (((isrflags & USART_ISR_ORE) != RESET)
&& (((cr1its & USART_CR1_RXNEIE_RXFNEIE) != RESET) ||
((cr3its & (USART_CR3_RXFTIE | USART_CR3_EIE)) != RESET)))
#else
if (((isrflags & USART_ISR_ORE) != RESET)
&& (((cr1its & USART_CR1_RXNEIE) != RESET) ||
((cr3its & USART_CR3_EIE) != RESET)))
#endif
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_OREF);
huart->ErrorCode |= HAL_UART_ERROR_ORE;
/* Call UART Error Call back function if need be --------------------------*/
if (huart->ErrorCode != HAL_UART_ERROR_NONE)
/* UART in mode Receiver ---------------------------------------------------*/
#if defined(USART_CR1_FIFOEN)
if (((isrflags & USART_ISR_RXNE_RXFNE) != RESET)
&& (((cr1its & USART_CR1_RXNEIE_RXFNEIE) != RESET)
|| ((cr3its & USART_CR3_RXFTIE) != RESET)))
#else
if (((isrflags & USART_ISR_RXNE) != RESET)
&& ((cr1its & USART_CR1_RXNEIE) != RESET))
#endif
if (huart->RxISR != NULL)
huart->RxISR(huart);
/* If Overrun error occurs, or if any error occurs in DMA mode reception,
consider error as blocking */
if (((huart->ErrorCode & HAL_UART_ERROR_ORE) != RESET) ||
(HAL_IS_BIT_SET(huart->Instance->CR3, USART_CR3_DMAR)))
/* Blocking error : transfer is aborted
Set the UART gState ready to be able to start again the process,
Disable Rx Interrupts, and disable Rx DMA request, if ongoing */
UART_EndRxTransfer(huart);
/* Disable the UART DMA Rx request if enabled */
if (HAL_IS_BIT_SET(huart->Instance->CR3, USART_CR3_DMAR))
CLEAR_BIT(huart->Instance->CR3, USART_CR3_DMAR);
/* Abort the UART DMA Rx channel */
if (huart->hdmarx != NULL)
/* Set the UART DMA Abort callback :
will lead to call HAL_UART_ErrorCallback() at end of DMA abort procedure */
huart->hdmarx->XferAbortCallback = UART_DMAAbortOnError;
/* Abort DMA RX */
if (HAL_DMA_Abort_IT(huart->hdmarx) != HAL_OK)
/* Call Directly huart->hdmarx->XferAbortCallback function in case of error */
huart->hdmarx->XferAbortCallback(huart->hdmarx);
else
/* Call user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/*Call registered error callback*/
huart->ErrorCallback(huart);
#else
/*Call legacy weak error callback*/
HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
else
/* Call user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/*Call registered error callback*/
huart->ErrorCallback(huart);
#else
/*Call legacy weak error callback*/
HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
else
/* Non Blocking error : transfer could go on.
Error is notified to user through user error callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/*Call registered error callback*/
huart->ErrorCallback(huart);
#else
/*Call legacy weak error callback*/
HAL_UART_ErrorCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
huart->ErrorCode = HAL_UART_ERROR_NONE;
return;
/* End if some error occurs */
/* UART wakeup from Stop mode interrupt occurred ---------------------------*/
if (((isrflags & USART_ISR_WUF) != RESET) && ((cr3its & USART_CR3_WUFIE) != RESET))
__HAL_UART_CLEAR_FLAG(huart, UART_CLEAR_WUF);
/* UART Rx gState is not reset as a reception process might be ongoing.
If UART handle gState fields need to be reset to READY, this could be done in Wakeup callback */
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/* Call registered Wakeup Callback */
huart->WakeupCallback(huart);
#else
/* Call legacy weak Wakeup Callback */
HAL_UARTEx_WakeupCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
return;
/* UART in mode Transmitter ------------------------------------------------*/
#if defined(USART_CR1_FIFOEN)
if (((isrflags & USART_ISR_TXE_TXFNF) != RESET)
&& (((cr1its & USART_CR1_TXEIE_TXFNFIE) != RESET)
|| ((cr3its & USART_CR3_TXFTIE) != RESET)))
#else
if (((isrflags & USART_ISR_TXE) != RESET)
&& ((cr1its & USART_CR1_TXEIE) != RESET))
#endif
if (huart->TxISR != NULL)
huart->TxISR(huart);
return;
/* UART in mode Transmitter (transmission end) -----------------------------*/
if (((isrflags & USART_ISR_TC) != RESET) && ((cr1its & USART_CR1_TCIE) != RESET))
UART_EndTransmit_IT(huart);
return;
#if defined(USART_CR1_FIFOEN)
/* UART TX Fifo Empty occurred ----------------------------------------------*/
if (((isrflags & USART_ISR_TXFE) != RESET) && ((cr1its & USART_CR1_TXFEIE) != RESET))
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/* Call registered Tx Fifo Empty Callback */
huart->TxFifoEmptyCallback(huart);
#else
/* Call legacy weak Tx Fifo Empty Callback */
HAL_UARTEx_TxFifoEmptyCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
return;
/* UART RX Fifo Full occurred ----------------------------------------------*/
if (((isrflags & USART_ISR_RXFF) != RESET) && ((cr1its & USART_CR1_RXFFIE) != RESET))
#if (USE_HAL_UART_REGISTER_CALLBACKS == 1)
/* Call registered Rx Fifo Full Callback */
huart->RxFifoFullCallback(huart);
#else
/* Call legacy weak Rx Fifo Full Callback */
HAL_UARTEx_RxFifoFullCallback(huart);
#endif /* USE_HAL_UART_REGISTER_CALLBACKS */
return;
#endif
【问题讨论】：
我看不到编写自己的 ISR 处理程序和使用 HAL 库的任何意义。您应该使用标准的或编写 100% 裸寄存器实现（我推荐）并且不要使用 UART HAL 函数。 【参考方案1】：我自己解决了。看起来 HAL UART .c 和 .h 文件中存在一些问题。我刚刚从同一板的另一个示例程序中复制了它们，它工作正常。
【讨论】：
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