Question
HAL UART Error but no Error Code
Posted on August 07, 2017 at 17:32
Hello, I am getting UART errors (by the means of the HAL_UART_ErrorCallback callback function) but the strange thing is that the value of handle->ErrorCode is zero! So, an error but no error code. I think there is a logical error in the UART driver, here is a the offending part from the STM32L0 UART driver, my comments are the ones starting by '<--------':
/* Call UART Error Call back function if need be --------------------------*/
if(huart->ErrorCode != HAL_UART_ERROR_NONE) // <------------ The debugger Enters here because huart->ErrorCode is HAL_UART_ERROR_ORE
{
/* UART in mode Receiver ---------------------------------------------------*/
if(((isrflags & USART_ISR_RXNE) != RESET) && ((cr1its & USART_CR1_RXNEIE) != RESET))
{
UART_Receive_IT(huart); // <---------- but this function clears huart->ErrorCode value back to zero!!!
}
/* 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 state 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 */
HAL_UART_ErrorCallback(huart);
}
}
else
{
/* Call user error callback */
HAL_UART_ErrorCallback(huart);
}
}
else
{
/* Non Blocking error : transfer could go on.
Error is notified to user through user error callback */
HAL_UART_ErrorCallback(huart);
huart->ErrorCode = HAL_UART_ERROR_NONE;
}
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