Behaviour of HAL_UART_ErrorCallback

[Andrew Neil]

It seems that, if an error occurs on the last (or only) byte of a HAL_UART_Receive_IT transfer, the HAL_UART_ErrorCallback will not be called until after the HAL_UART_RxCpltCallback - is that right?

STM32F0 Cube package.

[STea]

Hello @Andrew Neil ,

can you give us the reason behind this conclusion was it found by testing, or this was concluded after the examination of HAL implementation?

Regards

[Andrew Neil]

Both - started by looking at the code, then tested

[STea]

Hello @Andrew Neil ,

From a Hardware point of view, I think booth events are not related:

but in the HAL implementation the enable of the UART Error Interrupt: (Frame error, noise error, overrun error) is inside the UART_Start_Receive_IT maybe try to set this bit before entering the interrupt and you should be able to detect errors once the HAL_UART_IRQHandler is called we test if error accrued if this bit set and not cleared this on the entry of the function :

if ((errorflags != 0U)
 && (((cr3its & USART_CR3_EIE) != 0U)
 || ((cr1its & (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR1_RTOIE)) != 0U)))

Regards

[Pavel A.]

>I'll have to make an example ...

Sure enough. No good deed goes unpunished.