There is an extra 'else' at the end of UART_DMATransmitCplt function which prevents the HAL_UART_TxCpltCallback to be called in normal (non-circular) mode
[...]
}
/* DMA Circular mode */
else
{
HAL_UART_TxCpltCallback(huart);
}
Compare to UART_DMAReceiveCplt which ends normally with
[...]
}
HAL_UART_RxCpltCallback(huart);
Yes, Jan, you're right.
HAL_UART_TxCpltCallback
() in DMA normal mode will be called after TC interrupt will be raised (this means UART interrupt has to be enabled).It is not a bug : this has been implemented for ensuring that user callback is not executed while last data was still on transmitting (please consider that UART_DMATransmitCplt() is called when DMA has loaded last data in TDR, but data transmission is not completed yet).
Without this check, if in user callback, user wants for example to disable USART block, it might lead to last data not properly transmitted.
Regards
Guenael
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