Posted on September 17, 2014 at 02:45Hi
What I did to achieve this was to modify HAL_UART.C -> UART_Receive_IT() to add a weak callback for every byte. This way you can max out the size and be able to interrogate each byte without reloading the peripheral after every byte received (saving processor time). You can then do whatever you need if you detect a certain character.
snippet:
if(--huart->RxXferCount == 0)
{
__HAL_UART_DISABLE_IT(huart, UART_IT_RXNE);
/* Check if a transmit process is ongoing or not */
if(huart->State == HAL_UART_STATE_BUSY_TX_RX)
{
huart->State = HAL_UART_STATE_BUSY_TX;
}
else
{
/* Disable the UART Parity Error Interrupt */
__HAL_UART_DISABLE_IT(huart, UART_IT_PE);
/* Disable the UART Error Interrupt: (Frame error, noise error, overrun error) */
__HAL_UART_DISABLE_IT(huart, UART_IT_ERR);
huart->State = HAL_UART_STATE_READY;
}
HAL_UART_RxCpltCallback(huart);
}
else
{
HAL_UART_RxByteCallback(huart);
}
return HAL_OK;
}
else
{
return HAL_BUSY;
}
