Receive variable length buffer on UART (Interrupt)

[federico.massimi]

Posted on April 30, 2018 at 18:32

Hello,

in my project I have to receive commands from the serial port (UART), these commands are of variable length and end with carriage return (\r). what I would like to do is generate an interrut when the \r is received and process the received buffer with 'MyCallback'.

looking on the internet I found this solution:

void USART2_IRQHandler(void)
{
 /* USER CODE BEGIN USART2_IRQn 0 */
if(((READ_REG(huart2.Instance->ISR) & USART_ISR_RXNE) != RESET) && ((READ_REG(huart2.Instance->CR1) & USART_CR1_RXNEIE) != RESET)) {
static uint8_t buffer_index = 0;
uint8_t tmp = (uint8_t)((uint16_t) READ_REG(huart2.Instance->RDR) & (uint8_t)huart2.Mask);
if(tmp != '\r' && buffer_index < huart2.RxXferSize) { 
huart2.pRxBuffPtr[buffer_index++] = tmp;
} else{
MyCallback((const char *)huart2.pRxBuffPtr, buffer_index);
buffer_index = 0;
memset(huart2.pRxBuffPtr, NULL_CHAR, huart2.RxXferSize); // clear buffer
}
CLEAR_BIT(READ_REG(huart2.Instance->ISR), USART_ISR_RXNE);
} else {
 /* USER CODE END USART2_IRQn 0 */
 HAL_UART_IRQHandler(&huart2);
 /* USER CODE BEGIN USART2_IRQn 1 */
}
 /* USER CODE END USART2_IRQn 1 */
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at first sight it seems a little complicated, I wanted to ask first if this is the correct way to do what I need and if there are simpler ways to have the same result.

Thanks in advance.