LPUART1 RX Interrupt

[farid_mabrouk]

I configured an RX interrupt for LPUART1 as below. However, I am seeing that interrupt occurs only once even though data keeps coming to the every seconds. It appears the interrupt is disabled once the my buffer is full? but I tried to enable it after every read and still could not have it trigger again. Any comments please!

void LPUART1_IRQHandler(void)
{
    uint8_t data;

    /* If new data arrived. */
    if ((kLPUART_RxDataRegFullFlag)&LPUART_GetStatusFlags(LPUART1))
    {
        data = LPUART_ReadByte(LPUART1);

        BarCodeRxBuff[rxIndex] = data;
        rxIndex++;
        if(rxIndex==BUFFER_SIZE)  //buff size is 9
        {
          rxIndex=0;
          BufferFull=true;

        }

    }

[mjbcswitzerland]

Hi

Reading a received byte clears the reception interrupt flag and so there is nothing else to be done with respect to this.

However, if you have a receiver overrun or other type of reception error you need to explicitly handle these and clear the status (usually by writing a '1' to the flag in the status register after having read it being set) otherwise the receiver will not receive anything else. Therefore, check the error flags to see whether your problem is due to one of these being set.

Regards

Mark

[uTasker project developer for Kinetis and i.MX RT]