How to check which interrupt has fired now?

vikranthnk — Wed, 25 Apr 2018 11:09:18 GMT

I am using both receive and transmit interrupts, but in my code interrupt handler is only one for both receive and transmit is it right?

Iam using FRDMKE04 dev board, and SDK_2.3.1_FRDM-KE04Z

following is my sample code

#include "board.h"
#include "fsl_uart.h"
#include "pin_mux.h"

void UART0_IRQHandler(void)
{

if(receive interrupt) ///// I need to know this condition

   {
      uint8_t data;
      /* If new data arrived. */
      if ((kUART_RxDataRegFullFlag | kUART_RxOverrunFlag) & UART_GetStatusFlags(UART0))
      {
            data = UART_ReadByte(UART0);
            // Copy the byte into the local FIFO, if it won't cause an overflow
            if(UART_RxBuffer_WritePtr < EUSART_RX_BUFFER_SIZE)
               {
                  UART_RxBuffer[UART_RxBuffer_WritePtr++] = data;

                  if(UART_RxBuffer_WritePtr >= EUSART_RX_BUFFER_SIZE)
               {
                     UART_RxBuffer_WritePtr = 0;
         }

UART_NumBytesInRxBuffer++; /* Update counter */
}

elseif(transimit interrupt is fired) ///// I need to know this condition

{

}

Re: How to check which interrupt has fired now?

mjbcswitzerland — Wed, 25 Apr 2018 17:42:08 GMT

Hi Vikranth

You need to read UART0_S1 to see which interrupt flag is set [UART_S1_TDRE, UART_S1_RDRF, or both].

Regards

Mark

uTasker developer and supporter (+5'000 hours experience on +60 Kinetis derivatives in +80 product developments)

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topic Re: How to check which interrupt has fired now? in Kinetis Microcontrollers

How to check which interrupt has fired now?

Re: How to check which interrupt has fired now?