interrupt problem

[Tong]

hi every one, i am actually using the Mikroc as my compiler, and now i am doing the receive UART interrupt. however i just manage to jump to ISR but does any one know how to return from the ISR? Previously i use the hardware interrupt which just clear the INTCON.INTF bit then it will return, yet this time the UART interrupt i clear the PIR1.RCIF and RCREG, it wont work, i really dont know what happen? thanks in advance for the helping hand.

 

[Ian Rogers]

The RCIF flag is cleared automatically when you read the RCREG ... you need just the return.

 

[Jon Wilder]

Try this -

unsigned char RXDATA;

void interrupt isr (void)
{
         if (PIR1.RCIF)
         {
                RXDATA = RCREG;
         }

}

Placing the received data from RCREG into variable RXDATA should clear the RCIF flag.