Interrupt handling RB0/INT

[myj]

Hi all,

Im having problem with my code. i am using mikroC compiler and PIC16F877A Microcontroller.
I incorporate external interrupt RB0/INT as input as i simulated thru the use of PROTEUS the interrupt does not occur. See please my code and have a solution for my problem.

main(){
unsigned int gCOUNT;
TRISB = 0x01;
TRISA = 0x00;

INTCON.GIE = 1; //Enable Global Interrupt
INTCON.INTE = 1; //Enable RB0/INT external Interrupt
INTCON.PEIE = 0; //Disable all unmasked peripheral interrupt
OPTION_REG.INTEDG = 1; //Interrupt on rising edge

if(INTCON.INTF == 1){++gCOUNT;}

}

Thanks,
joenil

 

[m_saeed_soliman]

please take a look at the MikroC for PIc help manual.
Search for "Interrupt" and youi will find information on how to handle inteeupt.
Regards,

 

[Tahmid]

Hi,
This is the fixed code:

unsigned int gCOUNT;

void interrupt(void){ //Interrupts must be handled through subroutine like this
     ++gCOUNT;
     INTCON.INTF = 0; //You HAVE to clear interrupt flag
}

void main(void){
    TRISB = 0x01;
    TRISA = 0x00;

    INTCON.GIE = 1; //Enable Global Interrupt
    INTCON.INTE = 1; //Enable RB0/INT external Interrupt
    INTCON.PEIE = 0; //Disable all unmasked peripheral interrupt
    OPTION_REG.INTEDG = 1; //Interrupt on rising edge

    do{ //Repeat endlesssly
    }while(1);
}

Interrupt has to be handled through subroutine as shown. Remember you HAVE to clear interrupt flag in the ISR - Interrupt Service Routine, or that will continue going on. Hope you can understand the code and the mistakes you made.

Hope this helps.
Tahmid.