HELP! PIC18F452 RB port change interrupt

[boonthiam89]

Guys. I would like to initiate an interrupt caused by changes of Port RB7. The following code is written by me and the LED cannot light once the state of Port RB7 is changed. I am using microC pro in programming. The RBIF is actually used read the position of motor using the quadrature encoder attached to the motor. So, there will be 2 RB ports used and interrupt will be induced if either of the RB ports changes their state.

#define LED1 PortA.F7

void interrupt(){
if(INTCON.RBIF==1)
{
LED1=1;
delay_ms(500);
LED1=0;
INTCON.RBIF=0;
}
}
void main ()
{
TRISA = 0;
TRISB = 0b10000000;
INTCON = 0b01001000;
while (1)
{

}
}

[Hollowaykeanho]

hi boonthiam89,

LED1 PortA.F7

Not sure in MicroC but F7? Perhaps maybe A7 or RA7?

INTCON = 0b01001000;

bit-8 must be 1 (Global Interrupts Enable Bit --GIE). Something like: 0b11001000. Refer datasheet for settings.

[sich]

Hi Hollowaykeanho, good to see another problem solver here in this forum Welcome!