Portb_interrupt+ccs compiler

Portb interrupt works onr time only.....after that i clear that interrupt flag.......but it does not work.....
Can anyone help me?

manikandanshine said:

Portb interrupt works onr time only.....after that i clear that interrupt flag.......but it does not work

Click to expand...

You must first read PORTB to clear the mismatch condition then clear the interrupt flag.

Ensure that you informed the processor about the Intterrupt flag is cleared.
For example
void interrupt()
{
VICVectAddrr=0;
}

You will it will generate the interrupt for every time.

manikandanshine said:

Portb interrupt works onr time only.....after that i clear that interrupt flag.......but it does not work.....
Can anyone help me?

Click to expand...

Hello manikandanshine, for clarity which micro are you using, and can you upload the portion of code that has the problem?

Greetings!

There are a couple of things to check here:

1- As 'zuisti' said Portb should be read before enabling the interrupt again, check if the flag keeps getting set or not, if it's getting set then you're not reading Portb,
2- The interrupt might be getting disabled somehow, or the 'GIE' bit,
3- Rest of the code runs as intended or not.

Hello guys, everything you say is true, but if we are talking about programming with the CCS compiler, as says the title of the thread, this compiler is internally responsible of doing all of that. That is why it would be good to see the code manikandanshine is using, as well as the PIC he is using.

Greetings!

#include <16f876.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP,BROWNOUT,PUT
#use delay(clock=4000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7)
/////////////////////////////Working Vars//////////////////////////////////////
int16 counter=0;
int1 ina=0,inb=0,PLast=0;
/////////////////////////////////////////
#INT_RB
void rb_isr(void){

ina=input(pin_b4);
inb=input(pin_b5);
///////////////////////////////////////////
if((PLast==0)&&(ina==1)){
if(inb==0){counter--;}
else {counter++;}
}
PLast = ina;
printf("Encoder = %05Ld \r",counter);
}
////////////////////////////////////////////////////////////////////////////////
void main(void) {

set_tris_a (0b00000001);
set_tris_b (0b11110001);
set_tris_c (0b10000001);
setup_adc_ports(NO_ANALOGS);
enable_interrupts(INT_RB);
enable_interrupts(GLOBAL);
printf("\rRotary Encoder Test\r");
delay_ms(500);
///////////////////////////////////////////
while (true){

}
}