Simple external interrupt program (SOLVED)

[pepper]

I am new to mikroC and have encountered some problems. I want to enable three external interrupts from three push buttons but i am pretty lost. I am using a pic32mz chip.
I tried this code for one push button which after some playing around to enable an interrupt from F8 but to no avail.

Code: Select all

int flag=0;
void main(){
ANSELA=0;
ANSELF=0;
TRISA=0;
LATA=0xFF;
TRISF8_bit=1;         //button input

  Unlock_IOLOCK();
  PPS_Mapping(58, _INPUT, _INT1);
//RPINR0bits.INT1R = 58;
  Lock_IOLOCK();
  IFS0bits.INT1IF=0;     //clear interrupt flag
  INTCONbits.INT1EP=0;   //interrupt edge
  IPC2bits.INT1IP=1;     //interrupt priority
  IEC0bits.INT1IE=1;     //enable external interrupt
   EnableInterrupts();
               while(1){
                if (flag==1){
                flag=0;
                LATA=~PORTA;
                }
               }
}

 void EXT_INT1() iv IVT_EXTERNAL_1 ics ICS_AUTO
{
   flag=1;
   IFS0.INT1IF =0;
}

What am i doing wrong?

thanks

[filip]

Hi,

First of all, are you sure that your button is working correctly ?
Did you try debugging your code without the interrupt, just by polling the PORT register ?

Regards,
Filip.

[pepper]

I tested the button and it works with the button library but not with the above interrupt code.

[marcelocrr]

Pepper,

Try PPS_MAPPING(_RPF8, _INPUT, _INT1) instead of PPS_MAPPING(58, _INPUT, _INT1)

Regards,
Marcelo Rilko.

[pepper]

Unfortunately, i have already tried that. I changed the code a bit but i had no success.

Code: Select all

  Unlock_IOLOCK();
  PPS_Mapping(_RPF8, _INPUT, _INT1);
//RPINR0bits.INT1R = 58;
  Lock_IOLOCK();

  IFS0.INT1IF=0;     //clear interrupt flag
  INTCON.INT1EP=0;   //interrupt edge
  //IPC2.INT1IP=1;     //interrupt priority
  IEC0.INT1IE=1;     //enable external interrupt

Also when i write the line

Code: Select all

IPC2.INT1IP=1;     //interrupt priority

it fails to compile. Any ideas?
I'm using a pic32mz.

[marcelocrr]

Pepper,

What's the P/N of the MCU?

Marcelo Rilko

[pepper]

It's pic32mz2048efh100

[JairHdez]

You can't use the F8 pin with the external interrupt 1. In the datasheet (http://ww1.microchip.com/downloads/en/D ... 01320D.pdf) page 252 shows which pins can be used as external interrupt.

[marcelocrr]

Yes, you must use int2 with rf8. See datasheet pag. 251.

Marcelo Rilko

[pepper]

Alright, thanks a lot for that. But i still can't get it to work with theses changes...

Code: Select all

int flag=0;
void main(){
ANSELA=0;
ANSELF=0;
TRISA=0;
LATA=0;
TRISF=1;         //button input

  Unlock_IOLOCK();
  PPS_Mapping(_RPF8, _INPUT, _INT2);
//RPINR0bits.INT1R = 58;
  Lock_IOLOCK();

  IFS0.INT2IF=0;     //clear interrupt flag
  INTCON.INT2EP=0;   //interrupt edge
  IPC3bits.INT2IP=1;     //interrupt priority
  IEC0.INT2IE=1;     //enable external interrupt

   EnableInterrupts();
               while(1){
                if (flag==1){
                flag=0;
                LATA=~PORTA;
                }
               }
}

 void EXT_INT2() iv IVT_EXTERNAL_2 ics ICS_AUTO
{
   flag=1;
   IFS0.INT2IF=0;
}

[JairHdez]

try INT2R = 0x0B; instead of

Code: Select all

Unlock_IOLOCK();
  PPS_Mapping(_RPF8, _INPUT, _INT2);
//RPINR0bits.INT1R = 58;
  Lock_IOLOCK();

[pepper]

I found the error. I didn't initialise F8 as input properly.

Code: Select all

TRISF=0x100;

is the correct way to do it.

thanks