How to simulate Interrupts in debug mode with PIC18? - c

Question

I tried to debug timer 1 interrupt with MPLAB Simulator, but it seems like the debugger never goes to the interrupt service routine.
The settings for timer 1 seem correct to me , not sure if I missed something else. Here is the datasheet
/*
File: main.c
Date: 2011-SEP-4
Target: PIC18F87J11
IDE: MPLAB 8.76
Compiler: C18 3.40
*/
#include <p18cxxx.h>
#pragma config FOSC = INTOSC, WDTEN = OFF, XINST = OFF
#pragma code HighISR = 0x08 // high priority 0x18
#pragma interrupt HighISR
int time = 0;
void main(void) {
/* set FOSC clock to 8MHZ */
OSCCON = 0b01110000;
/* turn off 4x PLL */
OSCTUNE = 0x00;
/* make all ADC inputs digital I/O */
ANCON0 = 0xFF;
ANCON1 = 0xFF;
// 1/1 prescalar
T1CONbits.T1CKPS1 = 0;
T1CONbits.T1CKPS0 = 0;
// Use Internal Clock
T1CONbits.TMR1CS = 0;
// Timer1 overflow interrupt
PIE1bits.TMR1IE = 1;
// Enable Timer 1
T1CONbits.TMR1ON = 1;
INTCONbits.PEIE = 1; // Enable Perpherial Interrupt
INTCONbits.GIE = 1; // Enable Global Interrupt
while (1);
}
// Timer Interrupt
void HighISR(void) {
if (PIR1bits.TMR1IF == 1) {
time++;
PIR1bits.TMR1IF = 0;
}
}

Answer 1

Just found out what I was missing ...
#pragma code highVector=0x08
void HighVector (void)
{
_asm goto HighISR _endasm
}
#pragma code /* return to default code section */
Now the whole program looks like this
/*
File: main.c
Date: 2011-SEP-4
Target: PIC18F87J11
IDE: MPLAB 8.76
Compiler: C18 3.40
*/
#include <p18cxxx.h>
#pragma config FOSC = INTOSC, WDTEN = OFF, XINST = OFF
#pragma interrupt HighISR
int time = 0;
void main(void) {
/* set FOSC clock to 8MHZ */
OSCCON = 0b01110000;
/* turn off 4x PLL */
OSCTUNE = 0x00;
/* make all ADC inputs digital I/O */
ANCON0 = 0xFF;
ANCON1 = 0xFF;
// 1/1 prescalar
T1CONbits.T1CKPS1 = 0;
T1CONbits.T1CKPS0 = 0;
// Use Internal Clock
T1CONbits.TMR1CS = 0;
// Timer1 overflow interrupt
PIE1bits.TMR1IE = 1;
// Enable Timer 1
T1CONbits.TMR1ON = 1;
INTCONbits.PEIE = 1; // Enable Perpherial Interrupt
INTCONbits.GIE = 1; // Enable Global Interrupt
while (1);
}
#pragma code highVector=0x08
void HighVector (void)
{
_asm goto HighISR _endasm
}
#pragma code /* return to default code section */
// Timer Interrupt
void HighISR(void) {
if (PIR1bits.TMR1IF == 1) {
time++;
PIR1bits.TMR1IF = 0;
}
}