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[SOLVED] Interrupt from the match of PR2 and TMR2

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Franck84

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Hi,
my name is Franck. I have got a problem with my code. Basically the program is not going to the interrupt routine when PR2 and TMR2 match. That will be great if someone can help me on that. I have no idea what can be wrong. On the mplab watch window I can observe the flag on TMR2IF when PR2 equals TMR2 following by the reset of TMR2. But impossible to see the increment of "count"
Thanks
Here is my code: 
Code C - [expand]
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#include <p18f4610.h> 
#include<stdio.h> 
#include<delays.h> 
#include<timers.h> 
#pragma config WDT=OFF , OSC=HS , PWRT = ON, LVP=OFF 
#pragma interrupt isr 
int count=0; 
void isr(void) 
{ 
if(PIR1bits.TMR2IF==1) 
{ 
 
count=count++; 
PORTAbits.RA0=1; 
} 
PIR1bits.TMR2IF=0; 
} 
 
void main (void) 
{ 
 
//T2CON=0x7F; 
T2CONbits.T2OUTPS0=0; 
T2CONbits.T2OUTPS1=0; 
T2CONbits.T2OUTPS2=0; 
T2CONbits.T2OUTPS3=0; 
T2CONbits.TMR2ON=1; // turn on the timer2 
T2CONbits.T2CKPS0=1; 
T2CONbits.T2CKPS0=1; 
PR2= 100; 
PIE1bits.TMR2IE=1; //Enable TIMER2 Interrupt 
INTCONbits.PEIE=1; //Enable Peripheral Interrupt 
INTCONbits.GIE=1; //Enable INTs globally 
}

PS: I am using MPLAB v8.60, C18 compiler
 
Last edited by a moderator:

Use this code:
Code: 
#include <p18f4610.h> 
#include<stdio.h> 
#include<delays.h> 
#include<timers.h> 
#pragma config WDT=OFF , OSC=HS , PWRT = ON, LVP=OFF 
int count=0; 
void interrupt_at_high_vector(void);
void high_isr(void);

#pragma code high_vector=0x08
void interrupt_at_high_vector(void)
{
  _asm GOTO high_isr _endasm
}
#pragma code /* return to the default code section */
#pragma interrupt high_isr
void high_isr(void)
{
if(PIR1bits.TMR2IF==1) 
{ 
 
count=count++; 
PORTAbits.RA0=1; 
} 
PIR1bits.TMR2IF=0; 
}
 
void main (void) 
{ 
 
//T2CON=0x7F; 
TRISA = 0;
CMCON = 7;
ADCON1 = 7;
T2CONbits.T2OUTPS0=0; 
T2CONbits.T2OUTPS1=0; 
T2CONbits.T2OUTPS2=0; 
T2CONbits.T2OUTPS3=0; 
T2CONbits.TMR2ON=1; // turn on the timer2 
T2CONbits.T2CKPS0=1; 
T2CONbits.T2CKPS0=1; 
PR2= 100; 
PIE1bits.TMR2IE=1; //Enable TIMER2 Interrupt 
INTCONbits.PEIE=1; //Enable Peripheral Interrupt 
INTCONbits.GIE=1; //Enable INTs globally 
while(1);
}

Hope this helps.
Tahmid.
 

Thanks Tahmid. I just found out . That is exactly the way to do it. Thanks again
 

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