Newbie Help w/ TMR0

[doggitz]

Using an 18F4620 with PICKIT 2 programmer. Trying to flash LED on port c0 as part of an interrupt routine. Have scoured microchip and CCS manuals and cannot figure out why this does not run. In debug, the timer never starts and the interrupt routine is never called. I have added a "flag" variable (j) to let me know if the interrupt gets called. I look at these in the "watch" window in mplab. I have added 'm" to see if the timer ever starts and it never does. I have preloaded TMR0 with 50. HELP!! why does TMR0 never start?

#include <18F4620.H>
#use delay (clock = 10MHz)

int i = 0;
int j = 0;

#INT_TIMER0 //format for rtcc isr - defined by compiler
clock_isr()

{
j = j++;
if (i==0)
{
output_high(pin_c0);
i = 1;
}
else
{
output_low(pin_c0);
i = 0;
}
}

void main(void)
{
while (1==1)
{
long m = 0;
setup_timer_0 (RTCC_INTERNAL | RTCC_DIV_128);
enable_interrupts (int_timer0);
enable_interrupts (GLOBAL);
set_timer0(50);
m = get_timer0();
}
}

[ckielstra]

What is your compiler version number?

Have you configured #fuses? If no, then that is your problem. If yes, then please post them.

Next time, use the 'code' buttons when posting code. This ensures the formatting is preserved and makes for easier reading.

In situations like this make the code easier until the PIC is working again. The last step before making it working again will be your problem. For example, have you tried running your code without an interrupt?

Something completely different, but the code:

[doggitz]

I have not set fuses. I will look to see what I might have missed.Compiler is version 4.124

[adi1133]

An interrupt is triggered when timer0 overflows (after 255).
You dont allow it to rise to 255 because you set it to 50 each time in the while loop.

Remove "set_timer0(50);" from the loop.
Also there is no reason to set up timer0 each time you execute the loop.

Here is an simplified example of the code

[doggitz]

That worked- thanks