PIC18F wdt timer problem

[vikraml]

Hi all,

I have been playing around with the wdt on the PIC18F4580. The problem I have noticed is that when the fuses for the wdt timer is set and I try to disable the wdt timer using the function setup_wdt(wdt_off), it doesn't make any difference the watchdog timer still continues to reset the processor at the specified time-interval (in this case about 15 sec).

Below is my test code, could someone tell me what I am doing wrong. I basically want to control the start and stop of the watchdog timer within my code.


#include <18F4580.h>
#fuses XT,NOLVP,WDT4096,PUT,NOBROWNOUT
#use delay (clock=4000000)
#include <STDLIB.H>

void main(){
setup_wdt(wdt_off);

while(1){
sleep();
output_toggle(PIN_E0); //CPU HEARTBEAT
}
}

Thanks

[PCM programmer]

Post your compiler version. This is a 4-digit number, such as 3.249,
4.013, 4.045, etc. You can find it at the top of the .LST file, which is
in your project directory. Don't post any numbers that come after the
version number.

[vikraml]

The compiler version is 3.249.


Thanks

[ckielstra]

[vikraml]

ckielstra, thanks for your reply. If that's the case then my next question would be how do I set the timeout for the watchdog timer. The only way I can set the time is thru the fuses (eg. WDT256,WDT512, etc ) since this is a PIC18 or PCH part.


Thanks

[Ttelmah]