PIC16F676 can't get the WDT to wake it back up

[RandyI]

Hello,

CCS PCM C Compiler, Version 3.218

I believe my WDT is not active even though I believe it is set. I can get the device to sleep, but the WDT does not wake it up. When I stop the debugger, I get an error message "Could not run program: The target was not haulted", which I assume happens because the micro is in sleep mode. If I mask the sleep command, and unmask the 500ms time delay, the program works. I just want the micro to sleep for the duration of the WDT, and wake up. Attached is the simplified code...Any ideas on what I'm doing wrong? Thanks for any input you can provide!!!

PROGRAM:

#include <prototype s.h>

#define low_voltage 268
#define high_voltage 403


CHECK_VOLTAGE();
long reading;


void main() {


setup_adc_ports(sAN0|sAN1|sAN2|sAN3|sAN4|sAN5|sAN6|sAN7|VSS_VDD);
setup_adc(adc_clock_internal);

setup_timer_0(RTCC_INTERNAL);
setup_wdt(WDT_1152MS);


while (true) {



output_high(charge_FET); //turn on charge FET
output_high(discharge_FET); //turn on discharge FET
delay_ms(30);

set_adc_channel(7);
CHECK_VOLTAGE();

// delay_ms(500); // remove "//" on this line and block the sleep command. The code works


sleep();

}
}


CHECK_VOLTAGE() {


reading = read_adc();

if(reading < low_voltage)
{
output_low(charge_FET); //turn off charge FET
output_low(discharge_FET); //turn off discharge FET
}

else if (reading > high_voltage)
{
output_low(charge_FET); //turn off charge FET
output_low(discharge_FET); //turn off discharge FET
}

else
{
output_high(charge_FET); //turn on charge FET
output_high(discharge_FET); //turn on discharge FET
}
}

phototype s.h file:

#include <16f676 s.h>
#device ICD=TRUE
#device adc=10

#fuses INTRC_IO,NOPROTECT,NOBROWNOUT,NOMCLR,NOCPD,PUT,WDT

#ROM 0x3ff = {0x3480} //use as last resort to restore cal. data

#use delay (clock=4000000)



#define charge_FET pin_C4
#define discharge_FET pin_C5
_________________
Thank you!
Randy:)

CCS PCM C Compiler, Version 3.218

[Mark]

The WDT cannot be enabled with the debugger! It won't let you.

[Guest]

Thanks Mark!

So, I if I understand you correctly, I'll need to test this feature using a real device while monitoring the device current to make sure it is is in sleep mode?

Thanks!

[Mark]

Yep.