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WDT

 
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carl



Joined: 06 Feb 2008
Posts: 240
Location: Chester

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WDT
PostPosted: Fri Jul 31, 2015 6:31 am     Reply with quote
Hi all,

Hope you can help. Some pre-requisites:
Compiler Version 4.141
Using 16f877
Using MPLAB (in release mode, WTD enabled in settings).


I have never used the WDT function ever - always tried to steer clear of it.
But I am going to need it for a particular project.

Basically I have started with a simple program below, but it doesn't work.
On initialisation the LED should flash for 2s, and then go into the while loop () and flash every 0.2s. It makes no difference if 'reset_wdt' line is there or not, so it must not be even starting/working.

The LED just keeps flashing at 0.2s intervals, whereas it should reset back to 2s when the reset_wdt line is commented out.

the code:
Code:
#include "16f877.h"

#fuses XT, NOPROTECT, NOPUT, NOBROWNOUT, NOLVP, WDT,
#use delay(clock=4000000, RESTART_WDT)

#include "M300107.h"  //pin assignments

void main(){

  setup_wdt(WDT_2304MS);

  output_low( RUN_LED ); // turn on RUN LED
  delay_ms(2000);
  output_high( RUN_LED ); // turn off RUN LED
  delay_ms(2000);

  while (true){
  output_low( RUN_LED );
  delay_ms(200);
  output_high( RUN_LED );
  delay_ms(200);
//  restart_wdt();
}
}


Any help would be much appreciated.
Carl
drh



Joined: 12 Jul 2004
Posts: 192
Location: Hemet, California USA

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PostPosted: Fri Jul 31, 2015 7:40 am     Reply with quote
Quote:
#use delay(clock=4000000, RESTART_WDT)


This will restart the WDT in the delay routine. Remove it and try again.
_________________
David
carl



Joined: 06 Feb 2008
Posts: 240
Location: Chester

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PostPosted: Fri Jul 31, 2015 8:29 am     Reply with quote
Excellent,

All working as it should:)

Much appreciated.
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