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Jerry_ch701
Joined: 14 Sep 2008
Posts: 1
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| setup_wdt() placement in code |
 Posted: Sun Sep 14, 2008 11:34 pm |
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Why does the setup_wdt command have to be in the while loop, let alone main()?
Does turning on the WDT with setup_wdt(wdt_on) reset it's timer?
| Code: |
#include <12F683.h>
#FUSES NOWDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT, default 4Mhz clock
void main()
{
while(true)
{
output_toggle(pin_A2);
setup_wdt(WDT_1152MS|WDT_TIMES_1|WDT_ON); //Turn on WDT here not in CONFIG
sleep(); //WDT timeout wakes unit and resets WDT timer
}
}
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Jerry |
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Ttelmah
Guest
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| Posted: Mon Sep 15, 2008 3:03 am |
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Answer to first line. It doesn't.
All that is needed, is for this function to be called _once_, before the code that wants the watchdog operating. It can be in the main, or in a subroutine called from the main, ahead of where watchdog functionality is used.
Answer to second, no....
It will clear the counter, if you use WDT_OFF, and then on the next line use WDT_ON. Clearing the SWDTEN bit, resets the counter, but as shown, it won't clear the counter.
Best Wishes |
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