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Watchdog as interrupt

kalshagar - Watchdog as interrupt

Watchdog trigger every second sample

This example is working as-is for the Atmega328 or Atmega88 series...
README : must set the fuse WDTON to 0 (inverted logic) to enable the watchdog.
 
#include <avr/interrupt.h>
#include <avr/wdt.h>
 
ISR(WDT_vect){
   //interrupt code : do the job here
}
 
//setup the watchdog to timeout every second and make an interrupt (not a reset!)
void setupWatchdog(){
    //README : must set the fuse WDTON to 0 to enable the watchdog
 
    //disable interrupts
    cli();
 
    //make sure watchdod will be followed by a reset (must set this one to 0 because it resets the WDE bit)
    MCUSR &= ~(1 << WDRF);
    //set up WDT interrupt (from that point one have 4 cycle to modify WDTCSR)
    WDTCSR = (1<<WDCE)|(1<<WDE);
    //Start watchdog timer with 1s prescaller and interrupt only
    WDTCSR = (1<<WDIE)|(0<<WDE)|(1<<WDP2)|(1<<WDP1);
    //Enable global interrupts
    sei();
}
 
void main() {
   setupWatchdog();
 
   //...
}
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electrogeek.cc ~ Formerly known as Kalshagar.wikispaces.com (AlanFromJapan [2009 - 2019])