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Waking from two int sources (watchdog and external INT)
Hello,
I am using Atmega328 in SLEEP_MODE_PWR_DOWN with two INT sources for waking up. I need to wake up aperiodically (external INT from a sensor device) and periodically (watchdog 8 s timeout interrupt). I’m having problems setting this up. If I use only one wake-up INT source (sensor) everything works great.
However, if I use the watchdog as well, sometimes when a sensor INT wakes the ATmega, the code after sleep_cpu(); command executes multiple times. Sometimes means e.g. 20% of the time.Besides this issue, I am worried about one more thing. If a sensor ext. interrupt occurs- I want to run time critical code and therefore disable the watchdog INT (let’s say that I’m not worried about messing up my wdog wake period) and enable it again before going to sleep. Where should I call my watchdog disable function?
Here is my sleepNow function:
Code:void sleepNow()
{
cli();
detachInterrupt(1);
attachInterrupt(1,wakeUpNow, LOW);
//myWatchdogEnable();
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
if (1)
{
sleep_enable();
sei();
sleep_cpu();
Serial.println(“a0″);
sleep_disable();
Serial.println(“a1″);
}
Serial.print(“Testpoint”);
sei();
}and my sensor wakeup ISR:
Code:
void wakeUpNow()
{
stanje= PROBUDIO_AKC;
cli();
detachInterrupt(1);
// myWatchdogDisable();
}Thank you for any advice
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