WDT Help

Projects Programming
1

Hello,

I have been trying to get something working most of the weekend but no joy.

I want to put my system to sleep, to save power, but I think the best thing to do might be to use the WDT, and maybe wake up every second or so, and see if I am receiving information on an analog pin from a FSR.

So far I have

#include <avr/wdt.h>

void setup()
{
  Serial.begin(9600);
  
}

void wdtSetup(void)
{
  cli();          //Disable all interrupts
  wdt_reset();    //Reset the WDT
  /*
  WDTCSR configuration
  WDIE = 1: Interrupt enable
  WDE = 1: Reset enable
  WDP3:1 = '0110': 1 sec time-out
  */
  
  //Enter WDT config mode
  WDTCSR |= (1<<WDCE) | (1<<WDE);
  //WDT Settings
  WDTCSR = (1<<WDIE)|(1<<WDE)|(0<<WDP3)|
            (1<<WDP2)|(1<<WDP1)|(0<<WDP0);
       
   sei();  
}

void loop()
{
  Serial.println("...");
}

I got help with this code from searching the site here. But now I am kinda stuck. I am not sure who I actually get the WDT going! Do I need to call a sleep function and then the WDT will wake up every second? Also, when I don't want the system to sleep (i.e. when it is receiving data) do I disable interrupts?

I really am just stumbling around in the dark here, so if someone has a flashlight, that would be great!! (Man, that was a crap analogy, sorry!).

Thanks in advance.

Seán

2

Wait, is this all I need??

wdt_enable(WDT0_1S);

Because if it is, that would make life easier.

Seán