Idle does not work with Timer0

Projects Programming
1

Hey,
I am just trying to low the energy consumption of my arduino and so I installed the LowPower(.h) library.
I need to use the Timer0 because I wanna create some kind of a watch. And there comes the problem: if I use "LowPower.idle(SLEEP_1S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF, SPI_OFF, USART0_OFF, TWI_OFF); " everything is allright but if I set the TIMER0 ON (because of my watch application with time.h) the controller does not sleep for 1 second.
The simplest programm I could imagine to show my problem is a modified blink:

that works:
#include <LowPower.h>
/
int led = 13;

void setup() {
pinMode(led, OUTPUT);
}

void loop() {
digitalWrite(led, HIGH);
LowPower.idle(SLEEP_1S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF,
SPI_OFF, USART0_OFF, TWI_OFF);
digitalWrite(led, LOW);
LowPower.idle(SLEEP_1S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_OFF,
SPI_OFF, USART0_OFF, TWI_OFF);
}

that not:

#include <LowPower.h>
/
int led = 13;

void setup() {
pinMode(led, OUTPUT);
}

void loop() {
digitalWrite(led, HIGH);
LowPower.idle(SLEEP_1S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_ON,
SPI_OFF, USART0_OFF, TWI_OFF);
digitalWrite(led, LOW);
LowPower.idle(SLEEP_1S, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_ON,
SPI_OFF, USART0_OFF, TWI_OFF);
}

What can I do to let both run together? Is there a connection between sleep and timer0???

THX
Jonny

2

sry guys, is there no answer for me????

3

If you leave timer0 on it will interrupt every 1.024ms, which might be the issue?

4

Just to get you right: you think my timer gets an overflow and because of that the interupt awakes my idle?
but is there a oportunity to solve my problem?

EDIT: interrupts(); and noInterrupts(); before and after my idle task is not running :~

5

timer0 is configured to interrupt every 1.024ms, that's how millis(), micros() and delay() work.

6

okay, but how to handle that problem now?
I need timer0 because of my real time application with time.h

Is there a way to tell time.h to work with timer1?

7

You just need to switch off timer0 interrupts before sleeping and turn them on again
afterwards, perhaps?

  TIMSK0 = 0 ;   // timer 0 all interrupts disabled
  TIMSK0 = 0x1 ;   // timer 0 overflow interrupts enabled
8

I already tried this one too, but couldn't fix it with TIMSK

I am that desperate, that I am thinking about using a real time clock which works even if the arduino is in powerdown mode (like that one from China: http://www.ebay.de/itm/DS1302-Real-Time-Clock-Module-mit-CR2032-3V-Batterie-fur-Arduino-NEU-/191136140796?pt=Wissenschaftliche_Geräte&hash=item2c809a0dfc) but i don't know if this is the best alternative...

9

Is there a way to tell time.h to work with timer1?

No, because time.h doesn't do anything directly with timers. It relies on millis() operating correctly.