LowPower.idle(IDLE_2); doesn't do anything

[boggydew]

Hi, I cant get LowPower.idle(IDLE_2); to work for Arduino Zero.

See my simple code below that flashes a LED. The data sheet for SAMD21 says that in idle mode the CPU stops, but my code keeps running, ie LED keeps flashing. If I replace LowPower.idle(IDLE_2); with LowPower.standby(); the CPU stops but not with idle. Why?

Thanks.

#include “LowPower.h”
void setup() {
pinMode(26, OUTPUT);
}

void loop()
{
LowPower.idle(IDLE_2);

digitalWrite(26, LOW);
delay(500);
digitalWrite(26, HIGH);
delay(500);
}

[LIM PHANG MOH]

I doubt that you can even compile it at the first place.
The idle function call doesn’t exist for SAMD21 core. It is only available for the AVR variant.

[boggydew]

Hi,

No, it is definitely intended for the SAMD21, see code from LowPower.h below:
#if defined (__SAMD21G18A__)
void idle(idle_t idleMode);
void standby();
#else
#error “Please ensure chosen MCU is ATSAMD21G18A.”
#endif

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