Wake up SAMD21 from external interrupt doesn't work

Projects Programming
1

Hi all,

I'am working on a personnal board build with an atsamd21e18a. I'am actually working on sleep mode. I make a function to put samd21 in sleep mode like that. I use RTCZero library.

So in my setup function I've something like this

RTCZero rtc;

void setup(){
    // Set the XOSC32K to run in standby
    SYSCTRL->XOSC32K.bit.RUNSTDBY = 1;
    
    rtc.begin();   
    .... other line code ....
    attachInterrupt(digitalPinToInterrupt(PIN_USER_BUTTON), wakeUpButtonUser, CHANGE);
    ...other line....
}

So in my setup I intialise rtc and I attach an interrupt in my user button. This button is used to power on or power off my board.

My function goTosleep() :

    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
    __DSB();
    __WFI();

In my function wakeUpButtonUser I have a simple if/else statement. If the user pressed the button more than 3 seconds samd21 go to sleep with goToSleep() function, else if it's less than 3 seconds I want wake up the board and light up my led but it's doesn't work.

Here my wakeUpButtonUser function, user_button is object create from C++ for my button.

void wakeUpButtonUser(){
    if (userButton.isPressed())
    {
        userButton.setTimeStartPressed(millis());
        PRINT_DEBUG_LN("Pressed");
    }
    else
    {
        userButton.setTimeEndPressed(millis());
        PRINT_DEBUG_LN("Released");
        uint32_t time_pressed = userButton.getTimePressed();
        if (time_pressed >= temps_on && time_pressed < temps_off)
        {                  
            PRINT_DEBUG_LN("ON");
             //here I have code to light up a led
        }
        else
        {
            PRINT_DEBUG_LN("STOP");
            goSleepMode();
        }
    }
}

This fuction works because if I comment the line `goToSleep(), I can read on my serial ON or OFF depending the time I pressed my button and the led works also because I can light up led before going to sleep. But when my board go to sleep, she's never wake up I don't understand why, I missed something?

3

Ok so maybe I need to use Arduino LowPower here in this example external interrupt is used to wake up samd21 like thaht LowPower.attachInterruptWakeup(pin, repetitionsIncrease, CHANGE);

4

I've tried to use ArduinoLowPower library I have the same issue, I can't wake up my board after calling LowPower.sleep(), I really don't understand any help?

5

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