SYSTEM ON SLEEP : Wake up on gpio interrupt and Timer

[Dinna]

I am using nrf52832, and I want to use SYSTEM ON Sleep.
Also , my wake up sourses are timer based, and also GPIO interrupt based. 
But I observed that the device cannot go to sleep for more than approximately 4 minutes.
Code: 

#define WAKEUP_PIN 17 // Pin number for wakeup button

K_TIMER_DEFINE(my_timer, NULL, NULL);

#define  SLEEP_TIME           K_SECONDS(600) // Define sleep time as 10 seconds

#define  SLEEP_TIMER_START    k_timer_start(&my_timer, SLEEP_TIME, SLEEP_TIME)

#define  SLEEP_TIMER_STOP     k_timer_stop(&my_timer)

void  handle_sleep(void)

{

    char woke_from_gpio = 0;

    printk("Going into the sleep...!!\n\n");

   

    nrf_gpio_cfg_sense_input(WAKEUP_PIN, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

    SLEEP_TIMER_START;

    pm_state_force(0u,&(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0}); 

    __WFI();

    if (nrf_gpio_pin_read(WAKEUP_PIN) == 0)

    {

        woke_from_gpio = 1;

    }

    SLEEP_TIMER_STOP;

    if(woke_from_gpio == 1)

    {

        f.g_Panic_sense_F = 1;

        woke_from_gpio=0;

    }  

}

[Dinna]

Hello,

 
Yes, As you suggested, I tried to use k_timer related functions alone, and the _WFI related issues are not seen anymore.

But, earlier, my device was running on 3uA during sleep(in _WFI).
But after making these changes, the device is taking 6.2uA in sleep. Which is not acceptable, as this is a low power device. 

#define WAKEUP_PIN 17 /

K_TIMER_DEFINE(my_timer, NULL, NULL);

#define  SLEEP_TIME           K_SECONDS(600) 

#define  SLEEP_TIMER_START    k_timer_start(&my_timer, SLEEP_TIME, K_NO_WAIT)

#define  SLEEP_TIMER_STOP     k_timer_stop(&my_timer)

 

void handle_sleep(void)

{

    char woke_from_gpio = 0;

    nrf_gpio_cfg_sense_input(WAKEUP_PIN, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

    SLEEP_TIMER_START; // Start the sleep timer

    pm_state_force(0u,&(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0}); 

    while(1)

    {

        if (k_timer_remaining_get(&my_timer) == 0) {

                break;

        }

        if (nrf_gpio_pin_read(WAKEUP_PIN) == 0)

        {

            woke_from_gpio = 1;

            break;

        }

        k_msleep(100);

    }

    SLEEP_TIMER_STOP;

    if(woke_from_gpio == 1)

    {

        f.g_Panic_sense_F = 1;

        woke_from_gpio=0;

    }  

}

[Håkon Alseth]

Please look at the samples that I shared with you for an event/ISR based approach.

The reason why you are seeing a higher consumption is because you are polling every 100 ms:

Dinna said:

k_msleep(100);

 

Kind regards,

Håkon

[hmolesworth]

You might find this code useful on ascertaining pending interrupts: how-do-i-read-the-event-register