Small problem with using the GPIO to power system ON/OFF

[Simon Bellemare]

Hi, I am really new to the Nordic products and programming for that matters. But, the thing is that I am in somewhat of a hurry. I would like to use a similar code to below to the one below to put my device in system on/off on GPIO inputs. The only problem is that it isn't working for the moment. Can someone please hep me ? Here is my main function :

// Initialize
timers_init();
ble_stack_init();
scheduler_init();
gap_params_init();
advertising_init();
conn_params_init();
sec_params_init();
LEDS_CONFIGURE(LEDS_MASK);

  //Configure Pin P0.00 as an input
	nrf_gpio_cfg_input(0, NRF_GPIO_PIN_PULLDOWN);
	
  //Configure Pin P0.01 in sense mode
	nrf_gpio_cfg_sense_input(1, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);


      // Start execution
      advertising_start();
      sd_ble_gap_tx_power_set(-40);

      // Enter main loop
for (;;)
{
    app_sched_execute();
    power_manage();
		  if (nrf_gpio_pin_read(0) == 1)
			{
				sd_power_system_off();
			}
}

[bjorn-spockeli]

Hi Simon,

I recommend that you take a look at this Github repo, it contains several powerdown examples.'

Best regards

Bjørn

[Simon Bellemare]

Yes, thank you. I did fix the problem I had but I came across another one. I would like to power ON/OFF my device using the same GPIO pin as i would send a logical 1 for power down and a logical 1 for power ON coming from another IC. Is that possible?

[bjorn-spockeli]

Yes, that should be possible as long as you have SENSE enabled on that specific pin. In the GPIO interrupt handler you need to check if you entered it by checking RESETREAS register( it will set one bit to 1 if the chip is woken up from a GPIO pin). In that case you should not re-enter System OFF. If you enter the GPIO interrupt handler and the bit in the RESETREAS is not set, then you should enter System OFF.

[Simon Bellemare]

Thank you!