RE: Protecting the battery via sleep mode

Amanda Hsieh — Thu, 17 Feb 2022 14:07:46 GMT

Hi,

Have a look at this one: https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/boards/nrf/system_off. It should also work for nRF9160.

The sample is made to show how to enter the system OFF and how to wake up on a pin event. The modem also needs to be shut down to get the power consumption to go down.

For wake up, see https://github.com/nrfconnect/sdk-zephyr/blob/a4edab554f67590a89703067af703c7996604562/samples/boards/nrf/system_off/src/main.c#L61-64 :

nrf_gpio_cfg_input(DT_GPIO_PIN(DT_NODELABEL(button0), gpios), NRF_GPIO_PIN_PULLUP);
nrf_gpio_cfg_sense_set(DT_GPIO_PIN(DT_NODELABEL(button0), gpios), NRF_GPIO_PIN_SENSE_LOW);

Note that it's using the sense_set function. GPIO wakeup from system OFF uses the GPIO SENSE event while normally in system ON idle, gpio interrupt is generated by GPIOTE IN event, but that does not work in system OFF. The wakeup pin has to be configured with the correct settings. The gpio_pin_interrupt_configure() you used will not work because that uses the GPIOTE IN event.

Regards,
Amanda