WakeUp from sleep mode

[Constantin]

Hi,

we try to get the NRF52840 to sleep and then wake up from an GPIO interrupt.

We try it in debug mode which should give a emulated sleep mode. So we stop all processing and at a while(1) loop after calling sd_power_system_off.

The wakeup pin is configured as followed:

	nrf_gpio_cfg_input(IMU_INT2, NRF_GPIO_PIN_NOPULL);
	nrf_gpio_cfg_sense_set(IMU_INT2, NRF_GPIO_PIN_SENSE_HIGH);

Prior to setting the nrf to sleep the interrupt is firing and working as expected. And I can see the interrupt going high and low again when the nrf should be in sleep

but it does not produce a reset. Some other information the device is running with USB powered and usb_handling enabled and debugger disconnected.

I've already tried to uncomment the USB stuff and run it without USB but still no progress.
Help is appreciated ;-).

Kind regards,

C.W.

PS: SDK is 17.0.0

[Simonr]

Hi Constantin

You need to call sd_ble_gap_adv_stop() before going to sleep with sd_power_system_off(). Please also add a small delay or a check to make sure that sd_ble_gap_adv_stop() is finished before calling sd_power_system_off() to avoid these crashes. You need to do this because advertising needs to be stopped/closed properly before going to sleep.

Best regards,

Simon

[Constantin]

Hi Simon,

don't you think this might be good to document in the SDK description?
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.s140.api.v7.2.0%2Fgroup___n_r_f___s_o_c___f_u_n_c_t_i_o_n_s.html&cp=4_7_4_1_2_7_2_26&anchor=ga774947ee0e200456ea3aec3fc7f8bd6b

I could not find any hint? Kind regards,

Constantin