System Off and GPIOTE

Question

I have multiple GPIOs that are configured to use GPIOTE in my application. When one of these GPIOs is in the active state I start timer. Once the timer expires I want to enter system off using sd_power_system_off() and I want the GPIO that started the timer to wakeup the system. 
 Do I need to disable the GPIOTE events for this pin before calling nrf_gpio_cfg_sense_set() ? 
 What about peripherals and interrupts? Do peripherals need to be stopped and interrupts disabled before calling sd_power_system_off() ? 
 Thanks,
Darren

Ole Bauck · Accepted Answer

Hi, 
 You should not need to disable the GPIOTE events for that pin. The only peripherals that are partially kept active in SYSTEM OFF are GPIO , LPCOMP and NFC . Remember that the nrf_gpio_cfg_sense_set() function only sets the SENSE field of the pin so the other fields (direction, pull etc) will be the same. nrf_gpio_cfg_sense_input() will set all fields. 
 Other peripherals are not functional in SYSTEM OFF and are reset when the device wakes up after SYSTEM OFF, see here . So there is no need to stop the peripherals and disable interrupts before going to SYSTEM OFF. 
 Ole

System Off and GPIOTE

Top Replies

core_v2_widget.Hide()