sd_power_system_off() interfere with GPIOTE port interrupts

[Mindaugas Tinteris]

I am using NRF52 SDK14.0 and SoftDevice S132 v5.0.0. I am using GPIOTE low level port interrupt to wake the system from SysOff mode. If SoftDevice is enabled and I put the system to SysOff by calling NRF_POWER->SYSTEMOFF = POWER_SYSTEMOFF_SYSTEMOFF_Enter; port interrupt (button press) wakes the system as expected. But if I am trying to use sd_power_system_off() function instead, the system goes to SysOff and is never woken again by the port interrupt. Could something inside sd_power_system_off() interfere with GPIOTE interrupt settings?

[Sigurd]

Hi,

When in System OFF mode, the device can be woken up through one of the following signals:

1. The DETECT signal, optionally generated by the GPIO peripheral
2. The ANADETECT signal, optionally generated by the LPCOMP module
3. The SENSE signal, optionally generated by the NFC module to “wake-on-field”
4. A reset

GPIOTE will not wake the processor up from SYSTEM OFF, the sense mechanism in the GPIO peripheral will. If you enable the sense mechanism, a DETECT signal will be generated if the correct sense is detected on one of the pins.

Try to configure the pin you want to use to wake the chip up like this:

nrf_gpio_cfg_sense_input(PIN NUMBER, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

Also note that when the SoftDevice is enabled, the POWER register is restricted, and should not be accessed directly. When the SoftDevice is enabled, you should therefore only use the sd_power_system_off() function to go to sleep.

[Mindaugas Tinteris]

GPIO_BUTTON_MAIN is 20. Yes I checked, NRF_P0->PIN_CNF[GPIO_BUTTON_MAIN] is indeed 0x0003000C. I'll add one important thing to the whole story: I call sd_power_system_off() from FreeRTOS idle task hook. Afte looking more carefully I discovered, that system goes to Hard Fault Handler after calling sd_power_system_off() and it seems to me that I can find the answer to this here. Now it's only unclear, how to change IDLE task interrupt priority level in FreeRTOS. Any hints would be appreciated.