nRF52832 system powers off and wakes up it

[huaminhtuan]

Hi everyone,

I am developing a remote control using nRF52832 chip. My prototype is currently developed in PC10040 board. The IDE is Eclipse Oxygen, and the SDK is S132 v5.0.0.

I am trying to power off my system using NRF_POWER->SYSTEMOFF = 0x01; when I press a button and then, by pressing that button again, the system will wake up and cause a reset. The problem is when I press the button for the first time, the system seems to reset unstoppable, even when I press the reset button or turn off and then turn on the power again, it is still reset continuosly.

Could you help me please? Thanks

[endnode]

Well we will hardly help you not knowing what exactly you do in your code before you try to send the chip to SYSTEM OFF. E.g. if you are using Nordic BLE stack and Soft Device is enabled you cannot write to these registers directly but use dedicated sd_power_system_off() function as per API description. Note that this isn't magic cure to every problem with SYSTEM OFF mode, you need to take care about initialization/deinitialization of some things (at least that's my experience). Also for wake-up you need to set the PIN specifically. Have you seen the power management example from nRF5 SDK? Can you make your application working in the same way before even using BLE stack (Soft Device)? Only then you should try to achieve the same flow but with BLE stack enabled.

[endnode]

When the system wakes from SYSTEM OFF it will boot like there was a reset but from RESETREAS register you can get the reason and see that it wasn't Power On Reset or other kind of restart. As you initiate UART afterwards during system start-up anyway (if you use it for debug;) then you simply print the same things like during any start-up but if you print that register you can see that it was trigger by button press. Also you can try to read PIN value over GPIO right after reset and print if it's LOW or HIGH (to verify if the trigger came from particular PIN).