GPREGRET register at nrf52832 / Who modifies the bits in this register?

[Hauser]

Hey together,

I'm using the GPREGRET register at the nrf52832 to determine how the module should start up after an off mode reset. Thus I set a predefined bit in the GPREGRET, reset the module (using sd_nvic_SystemReset) and check for this bit in the first steps of the startup to determine the supposed operating mode. It works!

As I can see, except of my bit this register is "empty", but I'm wondering whether I am the only one who uses it. Does the softdevice (I'm using S132 nRF52 1.0.0-3.alpha) also uses the GPREGRET and/or can I be sure that I'm the only one who modifies the bits in this register?

I cannot find much information about it.

Thanks for an answer!

[Stefan Birnir Sverrisson]

Hi Hauser

If you use the buttonless DFU service, that service is going to use the GPREGRET register, but I am not aware of anything else using the GPREGRET register. You are therefore free to use this register as you like in your application as long as you do not use the buttonless DFU service.