I can read "NRF_POWER->RESETREAS" in code, but I can't with nrfjprog

RE: I can read "NRF_POWER->RESETREAS" in code, but I can't with nrfjprog

Jeong Hyun Seok — Mon, 07 Nov 2016 23:51:21 GMT

You are right! Why I did not think of breakpoint? I checked Power Register in keil and checked when register value change.

My colleague put clear code below somewhere.

Thank you. it helped a lot. :-)

RE: I can read "NRF_POWER->RESETREAS" in code, but I can't with nrfjprog

Susheel Nuguru — Mon, 07 Nov 2016 09:16:31 GMT

I am pretty sure that some part of your code is clearing the register. Can you please upload your test code and tell me the laser marking of the chip so that i can test it on my desk.

RE: I can read "NRF_POWER->RESETREAS" in code, but I can't with nrfjprog

Jeong Hyun Seok — Fri, 04 Nov 2016 16:51:45 GMT

Sorry for confusion. But I actually did not used that line while I tested

so my test was like this

reset_reason = NRF_POWER->RESETREAS;
NRF_LOG_PRINTF("reset_reason: 0x%08x.\n",reset_reason );
//NRF_POWER->RESETREAS = 0xffffffff;

RE: I can read "NRF_POWER->RESETREAS" in code, but I can't with nrfjprog

Susheel Nuguru — Fri, 04 Nov 2016 09:32:25 GMT

That is because you are explicitly clearing the register in your program after you printed it.

NRF_POWER->RESETREAS = 0xffffffff;

This will clear the register before you get a chance to read from nrfjprog. Comment this out and you will read the same in both.