RESET PIN flag of RESETREAS sets after power cycle

RE: RESET PIN flag of RESETREAS sets after power cycle

Florent — Thu, 20 Sep 2018 09:53:04 GMT

Thank you for your answer Einar.

Indeed, it's custom HW. Bu you are right. I will test on an DK board. I have no DK board with me today. I will therefore try tomorrow and see the behavior with this HW.

Concerning the reset pin, as you say, I will also test with the reset pin not enabled.

I will inform you about the results tomorrow (after the test on the DK board).

Best regards,

Florent

RE: RESET PIN flag of RESETREAS sets after power cycle

Einar Thorsrud — Thu, 20 Sep 2018 09:38:02 GMT

Hi,

Are you using custom HW? Could it be that for some reason the reset pin is asserted for some reason during power-up?

My last question should not have been a separate point, so It became unclear. What I wander is if you see the same behaviour if you don't have pin reset enabled (to disable it you have to erase UICR and do a power cycle)?

RE: RESET PIN flag of RESETREAS sets after power cycle

Florent — Thu, 20 Sep 2018 09:20:30 GMT

Hi Einar,

Thank you for your answer.

Can you upload a code snippet that reproduces it on your side? Here is what I'm doing:

uint32_t reset_reason;
// Read the RESETREAS register
reset_reason = NRF_POWER->RESETREAS;
// Clear the flag
NRF_POWER->RESETREAS = 0xFFFFFFFF;

After a power cycle, reset_reason = 1. After a soft reset from my code for instance, reset_reason = 4.

Do you see it occurring on multiple nRF52832 devices?

Yes I've tried on 3 devices and it happened on the 3.

Is pin reset enabled for the device (PSELRESET in UICR)?

I think so but maybe I'm doing it in a wrong way. Here is how I do:

if (((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos)) ||
  ((NRF_UICR->PSELRESET[1] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))){
	/** Configure the NVMC for write mode */
	NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
	while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
		// Do nothing.
	}

	/** Activate the reset pin */
	NRF_UICR->PSELRESET[0] = 21;
	while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
		// Do nothing.
	}
	NRF_UICR->PSELRESET[1] = 21;
	while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
		// Do nothing.
	}

	/** Desactivate write mode for the NVMC (let it in read mode) */
	NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
	/** Wait until config is done */
	while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
		// Do nothing.
	}
}

Do you see the same if it is not?

I'm not sure to understand what you mean sorry.

Thanks in advance for your answer,

Best regards,

Florent

RE: RESET PIN flag of RESETREAS sets after power cycle

Einar Thorsrud — Thu, 20 Sep 2018 08:19:55 GMT

Hi,

I have not been able to reproduce this on my side. I have a few questions:

Can you upload a code snippet that reproduces it on your side?
Do you see it occurring on multiple nRF52832 devices?
Is pin reset enabled for the device (PSELRESET in UICR)?
Do you see the same if it is not?

Einar