nRF52832 P0.21/RESET pin

RE: nRF52832 P0.21/RESET pin

Susheel Nuguru — Thu, 08 Mar 2018 07:52:56 GMT

Vikash, If you are using DK make sure that you have shorted SB17 bridge as shown in the back of the DK board.

RE: nRF52832 P0.21/RESET pin

Vikash Kumar — Sun, 11 Feb 2018 10:54:28 GMT

hey RK i did the same. Now i can see that reset button doesn't work. But still i am not able to use P0.21 as input pin. Please help

RE: nRF52832 P0.21/RESET pin

Vala — Fri, 09 Sep 2016 09:21:45 GMT

OK I thought CONFIG_GPIO_AS_PINRESET should be defined in the main source file. I am using GCC and I found two flags about CONFIG_GPIO_AS_PINRESET in the make file of the project. I commented both and now everything works as expected. Thanks RK.

RE: nRF52832 P0.21/RESET pin

RK — Fri, 09 Sep 2016 08:51:38 GMT

I told you what to check in the previous answer

RE: nRF52832 P0.21/RESET pin

Vala — Fri, 09 Sep 2016 08:50:08 GMT

Thanks for your answer RK. You are right. Here is what I get: nrfjprog --eraseuicr --family nrf52 Erasing UICR flash area. Applying system reset.

nrfjprog --memrd 0x10001200 --family nrf52 0x10001200: FFFFFFFF |....|

nrfjprog --memrd 0x10001204 --family nrf52 0x10001204: FFFFFFFF |....|

nrfjprog --memwr 0x100010FC --val 0x00000001 --family nrf52 Parsing parameters. Writing.

nrfjprog --memrd 0x100010FC --family nrf52 0x100010FC: 00000001 |....|

nrfjprog -r --family nrf52 Applying system reset. Run.

nrfjprog --memrd 0x10001204 --family nrf52 0x10001204: 00000015 |....|

nrfjprog --memrd 0x100010FC --family nrf52 0x100010FC: 00000001 |....|

After the reset the value of PSELRESET is again 0x00000015. It's interesting because I do not have anything more than a couple of lines for toggling the IOs in my code, which is a modification of the blinky example. Is there anything else I should check?

RE: nRF52832 P0.21/RESET pin

RK — Fri, 09 Sep 2016 08:22:04 GMT

So if you read back the values are they still FFFFFFFF? If not then something must be rewriting them

you probably have CONFIG_GPIO_AS_PINRESET defined.

RE: nRF52832 P0.21/RESET pin

Vala — Fri, 09 Sep 2016 08:18:06 GMT

Hi,

Please tell me if I'm doing anything wrong with disabling the RESET. Using nrfjprog I erase the UICR and after that the all the registers including two PSELRESET registers are set to 0xFFFFFFFF:

nrfjprog --eraseuicr --family nrf52 Erasing UICR flash area. Applying system reset.

nrfjprog --memrd 0x10001200 --family nrf52 0x10001200: FFFFFFFF |....|

nrfjprog --memrd 0x10001204 --family nrf52 0x10001204: FFFFFFFF |....|

But when I restart the device it again does not start executing until I manually set the P0.21 pin. Any idea?

RE: nRF52832 P0.21/RESET pin

Vala — Mon, 05 Sep 2016 10:30:50 GMT

Thanks.

Vala

RE: nRF52832 P0.21/RESET pin

RK — Mon, 05 Sep 2016 10:24:22 GMT

Yes it's in the manual. Set PSELRESET registers and reset the chip. They are retained and will disable reset.