RE: pin reset disable

Jørgen Holmefjord — Fri, 03 May 2024 09:17:30 GMT

Are you building for the nRF52833 DK or a custom board?

The pin reset is enabled by default in the nRF52833 DK board DTS file. Did you comment this, or only in the project overlay?

You can also use the delete-node property to disable it in the overlay:

/delete-node/ &uicr;

[quote user="Lorenz898989"]I also found that the assignment of the thirty-first bit of PSELRESET (which is used to disconnect the function) was not being handled correctly: I ended up with PSELRESET[0,1] being valued at 0 instead of being valued at 1< <31 [/quote]

You cannot "assign" the 31st bit and set it to 1 if it is already cleared/set to 0. UICR works like flash and needs to be erased to "write" bits to 1.

RE: pin reset disable

Lorenz898989 — Thu, 02 May 2024 07:33:40 GMT

[quote userid="14926" url="~/f/nordic-q-a/110653/pin-reset-disable/481074"]

Hi,

The reset pin should now be configured in the devicetree, as described in the migration guide draft. The Kconfig should still work for nRF Connect SDK v2.5.1 though.

Note that if pinreset have been enabled by an older firmware, you need to erase UICR (using "Erase and Flash to Board" button in VSCode) in order to disable the pinreset functionality:

Best regards,
Jørgen

[/quote]

Hi Jørgen

I commented on the .dts file and on the .overlay file in this way
&uicr {
//gpio-as-nreset;
};

I recompiled the entire project and manually deleted the flash, however the micro controller keeps restarting.

Any other suggestions?

-----------------------------------------------------------------------------------------------------------------------------------------------------------------

EDIT:

I handled the problem in this way.
As you can see in the code below I force one of the 2 registers on another pin so that the pin reset function is implicitly disabled:

void disablePinReset()
{

    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos; // Read-only Enable
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
    }
    

    if ((NRF_UICR->PSELRESET[0] == NRF_UICR->PSELRESET[1]))
    {
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos; // ERASE UICR
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        };
        NRF_NVMC->ERASEUICR = NVMC_ERASEUICR_ERASEUICR_Erase;

        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        };

        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos; // enable read
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        }
        
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos; // Write Enable
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        }
        NRF_UICR->PSELRESET[0] = 17UL;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        }
        NRF_UICR->PSELRESET[1] = 18UL; 
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        }
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos; // Read-only Enable
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        }

        NVIC_SystemReset(); // UICR changes require a reset to be effective
    }
}

I also found that the assignment of the thirty-first bit of PSELRESET (which is used to disconnect the function) was not being handled correctly: I ended up with PSELRESET[0,1] being valued at 0 instead of being valued at 1< <31 .

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fuicr.html as reference for PSELRESET management

RE: pin reset disable

Jørgen Holmefjord — Mon, 29 Apr 2024 12:19:55 GMT

Hi,

The reset pin should now be configured in the devicetree, as described in the migration guide draft. The Kconfig should still work for nRF Connect SDK v2.5.1 though.

Note that if pinreset have been enabled by an older firmware, you need to erase UICR (using "Erase and Flash to Board" button in VSCode) in order to disable the pinreset functionality:

Best regards,
Jørgen