Unable to use gpio reset pin as a gpio in nrf connect sdk

RE: Unable to use gpio reset pin as a gpio in nrf connect sdk

Elfving — Tue, 08 Feb 2022 13:03:16 GMT

Hi Rico!

You can use the terminal commands described above (eg. west flash --softreset). Unfortunately this isn't possible using the UI in Visual Studio Code, but you could do it using a terminal in the IDE. A launch.json task can be created as well, if it needs to be frequently called.

Btw, keep in mind that this is an older case. You might want to create a new support ticket if you don't get much help on an older one.

Regards,

Elfving

RE: Unable to use gpio reset pin as a gpio in nrf connect sdk

rico — Tue, 25 Jan 2022 14:24:30 GMT

Hello Heidi,

I recognized the same as madblue. If using VSCode and the NRF Connect SDK Extension the flash function writes to the UICR, even if

CONFIG_GPIO_AS_PINRESET=n

is set. I have erased the flash before and validated the UICR being all 0xFF, then just used flash functionality from the extension.

Is there any solution available?

RE: Unable to use gpio reset pin as a gpio in nrf connect sdk

madblue — Wed, 05 May 2021 13:04:19 GMT

Thank you Heidi,

I have found that ' west flash ' is writing to UICR register to enable pin reset, which was causing the problem.

I have got it fixed by using,

nrfjprog -e && west flash --softreset,

Or by using nrfjprog --family nRF52 --program

I This looks like a serious issue and i wonder why does the west tool is updating the UICR registers.

Thanks for the support.

RE: Unable to use gpio reset pin as a gpio in nrf connect sdk

Heidi — Wed, 05 May 2021 12:32:31 GMT

Hi!

From your devicetree, it looks like botoh SPI3 and the Arduino connector are defined correctly. Could you show me all the application configurations and how you're initializing the SPI in your application?

RE: Unable to use gpio reset pin as a gpio in nrf connect sdk

madblue — Wed, 05 May 2021 04:22:39 GMT

hi Hmolesworth,

Thanks for the reply.

I don't really want to add direct register access to the application code and wish to do it with zephyr apis/configurations itself. (without using any lower layer codes mainly because it can cause porting issues.)

There should be some other ways to get it done without directly accessing the registers(hope so). In worst case, i will try this out.

fyi: It is already working with my nrf5 sdk based code.

RE: Unable to use gpio reset pin as a gpio in nrf connect sdk

hmolesworth — Mon, 03 May 2021 17:50:57 GMT

Not sure if this helps, but the reset pin configuration is one-way; once set as a reset pin the only way to unset and use as a port pin is to do a flash erase all, and reprogram. This example is SDK not nRFConnect for nRF52832 but nRF52840 is similar with port P0.18 instead:

    /* Configure GPIO pads as pPin Reset pin if Pin Reset capabilities desired. If CONFIG_GPIO_AS_PINRESET is not
      defined, pin reset will not be available. One GPIO (see Product Specification to see which one) will then be
      reserved for PinReset and not available as normal GPIO. */
    #if defined (CONFIG_GPIO_AS_PINRESET)
        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))){
            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] = 21;
            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
            NRF_UICR->PSELRESET[1] = 21;
            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){}
            // UICR changes require a reset to be effective
            NVIC_SystemReset();
        }
    #endif