P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

RE: P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

hmolesworth — Sat, 21 Sep 2024 21:45:37 GMT

Reset_Handler() should call SystemInit() either in c code or asm code before invoking depending on how old the software is. Maybe try an erase all before testing to see if that works. This may also be an APROTECT issue, best if Nordic engineers respond on that point; this would depend on the nRF53832 die version see INFO.PART and INFO.VARIANT.

As an aside, in rare cases the UICR write number limitation Nwrite (=811 writes) may have been exceeded by something writing periodically to the same flash block, in which case an erase UICR or erase all is required to restart the life count. A double attempt to write once this number has been exceeded may work, but this is unspecified; exceeding Fwrite may result in adjacent bits being adversly affected, or may require more writes to clear a given bit.

RE: P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

Paul — Sat, 21 Sep 2024 03:38:06 GMT

I have the same question! I also had to call SystemInit() in my main() to get it to work. Why??

RE: P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

hmolesworth — Tue, 04 May 2021 23:26:54 GMT

Good news, but SystemInit() should already have been called from within iar_startup_nrf52.s:

__vector_table
        DCD     sfe(CSTACK)
        DCD     Reset_Handler

Reset_Handler
        LDR     R0, =SystemInit
        BLX     R0
        LDR     R0, =__iar_program_start
        BX      R0

Have you used a different Reset_Handler?

RE: P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

MC9 — Tue, 04 May 2021 10:05:59 GMT

I got it working by calling SystemInit(); in my main.c !

RE: P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

MC9 — Tue, 04 May 2021 09:19:08 GMT

Thank you for your reply! I have added CONFIG_NFCT_PINS_AS_GPIOS in the Defined Symbols as you suggested, but it still doesn't work. Could it be something else?

RE: P0.09 and P0.10 as GPIO (nRF52832 + IAR + custom board)

hmolesworth — Fri, 30 Apr 2021 16:35:25 GMT

Adding the CONFIG_NFCT_PINS_AS_GPIOS is correct, but not in main.c. Instead in IAR add this macro in Options->C/C++ Compiler->Preprocessor->Defined Symbols

This macro is then applied in system_nrf52.c the first time power is applied thus:

    /* Configure NFCT pins as GPIOs if NFCT is not to be used in your code. If CONFIG_NFCT_PINS_AS_GPIOS is not defined,
       two GPIOs (see Product Specification to see which ones) will be reserved for NFC and will not be available as
       normal GPIOs. */
    #if defined (CONFIG_NFCT_PINS_AS_GPIOS)
        if ((NRF_UICR->NFCPINS & UICR_NFCPINS_PROTECT_Msk) == (UICR_NFCPINS_PROTECT_NFC << UICR_NFCPINS_PROTECT_Pos)){
            NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos; // Write Enable
            while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
            NRF_UICR->NFCPINS &= ~UICR_NFCPINS_PROTECT_Msk;
            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