A UICR write operation has been requested but UICR has not been erased

[Chris]

There are already a few threads about this problem but none of them helped.

I want to use GPIO9 + 10 as .. well .. GPIO.

Here's what I did:

• added CFLAGS += -DCONFIG_NFCT_PINS_AS_GPIOS in Makefile
• added a section in linker script:

UICR_NFCPINS(r) : ORIGIN = 0x1000120C, LENGTH = 0x04

SECTIONS { /* Write the bootloader address in UICR. / .uicrNfcPinsAddress : { KEEP((.uicrNfcPinsAddress)) } > UICR_NFCPINS }

• set the constant in main.c: const uint32_t UICR_ADDR_0x20C attribute ((section(".uicrNfcPinsAddress"))) attribute((used)) = 0xFFFFFFFE;

And after all, still it didn't help, I always had the "A UICR write operation..." message and the GPIOs didn't work.

Finally I did nrfjprog --memwr 0x1000120c --val 0xFFFFFFFE --family nrf52 --verify That helped but is not best practice, I guess - and still the message did not disappear (but the GPIOs work at least)

Any help please?

[bjorn-spockeli]

@chrismakaio: You should only have to add CFLAGS += -DCONFIG_NFCT_PINS_AS_GPIOS to the Makefile, the nRF52 will then run this snippet on startup(see the system_nrf52.c file)

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

However, adding

const uint32_t UICR_ADDR_0x20C __attribute__ ((section(".uicrNfcPinsAddress"))) __attribute__((used));

to main.c and modifying the linker script by adding

UICR_NFCPINS(r) : ORIGIN = 0x1000120C, LENGTH = 0x04

under MEMORY in the linker script and adding

.uicrNfcPinsAddress : 
  { 
     KEEP(*(.uicrNfcPinsAddress)) 
  } > UICR_NFCPINS

under SECTIONS should also work. Are you using nrfjprog to flash the compiled hexfile?

[bjorn-spockeli]

Alternatively, you can run make erase and then make flash.