RE: How to write UICR at runtime in the nRF5340

PabloL — Mon, 09 Jun 2025 22:18:30 GMT

Sorry, my fault!

This is the corrected code:

void UICR_write(uint32_t data)
{
    NRF_NVMC_Type* nvmc;

    nvmc = NRF_NVMC;

    // Enable write mode
    nvmc->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);
    __ISB();
    __DSB();

    // Write the value
    *(uint32_t *)TARGET_ADDRESS = data;

    // Wait until write is finished
    while (!nrf_nvmc_ready_check(nvmc)) {}
    
    // Disable write mode
    nvmc->CONFIG = NVMC_CONFIG_WEN_Ren;
    __ISB();
    __DSB();

    // Reset to apply changes
    sys_reboot(SYS_REBOOT_COLD);
}