reading a pre-programmed key from flash

[Sal]

Hi,

Reading from flash, an already programmed key, returns zero. Using sdk 12.1, sd s132_nrf52_3.0.0, nrf52832, and pstorage. The key is programmed after uploading the fw, image using jlink. Please advise if I am missing any other api calls or if pstorage api would be the recommended way (please provide pstorage sample to register two pages).

Thanks in advanced.

void read_key_from_flash(void)
{
    uint32_t err_code;
    uint32_t page = 118;            //offset 0x76000
    uint8_t  word_count = 8;        //number of 32 bits words read
    uint32_t data_array[8]={0x0};   //pointer to a RAM area where the found data will be written (32 bits aligned)

    err_code = ble_flash_page_read(page, data_array, &word_count);  //does not seem to update the buffer
    SEGGER_RTT_printf(0, "err_code=%d\n", err_code);                //error code is 5
    //APP_ERROR_CHECK(err_code);

    for (int i=0; i<8; i+=4)
    {
        SEGGER_RTT_printf(0, "Page %2d, data_array[%2d] = %.4X %.4X %.4X %.4X\r\n",
        page, i,
        data_array[i + 0],
        data_array[i + 1],
        data_array[i + 2],
        data_array[i + 3]);
    }
}

[Jørgen Holmefjord]

Are you reading the Key before or after the softdevice is enabled? If reading it before, you can read the flash address directly, as shown in the flash write example. It is also possible to store data in the UICR CUSTOMER registers.