How Can I Store the Device Name that won't change after a firmware update ?

[Christos.Bou]

Hi,

We are trying to change the name of our BLE device of our solution with being always different for each device. The device name would be like a serial number that is unique to each device.

Our project has a bootloader and via this bootloader, we can update the firmware of the device.

The goal is to have the possibility to change the device name via a mobile app (which works) but this device name needs to not changed when the firmware is updated, like a variable that is store in a part of the NRF52 that is not erased.

Does anyone knows how to do that ?

Big thanks,

Chris

[Christos.Bou]

Hello,

I've been working on it, and I achieved to erase the UICR register and to write on it. But I got an issue...

I've been receiving this error code : Received a fault! id: 0x00004001, pc: 0x00000000, info: 0x2000FF24

If I understand it well, it's the NRF_ERROR_NO_MEM which means that there is no memory for the operation ? But If I debug my code, I can clearly see that the UICR register is erasing and writing well...

Here's my code for the UICR register :

static void write_name ()
{    
    ret_code_t err_code;

    err_code = nrf_sdh_disable_request();
    APP_ERROR_CHECK(err_code);

    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een << NVMC_CONFIG_WEN_Pos;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
    NRF_NVMC->ERASEUICR = NVMC_ERASEUICR_ERASEUICR_Erase;
    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
    NRF_UICR->CUSTOMER[0] = 0xAAAAAAAE;
    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);
}

Do someone have an answer to this issue ?

Chris

[Jørgen Holmefjord]

Hi,

Which function call is giving you the NRF_ERROR_NO_MEM error?

I can't see why any of the functions you posted should return this error, especially if you have previously enabled the softdevice without errors.

Do you get the same error without calling the write_name function?

Best regards,
Jørgen

[Christos.Bou]

Hi,

Finally, the error was because I was not reseting the Soft Device at the end.

Thanks for your help !