RE: chip doesn't enter in dfu mode

DmitrySol — Tue, 22 Sep 2020 09:31:31 GMT

thanks

RE: chip doesn't enter in dfu mode

Vidar Berg — Tue, 22 Sep 2020 09:24:18 GMT

Thanks for the update. "nrf_power_gpregret2_set(BOOTLOADER_DFU_SKIP_CRC);" is actually not needed for entering DFU. It's used to skip CRC boot validation of the app on subsequent boot and is mainly used for enabling faster startup from System OFF mode.

Here's how we have implemented the buttonless mechanism for our BLE service for reference:

uint32_t ble_dfu_buttonless_bootloader_start_finalize(void)
{
    uint32_t err_code;

    NRF_LOG_DEBUG("In ble_dfu_buttonless_bootloader_start_finalize\r\n");

    err_code = sd_power_gpregret_clr(0, 0xffffffff);
    VERIFY_SUCCESS(err_code);

    err_code = sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
    VERIFY_SUCCESS(err_code);

    // Indicate that the Secure DFU bootloader will be entered
    m_dfu.evt_handler(BLE_DFU_EVT_BOOTLOADER_ENTER);

    // Signal that DFU mode is to be enter to the power management module
    nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);

    return NRF_SUCCESS;
}

RE: chip doesn't enter in dfu mode

DmitrySol — Tue, 22 Sep 2020 09:19:33 GMT

It is solved.

It was needed to write two registers:
nrf_power_gpregret_set(BOOTLOADER_DFU_START);
nrf_power_gpregret2_set(BOOTLOADER_DFU_SKIP_CRC);

Is it normal to make it not in state observer function (as in the example)?

just in parsing SPI command function?