nrf52840 uart dfu fail

[john.liu]

Hi:

I use sdk nRF5_SDK_17.1.0_ddde560. bootloader use examples\dfu\secure_bootloader\pca10056_uart_debug.

It cann't enter the application.

But If I use examples\dfu\secure_bootloader\pca10056_s140_ble_debug.

It can enter the application.

Except for the bootloader, their other applications, dfu_ppublic_key, and softdevice are the same.

[Susheel Nuguru]

Something seems wrong with the settings page you have, try to erase the settings page and regenerate the settings page using nrfutil and flash it again. See if you are using the right version of bootloader and application for the settings

[john.liu]

hi:

nrfutil settings generate --family NRF52840 --application spectrumWear_v008\EventSystem.hex --application-version 3 --bootloader-version 2 --bl-settings-version 1 middle\settings.hex

mergehex.exe -m s140_nrf52_7.2.0_softdevice.hex spectrumWear_v008/EventSystem.hex -o middle/sd_app.hex

mergehex.exe -m middle\sd_app.hex spectrumWear_v008/bootloader_uart.hex -o middle/sd_app_boot.hex

mergehex.exe -m middle\sd_app_boot.hex middle/settings.hex -o spectrumWear_v008/spectrumWear_all.hex

nrfjprog.exe --family NRF52 --eraseall
nrfjprog.exe --family NRF52 --program spectrumWear_v008\spectrumWear_all.hex
nrfjprog.exe --family NRF52 --verify spectrumWear_v008\spectrumWear_all.hex
nrfjprog.exe --reset

It cannot jump to the application layer.

bootloader_uart.hexEventSystem.hex2210.s140_nrf52_7.2.0_softdevice.hex