nRF52 avoid DfuTarg: how to prevent from staying stuck in bootloader mode without starting the app

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board: nRF52832_xxac_s132 nordic / SDK 11

While you try to add DFU OTA service and flash softdevice, application ,and bootloader to your nRF52 (by nRFgo or command line tools), you might see its BLE Advertising name as “ Dfutarg”. Like this :

and that means your application does not start. The device stays stuck in bootloader.

There are 2 ways to solve this problem:

First solution: program by command line tools and write memory

1. go to
C:\..\Nordic Semiconductor\nrf5x\bin
open command line, and write :

:: power by Agatha Kuan 20170419

.\nrfjprog.exe --family NRF52 --eraseall
.\nrfjprog.exe --family NRF52 --program %your_softdevice_name%
.\nrfjprog.exe --family NRF52 --program %your_application_name%
.\nrfjprog.exe --family NRF52 --program %your_bootloader_name%
.\nrfjprog.exe --family NRF52 --memwr 0x7f000 --val 1
.\nrfjprog.exe --family NRF52 --reset

then after it reset , the application will start.

Second solution : add patch file

I provide you a patch file to force the device to start application after reset.
please download by this link :
https://drive.google.com/open?id=0ByqJaZSFoV7Hb190d1l4UjNzb28

and program by command line tools. Open command line and write:

:: power by Agatha Kuan 20170419.\nrfjprog.exe --family NRF52 --eraseall
.\nrfjprog.exe --family NRF52 --program %your_softdevice_name%
.\nrfjprog.exe --family NRF52 --program %your_application_name%
.\nrfjprog.exe --family NRF52 --program %your_bootloader_name%
.\nrfjprog.exe --family NRF52 --program patch.hex
.\nrfjprog.exe --family NRF52 --reset

Note:

1.the patch.hex file can only use on nRF52832 SDK11

2.these 2 solution does not work after reset or DFU

3.if you want to use the first solution on nRF51, please see here

(it is 0x3FC00 for nrf51)

Reference:

https://devzone.nordicsemi.com/question/22056/combining-sd-dfu-and-application-hex-and-programming/

https://devzone.nordicsemi.com/question/37880/initdat-file-for-dfu-gets-crc-error-correct-order-nrf-beacon-help/

https://devzone.nordicsemi.com/question/70738/bootloader-does-not-start-application/