How to add the dfu function to a ble_uart example?

[cgha]

I've developed my project based on ble_uart example in sdk 12.3.0, the hardware is a customed pcba using NRF51822 QFAC chip, now I want to add the OTA function through DFU, but when I added the files and changed according to buttonless example, my app can not advertising upon poweron.

1. Change sdk_config.h, open the fds, app_scheduler, peer_manager, crc32

2. Added the missing files according buttonless example, 

3. Added the missing event handler

4. Change vs_uuid_count from 1 to 2.

5. Change the iram start from 0x20001FE8 to 0x20001FF8 and the size to 0x6008

6. Add NRF_DFU_SETTINGS_VERSION=1 in keil preprocessor

7. Add peer_manager_init in main

8. Add ble_dfu init in services_init

Now compile ok, but when I download and run, I can not found my peripheral on LightBlue. Do I need to change the IROM setting? If yes, how to change? or Should I need to rework using the ble_dfu_buttonless example as the base project?

[Hung Bui]

Hi Chris, 

Have you tried to check if any error in the log ? 
Have you flashed the bootloader ? How did you flash the application ? Please be aware that you would need to do DFU update to flash the application. Otherwise if you want to flash the application via the programmer you would need to generate the bootloader setting and flash the bootloader setting as well. 

Other than that what you did was fine. 

Have you done any DFU update by the bootloader with and without the buttonless example ? 

[cgha]

No, I have not flashed the bootloader, since I have not put it in bootloader mode yet, I just want to see if the app works after I added the dfu service. If it work, (can advertising, can connect and see the nus service), then I will flash bootloader using nrfgo and jlink and test dfu.

[Hung Bui]

Hi, 

No the application doesn't work without the bootloader.

My suggestion is to get familiar with the bootloader and the DFU process first before you test with buttonless application. 

I have made a guide here that you may want to take a look: Getting started with Nordic's Secure DFU bootloader, a step by step guide