nRF52832 DFU over UART

[PiKa PiKa]

Hello,

I'm using nRF52832 and the SDK version is "nRF5_SDK_17.0.2_d674dde" ,

First I tried DFU over UART using \examples\dfu\secure_dfu_test_images\uart\nrf52832, and it worked fine

but when I tried to rebuild the source code \examples\dfu\secure_bootloader\pca10040_uart\ses and do the same steps as above,then it doesn't work

I can't see my device in nRF Connect anymore, and J-Link RTT Viewer doesn't show any log

what is the different betweet example bootloader hex and the bootloader hex I rebuilt

[Einar Thorsrud]

Hi,

The pre-built example projects (including bootloader) also includes the SoftDevice or MBR hex if needed, and the serial bootloader depends on the MBR. This has been accomplished by merging all the needed hex files. In this case, in addition to the bootloader you built you also need the MBR from <SDK>\components\softdevice\mbr\hex\. You can either program them separately, or merge them together using mergehex (from nRF Command Line Tools) and then program.

PS: The Segger embedded studio bootloader projects has the MBR as an additional load file, so if you program from Segger Embedded Studio the MBR will be programmed automatically. This is also the case for projects that depend on the SoftDevice.

[PiKa PiKa]

Hi,

as you said , what I'm using now is segger embedded studio bootloader projects but after rebuild source code , then i mergeing application , softdevice , bootloader together ,and program into my device , it doesn't work.

and I also have tried to merging MBR from \components\softdevice\mbr\hex\mbr_nrf52_2.4.1_mbr.hex into hex,then program , it doesn't work too 

[Einar Thorsrud]

I see. Can you say more about how it does not work? Please test with the debug bootloader project (\examples\dfu\secure_bootloader\pca10040_uart\_debug), which has RTT logging. As long as you program this and a SoftDevice or MBR, you should get RTT logs from the bootloader which hopefully gives some clues about what is going on.

[PiKa PiKa]

Hi,

it does not work when I build \examples\dfu\secure_bootloader\pca10040_uart\ses , I can not found my device in nRF connect mobile App.

and then I tried to build \examples\dfu\secure_bootloader\pca10040_uart_debug\ses, it worked 

I don't know what happened to the bootloader project without debug

[Einar Thorsrud]

Hi,

Did you flash SoftDevice or MBR? I ask because I did not notice before that you were using BLE in the application, but as you are using nRF connect mobile App and cannot find it there, I assume that is the application using BLE. If so, you need to flash the SoftDevice. The debug project and "normal" project should be more or less the same except for logging, so please double check that. If it does not work, perhaps you can explain in detail step by step how you build, program and test everything?