User App fails DFU at 10% completion

RE: User App fails DFU at 10% completion

Hung Bui — Fri, 03 Mar 2017 14:21:34 GMT

Hi Kevin, it's pretty strange that the foam insulation can cause wrong behaviour to the chip. The only affect I can think of is if it's electrical conductive and cause short circuit, or it block the radio signal.

Heat could be a reason, but I don't think it can get above +85oC.

RE: User App fails DFU at 10% completion

Kevin s — Fri, 03 Mar 2017 13:55:50 GMT

My Hardware was somehow interfering with the DFU....the person who made it put some foam insulation over the Nordic nRF52 IC. Once removed, everything works.

RE: User App fails DFU at 10% completion

Hung Bui — Fri, 03 Mar 2017 13:21:53 GMT

Hi Kevin,

I would suggest you to run your board in debug mode (set optimization level to 0) and try to break when the issue occurs. You should also add DEBUG flag in the preprocessor symbol and try to add a breakpoint in app_error_handler to check if there is any assertion. Here is the debug guide.

RE: User App fails DFU at 10% completion

Kevin s — Fri, 03 Mar 2017 13:15:53 GMT

OK, I tried on a unmodified development board and it worked. I was able to download my app from the buttonless example, and then the HRM from my app. My hardware has some UART lines over to a PIC and some GPIO driving some LEDs.

RE: User App fails DFU at 10% completion

Kevin s — Fri, 03 Mar 2017 13:02:39 GMT

The peripheral indeed crashes and locks up; no activity. I do not have a watch dog timer and I have also sent the command to stop all timers before leaving to bootloader. As I said earlier, my bootloader works with the button less example loading the HRM package. I will try to load my app.

RE: User App fails DFU at 10% completion

Hung Bui — Fri, 03 Mar 2017 12:00:47 GMT

Hi Kevin,

From the log it seems like the peripheral crashed.

What do you see after it crashed ? Did it advertise as DFUTarg or start back to normal application ?

Do you have watch dog timer on your application ? You would need to keep feeding the dog in the bootloader.

If you try to test with other example, for example the button less example, can you re-update the application ?