RE: nrf52833 dfu has been stuck in the bootloader problem

Mikey — Fri, 19 Nov 2021 12:45:28 GMT

There are no problems in troubleshooting DFU steps, creating commands and implementation process. In the end, you can only find hardware problems. The last idea in the article is correct, but the pin found is wrong. For example, I use the pin definition of pca10100. H, so the key I check should be key 4, that is, pin 25, other custom boards and chips, and so on.

DFU upgrade is to enter the protocol stack first, then the bootloader, and finally the bootloader decides whether to enter the app. Therefore, when I get stuck in the bootloader, there are events that prevent me from entering the app. Check the bootloader project and find that it has a key detection, and the official document also has this prompt.

Therefore, I checked the pin of my custom board from this pin number and found that this pin is used as SCL.

The pin is pulled high, causing it to enter the bootloader all the way.

The solution is to change the pin number and use the unused pin number as the bootloader key detection pin.

Then you can enter the app to complete the DFU upgrade~

Thanks for Nordic's help.

RE: nrf52833 dfu has been stuck in the bootloader problem

Mikey — Fri, 19 Nov 2021 12:28:56 GMT

I found the cause of the problem and recorded it. I hope people with the same problem can solve it as soon as possible.