custom board ( nrf52840 )com port is opening and closing again again..

[fatih basaris]

Hi everyone again,

We have a custom board using nrf52840. We upload a bootloader with J-Link.

https://github.com/adafruit/Adafruit_nR ... 40_express

But we have a problem. When I connect our device to computer, com port is opening and closing one after the other.

I upload a video to youtube. (https://www.youtube.com/watch?v=7Da94As4Dx8). I did not do anything when our device connected to my computer. Is there any idea for me??

Best regards..

[Edvin]

Hello,

I don't know what your custom board looks like, but I don't think it will work with the adafruit feather bootloader without modifications. I suggest that you look into creating your own bootloader that matches your bord. 

I suggest that you check out this guide on getting started with DFU. It is written for a BLE bootloader, but you can change it to a USB bootloader if you like. I suspect that the adafruit bootloader is a drag'n'drop bootloader? The one in our SDK is not, unfortunately. If you need that, I suggest that you contact Adafruit and ask them for the source code for their bootloader. 

Best regards,

Edvin

[fatih basaris]

Thanks for the answer Edvin.