SAMD21 PRO RF USB COM Port stopped working normal mode

Community Development Platforms
1

Hi,

I used the SAMD21 ProRF for the first time when I programmed it with a sketch and didn’t realize the serial monitor was connected. After the sketch was uploaded the Windows and Ubuntu systems were unable to recognize the USB device and this affects Arduino. The only way to upload a sketch is to put the chip into bootloader mode. In bootloader mode, the PC is able to recognize the device with no issue, I am also able to putty to the COM port. Is it possible to fix this issue, if so how? Also, how can I tell if the sketch is running ? I don’t see any of the TX or RX lights illuminate , I have closed the LoraWAN jumpers.

Mike

2

Run through this https://learn.sparkfun.com/tutorials/sa … leshooting guide

Does hitting “upload” a 2nd time work? Also see https://learn.sparkfun.com/tutorials/sp … d21-pro-rf

If still no luck I would try going back to a simple ‘blink’ sketch and get that working/uploading appropriately and then switch back to a LoRa one (the closed jumpers will only affect the RF schema, you can leave them closed while testing the blinks sketch)