I've just started using a MKRZERO for some SPI communications with an A/D for a mixed signal project. The board was communicating and working yesterday and stopped this morning.
I'm running Ardunino 1.8.5
I've tried the 1.6.17 and 1.16.18 board libraries.
If I double click the reset button I get the blinking LED indicating bootloader is active...but I cannot for the life of me get the bootloader reinstalled using the directions on the MKR page including changing the programmer to Atmel EDBG
I've uninstalled/reinstalled the board libraries and IDE. And I've tried the following
I also had the same problem, I have now cured the problem as follows.
1. Loaded Arduino software onto another PC and burnt an empty sketch to the MKRZero.
2. Uninstalled SAMD board module from Arduino library manager.
3. Downloaded USBDeview from web and used to physically remove driver from windows directory.
4. Reinstalled SAMD board module.
The board has worked correctly since. I hope this helps someone, It definitely seems to be a driver compatibility or corruption problem.
Scamb09
Each time I do this the port number goes up one and it looks like the board took the program..but it won't start running and the USB connection is lost again. This morning I was on Com 8...I'm up to 13 now.
Any other suggestions?
Scott