After a few weeks of developing, one of my spark cores does not print out data over USB anymore (by using Serial.println() ).
A simple test program shows that one core prints out data, the other doesn’t. To be more specific: with the operational core, the usb-serial driver is loaded in windows, and data is received by TeraTerm. With the other core, the usb-serial driver is not even loaded (checked this with a util called usbview).
I suspect this might be a hardware problem. Is there a test program that checks the functionality of the core? I admit this is hard when no USB is available to print the results Maybe a test program that outputs the result to the LEDs, the cloud or to Android?
Are there other ways to check the USB function?
Appreciate your help!