Troubleshooting
USB CDC on Boot Settings
Take note of the option labeled "USB CDC on Boot" when selecting the Board from the Tools menu. This option sets the serial outputs and defines their label for use in code. The SparkFun variants default to Enable USB CDC on boot which sets both Serial and Serial0 as available serial ports. In this configuration, Serial corresponds to the direct USB/Serial converter on the chip (and the USB-C interface) and Serial0 corresponds to the UART0 bus (default pins are 16 and 17).
With either setting, Serial1 is available and refers to the UART1 bus (default pins are 4 and 5).
General Troubleshooting
Need Help?
If you need technical assistance or more information on a product that is not working as you expected, we recommend heading over to the SparkFun Technical Assistance page for some initial troubleshooting.
If you can't find what you need there, the SparkFun Forums is a great place to search product forums and ask questions.
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