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SERCOM (Serial Communication) is a multiplexed serial configuration used on the SAMD21, SAMD51 and other boards. It allows you to select various serial functions for most of your pins.
SparkFun ProDriver and Mini Stepper Motor Driver utilize the latest TC78H670FTG stepper motor driver from Toshiba. With two different methods for control (serial communication or clock-in stepping) this is a great option for your next project that requires precise motor control.
The APA102C addressable LEDs employ a 2-wire communication protocol consisting of a clock and data line.
Our friends at SparkFun have put together a good "how to" more easily program your Arduino sketches using Arduino's CLI & Visual Studio Code.