[Page Add][Contributor's IDEA]Add Example for Configuring Custom SERCOM UART on XIAO SAMD21

[MatthewJeffson]

Overview

• Provide a simple example showing how to configure a SERCOM instance on the XIAO SAMD21 to use UART on non-default pins, such as D2 (TX) and D4 (RX). The example should include basic send/receive functionality and be compatible with the Arduino framework.

• XIAO SAMD21

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