These pins are meant to be used to read digital signals coming from a quadrature encoder.
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💡 These pins are set as INPUT by CrcLib::Initialize(). No CrcLib functions has currently been prepared to be used with these pins, but they can be used with any encoder library. We recommend using Paul Stoffregen’s library named Encoder, as detailed here.
</aside>
Rotary Encoders - How it works, How to use it with Arduino - Latest Open Tech From Seeed
Arduino Playground - RotaryEncoders
CRC_ENCO_A (physically aligned w/ the “MISO” mark)CRC_ENCO_B (physically aligned w/ the “MOSI” mark)