Tutorial 10 - writing your own port classes
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Port classes are the keybrd library's interface to I/O expander ports.

To write your own port classes:

1. Get a copy of the controller or I/O expander datasheet.
2. Study other keybrd Port classes.

For example, the keybrd_DH library use these keybrd classes for its PCA9655E I/O:
* PortWrite_PCA9655E
* PortRead_PCA9655E
* LED_PCA9655E

Debugging I/O expander code is hard because SPI or I2C protocol adds a level of indirection.
If you haven't written Arduino code for an I/O expander before, learn from an Arduiono I/O expander tutorial before attempting it here.

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