Tutorial 10 - writing your own port classes

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.

keybrd tutorial by Wolfram Volpi is licensed under a Creative Commons Attribution 4.0 International License.
Permissions beyond the scope of this license may be available at https://github.com/wolfv6/keybrd/issues/new.