Documentation on IO expanders?

• IIICC

  9 37 2.6 C

  Three split ergo keyboard with macropad running QMK

For a working I2C expander based keyboards you can check my IIIC and Chordie. Sadly you can't get away from writing your own matrix scanning as there's no easy way to make reading I2C expander states in QMK. MCP23017 and MCP23018 have the same register addresses so there's no problem with moving the code between those two.

• Chordie

  12 224 4.1 C

  A chording keyboard you shouldn't be scared of

For a working I2C expander based keyboards you can check my IIIC and Chordie. Sadly you can't get away from writing your own matrix scanning as there's no easy way to make reading I2C expander states in QMK. MCP23017 and MCP23018 have the same register addresses so there's no problem with moving the code between those two.

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