Driver for a Microchip MCP23017 (I2C) or MCP23S17 (SPI) bus expander..
The MCP23017 is a 16-bit I2C port expander and the MCP23S17 is an 16-bit SPI port expander where each of the bits can function as either an input or an output.
All correct at time of writing, but as always, manufacturers love to move things around on their website.
This code has been tested using a SolderCore controlling a SenseCore.
|MCP23017_I2C_ADDR||8-bit I2C address for MCP23017|
|mcp23x17_initialize_i2c||Initialize bus expander on I2C bus|
|mcp23x17_initialize_spi||Initialize bus expander on SPI bus|