Adafruit MCP23017 Library
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This is a library for the MCP23008/17 I2C and MCP23S08/17 SPI port expanders. Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Written by Carter Nelson for Adafruit Industries.
BSD license, all text above must be included in any redistribution