ESP8266 Library for the MCP23S17 SPI 16bit I/O Expander
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README.md

ESP8266 Microchip MCP23S17 Driver

Supports the Microchip MCP23S17 SPI I/O expanders.

Enables the use of up to 128 additional GPIO pins through the SPI bus.

Supports up to 8x MCP23S17 (16 GPIO) chips on the one SPI bus for a total of up to 128 GPIO pins.

Mixing MCP23S08 and MCP23S17 chips on one bus is not currently supported.

Requires my SPI driver: https://github.com/MetalPhreak/ESP8266_SPI_Driver