A complete library for Microchip MCP23018 http://ww1.microchip.com/downloads/en/DeviceDoc/22103a.pdf, a 16 port I/O GPIO with Interrupt, open drain version that works by using just 2 shared CPU pins by using I2C
The library can be easily included in other libraries, has methods that let's you change ports values fastly and you can easily access chip register directly.
This library has been extracted from my universal gpio_library and I will maintain separately.
I have included several examples but a complete wiki and detailed images will be published soon.
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A complete library for Microchip MCP23018