arduino-mcp23017

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Don't hide I2C error status.

1

Prior to this PR, most functions in the MCP23017 API fail silently, despite the I2C Wire libs error status return code. Now, like other I2C slave driver libs, the return...

dok-net

According to the issue SoftwareSerial: Make the bus more general => SPI / I2C (HW and SW)

2

There is also a SPI version of that chip. Why not implementing that chip also?

Beerlesklopfer

add constructor without arguments

4

i tried to pass an instance of MCP23017 by reference to the constructor of another class. Doing this seems to require a constructor without arguments. I added the constructor without...

rolgordijn

Some adaption

2

Hey thanks for this very useful library! In an existing hardware project I needed to replace a MCP23017 chip by its SPI counterpart MCP23S17. Although I could not find a...

felix1024

I rewrote the library into a base-classed one, and added the SPI-based MCP23S17 based on Felix's implementation of just the readRegister/writeRegister functions. It should be live at my [repo](https://github.com/waltje/Arduino.IOExpander) .....

waltje