Using The PiFace In A C Project

Schematic

A schematic is available here.

Setup The RPI Ready To Use The PiFace

PiFace uses the SPI port.  Enable the SPI port following the instructions here.

C Source Code

Our C driver for the PiFace can be downloaded from GitHub here.

We also have a version which allows PiFace inputs to be used as outputs and allows sequential writing to them here.