Enabling SPI

PiFace products need the SPI pins on the Raspberry Pi to be enabled in order to function, this is simple enough to do. To enable the SPI, you must update to the latest version of the raspi-config tool, so open a Terminal and use the command
sudo apt-get install raspi-config
and enter Y when required.

Now start raspi-config by typing
sudo raspi-config

To view the list of advanced configuration options, select Option 8 Advanced Options.
Choose the A5 SPI option. Set this to "Yes"
Select "Ok" then "Finish"

Troubleshooting: If your raspi-config command did not work, or the SPI option was not listed, then make sure you have updated your copy of Raspbian With this.