[PD] GPIO pi-extras

[steiner at block4.com]

Hi,

I wrote an external to read in values from a MCP3208 A/D converter IC 
via SPI on the GPIOS of a Raspberry Pi

https://github.com/HerrSteiner/wiringPD

its based on PD-Wiring Pi by Jaime Oliver La Rosa and research on 
diverse forum threads.

Cheers,

Malte