Raspberry Pi side

For SPI on the Raspberry Pi, we will be using the wiringpi library.

https://projects.drogon.net/raspberry-pi/wiringpi/

Installing the library

No Debian package is available, so you have to go straight to the source.

git clone git://git.drogon.net/wiringPi
cd wiringPi
git pull origin
cd wiringPi
./build

Using the library

Before running any code that uses SPI, the driver must first be initialized.

sudo gpio load spi