The Raspberry Pi has a set of General Purpose I/O (GPIO) pins that you can use to control homemade electronic projects. Most of the Raspberry Pi starter kits include a breadboard and a few electronic components to play with. In this chapter, we will look at programming GPIO pins from Assembly language.
We will experiment with a breadboard containing a number of LEDs and resistors, so we can write some real code. We will program the GPIO pins two ways, firstly by using the included Linux device driver and secondly by accessing the GPIO controller’s registers directly.
