The code for the Advanced Microcontroller Topics Workshop #1: Registers
This project contains a simple program for the TM4C123GH6PM microcontroller that will blink the onboard RGB led. No 3rd party libraries are used to control the GPIO; instead, to illustrate the operation of the memory-mapped peripheral registers, direct access on these registers is employed to control the GPIO. The program also implements its own delay function, which puts the processor into a busy loop for a fixed number of iterations.
The extra credit assignment for this project is to get the LED to toggle when the user presses one of the onboard pushbuttons. PF0 and PF4 are connected to the onboard pushbuttons on the EK-TM4C123GXL development kit, and they are active LOW. There is no external pullup resistor, so you have to configure the internal pullup. You also need to investigate how to debounce the buttons.
The presentation slides that accompany this code can be viewed here.