This repository contains a series of bare-metal examples for the Raspberry Pi (http://raspberrypi.org/). The examples are numbered from simple to complex and many of the later examples reuse the earlier ones, especially the UART.
Each example can be build running make inside it's directory using a cross compiler prefixed with "arm-none-eabi-", e.g. arm-none-eabi-gcc, which must be in the PATH. You can export CROSS or CC and CXX to use a different compiler. You can also run make in the top directory to build them all.
Each example builds some object files, links them into a *.elf file and creates a bootable *.img file from that. The *.img file you can copy to your SD card to try it. The first few example are build in multiple flavors for the different Raspberry Pi models and you have to choose the one for your Raspberry Pi. If you pick the wrong one nothing bad will happen but they also just wont work. After the auto-detect example everything will detect which Raspberry Pi model is being used automatically (that I know of at the time of writing).
Enjoy, Goswin von Brederlow
PS: Checkout raspbootin if you don't want to take out the SD card for every new image you want to try. It allows you to upload the image over serial.
| Directory | Description |
|---|---|
| 001-twinkle-twinkle-little-led | Turn the activity LED repeadetly on and off forever |
| 002-hello-lo-lo-lo | Output some text on the UART and then echo all input |
| 003-can-you-c-me | Output some text on the UART and then echo input (in C) |
| 004-a-t-a-and-g-walk-into-a-baremetal | Parse boot arguments and detect Raspberry Pi model |
| 005-the-fine-printf | Introducing the family of printf functions |
| 006-you-are-exceptional | Add exception handling |
| 007-licensed-to-chill | Using the timer interrupt to sleep |
| 008-trust-but-verify | Dotting all the i's and crossing all the t's |