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Welcome to the ChibiOS-RPi wiki!

This is an experimental port of ChibiOS to the Raspberry Pi platform.

Getting Started Guide

Current Status

Device Driver	Status	Notes
Port (GPIO)	Implemented
Serial (mini-UART)	Implemented
I2C	Implemented
SPI	Implemented	LoSSI not supported yet
System Timer	Implemented	Thread preemption
GPT (General Purpose Timer)	Implemented
Real-time Clock (RTC)	Implemented	Requires external device (DS1307)
Watchdog Timer	Implemented	Supports software reset.
PWM	Work in Progress

Several devices have been tested with the device drivers. If you have successfully used other devices with ChibiOS/RT on the Pi, please send me a note and I'll add it to the list.

Device	Protocol	Description
TMP102	I2C	Digital Temperature Sensor Breakout
MCP4725	I2C	12-Bit Digital to Analog Converter (DAC)
MCP3008	SPI	8-Channel 10-Bit Analog to Digital Converter (ADC)
DS1307	SPI	Real Time Clock (RTC)
FTDI Serial Adapter	Serial	Mini-UART access via the pin header
Onboard LED (green)	Port	Also used with external LEDs.

Running the Code

An example application is in demos/demos/ARM11-BCM2835-GCC. This example creates one thread to blink the onboard LED and another thread to support a very simple command shell.

Assuming you have a suitable cross compiler installed, you can just run the make file in the application directory and it will build the application (build/ch.bin). Adding EXTENDED_SHELL=yes to the make command line will compile in several extra commands for the ChibiOS shell but will also increase the bin file size from about 11 kb to about 45 kb.

You can run the application from the SD card, but I prefer to use David Welch's bootloader05 (code) with an FTDI breakout board (https://www.sparkfun.com/products/9873).

Near Term Objectives

• Finish PWM
• Investigate integrating Alan Chadwick's USB code (https://github.com/Chadderz121/csud)
• Add SD card support
• Add LAN support

Additional Resources