BBB-PRU

This is an example program to figure out how to program the PRU units in the Beagle Bone Black.

DEPRECATION NOTICE: The code in this repo is more up-to-date and probably more useful.

3rd party tools that are needed.

The vendors/am335x_pru_package directory includes a driver and assembler that can be used to generate and load binaries to be ran on the PRUs. The vendors/install.sh script takes care of compiling and installing it.

The vendors/pru_2.0.0B2 directory should contain the C compiler for generating binaries to run in the PRU. However TI's licence prevents redistribution of it so you have to manually download it from here and run the installer script. This will generate a pru_2.0.0B2 directory which you'll have to move into vendors/pru_2.0.0B2. vendors/install.sh copies some files from here to system-wide directories for convenience.

Writing PRU assembly code.

Look at the app-assembler example.

Writing PRU C code

Look at the app-c example.

Links:

http://www.embeddedrelated.com/showarticle/586.php
http://www.embeddedrelated.com/showarticle/603.php
https://github.com/texane/pru_sdk
https://github.com/BeaglePilot/PRUSS-C
https://github.com/beagleboard/am335x_pru_package
https://github.com/VegetableAvenger/BBBIOlib http://processors.wiki.ti.com/index.php/PRU_Assembly_Instructions
http://processors.wiki.ti.com/index.php/PRU_Assembly_Reference_Guide
AM335x SitaraTM Processors Technical Reference Manual

Objectives

1. How to compile and run assembly code for the PRU? [DONE]
2. How to communicate between a host application (linux app) and the code running in the PRU? Interrupt based, please. [DONE]
3. How to do all of this stuff in C instead of assembly? [DONE]
4. How to use GPIOs? [DONE]
5. ADCs?
6. Hardware Timers?

License

GPLv3