This page documents research on creating a userspace executable using the wiring and Processing language used with Arduino.
The examples have been tested to work on production images later than 2013.06.20. You will need a 4 GB (or greater) microSD card for flashing the Beaglebone Black, a process which may take well over 45 minutes. It is documented on the CircuitCo wiki. If you are unsure which image is currently loaded on the Beaglebone Black, check it at http://www.crashcourse.ca/wiki/index.php/Examining_your_BBB_install_version.
~$ wget http://www.angstrom-distribution.org/toolchains/angstrom-2011.03-x86_64-linux-armv7a-linux-gnueabi-toolchain.tar.bz2 ~$ sudo tar -C / -xzf angstrom-2011.03-x86_64-linux-armv7a-linux-gnueabi-toolchain.tar.bz2 ~$ export PATH=/usr/local/angstrom/arm/bin:$PATH ~$ export CROSS_COMPILE=arm-angstrom-linux-gnueabi-
Links to 64 and 32 bit versions of Angstrom toolchain.
- Clone the repo from https://github.com/prpplague/Userspace-Arduino
Running a demo
Running Blink LED program:
cd Userspace-Arduino/arduino-makefile/examples/BlinkUserspace make
- A binary BlinkUserspace.elf should be created in a directory build-userspace
- send-exec is an upload and execute script, which is integrated with the Arduino-Userspace repository. It uses the scp protocol to copy binaries to the Beaglebone Black over USB/ethernet and execute it. You can find it in the utility folder.
- To use it, simply do
- You will now see USR LED 1 blinking at one second intervals. Press Ctrl-C to break from the loop.
- Check out some of the examples in /path/to/Userscape-Arduino/Arduino-Makefile/examples.
Setup SSH keys (optional)
- If you want to avoid a password prompt, you can set up the ssh keys for the Beaglebone Black:
cd ~/.ssh ssh-keygen -t dsa #set a password or you can leave it blank ssh-copy-id -i ~/.ssh/id_dsa.pub root@$192.168.7.2 # replace id_dsa.pub by your public key file if some other name is given ssh email@example.com # login and enter password once
Here after, you won't be prompted for a password from this machine
Initial development is being done with the Beaglebone Black and the Bacon Cape
- if you have your Beaglebone Black loaded with a firmware image older that 07.11.2013, you will need copy the Bacon Cape dtbo file on to your beaglebone black
~# scp ~/Downloads/BB-BONE-BACONE-00A0.dtbo firstname.lastname@example.org:/lib/firmware/BB-BONE-BACONE-00A0.dtbo
|Arduino Pin||BBB Header Pin||Function||Alternate Function|
|14||USR LED 0||LED|
|15||USR LED 1||LED|
|16||USR LED 2||LED|
|17||USR LED 3||LED|
- Initial support started
- Need Lure accessory board for testing
- support planned
- will use RPi_Gertboard for initial development
Action List and Issues
- The Arduino 1.5 IDE has better support for arbitrary architectures than the Energia fork of Arduino. This could help since the architecture specific stuff has been moved to config files. Further investigation is needed. Should the Userspace implementation forked directly out of the Arduino IDE or should the current implementation continue?
- For development beyond the GSOC period, an option to get this upstream needs to be considered.
- The BBB needs a separate FTDI cable for serial ports. However, a /dev/ttyACM port is available over USB. It can be used for uploading via the normal bootloader way. After the upload, it can be used for serial read/write to the host (PC).
- A single protocol to tackle uploading via USB and ethernet and may not be feasible. Networking over USB is pretty unreliable and tough for newbies to get working. For ethernet upload, several of the above options can be considered. For USB, a simple bootloader emulator will do.