It is now official the EvalBotADK code is available like promised on GitHub and it is open source using GPL v2.
It is the public release of USB Host Driver for Android Open Accessory on EvalBot (it should work also with any other Stellaris ARM chipset supporting USB OTG with minor changes).
About Hardware Hack:
The EvalBot USB Host Power Supply has been hacked because by default it does not work with Usb Host which require more than 100/150mA (due to limitation of hardware) and so I have modified USB Power supply to use external power in order to connect any USB Host compliant with USB specification which allow current until 500mA.
This Hack also work with any hardware because it's done on a Usb Extension and a BreadBoard with External PowerSupply.
Hardware hack schematic details:
|Hardware Hack USB Extension External Power|
For Android software I have used DemoKit which is just a rebuild of sample in official Android NDK package see http://developer.android.com/guide/topics/usb/adk.html and download package here https://dl-ssl.google.com/android/adk/adk_release_0512.zip.
Later we could develop our own Android Application but for this release i just used existing DemoKit.
For EvalBot I have developed the Usb Host driver for Open Accessory and an example which communicate with DemoKit.
In order to build the code you should download and install following Texas Instrument packages (requires registration which is free):
- The code requires TI Code Composer v4 (I use Version: 4.2.4.00033) see http://www.ti.com/tool/ccstudio or directly
http://processors.wiki.ti.com/index.php/Download_CCS#Download_latest_production_CCSv4_DVD_image and choose "Download latest production CCSv4 DVD image" for the Licence see "Getting a License:" just after, it is totally free and there is no limitation in time or removed options.
- Usb Library: http://www.ti.com/tool/sw-usbl => I use SW-USBL-8049.exe which is installed in my example in F:/TI_EvalBot/SW-USBL-8049 3)
- EvalBot Firmare: http://www.ti.com/tool/sw-ek-evalbot => I use SW-EK-EVALBOT-7611.exe which is installed in my example in F:/TI_EvalBot/SW-EK-EVALBOT-7611
To simplify the development you can mount a virtual drive to F:\ using subst F:\ yourdrive\ or you will need to change paths defined hereafter.
Following Linked resource are required in Code Composer Project(file .project):
Following Include Options are required in Code Composer Project(file .cdtbuild):
What feature included for this new demo:
- With EvalBot if you press Button Switch1, 2 or Bumper Left/Right it send the button/bumper state to DemoKit.
- With DemoKit you can send command (Relay1 or 2) to switch On/Off EvalBot Leds(Led1 & 2).
- With DemoKit Servo1=Speed for MotorLeft and Relay1=MotorLeft ON/OFF.
- With DemoKit Servo2=Speed for MotorRight and Relay2=MotorRight ON/OFF.
All the code is under GPLv2 and available on GitHub: See WebPage https://github.com/TitanMKD/EvalBotADK