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It's aliiiiive! (for real, this time!)

A project log for USBiano Mk. I

Hacked-apart Casio + AT90USB162 + LUFA = Simple PC Piano

runnerpackRunnerPack 10/08/2014 at 16:280 Comments

Well, if this project wasn't in "hack territory" before – despite an actual hacksaw already having been part of the process ;) – it's definitely there now!

Yesterday, I removed all 32 "anti-ghosting" diodes, and reinstalled them the other way round (except for the one I broke, which I replaced with one from the ol' junk bin). I did this for a couple of reasons:

  1. Due to the AVR only having pull-up resistors available on the inputs, the diodes forced me to scan the eight columns, and read the four row inputs, meaning each complete scan took eight iterations of a for loop. Now that the columns are connected to inputs, I can scan the rows, which results in a loop with only four iterations – a 50% speed-up!
  2. Using the simplest wiring layout, the keyboard is logically laid out as rows of columns. By scanning the columns and reading the rows, I received every eighth key, compressed into a nybble. I didn't technically have to, but to make the key-code map easier to edit, I was unpacking these nybbles to represent consecutive keys as consecutive bits. I suspected that this was the source of my "shifted-columns" problem (although I still have no idea what, exactly, was causing it).

With the above changes to the hard- and firmware complete, it works great! As for the source, I think I'll skip github and just share an archive of the four files that differ from the LUFA keyboard demo (Demos/Device/ClassDriver/Keyboard in the LUFA package, at time of writing) and the .hex file (although, according to various web searches, I appear to be the only person on the planet still using an AT90USB162 at all, much less this particular carrier board :P).

Since I can't attach (non-image) files to the Hackaday.io project, and I don't want to maintain the file on an external hosting service, and the file is so small, I'm going to include a Base64 encoded version of "usbiano.zip" at the end of this post.

To use it:

  1. Build the hardware
  2. Download and install WinAVR
  3. Download LUFA
  4. Unzip it into a folder called "LUFA"
  5. Copy the keyboard demo folder mentioned above into the folder containing the above "LUFA" folder
  6. Covert the Base64 data back into a .ZIP file, and unzip it into the new Keyboard folder, preserving its folder structure and overwriting existing files.
  7. Open a terminal (I use the Mingw32 terminal installed as part of the RubyInstaller.org devkit), change to the project folder, and run "make"
  8. Flash the resulting .hex to your device and reset it to make it show up as a "USBiano Keyboard"
  9. Run OpenMPT and rock out!

The Code:

UEsDBBQAAAAAAAu+OEUAAAAAAAAAAAAAAAAGAAAAQm9hcmQvUEsDBBQAAAAIAHO+OEV/m4I5agIA
AFMFAAANAAAAQm9hcmQvQm9hcmQuaK1STW/bMAw9x7+CSy9t2ijbsNNObZ1+BEjToWhP7WDIEh1r
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