I have been working on this device for a while, and have come up with the following:

The protocol is simple:

?? ?? 52 70 ?? ?? ??
??
KC 1 [DOWN]
?? ?? 52 70 ?? ?? ??

KC      Key
48      1
49      2
50      3
51      4
52      5
53      6
54      7
55      8
56      9
57      Mode A
58      Mode B

The ?? bits represent seemingly random numbers that appear through /dev/input/event3, which gets created when the keyboard is plugged in.

I'm in the process of creating a userland application that reads from /dev/input/event3 and acts accordingly, based on user preferences.

Should it be the job of the kernel to do the command mapping (and subsequently create a virtual keyboard), or should it stay as a userland-only program?

I would be intrigued to know.

Chris

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature

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