geekhack Projects > Making Stuff Together!
TMK ADB to USB keyboard converter
hasu:
--- Quote from: hasu;279286 ---No, I don't mind at all.
--- End quote ---
kps,
I misinterpreted your first sentence :)
Sorry. I attached my hex.
--- Quote from: Soarer;279367 ---That's a messy problem :(
I suppose the only solution is to send two packets for each change in state of the caps lock - one with the key down, and then one with the key up a millisecond or so later.
That appears to be how the Belkin adapter handles it.
What a hassle though!
--- End quote ---
Belkin solution will be a problem for someone who want to remap the key.
But it may be good for most people.
I prefer switch conversion solution though it is not for everyone.
Soarer:
--- Quote from: hasu;279388 ---Belkin solution will be a problem for someone who want to remap the key.
But it may be good for most people.
I prefer switch conversion solution though it is not for everyone.
--- End quote ---
Yes, that would be better.
But... I have a Macally MK96, and it already has a non-locking switch for caps lock! Its keyboard firmware must simulate the locking action, I guess. I don't know how many other ADB keyboards do a similar thing, but the only way to get a normal key action with them would be to replace the keyboard controller (which is what I will do :) ).
kps:
--- Quote from: hasu;279388 ---kps, I misinterpreted your first sentence :)
--- End quote ---
Sorry, my fault for using idiomatic English.
Thank you; that has helped me narrow down my problem somewhat.
I hacked in some ugly code to send a Shift directly when the power key is pressed, and that worked. With a logic probe, I see "chatter" on the ADB line on the other port of the keyboard, so I think my connections are sound. I suspect my problem may be either noise or timing related, since (by using the LED on the Teensy) it seems I never get past the if (read_bit()) // Stopbit(0) in adb_host_kbd_recv().
hasu:
--- Quote from: kps;279449 ---
I hacked in some ugly code to send a Shift directly when the power key is pressed, and that worked. With a logic probe, I see "chatter" on the ADB line on the other port of the keyboard, so I think my connections are sound. I suspect my problem may be either noise or timing related, since (by using the LED on the Teensy) it seems I never get past the if (read_bit()) // Stopbit(0) in adb_host_kbd_recv().
--- End quote ---
My code is very primitive and have not been checked its signal conformity
by logic analyzer nor oscilloscope, thus it could lose the sync under some circumstances.
Another possibility I come up with is port damage of your Teensy.
My Teensy actually lost one port by latch-up while prototyping/debug :)
If your DATA line port is suspicious, you should try another port.
kps:
--- Quote from: hasu;279835 ---My code is very primitive and have not been checked its signal conformity by logic analyzer nor oscilloscope, thus it could lose the sync under some circumstances.
--- End quote ---
I may get out those tools next weekend. My logic analyzer is ancient (HP1615A, 1979) but should be adequate for ADB.
--- Quote ---Another possibility I come up with is port damage of your Teensy.
My Teensy actually lost one port by latch-up while prototyping/debug :)
If your DATA line port is suspicious, you should try another port.
--- End quote ---
I don't think that is the case, but I will check.
I do own an iMate, so this is not vital to me, but it might help other people later.
Later, I want to try using one of the cheap PS3 dongles with an AT90USB162. That, plus half an s-video cable, would make an ADB converter for under $10.
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