97 lines
4.6 KiB
Markdown
97 lines
4.6 KiB
Markdown
ADB to USB keyboard converter
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=============================
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This firmware converts ADB keyboard protocol to USB.
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You can use PJRC Teensy for this converter, though, other USB AVR(ATMega32U4, AT90USB64/128 or etc) should work.
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But binary size is about 10KB or more it doesn't fit into 8K flash like ATMega8U2.
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Discuss: http://geekhack.org/showwiki.php?title=Island:14290
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Wiring
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------
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0. Connect ADB keyboard to Teensy by 3 lines(Vcc, GND, Data). By default Data line uses port PD0.
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This converter uses AVR's internal pull-up, but it seems to be too weak, in particular when you want to use a long or coiled cable.
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The external pull-up resistor(1K-10K Ohm) on Data is strongly recommended.
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1. Define following macros for ADB connection in config.h if you use other than port PD0.
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ADB_PORT, ADB_PIN, ADB_DDR, ADB_DATA_BIT
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2. make
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3. program Teensy
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Build
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-----
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Just make
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$ make clean
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$ make
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If your keyboard is ISO layout
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$ make KEYMAP=iso
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LOCKING CAPSLOCK
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----------------
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Many of old ADB keyboards have mechanical push-lock switch for Capslock key and this converter supports the locking Capslock key by default. See README in top directory for more detail about this feature.
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Also you may want to remove locking pin from the push-lock switch to use capslock as a normal momentary switch.
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http://www.youtube.com/watch?v=9wqnt2mGJ2Y
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Keymap
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------
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You can change a keymap by editing code of keymap.c like following.
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This is a keymap for AEK, however, also used for other keyboards.
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How to define the keymap is probably obvious. You can find key symbols in keycode.h.
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If you want to define some keymaps than just one, see hhkb/keymap.c and
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macway/keymap.c as examples. Keymap(layer) switching may needs a bit of
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effort at this time.
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/* Default Layer: plain keymap
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* ,---. ,---------------. ,---------------. ,---------------. ,-----------. ,---.
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* |Esc| |F1 |F2 |F3 |F4 | |F5 |F6 |F7 |F8 | |F9 |F10|F11|F12| |PrS|ScL|Pau| |Pwr|
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* `---' `---------------' `---------------' `---------------' `-----------' `---'
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* ,-----------------------------------------------------------. ,-----------. ,---------------.
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* | `| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|Backspa| |Ins|Hom|PgU| |NmL| =| /| *|
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* |-----------------------------------------------------------| |-----------| |---------------|
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* |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| \| |Del|End|PgD| | 7| 8| 9| -|
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* |-----------------------------------------------------------| `-----------' |---------------|
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* |CapsLo| A| S| D| F| G| H| J| K| L| ;| '|Return | | 4| 5| 6| +|
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* |-----------------------------------------------------------| ,---. |---------------|
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* |Shift | Z| X| C| V| B| N| M| ,| ,| /|Shift | |Up | | 1| 2| 3| |
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* |-----------------------------------------------------------| ,-----------. |-----------|Ent|
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* |Ctrl |Alt |Gui | Space |Gui |Alt |Ctrl | |Lef|Dow|Rig| | 0| .| |
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* `-----------------------------------------------------------' `-----------' `---------------'
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*/
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KEYMAP(
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ESC, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, PSCR,SLCK,BRK, PWR,
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GRV, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, MINS,EQL, BSPC, INS, HOME,PGUP, NLCK,EQL, PSLS,PAST,
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TAB, Q, W, E, R, T, Y, U, I, O, P, LBRC,RBRC,BSLS, DEL, END, PGDN, P7, P8, P9, PMNS,
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LCAP,A, S, D, F, G, H, J, K, L, SCLN,QUOT, ENT, P4, P5, P6, PPLS,
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LSFT,Z, X, C, V, B, N, M, COMM,DOT, SLSH, RSFT, UP, P1, P2, P3,
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LCTL,LGUI,LALT, SPC, LEFT,DOWN,RGHT, P0, PDOT,PENT
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),
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Magic command
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-------------
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To get help press `h` holding Magic key. Magic key is `Power key`.
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Notes
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-----
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Not-extended ADB keyboards have no discrimination between right modifier and left one,
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you will always see left control even if you press right control key.
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Apple Extended Keyboard and Apple Extended Keyboard II can discriminate both side
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modifiers except for GUI key(Windows/Command).
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And most ADB keyboard has no diodes in its matrix so they are not NKRO,
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though ADB protocol itself supports it. See protocol/adb.c for more info.
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If keyboard has ISO layout you need to use ISO keymap with `make KEYMAP=iso`. With ANSI
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keymap you will suffer from swapped keys problem.
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https://github.com/tmk/tmk_keyboard/issues/35
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EOF
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