mirror of
https://github.com/qmk/qmk_firmware
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103 lines
3.1 KiB
Markdown
103 lines
3.1 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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README FIRST
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------------
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https://github.com/tmk/tmk_keyboard
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https://github.com/tmk/tmk_keyboard/tree/master/converter/adb_usb
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Also check these when you are in trouble.
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https://github.com/tmk/tmk_keyboard/wiki
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https://github.com/tmk/tmk_keyboard/labels/NOTE
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Wiring
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------
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Connect ADB pins to controller just by 3 lines(Vcc, GND, Data). By default Data line uses port PD0.
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ADB female socket from the front:
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,--_--.
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/ o4 3o \ 1: DATA
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| o2 1o | 2: Power SW
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- === - 3: VCC
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`-___-' 4: GND
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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. The external pull-up resistor(1K-10K Ohm) on Data is strongly recommended.(It is almost must!)
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https://github.com/tmk/tmk_keyboard/wiki/FAQ#pull-up-resistor
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Pull-up resister:
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Keyboard Conveter
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,------.
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5V------+------|VCC |
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[R] | |
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Signal--+------|PD0 |
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GND------------|GND |
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`------'
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R: 1K Ohm resistor
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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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Build
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-----
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See doc/build.md. In short,
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$ make clean
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$ make
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You can select keymap(ansi is default) like this:
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$ make KEYMAP=[ansi|iso|hasu]
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Keymap
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------
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You can change a keymap by editing code of keymap_[ansi|iso|hasu|yours].c.
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How to define the keymap is probably obvious. You can find key symbols in common/keycode.h. And see doc/keymap.md for more detail.
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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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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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https://github.com/tmk/tmk_keyboard/blob/master/README.md#mechanical-locking-support
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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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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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