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Alternative Controller for HHKB Pro
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===================================
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I wanted to add some features like vi cursor and mouse keys to my [HHKB][HHKB] but its controller is not programmable and
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firmware source code is not open, of course. This means customizing this keyboard needs to replace original
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controller with programmable one. For this purpose I used PJRC [Teensy++][Teensy] as alternative controller.
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[HHKB]: http://www.pfu.fujitsu.com/hhkeyboard/
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[Teensy]: http://www.pjrc.com/teensy/
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My keyboard firmware source tree is here: http://github.com/tmk/tmk_keyboard
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See directory keyboard/hhkb to build firmware for HHKB.
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##Features
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* Customizable keymap
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* More keymap layers(more Fn keys)
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* Mouse keys
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* USB NKRO
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###Pros
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* Without PCB trace cutting, case mod or any destructives
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* Can keep original controller intact
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* Can change all HHKB behaviour as you like
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###Cons
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* Void your warranty
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* Lose USB hub function in case of Pro2
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##DISCLAIMER
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I'm not a professional of electronics or MCU programming. This may damage your HHKB.
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And my English writing is poor, I'm not sure I can convey my notions accurately.
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##Build Firmware
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You can choose some combination of MCU and USB protocol stack.
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### Teensy++(AVR USB family) with [LUFA]
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0. Edit **matrix.c** to use your pin configuration. See doc/HHKB.txt for detail.
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1. Edit **keymap.c** to use your favoirte keymap.
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2. Edit **Makefile** if you want to use other `MCU` than Teensy++ 2.0.
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3. Build firmware binary file:
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`$ make -f Makefile.lufa`
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4. Program MCU with PJRC [Teensy Loader] tool. If you install command line version of the loader just run:
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`$ make -f Makefile.lufa teensy`
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[LUFA]: http://www.fourwalledcubicle.com/LUFA.php
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[Teensy Loader]: http://www.pjrc.com/teensy/loader.html
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###AVR Mega with [V-USB]
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Follow below if you want to use AVR with V-USB as .
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0. Edit **matrix.c** to use your pin configuration. See doc/HHKB.txt for detail.
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1. Edit **keymap.c** to use your favoirte keymap.
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2. Edit **usbconfig.h** to configure V-USB options.
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3. Edit **Makefile.vusb** to define `MCU` and `F_CPU`.
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4. Build firmware binary file:
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`$ make -f Makefile.vusb`
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5. Program MCU with AVR programmer like AVRISPmkII. If you already have [USBaspLoader] on MCU just run:
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`$ make -f Makefile.vusb program`
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[V-USB]: http://www.obdev.at/products/vusb/index.html
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[USBaspLoader]: http://www.obdev.at/products/vusb/usbasploader.html
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###How to Customize Keymap
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Later...
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See **keymap.c**.
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##Hardware
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###Teensy++ installation
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Angled USB mini B adapter is used to install Teensy++ laterally.
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Bread baord wires are used to connect Teensy++.
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###PJRC Teensy++ 2.0 connection
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+---------------+
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| Teensy++ |
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| | HHKB
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| | ~~~~
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| PB0-2|------->ROW(6-8)
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| PB3-5|------->COL(9-11)
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| PB6|------->ENABLE(12)
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| PE6|<-------KEY(4)
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| PE7|------->PREV(5)
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+---------------+
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###V-USB circuit
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+---+ +---------------+
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USB GND | | ATmega168 |
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~~~ C3 | |
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5V <-------+--------+---|Vcc,AVCC | HHKB
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R1 | | ~~~~
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D- <----+--+-----R2-----|INT1 PB2-4|------->ROW(6-8)
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D+ <----|---+----R3-----|INT0 PC0-2|------->COL(9-11)
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Z1 Z2 | PC3|------->ENABLE(12)
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GND<----+---+-----------|GND PB0|<-------KEY(4)
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| PB1|------->PREV(5)
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GND+-C2--+--|XTAL1 RXD|------->Debug Console
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X1 | TXD|<-------Debug Console
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GND+-C3--+--|XTAL2 RST|---SW--+GND
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+---------------+
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R1: 1.5K Ohm
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R2,R3: 68 Ohm
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Z1,Z2: Zener 3.6V
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C1,C2: 22pF
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C3: 0.1uF
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X1: Crystal 20MHz(16MHz/12MHz)
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SW: Push Switch(Optional for bootloader)
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