History

tmk 63c03dc137 Change keymap API		12 years ago
..
doc	Improve documentation	12 years ago
Makefile.iwrap	Fix HHKB iWRAP build	12 years ago
Makefile.lufa	Add initial fix for new keymap.	12 years ago
Makefile.pjrc	Add Makefile.lufa to keyboard/hhkb and hbkb.	13 years ago
Makefile.vusb	Add initial fix for new keymap.	12 years ago
README.md	Fix image link 3 :(	12 years ago
config.h	Clean code.	12 years ago
config_iwrap.h	Fix HHKB iWRAP build	12 years ago
config_vusb.h	Fix build option MOUSEKEY_ENABLE.	12 years ago
iwrap.txt	Improve documentation	12 years ago
keymap.c	Change keymap API	12 years ago
led.c	Made directories for keyboard and converter projects.	13 years ago
matrix.c	Add initial fix for new keymap.	12 years ago
usbconfig.h	Made directories for keyboard and converter projects.	13 years ago

README.md

Alternative Controller for HHKB Pro

I wanted to add some features like vi cursor and mouse keys to my HHKB but its controller is not programmable and firmware source code is not open, of course. This means customizing this keyboard needs to replace original controller with programmable one. For this purpose I used PJRC Teensy++ as alternative controller.

My keyboard firmware source tree is here: http://github.com/tmk/tmk_keyboard See directory keyboard/hhkb to build firmware for HHKB.

##Features

Customizable keymap
More keymap layers(more Fn keys)
Mouse keys
USB NKRO

###Pros

Without PCB trace cutting, case mod or any destructives
Can keep original controller intact
Can change all HHKB behaviour as you like

###Cons

Void your warranty
Lose USB hub function in case of Pro2

##DISCLAIMER I'm not a professional of electronics or MCU programming. This may damage your HHKB. And my English writing is poor, I'm not sure I can convey my notions accurately.

##Build Firmware You can choose some combination of MCU and USB protocol stack.

Teensy++(AVR USB family) with LUFA

Edit matrix.c to use your pin configuration. See doc/HHKB.txt for detail.
Edit keymap.c to use your favoirte keymap.
Edit Makefile if you want to use other MCU than Teensy++ 2.0.
Build firmware binary file: $ make -f Makefile.lufa
Program MCU with PJRC Teensy Loader tool. If you install command line version of the loader just run: $ make -f Makefile.lufa teensy

###AVR Mega with V-USB Follow below if you want to use AVR with V-USB as .

Edit matrix.c to use your pin configuration. See doc/HHKB.txt for detail.
Edit keymap.c to use your favoirte keymap.
Edit usbconfig.h to configure V-USB options.
Edit Makefile.vusb to define MCU and F_CPU.
Build firmware binary file: $ make -f Makefile.vusb
Program MCU with AVR programmer like AVRISPmkII. If you already have USBaspLoader on MCU just run: $ make -f Makefile.vusb program

###How to Customize Keymap Later... See keymap.c.

##Hardware

###Teensy++ installation Angled USB mini B adapter is used to install Teensy++ laterally.

Bread baord wires are used to connect Teensy++.

###PJRC Teensy++ 2.0 connection +---------------+ | Teensy++ | | | | | HHKB | | ~~~~ | PB0-2|------->ROW(6-8) | PB3-5|------->COL(9-11) | PB6|------->ENABLE(12) | PE6|<-------KEY(4) | PE7|------->PREV(5) | | | | | | +---------------+

###V-USB circuit +---+ +---------------+ USB GND | | ATmega168 | ~~~ C3 | | 5V <-------+--------+---|Vcc,AVCC | HHKB R1 | | ~~~~ D- <----+--+-----R2-----|INT1 PB2-4|------->ROW(6-8) D+ <----|---+----R3-----|INT0 PC0-2|------->COL(9-11) Z1 Z2 | PC3|------->ENABLE(12) GND<----+---+-----------|GND PB0|<-------KEY(4) | PB1|------->PREV(5) | | GND+-C2--+--|XTAL1 RXD|------->Debug Console X1 | TXD|<-------Debug Console GND+-C3--+--|XTAL2 RST|---SW--+GND +---------------+ R1: 1.5K Ohm R2,R3: 68 Ohm Z1,Z2: Zener 3.6V C1,C2: 22pF C3: 0.1uF X1: Crystal 20MHz(16MHz/12MHz) SW: Push Switch(Optional for bootloader)