231 lines
9.8 KiB
Plaintext
231 lines
9.8 KiB
Plaintext
Alternative Controller for HHKB pro
|
|
===================================
|
|
I want to add vi cursor and mouse keys to HHKB. Original HHKB controller is not programmable and
|
|
firmware source code is not open. So, customizing HHKB needs to replace original controller with programmable one.
|
|
I used Teensy++ as alternative controller. Though a Teensy has enough ports to drive HHKB,
|
|
Teensy++ has clean pinout and it makes programing and wiring easier.
|
|
|
|
This is just a proof of concept for replacing controller of HHKB, not a complete firmware.
|
|
|
|
My prototype firmware source tree is here:
|
|
branch: hhkb(http://github.com/tmk/tmk_keyboard/tree/hhkb)
|
|
This firmware is a port of my previous project:
|
|
HHKB style Mod(http://geekhack.org/showwiki.php?title=Island:11930)
|
|
PJRC(Teensy++/Teensy)
|
|
http://www.pjrc.com/teensy/
|
|
|
|
|
|
Pros:
|
|
* without pattern cuting, case mod and soldering
|
|
* can keep original controller intact
|
|
* can change HHKB behaviour as you like(by C programming)
|
|
|
|
Cons:
|
|
* void your warranty
|
|
* unavailability of Teensy++/Teensy(because of PS3 cracking boom?)
|
|
|
|
Features:
|
|
* customized keymap
|
|
* more keymap layers
|
|
* mouse keys for minimum mouse operation(never comfortable for normal use)
|
|
* and more...(in the future)
|
|
|
|
Any suggestions or ideas are welcome.
|
|
|
|
|
|
NOTE:
|
|
My HHKB is just "Professional". This means followings may not be applied to "Professional2".
|
|
DISCLAIMER:
|
|
I'm not a professional for electronics and MCU programming. This may damage your HHKB.
|
|
And my English writing is poor, I'm not sure I can convey my notions accurately.
|
|
|
|
|
|
Teensy++ installation
|
|
---------------------
|
|
Angled USB mini B adapter is used to install Teensy++ laterally.
|
|
(teensy_install.jpg)
|
|
|
|
Bread baord cables used for connect Teensy++.
|
|
(teensy_wiring.jpg)
|
|
(connector_contact.jpg)
|
|
|
|
|
|
HHKB internal
|
|
-------------
|
|
HHKB pro has two PCBs and some chips.
|
|
|
|
Controller PCB:
|
|
M38K07M4 Renesas MCU with USB function
|
|
http://documentation.renesas.com/eng/products/mpumcu/rej03b0192_38k0ds.pdf
|
|
(HHKB_controller.jpg)
|
|
|
|
Keyswitch PCB:
|
|
HC4051 Analog Multiplexer: select a row line.
|
|
http://www.alldatasheet.com/datasheet-pdf/pdf/203989/KODENSHI/KK74HC4051A.html
|
|
LS145 BCD Decoder: select a column line.
|
|
http://www.alldatasheet.com/datasheet-pdf/pdf/27373/TI/SN74LS145D.html
|
|
BU9831 Non-volatile electronic potentiometer: for calibration?
|
|
http://www.alldatasheet.com/datasheet-pdf/pdf/36387/ROHM/BU9831.html
|
|
TP1684 Capacitive Sensing controller: no datasheet available.
|
|
(HHKB_keyswitch.jpg)
|
|
Topre original chip?
|
|
(HHKB_TP1684.jpg)
|
|
|
|
|
|
Two PCBs are connected by 15 lines. Vcc/GND uses 3 lines each, 9lines for keyboard signaling.
|
|
|
|
Keyswitch PCB connector Teensy++ pins
|
|
-------------------------------------------------------------------------------
|
|
1 Vcc(5V) 5V
|
|
2 Vcc(5V)
|
|
3 Vcc(5V)
|
|
4 TP1684 KEY: Low(0) when key pressed PE6 input w/o pullup
|
|
5 TP1684 unknown:how to use PE7 input w/o pullup
|
|
6 HC4051 A(bit0) select 8 rows(0 to 7) PB0 output
|
|
7 HC4051 B(bit1) PB1 output
|
|
8 HC4051 C(bit2) PB2 output
|
|
9 LS145 A(bit0) select 8 columns(0 to 7) PB3 output
|
|
10 LS145 B(bit1) PB4 output
|
|
11 LS145 C(bit2) PB5 output
|
|
12 LS145 D(enable) Low(0) enable selected column PB6 output
|
|
13 GND
|
|
14 GND
|
|
15 GND GND
|
|
(HHKB_connector.jpg)
|
|
|
|
|
|
Keyswitch matrix
|
|
----------------
|
|
60 keyswitches in 8*8 matrix. ghost free. bounce free.
|
|
|
|
COL 0 1 2 3 4 5 6 7
|
|
ROW ---------------------------------------------------------------
|
|
0| 2 q w s a z x c
|
|
1| 3 4 r e d f v b
|
|
2| 5 6 y t g h n _NONE_
|
|
3| 1 Esc Tab Control LShift LAlt LMeta Space
|
|
4| 7 8 u i k j m _NONE_
|
|
5| \ ` Delete Return Fn RShift RAlt RMeta
|
|
6| 9 0 o p ; l , _NONE_
|
|
7| - + ] [ ' / . _NONE_
|
|
|
|
|
|
Matrix diagram:
|
|
+-------------------------+-+-+-+-+-+-+-+ Vcc
|
|
|bias control? - - - - - - - - ---
|
|
| 3.9K*8 R R R R R R R R |
|
|
+--------^+ +--------+ - - - - - - - - |
|
|
| TP 1684 | | HC4051 <0-------|-|-|-|-|-|-|-|--|R|-+
|
|
| |capa. | <1-------|-|-|-|-|-|-|-|--|R|-+
|
|
| |sense | <2-------|-|-|-|-|-|-|-|--|R|-+
|
|
| <------| <3-------|-|-|-|-|-|-|-|--|R|-+
|
|
| | | <4-------|-|-|-|-|-|-|-|--|R|-+
|
|
| | | <5-------|-|-|-|-|-|-|-|--|R|-+
|
|
| |calib.| <6-------|-|-|-|-|-|-|-|--|R|-+
|
|
| <-+? | <7-------|-|-|-|-|-|-|-|--|R|-+
|
|
+---V-----+ | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8
|
|
KEY ??? | A B C +-----------------+
|
|
| | +-^----+ | | | | LS145 |
|
|
Vcc | | |BU9831| | | | +-^--^--^--^------+
|
|
--- | | +------+ | | | A B C D +------+
|
|
| | | | | | | | | | | |
|
|
1-3 4 5 6 7 8 9 10 11 12 13-15 |
|
|
+--------------------------------------------------+ |
|
|
| connector | ---
|
|
+--------------------------------------------------+ GND
|
|
to controller
|
|
|
|
|
|
Signals charts:
|
|
While pressing space bar, watched HHKB original controller signals by logic analyzer.
|
|
Row and column is looping between 0-7 each for selecting a key.
|
|
A key is scaned every about 15ms, so scan rate is 66Hz.
|
|
(HHKB_chart1.jpg)
|
|
|
|
Space bar locate at ROW:3 COL:7. Key are selected by HC4051(C,B,A) and LS145(C,B,A).
|
|
Key state can be read on TP1684(4/KEY) while asserting low on LS145(D).
|
|
Usage of TP1684(5) is unknown. Key state can be read without using this signal.
|
|
(HHKB_chart2.jpg)
|
|
|
|
|
|
Matrix scan pseudo code:
|
|
for (row: 0-7) {
|
|
SELECT_ROW(row); // set HC4051(A,B,C)
|
|
|
|
for (col: 0-7) {
|
|
SELECT_COL(col); // set LS145(A,B,C)
|
|
|
|
_delay_us(50);
|
|
|
|
ENALBLE_COL(); // set LS145(D) to low
|
|
|
|
_delay_us(10);
|
|
|
|
if (KEY == 0) { // read TP1684(KEY)
|
|
// key pressed
|
|
} else {
|
|
// not pressed
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
Keymap layers
|
|
-------------
|
|
Followings are added layers with additional Fn keys. They are not final decision.
|
|
|
|
Layer0(Default Layer):
|
|
,-----------------------------------------------------------.
|
|
|Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =| \| `|
|
|
|-----------------------------------------------------------|
|
|
|Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]|Backs|
|
|
|-----------------------------------------------------------|
|
|
|Contro| A| S| D| F| G| H| J| K| L| ;| '|Return |
|
|
|-----------------------------------------------------------|
|
|
|Shift | Z| X| C| V| B| N| M| ,| .| /|Fn2 |Fn1|
|
|
`-----------------------------------------------------------'
|
|
|Gui|Alt |Space |Fn3 |Gui|
|
|
`-------------------------------------------'
|
|
|
|
Layer1(Fn1) HHKB mode:
|
|
,-----------------------------------------------------------.
|
|
|Pow| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Ins|Del|
|
|
|-----------------------------------------------------------|
|
|
|Caps | | | | | | | |Psc|Slk|Pus|Up | |Backs|
|
|
|-----------------------------------------------------------|
|
|
|Contro|VoD|VoU|Mut| | | *| /|Hom|PgU|Lef|Rig|Enter |
|
|
|-----------------------------------------------------------|
|
|
|Shift | | | | | | +| -|End|PgD|Dow|Shift |xxx|
|
|
`-----------------------------------------------------------'
|
|
|Gui |Alt |Space |Alt |Gui|
|
|
`--------------------------------------------'
|
|
|
|
Layer2(Fn2) mouse mode:
|
|
,-----------------------------------------------------------.
|
|
|Esc| | | | | | | | | | | | | | |
|
|
|-----------------------------------------------------------|
|
|
|Tab | | | | | | | | | | | | |Backs|
|
|
|-----------------------------------------------------------|
|
|
|Contro| | | | | | | |MwL|MwD|MwU|MwR|Return |
|
|
|-----------------------------------------------------------|
|
|
|Shift | | | | | | |McL|McD|McU|McR|xxxxxx| |
|
|
`-----------------------------------------------------------'
|
|
|Gui |Alt |Mb1 |Mb1 |Mb2|
|
|
`--------------------------------------------'
|
|
|
|
Layer3(Fn3) vi mode:
|
|
,-----------------------------------------------------------.
|
|
|Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12| | |
|
|
|-----------------------------------------------------------|
|
|
|Tab | | | | | |Hom|PgD|PgUlEnd| |MwD|MwU|Backs|
|
|
|-----------------------------------------------------------|
|
|
|Contro| | | | | |Lef|Dow|Up |Rig| | |Return |
|
|
|-----------------------------------------------------------|
|
|
|Shift | | | | | | |McL|McD|McU|McR|Mb1 | |
|
|
`-----------------------------------------------------------'
|
|
|Gui|Alt |Mb1 |xxxxx|Mb2|
|
|
`-------------------------------------------'
|
|
Mc: Mouse Cursor / Mb: Mouse Button / Mw: Mouse Wheel
|
|
|
|
EOF
|