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@@ -1,67 +1,16 @@
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-Alternative Controller for HHKB pro
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-===================================
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-I want to add vi cursor and mouse keys to HHKB. Original HHKB controller is not programmable and
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-firmware source code is not open. So, customizing HHKB needs to replace original controller with programmable one.
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-I used Teensy++ as alternative controller. Though a Teensy has enough ports to drive HHKB,
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-Teensy++ has clean pinout and it makes programing and wiring easier.
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+Internal of HHKB pro
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+=====================
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+HHKB pro has MCU and some chips on separate two PCBs.
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-This is just a proof of concept for replacing controller of HHKB, not a complete firmware.
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-
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-My prototype firmware source tree is here:
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- github(http://github.com/tmk/tmk_keyboard)
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-This firmware is a port of my previous project:
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- HHKB style Mod(http://geekhack.org/showwiki.php?title=Island:11930)
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-PJRC:
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- Teensy++/Teensy(http://www.pjrc.com/teensy/)
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-
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-
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-Pros:
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- * without pattern cutting, case mod and soldering
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- * can keep original controller intact
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- * can change HHKB behaviour as you like(by C programming)
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-
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-Cons:
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- * void your warranty
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- * unavailability of Teensy++/Teensy(because of PS3 cracking boom?)
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-
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-Features:
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- * customized keymap
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- * more keymap layers
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- * mouse keys for minimum mouse operation(never comfortable for normal use)
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- * and more...(in the future)
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-
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-Any suggestions or ideas are welcome.
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-
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-
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-NOTE:
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- My HHKB is just "Professional". This means followings may not be applied to "Professional2".
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-
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-DISCLAIMER:
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- I'm not a professional for electronics and 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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-
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-
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-Teensy++ installation
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----------------------
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-Angled USB mini B adapter is used to install Teensy++ laterally.
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-(teensy_install.jpg)
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-
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-Bread baord wires are used to connect Teensy++.
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-(teensy_wiring.jpg)
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-(connector_contact.jpg)
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-
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-
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-HHKB internal
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--------------
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-HHKB pro has some chips on separate two PCBs.
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-
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-Controller PCB:
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+Controller PCB
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+--------------
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M38K07M4 Renesas MCU with USB function
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http://documentation.renesas.com/eng/products/mpumcu/rej03b0192_38k0ds.pdf
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(HHKB_controller.jpg)
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-Keyswitch PCB:
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+Keyswitch PCB
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+-------------
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HC4051 Analog Multiplexer: select a row line.
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http://www.alldatasheet.com/datasheet-pdf/pdf/203989/KODENSHI/KK74HC4051A.html
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LS145 BCD Decoder: select a column line.
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@@ -76,13 +25,16 @@ Keyswitch PCB:
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(HHKB_TP1684.jpg)
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-Two PCBs are connected by 15 lines. Vcc and GND use 3 lines each, other 9 lines are for keyboard signaling.
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+Connector Cable
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+---------------
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+Two PCBs are connected by 15 lines(13 in case of Pro2).
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+Vcc and GND use 3(2) lines each, other 9 lines are for keyboard signaling.
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Keyswitch PCB connector Teensy++ pins
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-------------------------------------------------------------------------------
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- 1 Vcc(5V) 5V
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- 2 Vcc(5V)
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- 3 Vcc(5V)
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+ 1 Vcc(5V) Not exist on Pro2 5V
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+ 2 Vcc(5V) 5V
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+ 3 Vcc(5V) 5V
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4 TP1684 KEY: Low(0) when key pressed PE6 input(with pullup)
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5 TP1684 KEY_PREV: assert previous key state??? PE7 output
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6 HC4051 A(bit0) select 8 rows(0 to 7) PB0 output
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@@ -92,9 +44,11 @@ Two PCBs are connected by 15 lines. Vcc and GND use 3 lines each, other 9 lines
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10 LS145 B(bit1) PB4 output
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11 LS145 C(bit2) PB5 output
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12 LS145 D(enable) Low(0) enable selected column PB6 output
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- 13 GND
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- 14 GND
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- 15 GND GND
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+ 13 GND GND
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+ 14 GND GND
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+ 15 GND Not exist on Pro2 GND
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+
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+ NOTE: guessing pin5(KEY_PREV) may work for hysteresis of capacitive sensing.
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(HHKB_connector.jpg)
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@@ -103,19 +57,20 @@ Keyswitch matrix
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----------------
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60 keyswitches in 8*8 matrix. It is ghost-free and bounce-free.
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- COL 0 1 2 3 4 5 6 7
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-ROW ---------------------------------------------------------------
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- 0| 2 q w s a z x c
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- 1| 3 4 r e d f v b
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- 2| 5 6 y t g h n _NONE_
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- 3| 1 Esc Tab Control LShift LAlt LMeta Space
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- 4| 7 8 u i k j m _NONE_
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- 5| \ ` Delete Return Fn RShift RAlt RMeta
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- 6| 9 0 o p ; l , _NONE_
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- 7| - + ] [ ' / . _NONE_
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+ COL 0 1 2 3 4 5 6 7
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+ ROW ---------------------------------------------------------------
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+ 0| 2 q w s a z x c
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+ 1| 3 4 r e d f v b
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+ 2| 5 6 y t g h n _NONE_
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+ 3| 1 Esc Tab Control LShift LAlt LMeta Space
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+ 4| 7 8 u i k j m _NONE_
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+ 5| \ ` Delete Return Fn RShift RAlt RMeta
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+ 6| 9 0 o p ; l , _NONE_
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+ 7| - + ] [ ' / . _NONE_
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Matrix diagram:
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+
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+-------------------------+-+-+-+-+-+-+-+ Vcc
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|bias control? - - - - - - - - ---
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| 3.9K*8 R R R R R R R R |
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@@ -141,7 +96,8 @@ Matrix diagram:
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to controller
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-Signals charts:
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+Signals charts
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+--------------
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While pressing space bar, watched HHKB original controller signals by logic analyzer.
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Row and column is looping between 0-7 each for selecting a key.
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A key is scaned every about 15ms, so scan rate is 66Hz.
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@@ -157,7 +113,8 @@ Signals charts:
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(HHKB_chart2.jpg)
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-Matrix scan pseudo code:
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+Matrix scan pseudo code
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+-----------------------
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for (row: 0-7) {
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SELECT_ROW(row); // set HC4051(A,B,C)
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@@ -190,10 +147,5 @@ Matrix scan pseudo code:
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}
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-Keymap layers
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--------------
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-Followings are added layers with additional Fn keys.
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-
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-see keymap.c
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EOF
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tmk