tmk
9 years ago
1 changed files with 11 additions and 10 deletions
+ 11
- 10
keyboard/hhkb/doc/HHKB.txt
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| @@ -31,27 +31,28 @@ Two PCBs are connected by 15 lines(13 in case of Pro2). | |||
| Vcc and GND use 3(2) lines each, other lines are for keyboard signaling. | |||
| HHKB connector lines: | |||
| JP Pro2 Pro Function Description Teensy++ pins | |||
| JP Pro2 Pro Function Description TMK pin usage | |||
| -------------------------------------------------------------------------------------------- | |||
| 1 Vcc(5V) 5V | |||
| 1 1 2 Vcc(5V) 5V | |||
| 2 2 3 Vcc(5V) 5V | |||
| 3 3 4 TP1684 KEY: Low(0) when key pressed PE6 input(with pullup) | |||
| 4 4 5 TP1684 KEY_PREV: make threshold PE7 output | |||
| 3 3 4 TP1684 ~KEY: Low(0) when key is pressed PD7 input(with pullup) | |||
| 4 4 5 TP1684 HYS: High(1) when key is pressed PB7 output | |||
| 5 5 6 HC4051 A(bit0)\ PB0 output | |||
| 6 6 7 HC4051 B(bit1) > select row 0-7 PB1 output | |||
| 7 7 8 HC4051 C(bit2)/ PB2 output | |||
| 8 8 9 LS145 A(bit0)\ PB3 output | |||
| 9 9 10 LS145 B(bit1) > select column 0-7 PB4 output | |||
| 10 10 11 LS145 C(bit2)/ PB5 output | |||
| 11 11 12 LS145 D(enable) Low(0) enables selected column PB6 output | |||
| 11 11 12 LS145 ~D(enable) Low(0) enables selected column PB6 output | |||
| 12 12 13 GND GND | |||
| 13 13 14 GND GND | |||
| 15 GND | |||
| 14 HC4051(Z2) ~Enable of Z2 row0-7 | |||
| 15 HC4051(Z3) ~Enable of Z3 row8-15 | |||
| 14 HC4051(Z2) ~Enable of Z2 row0-7 PC6 | |||
| 15 HC4051(Z3) ~Enable of Z3 row8-15 PC7 | |||
| NOTE: guessing pin5(KEY_PREV) may work for hysteresis of capacitive sensing. | |||
| NOTE: Probably HYS changes threshold for upstroke and makes hysteresis in the result. | |||
| NOTE: HYS should be given High(1) when previous KEY state is Low(0). | |||
| NOTE: 1KOhm didn't work as pullup resistor on KEY. AVR internal pullup or 10KOhm resistor was OK. | |||
| NOTE: JP has two HC4051(Z2,Z3) and line 5, 6 and 7 are connected to both of them. | |||
| @@ -112,7 +113,7 @@ Matrix diagram: | |||
| | <-+ | <6-------|-|-|-|-|-|-|-|--|R|-+ | |||
| | 1 4 | | | <7-------|-|-|-|-|-|-|-|--|R|-+ | |||
| +---V---^-+ | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8 | |||
| KEY PREV | A B C +-----------------+ | |||
| KEY HYS | A B C +-----------------+ | |||
| | | +-^----+ | | | | LS145 | | |||
| Vcc | | |BU9831| | | | +-^--^--^--^------+ | |||
| --- | | +------+ | | | A B C D +-------+ | |||
| @@ -138,7 +139,7 @@ Matrix diagram: | |||
| | | +----> <6-----------|-|-|-|-|----|R|-+ | |||
| | | | | | A B C <7-----------|-|-|-|-|----|R|-+ | |||
| +---V---^-+ | | +-^-^-^--+ | | | | | | | |||
| KEY PREV | | | | | | | | | | | | |||
| KEY HYS | | | | | | | | | | | | |||
| | | | | +--------+ | | | | | | | |||
| | | | | | HC4051 <8-----------|-|-|-|-|----|R|-+ | |||
| | | | | | Z3 <9-----------|-|-|-|-|----|R|-+ | |||
| @@ -192,7 +193,7 @@ Signals charts | |||
| 0123456701234567 selected column | |||
| 3) Wait 5us after column select, then set prev, strobe colD to spit out key status and read it. | |||
| prev _~~~~_____ 20us if previous key state is low | |||
| hys _~~~~_____ 20us if previous key state is low | |||
| colD ~~~__~~~~~ 10us strobe | |||
| key ~~~____~~~ 22us indicates current state of the key | |||
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