tmk
9 years ago
1 changed files with 20 additions and 59 deletions
+ 20
- 59
keyboard/hhkb/doc/HHKB.txt
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| @@ -162,7 +162,7 @@ Matrix diagram: | |||
| Signals charts | |||
| -------------- | |||
| While pressing space bar, watched HHKB original controller signals by logic analyzer. | |||
| While pressing space bar, watched HHKB Pro 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. | |||
| @@ -171,71 +171,32 @@ Signals charts | |||
| Space bar locate at ROW:3 COL:7. A key is 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 not clear. Controller seemed to output previous key state on this line. | |||
| However key state can be read without using this signal. | |||
| (HHKB_chart2.jpg) | |||
| 5us after setting colA-C | |||
| colA _~~~~~~~~~~~~~~~~~~ | |||
| prev _~~~~_____ 20us if previous key state is low | |||
| colD ~~~__~~~~~ 10us column enabled | |||
| key ~~~____~~~ 22us hold state of the key | |||
| prev ____~~~~__________ 20us(JP)/17us(Pro2) | |||
| key ~~~~~~_____~~~~~~~ 22us | |||
| colD ~~~~~~__~~~~~~~~~~ 10us(LS175) | |||
| colC ____~~~~____~~~~ 550/410us(JP) | |||
| colB __~~__~~__~~__~~ 200/210us(JP) | |||
| colA _~_~_~_~_~_~_~_~ 100/110us(JP) 200/210us(Pro2) | |||
| 0123456701234567 selected column | |||
| rowC ____~~~~____~~~~ 3.8/3.8ms(JP) S2 of HC4051 | |||
| rowB __~~__~~__~~__~~ 1.9/1.9ms(JP) S1 of HC4051 | |||
| rowA _~_~_~_~_~_~_~_~ 1.0/1.0ms(JP) S0 of HC4051 | |||
| 0123456701234567 selected row(Pro/Pro2) | |||
| 0123456789ABCDEF selected row(JP) | |||
| rowEn0 ________~~~~~~~~ 7.7/7.7ms ~Enable of Z2 HC4051(JP only) | |||
| rowEn1 ~~~~~~~~________ 7.7/7.7ms ~Enable of Z3 HC4051(JP only) | |||
| NOTE: JP scans twice fast as Pro2 does. So Pro2 scan 8x8 matrix in 15.4ms while JP can 16x8 in that time. | |||
| 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(40); | |||
| if (prev_key_state(row, col)) { | |||
| KEY_PREV_ON; | |||
| } | |||
| _delay_us(7); | |||
| ENALBLE_COL(); // set LS145(D) to low | |||
| Signal of JP: | |||
| _delay_us(10); | |||
| 1) Select row | |||
| rowC ____~~~~____~~~~ 3.8/3.8ms(JP) 7.7/7.7ms(Pro) S2 of HC4051 | |||
| rowB __~~__~~__~~__~~ 1.9/1.9ms(JP) 3.8/3.8ms(Pro) S1 of HC4051 | |||
| rowA _~_~_~_~_~_~_~_~ 1.0/1.0ms(JP) 1.9/1.9ms(Pro) S0 of HC4051 | |||
| 0123456701234567 selected row(Pro) | |||
| 0123456789ABCDEF selected row(JP) | |||
| rowEn0 ________~~~~~~~~ 7.7/7.7ms(JP only) ~Enable of Z2 HC4051(JP only) | |||
| rowEn1 ~~~~~~~~________ 7.7/7.7ms(JP only) ~Enable of Z3 HC4051(JP only) | |||
| if (KEY == 0) { // read TP1684(KEY) | |||
| // key pressed | |||
| } else { | |||
| // not pressed | |||
| } | |||
| 2) Select column | |||
| colC ____~~~~____~~~~ 550/410us(JP) / us(Pro) | |||
| colB __~~__~~__~~__~~ 200/210us(JP) 450/460us(Pro) | |||
| colA _~_~_~_~_~_~_~_~ 100/110us(JP) 220/230us(Pro) | |||
| 0123456701234567 selected column | |||
| KEY_PREV_OFF; | |||
| UNALBLE_COL(); // set LS145(D) to high | |||
| 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 | |||
| colD ~~~__~~~~~ 10us strobe | |||
| key ~~~____~~~ 22us indicates current state of the key | |||
| _delay_us(150); | |||
| } | |||
| } | |||
| NOTE: JP scans twice fast as Pro/Pro2 does. So Pro/Pro2 scans 8x8 matrix in 15.4ms while JP scans 16x8 in that time. | |||