diff options
| -rw-r--r-- | keyboard/hhkb/doc/HHKB.txt | 79 |
1 files changed, 20 insertions, 59 deletions
diff --git a/keyboard/hhkb/doc/HHKB.txt b/keyboard/hhkb/doc/HHKB.txt index 74b680d032..98397b8477 100644 --- a/keyboard/hhkb/doc/HHKB.txt +++ b/keyboard/hhkb/doc/HHKB.txt @@ -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. |