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@@ -162,7 +162,7 @@ Matrix diagram: |
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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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While pressing space bar, watched HHKB Pro 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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@@ -171,71 +171,32 @@ Signals charts |
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Space bar locate at ROW:3 COL:7. A key is selected by HC4051(C,B,A) and LS145(C,B,A). |
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Key state can be read on TP1684(4/KEY) while asserting low on LS145(D). |
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Usage of TP1684(5) is not clear. Controller seemed to output previous key state on this line. |
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However key state can be read without using this signal. |
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(HHKB_chart2.jpg) |
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5us after setting colA-C |
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colA _~~~~~~~~~~~~~~~~~~ |
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prev _~~~~_____ 20us if previous key state is low |
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colD ~~~__~~~~~ 10us column enabled |
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key ~~~____~~~ 22us hold state of the key |
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prev ____~~~~__________ 20us(JP)/17us(Pro2) |
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key ~~~~~~_____~~~~~~~ 22us |
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colD ~~~~~~__~~~~~~~~~~ 10us(LS175) |
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colC ____~~~~____~~~~ 550/410us(JP) |
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colB __~~__~~__~~__~~ 200/210us(JP) |
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colA _~_~_~_~_~_~_~_~ 100/110us(JP) 200/210us(Pro2) |
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0123456701234567 selected column |
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rowC ____~~~~____~~~~ 3.8/3.8ms(JP) S2 of HC4051 |
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rowB __~~__~~__~~__~~ 1.9/1.9ms(JP) S1 of HC4051 |
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rowA _~_~_~_~_~_~_~_~ 1.0/1.0ms(JP) S0 of HC4051 |
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0123456701234567 selected row(Pro/Pro2) |
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0123456789ABCDEF selected row(JP) |
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rowEn0 ________~~~~~~~~ 7.7/7.7ms ~Enable of Z2 HC4051(JP only) |
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rowEn1 ~~~~~~~~________ 7.7/7.7ms ~Enable of Z3 HC4051(JP only) |
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NOTE: JP scans twice fast as Pro2 does. So Pro2 scan 8x8 matrix in 15.4ms while JP can 16x8 in that time. |
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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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for (col: 0-7) { |
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SELECT_COL(col); // set LS145(A,B,C) |
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_delay_us(40); |
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if (prev_key_state(row, col)) { |
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KEY_PREV_ON; |
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} |
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_delay_us(7); |
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ENALBLE_COL(); // set LS145(D) to low |
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Signal of JP: |
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_delay_us(10); |
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1) Select row |
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rowC ____~~~~____~~~~ 3.8/3.8ms(JP) 7.7/7.7ms(Pro) S2 of HC4051 |
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rowB __~~__~~__~~__~~ 1.9/1.9ms(JP) 3.8/3.8ms(Pro) S1 of HC4051 |
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rowA _~_~_~_~_~_~_~_~ 1.0/1.0ms(JP) 1.9/1.9ms(Pro) S0 of HC4051 |
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0123456701234567 selected row(Pro) |
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0123456789ABCDEF selected row(JP) |
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rowEn0 ________~~~~~~~~ 7.7/7.7ms(JP only) ~Enable of Z2 HC4051(JP only) |
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rowEn1 ~~~~~~~~________ 7.7/7.7ms(JP only) ~Enable of Z3 HC4051(JP only) |
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if (KEY == 0) { // read TP1684(KEY) |
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// key pressed |
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} else { |
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// not pressed |
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} |
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2) Select column |
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colC ____~~~~____~~~~ 550/410us(JP) / us(Pro) |
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colB __~~__~~__~~__~~ 200/210us(JP) 450/460us(Pro) |
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colA _~_~_~_~_~_~_~_~ 100/110us(JP) 220/230us(Pro) |
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0123456701234567 selected column |
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KEY_PREV_OFF; |
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UNALBLE_COL(); // set LS145(D) to high |
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3) Wait 5us after column select, then set prev, strobe colD to spit out key status and read it. |
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prev _~~~~_____ 20us if previous key state is low |
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colD ~~~__~~~~~ 10us strobe |
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key ~~~____~~~ 22us indicates current state of the key |
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_delay_us(150); |
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} |
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} |
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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. |
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