diff options
Diffstat (limited to 'hhkb')
| -rw-r--r-- | hhkb/doc/HHKB.txt | 17 | ||||
| -rw-r--r-- | hhkb/matrix.c | 28 |
2 files changed, 31 insertions, 14 deletions
diff --git a/hhkb/doc/HHKB.txt b/hhkb/doc/HHKB.txt index 3ca272c80..e9f41adab 100644 --- a/hhkb/doc/HHKB.txt +++ b/hhkb/doc/HHKB.txt @@ -84,7 +84,7 @@ Two PCBs are connected by 15 lines. Vcc and GND use 3 lines each, other 9 lines 2 Vcc(5V) 3 Vcc(5V) 4 TP1684 KEY: Low(0) when key pressed PE6 input(with pullup) - 5 TP1684 unknown:how to use PE7 input(with pullup) + 5 TP1684 KEY_PREV: assert previous key state??? PE7 output 6 HC4051 A(bit0) select 8 rows(0 to 7) PB0 output 7 HC4051 B(bit1) PB1 output 8 HC4051 C(bit2) PB2 output @@ -148,9 +148,11 @@ Signals charts: (HHKB_chart1.jpg) - Space bar locate at ROW:3 COL:7. Key are selected by HC4051(C,B,A) and LS145(C,B,A). + 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 unknown. Key state can be read without using this signal. + + 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) @@ -162,7 +164,13 @@ Matrix scan pseudo code: for (col: 0-7) { SELECT_COL(col); // set LS145(A,B,C) - _delay_us(50); + _delay_us(40); + + if (prev_key_state(row, col)) { + KEY_PREV_ON; + } + + _delay_us(7); ENALBLE_COL(); // set LS145(D) to low @@ -174,6 +182,7 @@ Matrix scan pseudo code: // not pressed } + KEY_PREV_OFF; UNALBLE_COL(); // set LS145(D) to high _delay_us(150); diff --git a/hhkb/matrix.c b/hhkb/matrix.c index cf5e8a0ef..a6e0bf633 100644 --- a/hhkb/matrix.c +++ b/hhkb/matrix.c @@ -19,13 +19,15 @@ // PB3, PB4, PB5, PB6(A, B, C, D) // use D as ENABLE: (enable: 0/unenable: 1) // key: KEY: (on: 0/ off:1) -// UNKNOWN: unknown whether input or output -// PE6,PE7(KEY, UNKNOWN) +// KEY_PREV: (on: 1/ off: 0) +// PE6,PE7(KEY, KEY_PREV) #define COL_ENABLE (1<<6) #define KEY_SELELCT(ROW, COL) (PORTB = COL_ENABLE|(((COL)&0x07)<<3)|((ROW)&0x07)) #define KEY_ENABLE (PORTB &= ~COL_ENABLE) #define KEY_UNABLE (PORTB |= COL_ENABLE) -#define KEY_ON ((PINE&(1<<6)) ? false : true) +#define KEY_STATE (PINE&(1<<6)) +#define KEY_PREV_ON (PORTE |= (1<<7)) +#define KEY_PREV_OFF (PORTE &= ~(1<<7)) // matrix state buffer static uint8_t *matrix; @@ -52,9 +54,10 @@ void matrix_init(void) // row & col output(PB0-6) DDRB = 0xFF; PORTB = KEY_SELELCT(0, 0); - // KEY & VALID input with pullup(PE6,7) - DDRE = 0x3F; - PORTE = 0xC0; + // KEY: input with pullup(PE6) + // KEY_PREV: output(PE7) + DDRE = 0xBF; + PORTE = 0x40; // initialize matrix state: all keys off for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00; @@ -74,14 +77,19 @@ int matrix_scan(void) for (int row = 0; row < MATRIX_ROWS; row++) { for (int col = 0; col < MATRIX_COLS; col++) { KEY_SELELCT(row, col); - _delay_us(50); // from logic analyzer chart + _delay_us(40); // from logic analyzer chart + if (matrix_prev[row] & (1<<col)) { + KEY_PREV_ON; + } + _delay_us(7); // from logic analyzer chart KEY_ENABLE; _delay_us(10); // from logic analyzer chart - if (KEY_ON) { - matrix[row] |= (1<<col); - } else { + if (KEY_STATE) { matrix[row] &= ~(1<<col); + } else { + matrix[row] |= (1<<col); } + KEY_PREV_OFF; KEY_UNABLE; _delay_us(150); // from logic analyzer chart } |