tmk
13 years ago
2 changed files with 31 additions and 14 deletions
+ 13
- 4
hhkb/doc/HHKB.txt
View File
| @@ -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); | |||
+ 18
- 10
hhkb/matrix.c
View File
| @@ -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 | |||
| } | |||
Loading…