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- /*
- * scan matrix
- */
- #include <avr/io.h>
- #include <util/delay.h>
- #include "keymap.h"
- #include "matrix.h"
- #include "print.h"
-
- // matrix is active low. (key on: 0/key off: 1)
- //
- // HHKB has no ghost and no bounce.
- // row: HC4051 select input channel(0-8)
- // PB0, PB1, PB2(A, B, C)
- // col: LS145 select low output line(0-8)
- // 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)
- #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)
-
- // matrix state buffer
- uint8_t *matrix;
- uint8_t *matrix_prev;
- static uint8_t _matrix0[MATRIX_ROWS];
- static uint8_t _matrix1[MATRIX_ROWS];
-
-
- // this must be called once before matrix_scan.
- void matrix_init(void)
- {
- // row & col output(PB0-6)
- DDRB = 0xFF;
- PORTB = KEY_SELELCT(0, 0);
- // KEY & VALID input w/o pullup(PE6,7)
- DDRE = 0x3F;
- PORTE = 0x00;
-
- // initialize matrix state: all keys off
- for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0xFF;
- for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0xFF;
- matrix = _matrix0;
- matrix_prev = _matrix1;
- }
-
- uint8_t matrix_scan(void)
- {
- uint8_t state;
- uint8_t *tmp;
-
- tmp = matrix_prev;
- matrix_prev = matrix;
- matrix = tmp;
-
- for (int row = 0; row < MATRIX_ROWS; row++) {
- for (int col = 0; col < MATRIX_COLS; col++) {
- //print("scan: "); phex(row); phex(col); print("\n");
- KEY_SELELCT(row, col);
- _delay_us(50); // from logic analyzer chart
- KEY_ENABLE;
- _delay_us(10); // from logic analyzer chart
- //print("PINE: "); phex(PINE); print("\n");
- if (KEY_ON) {
- matrix[row] &= ~(1<<col);
- } else {
- matrix[row] |= (1<<col);
- }
- KEY_UNABLE;
- _delay_us(150); // from logic analyzer chart
- }
- }
- return 1;
- }
-
- bool matrix_is_modified(void) {
- for (int i=0; i <MATRIX_ROWS; i++) {
- if (matrix[i] != matrix_prev[i])
- return true;
- }
- return false;
- }
-
- bool matrix_has_ghost(void) {
- return false;
- }
-
- bool matrix_has_ghost_in_row(uint8_t row) {
- return false;
- }
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