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- /*
- * scan matrix
- */
- #include <stdint.h>
- #include <stdbool.h>
- #include <avr/io.h>
- #include <util/delay.h>
- #include "print.h"
- #include "util.h"
- #include "matrix_skel.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)
- // KEY_PREV: (on: 1/ off: 0)
- // PE6,PE7(KEY, KEY_PREV)
- #define COL_ENABLE (1<<6)
- #define KEY_SELELCT(ROW, COL) (PORTB = (PORTB&(1<<7))|COL_ENABLE|(((COL)&0x07)<<3)|((ROW)&0x07))
- #define KEY_ENABLE (PORTB &= ~COL_ENABLE)
- #define KEY_UNABLE (PORTB |= COL_ENABLE)
- #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;
- static uint8_t *matrix_prev;
- static uint8_t _matrix0[MATRIX_ROWS];
- static uint8_t _matrix1[MATRIX_ROWS];
-
-
- inline
- int matrix_rows(void)
- {
- return MATRIX_ROWS;
- }
-
- inline
- int matrix_cols(void)
- {
- return MATRIX_COLS;
- }
-
- // this must be called once before matrix_scan.
- void matrix_init(void)
- {
- // row & col output(PB0-6)
- DDRB = 0xFF;
- KEY_SELELCT(0, 0);
- // 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;
- for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
- matrix = _matrix0;
- matrix_prev = _matrix1;
- }
-
- int matrix_scan(void)
- {
- 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++) {
- KEY_SELELCT(row, col);
- _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_STATE) {
- matrix[row] &= ~(1<<col);
- } else {
- matrix[row] |= (1<<col);
- }
- KEY_PREV_OFF;
- 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;
- }
-
- inline
- bool matrix_has_ghost(void)
- {
- return false;
- }
-
- inline
- bool matrix_is_on(int row, int col)
- {
- return (matrix[row] & (1<<col));
- }
-
- inline
- uint16_t matrix_get_row(int row)
- {
- return matrix[row];
- }
-
- void matrix_print(void)
- {
- print("\nr/c 01234567\n");
- for (int row = 0; row < matrix_rows(); row++) {
- phex(row); print(": ");
- pbin_reverse(matrix_get_row(row));
- print("\n");
- }
- }
-
- int matrix_key_count(void)
- {
- int count = 0;
- for (int i = 0; i < MATRIX_ROWS; i++) {
- count += bitpop(matrix[i]);
- }
- return count;
- }
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