2 Copyright 2017 Jun Wako <wakojun@gmail.com>
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include <util/delay.h>
36 static uint32_t matrix_last_modified = 0;
38 // matrix state buffer(1:on, 0:off)
39 static matrix_row_t *matrix;
40 static matrix_row_t *matrix_prev;
41 static matrix_row_t _matrix0[MATRIX_ROWS];
42 static matrix_row_t _matrix1[MATRIX_ROWS];
45 void matrix_init(void)
49 debug_keyboard = true;
55 // initialize matrix state: all keys off
56 for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
57 for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
59 matrix_prev = _matrix1;
62 uint8_t matrix_scan(void)
71 for (col = 0; col < MATRIX_COLS; col++) {
73 for (row = 0; row < MATRIX_ROWS; row++) {
74 //KEY_SELECT(row, col);
78 // Not sure this is needed. This just emulates HHKB controller's behaviour.
79 if (matrix_prev[row] & (1<<col)) {
84 // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
85 // If V-USB interrupts in this section we could lose 40us or so
86 // and would read invalid value from KEY_STATE.
87 uint8_t last = TIMER_RAW;
91 // Wait for KEY_STATE outputs its value.
95 matrix[row] &= ~(1<<col);
97 matrix[row] |= (1<<col);
100 // Ignore if this code region execution time elapses more than 20us.
101 // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us]
102 // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b)
103 if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
104 matrix[row] = matrix_prev[row];
111 // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
112 // This takes 25us or more to make sure KEY_STATE returns to idle state.
115 if (matrix[row] ^ matrix_prev[row]) {
116 matrix_last_modified = timer_read32();
123 matrix_row_t matrix_get_row(uint8_t row)
128 void led_set(uint8_t usb_led)
130 if (usb_led & (1<<USB_LED_CAPS_LOCK)) {