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1 | /* | |
2 | Copyright 2017 Jun Wako <wakojun@gmail.com> | |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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/>. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * scan matrix | |
20 | */ | |
21 | #include <stdint.h> | |
22 | #include <stdbool.h> | |
23 | #include <util/delay.h> | |
24 | #include "print.h" | |
25 | #include "debug.h" | |
26 | #include "util.h" | |
27 | #include "timer.h" | |
28 | #include "matrix.h" | |
29 | #include <avr/wdt.h> | |
30 | #include "suspend.h" | |
31 | #include "lufa.h" | |
32 | #include "led.h" | |
33 | #include "fc660c.h" | |
34 | ||
35 | ||
36 | static uint32_t matrix_last_modified = 0; | |
37 | ||
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]; | |
43 | ||
44 | ||
45 | void matrix_init(void) | |
46 | { | |
47 | #if 0 | |
48 | debug_enable = true; | |
49 | debug_keyboard = true; | |
50 | debug_matrix = true; | |
51 | #endif | |
52 | ||
53 | KEY_INIT(); | |
54 | ||
55 | // LEDs on CapsLock and Insert | |
56 | DDRB |= (1<<5) | (1<<6); | |
57 | PORTB |= (1<<5) | (1<<6); | |
58 | ||
59 | // initialize matrix state: all keys off | |
60 | for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00; | |
61 | for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00; | |
62 | matrix = _matrix0; | |
63 | matrix_prev = _matrix1; | |
64 | } | |
65 | ||
66 | uint8_t matrix_scan(void) | |
67 | { | |
68 | matrix_row_t *tmp; | |
69 | ||
70 | tmp = matrix_prev; | |
71 | matrix_prev = matrix; | |
72 | matrix = tmp; | |
73 | ||
74 | uint8_t row, col; | |
75 | for (col = 0; col < MATRIX_COLS; col++) { | |
76 | SET_COL(col); | |
77 | for (row = 0; row < MATRIX_ROWS; row++) { | |
78 | //KEY_SELECT(row, col); | |
79 | SET_ROW(row); | |
80 | _delay_us(2); | |
81 | ||
82 | // Not sure this is needed. This just emulates HHKB controller's behaviour. | |
83 | if (matrix_prev[row] & (1<<col)) { | |
84 | KEY_HYS_ON(); | |
85 | } | |
86 | _delay_us(10); | |
87 | ||
88 | // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE. | |
89 | // If V-USB interrupts in this section we could lose 40us or so | |
90 | // and would read invalid value from KEY_STATE. | |
91 | uint8_t last = TIMER_RAW; | |
92 | ||
93 | KEY_ENABLE(); | |
94 | ||
95 | // Wait for KEY_STATE outputs its value. | |
96 | _delay_us(2); | |
97 | ||
98 | if (KEY_STATE()) { | |
99 | matrix[row] &= ~(1<<col); | |
100 | } else { | |
101 | matrix[row] |= (1<<col); | |
102 | } | |
103 | ||
104 | // Ignore if this code region execution time elapses more than 20us. | |
105 | // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us] | |
106 | // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b) | |
107 | if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) { | |
108 | matrix[row] = matrix_prev[row]; | |
109 | } | |
110 | ||
111 | _delay_us(5); | |
112 | KEY_HYS_OFF(); | |
113 | KEY_UNABLE(); | |
114 | ||
115 | // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE. | |
116 | // This takes 25us or more to make sure KEY_STATE returns to idle state. | |
117 | _delay_us(75); | |
118 | } | |
119 | if (matrix[row] ^ matrix_prev[row]) { | |
120 | matrix_last_modified = timer_read32(); | |
121 | } | |
122 | } | |
123 | return 1; | |
124 | } | |
125 | ||
126 | inline | |
127 | matrix_row_t matrix_get_row(uint8_t row) | |
128 | { | |
129 | return matrix[row]; | |
130 | } | |
131 | ||
132 | void led_set(uint8_t usb_led) | |
133 | { | |
134 | if (usb_led & (1<<USB_LED_CAPS_LOCK)) { | |
135 | PORTB &= ~(1<<6); | |
136 | } else { | |
137 | PORTB |= (1<<6); | |
138 | } | |
139 | } |