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1 | /* | |
2 | Copyright 2011 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 "hhkb_avr.h" | |
30 | #include <avr/wdt.h> | |
31 | #include "suspend.h" | |
32 | #include "lufa.h" | |
33 | ||
34 | ||
35 | // matrix power saving | |
36 | #define MATRIX_POWER_SAVE 10000 | |
37 | static uint32_t matrix_last_modified = 0; | |
38 | ||
39 | // matrix state buffer(1:on, 0:off) | |
40 | static matrix_row_t *matrix; | |
41 | static matrix_row_t *matrix_prev; | |
42 | static matrix_row_t _matrix0[MATRIX_ROWS]; | |
43 | static matrix_row_t _matrix1[MATRIX_ROWS]; | |
44 | ||
45 | ||
46 | void matrix_init(void) | |
47 | { | |
48 | #ifdef DEBUG | |
49 | debug_enable = true; | |
50 | debug_keyboard = true; | |
51 | #endif | |
52 | ||
53 | KEY_INIT(); | |
54 | ||
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; | |
58 | matrix = _matrix0; | |
59 | matrix_prev = _matrix1; | |
60 | } | |
61 | ||
62 | uint8_t matrix_scan(void) | |
63 | { | |
64 | uint8_t *tmp; | |
65 | ||
66 | tmp = matrix_prev; | |
67 | matrix_prev = matrix; | |
68 | matrix = tmp; | |
69 | ||
70 | // power on | |
71 | if (!KEY_POWER_STATE()) KEY_POWER_ON(); | |
72 | for (uint8_t row = 0; row < MATRIX_ROWS; row++) { | |
73 | for (uint8_t col = 0; col < MATRIX_COLS; col++) { | |
74 | KEY_SELECT(row, col); | |
75 | _delay_us(5); | |
76 | ||
77 | // Not sure this is needed. This just emulates HHKB controller's behaviour. | |
78 | if (matrix_prev[row] & (1<<col)) { | |
79 | KEY_PREV_ON(); | |
80 | } | |
81 | _delay_us(10); | |
82 | ||
83 | // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE. | |
84 | // If V-USB interrupts in this section we could lose 40us or so | |
85 | // and would read invalid value from KEY_STATE. | |
86 | uint8_t last = TIMER_RAW; | |
87 | ||
88 | KEY_ENABLE(); | |
89 | ||
90 | // Wait for KEY_STATE outputs its value. | |
91 | // 1us was ok on one HHKB, but not worked on another. | |
92 | // no wait doesn't work on Teensy++ with pro(1us works) | |
93 | // no wait does work on tmk PCB(8MHz) with pro2 | |
94 | // 1us wait does work on both of above | |
95 | // 1us wait doesn't work on tmk(16MHz) | |
96 | // 5us wait does work on tmk(16MHz) | |
97 | // 5us wait does work on tmk(16MHz/2) | |
98 | // 5us wait does work on tmk(8MHz) | |
99 | // 10us wait does work on Teensy++ with pro | |
100 | // 10us wait does work on 328p+iwrap with pro | |
101 | // 10us wait doesn't work on tmk PCB(8MHz) with pro2(very lagged scan) | |
102 | _delay_us(5); | |
103 | ||
104 | if (KEY_STATE()) { | |
105 | matrix[row] &= ~(1<<col); | |
106 | } else { | |
107 | matrix[row] |= (1<<col); | |
108 | } | |
109 | ||
110 | // Ignore if this code region execution time elapses more than 20us. | |
111 | // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us] | |
112 | // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b) | |
113 | if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) { | |
114 | matrix[row] = matrix_prev[row]; | |
115 | } | |
116 | ||
117 | _delay_us(5); | |
118 | KEY_PREV_OFF(); | |
119 | KEY_UNABLE(); | |
120 | ||
121 | // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE. | |
122 | // This takes 25us or more to make sure KEY_STATE returns to idle state. | |
123 | #ifdef HHKB_JP | |
124 | // Looks like JP needs faster scan due to its twice larger matrix | |
125 | // or it can drop keys in fast key typing | |
126 | _delay_us(30); | |
127 | #else | |
128 | _delay_us(75); | |
129 | #endif | |
130 | } | |
131 | if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32(); | |
132 | } | |
133 | // power off | |
134 | if (KEY_POWER_STATE() && | |
135 | (USB_DeviceState == DEVICE_STATE_Suspended || | |
136 | USB_DeviceState == DEVICE_STATE_Unattached ) && | |
137 | timer_elapsed32(matrix_last_modified) > MATRIX_POWER_SAVE) { | |
138 | KEY_POWER_OFF(); | |
139 | suspend_power_down(); | |
140 | } | |
141 | return 1; | |
142 | } | |
143 | ||
144 | inline | |
145 | matrix_row_t matrix_get_row(uint8_t row) | |
146 | { | |
147 | return matrix[row]; | |
148 | } | |
149 | ||
150 | void matrix_power_up(void) { | |
151 | KEY_POWER_ON(); | |
152 | } | |
153 | void matrix_power_down(void) { | |
154 | KEY_POWER_OFF(); | |
155 | } |