2 Copyright 2011 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>
35 // matrix power saving
36 #define MATRIX_POWER_SAVE 10000
37 static uint32_t matrix_last_modified = 0;
38 static bool matrix_power = true;
40 // matrix state buffer(1:on, 0:off)
41 static matrix_row_t *matrix;
42 static matrix_row_t *matrix_prev;
43 static matrix_row_t _matrix0[MATRIX_ROWS];
44 static matrix_row_t _matrix1[MATRIX_ROWS];
48 uint8_t matrix_rows(void)
54 uint8_t matrix_cols(void)
59 void matrix_init(void)
63 debug_keyboard = true;
68 // initialize matrix state: all keys off
69 for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
70 for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
72 matrix_prev = _matrix1;
75 uint8_t matrix_scan(void)
84 for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
85 for (uint8_t col = 0; col < MATRIX_COLS; col++) {
89 // Not sure this is needed. This just emulates HHKB controller's behaviour.
90 if (matrix_prev[row] & (1<<col)) {
95 // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
96 // If V-USB interrupts in this section we could lose 40us or so
97 // and would read invalid value from KEY_STATE.
98 uint8_t last = TIMER_RAW;
102 // Wait for KEY_STATE outputs its value.
103 // 1us was ok on one HHKB, but not worked on another.
104 // no wait doesn't work on Teensy++ with pro(1us works)
105 // no wait does work on tmk PCB(8MHz) with pro2
106 // 1us wait does work on both of above
107 // 1us wait doesn't work on tmk(16MHz)
108 // 5us wait does work on tmk(16MHz)
109 // 5us wait does work on tmk(16MHz/2)
110 // 5us wait does work on tmk(8MHz)
111 // 10us wait does work on Teensy++ with pro
112 // 10us wait does work on 328p+iwrap with pro
113 // 10us wait doesn't work on tmk PCB(8MHz) with pro2(very lagged scan)
117 matrix[row] &= ~(1<<col);
119 matrix[row] |= (1<<col);
122 // Ignore if this code region execution time elapses more than 20us.
123 // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us]
124 // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b)
125 if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
126 matrix[row] = matrix_prev[row];
133 // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
134 // This takes 25us or more to make sure KEY_STATE returns to idle state.
137 if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32();
143 bool matrix_is_modified(void)
145 for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
146 if (matrix[i] != matrix_prev[i])
153 bool matrix_has_ghost(void)
159 bool matrix_is_on(uint8_t row, uint8_t col)
161 return (matrix[row] & (1<<col));
165 matrix_row_t matrix_get_row(uint8_t row)
170 void matrix_print(void)
172 print("\nr/c 01234567\n");
173 for (uint8_t row = 0; row < matrix_rows(); row++) {
174 xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
178 void matrix_power_up(void) {
179 if (matrix_power) return;
183 void matrix_power_down(void) {
184 if (!matrix_power) return;
185 // doesn't power save while USB connection is active
186 if (USB_DeviceState != DEVICE_STATE_Unattached) return;
187 if (timer_elapsed32(matrix_last_modified) <= MATRIX_POWER_SAVE) return;
189 suspend_power_down();
190 matrix_power = false;