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- /*
- Copyright 2011 Jun Wako <[email protected]>
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- /*
- * scan matrix
- */
- #include <stdint.h>
- #include <stdbool.h>
- #include <util/delay.h>
- #include "print.h"
- #include "debug.h"
- #include "util.h"
- #include "timer.h"
- #include "matrix.h"
- #include "hhkb_avr.h"
- #include <avr/wdt.h>
- #include "suspend.h"
- #include "lufa.h"
-
-
- // matrix power saving
- #define MATRIX_POWER_SAVE 10000
- static uint32_t matrix_last_modified = 0;
-
- // matrix state buffer(1:on, 0:off)
- static matrix_row_t *matrix;
- static matrix_row_t *matrix_prev;
- static matrix_row_t _matrix0[MATRIX_ROWS];
- static matrix_row_t _matrix1[MATRIX_ROWS];
-
-
- void matrix_init(void)
- {
- #ifdef DEBUG
- debug_enable = true;
- debug_keyboard = true;
- #endif
-
- KEY_INIT();
-
- // initialize matrix state: all keys off
- for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
- for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
- matrix = _matrix0;
- matrix_prev = _matrix1;
- }
-
- uint8_t matrix_scan(void)
- {
- uint8_t *tmp;
-
- tmp = matrix_prev;
- matrix_prev = matrix;
- matrix = tmp;
-
- // power on
- if (!KEY_POWER_STATE()) KEY_POWER_ON();
- for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
- for (uint8_t col = 0; col < MATRIX_COLS; col++) {
- KEY_SELECT(row, col);
- _delay_us(5);
-
- // Not sure this is needed. This just emulates HHKB controller's behaviour.
- if (matrix_prev[row] & (1<<col)) {
- KEY_PREV_ON();
- }
- _delay_us(10);
-
- // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
- // If V-USB interrupts in this section we could lose 40us or so
- // and would read invalid value from KEY_STATE.
- uint8_t last = TIMER_RAW;
-
- KEY_ENABLE();
-
- // Wait for KEY_STATE outputs its value.
- // 1us was ok on one HHKB, but not worked on another.
- // no wait doesn't work on Teensy++ with pro(1us works)
- // no wait does work on tmk PCB(8MHz) with pro2
- // 1us wait does work on both of above
- // 1us wait doesn't work on tmk(16MHz)
- // 5us wait does work on tmk(16MHz)
- // 5us wait does work on tmk(16MHz/2)
- // 5us wait does work on tmk(8MHz)
- // 10us wait does work on Teensy++ with pro
- // 10us wait does work on 328p+iwrap with pro
- // 10us wait doesn't work on tmk PCB(8MHz) with pro2(very lagged scan)
- _delay_us(5);
-
- if (KEY_STATE()) {
- matrix[row] &= ~(1<<col);
- } else {
- matrix[row] |= (1<<col);
- }
-
- // Ignore if this code region execution time elapses more than 20us.
- // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us]
- // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b)
- if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
- matrix[row] = matrix_prev[row];
- }
-
- _delay_us(5);
- KEY_PREV_OFF();
- KEY_UNABLE();
-
- // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
- // This takes 25us or more to make sure KEY_STATE returns to idle state.
- #ifdef HHKB_JP
- // Looks like JP needs faster scan due to its twice larger matrix
- // or it can drop keys in fast key typing
- _delay_us(30);
- #else
- _delay_us(75);
- #endif
- }
- if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32();
- }
- // power off
- if (KEY_POWER_STATE() &&
- (USB_DeviceState == DEVICE_STATE_Suspended ||
- USB_DeviceState == DEVICE_STATE_Unattached ) &&
- timer_elapsed32(matrix_last_modified) > MATRIX_POWER_SAVE) {
- KEY_POWER_OFF();
- suspend_power_down();
- }
- return 1;
- }
-
- inline
- matrix_row_t matrix_get_row(uint8_t row)
- {
- return matrix[row];
- }
-
- void matrix_power_up(void) {
- KEY_POWER_ON();
- }
- void matrix_power_down(void) {
- KEY_POWER_OFF();
- }
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