167 lines
4.4 KiB
C
167 lines
4.4 KiB
C
/*
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Copyright 2011 Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <util/delay.h>
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "timer.h"
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#include "matrix.h"
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#include "hhkb_avr.h"
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// matrix state buffer(1:on, 0:off)
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static matrix_row_t *matrix;
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static matrix_row_t *matrix_prev;
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static matrix_row_t _matrix0[MATRIX_ROWS];
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static matrix_row_t _matrix1[MATRIX_ROWS];
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inline
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uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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#ifdef DEBUG
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debug_enable = true;
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debug_keyboard = true;
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#endif
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KEY_INIT();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
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for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
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matrix = _matrix0;
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matrix_prev = _matrix1;
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}
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uint8_t matrix_scan(void)
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{
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uint8_t *tmp;
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tmp = matrix_prev;
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matrix_prev = matrix;
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matrix = tmp;
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KEY_POWER_ON();
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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for (uint8_t col = 0; col < MATRIX_COLS; col++) {
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KEY_SELECT(row, col);
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_delay_us(5);
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// Not sure this is needed. This just emulates HHKB controller's behaviour.
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if (matrix_prev[row] & (1<<col)) {
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KEY_PREV_ON();
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}
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_delay_us(10);
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// NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
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// If V-USB interrupts in this section we could lose 40us or so
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// and would read invalid value from KEY_STATE.
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uint8_t last = TIMER_RAW;
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KEY_ENABLE();
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// Wait for KEY_STATE outputs its value.
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// 1us was ok on one HHKB, but not worked on another.
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// no wait doesn't work on Teensy++ with pro(1us works)
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// no wait does work on tmk PCB(8MHz) with pro2
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// 1us wait does work on both of above
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// 1us wait doesn't work on tmk(16MHz)
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// 5us wait does work on tmk(16MHz)
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// 5us wait does work on tmk(16MHz/2)
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// 5us wait does work on tmk(8MHz)
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// 10us wait does work on Teensy++ with pro
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// 10us wait does work on 328p+iwrap with pro
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// 10us wait doesn't work on tmk PCB(8MHz) with pro2(very lagged scan)
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_delay_us(5);
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if (KEY_STATE()) {
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matrix[row] &= ~(1<<col);
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} else {
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matrix[row] |= (1<<col);
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}
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// Ignore if this code region execution time elapses more than 20us.
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// MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us]
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// MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b)
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if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
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matrix[row] = matrix_prev[row];
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}
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_delay_us(5);
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KEY_PREV_OFF();
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KEY_UNABLE();
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// NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
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// This takes 25us or more to make sure KEY_STATE returns to idle state.
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_delay_us(75);
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}
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}
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KEY_POWER_OFF();
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return 1;
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}
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bool matrix_is_modified(void)
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{
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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if (matrix[i] != matrix_prev[i])
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return true;
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}
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return false;
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}
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inline
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bool matrix_has_ghost(void)
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{
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return false;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & (1<<col));
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 01234567\n");
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for (uint8_t row = 0; row < matrix_rows(); row++) {
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xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
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}
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}
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