234 lines
6.4 KiB
C
234 lines
6.4 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 <avr/io.h>
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#include <avr/interrupt.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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// Timer resolution check
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#if (1000000/TIMER_RAW_FREQ > 20)
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# error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
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#endif
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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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// Matrix I/O ports
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//
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// row: HC4051[A,B,C] selects scan row0-7
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// col: LS145[A,B,C,D] selects scan col0-7 and enable(D)
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// key: on: 0/off: 1
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// prev: unknown: output previous key state(negated)?
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#if defined(__AVR_AT90USB1286__)
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// Ports for Teensy++
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// row: PB0-2
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// col: PB3-5,6
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// key: PE6(pull-uped)
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// prev: PE7
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#define KEY_INIT() do { \
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DDRB |= 0x7F; \
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DDRE |= (1<<7); \
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DDRE &= ~(1<<6); \
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PORTE |= (1<<6); \
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} while (0)
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#define KEY_SELECT(ROW, COL) (PORTB = (PORTB & 0xC0) | \
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(((COL) & 0x07)<<3) | \
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((ROW) & 0x07))
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#define KEY_ENABLE() (PORTB &= ~(1<<6))
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#define KEY_UNABLE() (PORTB |= (1<<6))
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#define KEY_STATE() (PINE & (1<<6))
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#define KEY_PREV_ON() (PORTE |= (1<<7))
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#define KEY_PREV_OFF() (PORTE &= ~(1<<7))
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#define KEY_POWER_ON()
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#define KEY_POWER_OFF()
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#elif defined(__AVR_ATmega328P__)
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// Ports for V-USB
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// key: PB0(pull-uped)
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// prev: PB1
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// row: PB2-4
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// col: PC0-2,3
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// power: PB5(Low:on/Hi-z:off)
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#define KEY_INIT() do { \
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DDRB |= 0x3E; \
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DDRB &= ~(1<<0); \
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PORTB |= 1<<0; \
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DDRC |= 0x0F; \
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KEY_UNABLE(); \
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KEY_PREV_OFF(); \
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} while (0)
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#define KEY_SELECT(ROW, COL) do { \
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PORTB = (PORTB & 0xE3) | ((ROW) & 0x07)<<2; \
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PORTC = (PORTC & 0xF8) | ((COL) & 0x07); \
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} while (0)
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#define KEY_ENABLE() (PORTC &= ~(1<<3))
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#define KEY_UNABLE() (PORTC |= (1<<3))
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#define KEY_STATE() (PINB & (1<<0))
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#define KEY_PREV_ON() (PORTB |= (1<<1))
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#define KEY_PREV_OFF() (PORTB &= ~(1<<1))
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// Power supply switching
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#define KEY_POWER_ON() do { \
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KEY_INIT(); \
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PORTB &= ~(1<<5); \
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_delay_ms(1); \
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} while (0)
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#define KEY_POWER_OFF() do { \
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DDRB &= ~0x3F; \
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PORTB &= ~0x3F; \
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DDRC &= ~0x0F; \
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PORTC &= ~0x0F; \
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} while (0)
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#else
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# error "define code for matrix scan"
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#endif
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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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print_enable = true;
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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(40);
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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(7);
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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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_delay_us(10);
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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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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(150);
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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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