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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 <avr/io.h>
- #include <avr/interrupt.h>
- #include <util/delay.h>
- #include "print.h"
- #include "debug.h"
- #include "util.h"
- #include "timer.h"
- #include "matrix.h"
-
-
- // Timer resolution check
- #if (1000000/TIMER_RAW_FREQ > 20)
- # error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
- #endif
-
- #if (MATRIX_COLS > 16)
- # error "MATRIX_COLS must not exceed 16"
- #endif
- #if (MATRIX_ROWS > 255)
- # error "MATRIX_ROWS must not exceed 255"
- #endif
-
-
- // 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];
-
-
- // Matrix I/O ports
- //
- // row: HC4051[A,B,C] selects scan row0-7
- // col: LS145[A,B,C,D] selects scan col0-7 and enable(D)
- // key: on: 0/off: 1
- // prev: unknown: output previous key state(negated)?
-
- #if defined(__AVR_AT90USB1286__)
- // Ports for Teensy++
- // row: PB0-2
- // col: PB3-5,6
- // key: PE6(pull-uped)
- // prev: PE7
- #define KEY_INIT() do { \
- DDRB |= 0x7F; \
- DDRE |= (1<<7); \
- DDRE &= ~(1<<6); \
- PORTE |= (1<<6); \
- } while (0)
- #define KEY_SELECT(ROW, COL) (PORTB = (PORTB & 0xC0) | \
- (((COL) & 0x07)<<3) | \
- ((ROW) & 0x07))
- #define KEY_ENABLE() (PORTB &= ~(1<<6))
- #define KEY_UNABLE() (PORTB |= (1<<6))
- #define KEY_STATE() (PINE & (1<<6))
- #define KEY_PREV_ON() (PORTE |= (1<<7))
- #define KEY_PREV_OFF() (PORTE &= ~(1<<7))
- #define KEY_POWER_ON()
- #define KEY_POWER_OFF()
-
- #elif defined(__AVR_ATmega328P__)
- // Ports for V-USB
- // key: PB0(pull-uped)
- // prev: PB1
- // row: PB2-4
- // col: PC0-2,3
- // power: PB5(Low:on/Hi-z:off)
- #define KEY_INIT() do { \
- DDRB |= 0x3E; \
- DDRB &= ~(1<<0); \
- PORTB |= 1<<0; \
- DDRC |= 0x0F; \
- KEY_UNABLE(); \
- KEY_PREV_OFF(); \
- } while (0)
- #define KEY_SELECT(ROW, COL) do { \
- PORTB = (PORTB & 0xE3) | ((ROW) & 0x07)<<2; \
- PORTC = (PORTC & 0xF8) | ((COL) & 0x07); \
- } while (0)
- #define KEY_ENABLE() (PORTC &= ~(1<<3))
- #define KEY_UNABLE() (PORTC |= (1<<3))
- #define KEY_STATE() (PINB & (1<<0))
- #define KEY_PREV_ON() (PORTB |= (1<<1))
- #define KEY_PREV_OFF() (PORTB &= ~(1<<1))
- // Power supply switching
- #define KEY_POWER_ON() do { \
- KEY_INIT(); \
- PORTB &= ~(1<<5); \
- _delay_ms(1); \
- } while (0)
- #define KEY_POWER_OFF() do { \
- DDRB &= ~0x3F; \
- PORTB &= ~0x3F; \
- DDRC &= ~0x0F; \
- PORTC &= ~0x0F; \
- } while (0)
-
- #else
- # error "define code for matrix scan"
- #endif
-
-
- inline
- uint8_t matrix_rows(void)
- {
- return MATRIX_ROWS;
- }
-
- inline
- uint8_t matrix_cols(void)
- {
- return MATRIX_COLS;
- }
-
- void matrix_init(void)
- {
- #ifdef DEBUG
- print_enable = true;
- 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;
-
- 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(40);
-
- // Not sure this is needed. This just emulates HHKB controller's behaviour.
- if (matrix_prev[row] & (1<<col)) {
- KEY_PREV_ON();
- }
- _delay_us(7);
-
- // 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.
- _delay_us(10);
- 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];
- }
-
- 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.
- _delay_us(150);
- }
- }
- KEY_POWER_OFF();
- return 1;
- }
-
- bool matrix_is_modified(void)
- {
- for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- if (matrix[i] != matrix_prev[i])
- return true;
- }
- return false;
- }
-
- inline
- bool matrix_has_ghost(void)
- {
- return false;
- }
-
- inline
- bool matrix_is_on(uint8_t row, uint8_t col)
- {
- return (matrix[row] & (1<<col));
- }
-
- inline
- #if (MATRIX_COLS <= 8)
- uint8_t matrix_get_row(uint8_t row)
- #else
- uint16_t matrix_get_row(uint8_t row)
- #endif
- {
- return matrix[row];
- }
-
- void matrix_print(void)
- {
- #if (MATRIX_COLS <= 8)
- print("\nr/c 01234567\n");
- #else
- print("\nr/c 0123456789ABCDEF\n");
- #endif
- for (uint8_t row = 0; row < matrix_rows(); row++) {
- phex(row); print(": ");
- #if (MATRIX_COLS <= 8)
- pbin_reverse(matrix_get_row(row));
- #else
- pbin_reverse16(matrix_get_row(row));
- #endif
- print("\n");
- }
- }
-
- uint8_t matrix_key_count(void)
- {
- uint8_t count = 0;
- for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- #if (MATRIX_COLS <= 8)
- count += bitpop(matrix[i]);
- #else
- count += bitpop16(matrix[i]);
- #endif
- }
- return count;
- }
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