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tmk_keyboard/hhkb/matrix.c

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/*
Copyright 2011 Jun Wako <wakojun@gmail.com>
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/>.
*/
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/*
* scan matrix
*/
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#include <stdint.h>
#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>
#include "print.h"
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#include "util.h"
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#include "matrix.h"
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#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)
#if (MATRIX_COLS <= 8)
static uint8_t *matrix;
static uint8_t *matrix_prev;
static uint8_t _matrix0[MATRIX_ROWS];
static uint8_t _matrix1[MATRIX_ROWS];
#else
static uint16_t *matrix;
static uint16_t *matrix_prev;
static uint16_t _matrix0[MATRIX_ROWS];
static uint16_t _matrix1[MATRIX_ROWS];
#endif
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// HHKB has no ghost and no bounce.
#ifdef MATRIX_HAS_GHOST
static bool matrix_has_ghost_in_row(uint8_t row);
#endif
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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
// 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)?
#ifdef HOST_PJRC
// 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))
#else
// Ports for V-USB
// key: PB0(pull-uped)
// prev: PB1
// row: PB2-4
// col: PC0-2,3
#define KEY_INIT() do { \
DDRB |= 0x1E; \
DDRB &= ~(1<<0); \
PORTB |= (1<<0); \
DDRC |= 0x0F; \
} 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))
#endif
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inline
uint8_t matrix_rows(void)
{
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return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
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return MATRIX_COLS;
}
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void matrix_init(void)
{
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KEY_INIT();
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// 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;
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matrix = _matrix0;
matrix_prev = _matrix1;
}
uint8_t matrix_scan(void)
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{
uint8_t *tmp;
tmp = matrix_prev;
matrix_prev = matrix;
matrix = tmp;
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
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KEY_SELECT(row, col);
_delay_us(40); // from logic analyzer chart
if (matrix_prev[row] & (1<<col)) {
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KEY_PREV_ON();
}
_delay_us(7); // from logic analyzer chart
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#if HOST_VUSB
// to avoid V-USB interrupt during read key state
uint8_t sreg = SREG;
cli();
#endif
KEY_ENABLE();
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_delay_us(10); // from logic analyzer chart
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if (KEY_STATE()) {
matrix[row] &= ~(1<<col);
} else {
matrix[row] |= (1<<col);
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}
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#if HOST_VUSB
SREG = sreg;
#endif
KEY_PREV_OFF();
KEY_UNABLE();
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_delay_us(150); // from logic analyzer chart
}
}
return 1;
}
bool matrix_is_modified(void)
{
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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if (matrix[i] != matrix_prev[i])
return true;
}
return false;
}
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inline
bool matrix_has_ghost(void)
{
#ifdef MATRIX_HAS_GHOST
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
if (matrix_has_ghost_in_row(i))
return true;
}
#endif
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return false;
}
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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
{
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return matrix[row];
}
void matrix_print(void)
{
#if (MATRIX_COLS <= 8)
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print("\nr/c 01234567\n");
#else
print("\nr/c 0123456789ABCDEF\n");
#endif
for (uint8_t row = 0; row < matrix_rows(); row++) {
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phex(row); print(": ");
#if (MATRIX_COLS <= 8)
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pbin_reverse(matrix_get_row(row));
#else
pbin_reverse16(matrix_get_row(row));
#endif
#ifdef MATRIX_HAS_GHOST
if (matrix_has_ghost_in_row(row)) {
print(" <ghost");
}
#endif
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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)
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count += bitpop(matrix[i]);
#else
count += bitpop16(matrix[i]);
#endif
}
return count;
}
#ifdef MATRIX_HAS_GHOST
inline
static bool matrix_has_ghost_in_row(uint8_t row)
{
// no ghost exists in case less than 2 keys on
if (((matrix[row] - 1) & matrix[row]) == 0)
return false;
// ghost exists in case same state as other row
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
if (i != row && (matrix[i] & matrix[row]) == matrix[row])
return true;
}
return false;
}
#endif