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tmk_keyboard_custom/keyboard/macway/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/>.
*/
/*
* scan matrix
*/
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#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#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 "matrix.h"
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#ifndef DEBOUNCE
# define DEBOUNCE 5
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#endif
static uint8_t debouncing = DEBOUNCE;
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/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
#ifdef MATRIX_HAS_GHOST
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static bool matrix_has_ghost_in_row(uint8_t row);
#endif
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static matrix_row_t read_cols(void);
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static void unselect_rows(void);
static void select_row(uint8_t row);
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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;
}
void matrix_init(void)
{
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// initialize row and col
unselect_rows();
// Input with pull-up(DDR:0, PORT:1)
DDRB = 0x00;
PORTB = 0xFF;
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// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
matrix_debouncing[i] = 0;
}
}
uint8_t matrix_scan(void)
{
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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select_row(i);
_delay_us(30); // without this wait read unstable value.
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matrix_row_t cols = read_cols();
if (matrix_debouncing[i] != cols) {
matrix_debouncing[i] = cols;
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if (debouncing) {
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debug("bounce!: "); debug_hex(debouncing); debug("\n");
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}
debouncing = DEBOUNCE;
}
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unselect_rows();
}
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if (debouncing) {
if (--debouncing) {
_delay_ms(1);
} else {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
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}
return 1;
}
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bool matrix_is_modified(void)
{
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if (debouncing) return false;
return true;
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}
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inline
bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & ((matrix_row_t)1<<col));
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}
inline
matrix_row_t matrix_get_row(uint8_t row)
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{
return matrix[row];
}
void matrix_print(void)
{
print("\nr/c 01234567\n");
for (uint8_t row = 0; row < matrix_rows(); row++) {
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phex(row); print(": ");
pbin_reverse(matrix_get_row(row));
#ifdef MATRIX_HAS_GHOST
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if (matrix_has_ghost_in_row(row)) {
print(" <ghost");
}
#endif
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print("\n");
}
}
#ifdef MATRIX_HAS_GHOST
inline
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static bool matrix_has_ghost_in_row(uint8_t row)
{
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// no ghost exists in case less than 2 keys on
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if (((matrix[row] - 1) & matrix[row]) == 0)
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return false;
// ghost exists in case same state as other row
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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if (i != row && (matrix[i] & matrix[row]))
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return true;
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}
return false;
}
#endif
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inline
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static matrix_row_t read_cols(void)
{
return ~PINB;
}
inline
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static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
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DDRC &= ~0b01000000; // PC: 6
PORTC &= ~0b01000000;
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DDRD &= ~0b11100111; // PD: 7,6,5,2,1,0
PORTD &= ~0b11100111;
DDRF &= ~0b11000000; // PF: 7,6
PORTF &= ~0b11000000;
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}
inline
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
// row: 0 1 2 3 4 5 6 7 8
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// pin: PD0, PD5, PD7, PF6, PD6, PD1, PD2, PC6, PF7
switch (row) {
case 0:
DDRD |= (1<<0);
PORTD &= ~(1<<0);
break;
case 1:
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DDRD |= (1<<5);
PORTD &= ~(1<<5);
break;
case 2:
DDRD |= (1<<7);
PORTD &= ~(1<<7);
break;
case 3:
DDRF |= (1<<6);
PORTF &= ~(1<<6);
break;
case 4:
DDRD |= (1<<6);
PORTD &= ~(1<<6);
break;
case 5:
DDRD |= (1<<1);
PORTD &= ~(1<<1);
break;
case 6:
DDRD |= (1<<2);
PORTD &= ~(1<<2);
break;
case 7:
DDRC |= (1<<6);
PORTC &= ~(1<<6);
break;
case 8:
DDRF |= (1<<7);
PORTF &= ~(1<<7);
break;
}
}