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/*
Copyright 2017 Gabriel Young <gabeplaysdrums@live.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/>.
*/
#include <util/delay.h>
#include "matrix.h"
static matrix_row_t scan_col(void) {
// Each of the 8 columns is read off pins as below
// 7 6 5 4 3 2 1 0
// ,--,--,--,--,--,--,--,--,
// |B0|B3|B2|B1|B6|B4|B5|C7|
// `--`--`--`--`--`--`--`--`
return (
(PINC&(1<<7) ? 0 : ((matrix_row_t)1<<0)) |
(PINB&(1<<5) ? 0 : ((matrix_row_t)1<<1)) |
(PINB&(1<<4) ? 0 : ((matrix_row_t)1<<2)) |
(PINB&(1<<6) ? 0 : ((matrix_row_t)1<<3)) |
(PINB&(1<<1) ? 0 : ((matrix_row_t)1<<4)) |
(PINB&(1<<2) ? 0 : ((matrix_row_t)1<<5)) |
(PINB&(1<<3) ? 0 : ((matrix_row_t)1<<6)) |
(PINB&(1<<0) ? 0 : ((matrix_row_t)1<<7))
);
}
static void select_row(uint8_t row) {
switch (row) {
case 0: PORTD = (PORTD & ~0b01111011) | 0b00011011; break;
case 1: PORTD = (PORTD & ~0b01111011) | 0b01000011; break;
case 2: PORTD = (PORTD & ~0b01111011) | 0b01101010; break;
case 3: PORTD = (PORTD & ~0b01111011) | 0b01111001; break;
case 4: PORTD = (PORTD & ~0b01111011) | 0b01100010; break;
case 5: PORTD = (PORTD & ~0b01111011) | 0b01110001; break;
case 6: PORTD = (PORTD & ~0b01111011) | 0b01100001; break;
case 7: PORTD = (PORTD & ~0b01111011) | 0b01110000; break;
case 8: PORTD = (PORTD & ~0b01111011) | 0b01100000; break;
case 9: PORTD = (PORTD & ~0b01111011) | 0b01101000; break;
case 10: PORTD = (PORTD & ~0b01111011) | 0b00101011; break;
case 11: PORTD = (PORTD & ~0b01111011) | 0b00110011; break;
case 12: PORTD = (PORTD & ~0b01111011) | 0b00100011; break;
case 13: PORTD = (PORTD & ~0b01111011) | 0b01111000; break;
case 14: PORTD = (PORTD & ~0b01111011) | 0b00010011; break;
case 15: PORTD = (PORTD & ~0b01111011) | 0b01101001; break;
case 16: PORTD = (PORTD & ~0b01111011) | 0b00001011; break;
case 17: PORTD = (PORTD & ~0b01111011) | 0b00111011; break;
}
}
void matrix_init_custom(void) {
/* Row output pins */
DDRD |= 0b01111011;
/* Column input pins */
DDRC &= ~0b10000000;
DDRB &= ~0b01111111;
PORTC |= 0b10000000;
PORTB |= 0b01111111;
}
// matrix is 18 uint8_t.
// we select the row (one of 18), then read the column
bool matrix_scan_custom(matrix_row_t current_matrix[]) {
bool has_changed = false;
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
matrix_row_t orig = current_matrix[row];
select_row(row);
_delay_us(3);
current_matrix[row] = scan_col();
has_changed |= (orig != current_matrix[row]);
}
return has_changed;
}
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