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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<<2) ? 0 : ((matrix_row_t)1<<0)) |
(PIND&(1<<0) ? 0 : ((matrix_row_t)1<<1)) |
(PIND&(1<<1) ? 0 : ((matrix_row_t)1<<2)) |
(PINC&(1<<7) ? 0 : ((matrix_row_t)1<<3)) |
(PIND&(1<<5) ? 0 : ((matrix_row_t)1<<4)) |
(PIND&(1<<4) ? 0 : ((matrix_row_t)1<<5)) |
(PIND&(1<<2) ? 0 : ((matrix_row_t)1<<6)) |
(PIND&(1<<6) ? 0 : ((matrix_row_t)1<<7))
);
}
static void select_row(uint8_t row) {
switch (row) {
case 0: PORTB = (PORTB & ~0b01111110) | 0b00111010; break;
case 1: PORTB = (PORTB & ~0b01111110) | 0b01011000; break;
case 2: PORTB = (PORTB & ~0b01111110) | 0b01110000; break;
case 3: PORTB = (PORTB & ~0b01111110) | 0b01101110; break;
case 4: PORTB = (PORTB & ~0b01111110) | 0b01101100; break;
case 5: PORTB = (PORTB & ~0b01111110) | 0b01101010; break;
case 6: PORTB = (PORTB & ~0b01111110) | 0b01101000; break;
case 7: PORTB = (PORTB & ~0b01111110) | 0b01100100; break;
case 8: PORTB = (PORTB & ~0b01111110) | 0b01100000; break;
case 9: PORTB = (PORTB & ~0b01111110) | 0b01100010; break;
case 10: PORTB = (PORTB & ~0b01111110) | 0b00011010; break;
case 11: PORTB = (PORTB & ~0b01111110) | 0b00011000; break;
case 12: PORTB = (PORTB & ~0b01111110) | 0b00111100; break;
case 13: PORTB = (PORTB & ~0b01111110) | 0b01100110; break;
case 14: PORTB = (PORTB & ~0b01111110) | 0b00111000; break;
case 15: PORTB = (PORTB & ~0b01111110) | 0b01110010; break;
case 16: PORTB = (PORTB & ~0b01111110) | 0b00011110; break;
case 17: PORTB = (PORTB & ~0b01111110) | 0b00111110; break;
}
}
void matrix_init_custom(void) {
/* Column output pins */
DDRB |= 0b01111110;
/* Row input pins */
DDRC &= ~0b10000100;
DDRD &= ~0b01110111;
PORTC |= 0b10000100;
PORTD |= 0b01110111;
}
// 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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