87 lines
3.3 KiB
C
87 lines
3.3 KiB
C
/*
|
|
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;
|
|
}
|