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86 lines
3.3 KiB
86 lines
3.3 KiB
/*
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Copyright 2017 Gabriel Young <gabeplaysdrums@live.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <util/delay.h>
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#include "matrix.h"
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static matrix_row_t scan_col(void) {
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// Each of the 8 columns is read off pins as below
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// 7 6 5 4 3 2 1 0
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// ,--,--,--,--,--,--,--,--,
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// |B0|B3|B2|B1|B6|B4|B5|C7|
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// `--`--`--`--`--`--`--`--`
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return (
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(PINC&(1<<2) ? 0 : ((matrix_row_t)1<<0)) |
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(PIND&(1<<0) ? 0 : ((matrix_row_t)1<<1)) |
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(PIND&(1<<1) ? 0 : ((matrix_row_t)1<<2)) |
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(PINC&(1<<7) ? 0 : ((matrix_row_t)1<<3)) |
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(PIND&(1<<5) ? 0 : ((matrix_row_t)1<<4)) |
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(PIND&(1<<4) ? 0 : ((matrix_row_t)1<<5)) |
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(PIND&(1<<2) ? 0 : ((matrix_row_t)1<<6)) |
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(PIND&(1<<6) ? 0 : ((matrix_row_t)1<<7))
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);
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}
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static void select_row(uint8_t row) {
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switch (row) {
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case 0: PORTB = (PORTB & ~0b01111110) | 0b00111010; break;
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case 1: PORTB = (PORTB & ~0b01111110) | 0b01011000; break;
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case 2: PORTB = (PORTB & ~0b01111110) | 0b01110000; break;
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case 3: PORTB = (PORTB & ~0b01111110) | 0b01101110; break;
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case 4: PORTB = (PORTB & ~0b01111110) | 0b01101100; break;
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case 5: PORTB = (PORTB & ~0b01111110) | 0b01101010; break;
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case 6: PORTB = (PORTB & ~0b01111110) | 0b01101000; break;
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case 7: PORTB = (PORTB & ~0b01111110) | 0b01100100; break;
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case 8: PORTB = (PORTB & ~0b01111110) | 0b01100000; break;
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case 9: PORTB = (PORTB & ~0b01111110) | 0b01100010; break;
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case 10: PORTB = (PORTB & ~0b01111110) | 0b00011010; break;
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case 11: PORTB = (PORTB & ~0b01111110) | 0b00011000; break;
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case 12: PORTB = (PORTB & ~0b01111110) | 0b00111100; break;
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case 13: PORTB = (PORTB & ~0b01111110) | 0b01100110; break;
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case 14: PORTB = (PORTB & ~0b01111110) | 0b00111000; break;
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case 15: PORTB = (PORTB & ~0b01111110) | 0b01110010; break;
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case 16: PORTB = (PORTB & ~0b01111110) | 0b00011110; break;
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case 17: PORTB = (PORTB & ~0b01111110) | 0b00111110; break;
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}
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}
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void matrix_init_custom(void) {
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/* Column output pins */
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DDRB |= 0b01111110;
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/* Row input pins */
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DDRC &= ~0b10000100;
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DDRD &= ~0b01110111;
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PORTC |= 0b10000100;
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PORTD |= 0b01110111;
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}
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// matrix is 18 uint8_t.
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// we select the row (one of 18), then read the column
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool has_changed = false;
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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matrix_row_t orig = current_matrix[row];
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select_row(row);
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_delay_us(3);
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current_matrix[row] = scan_col();
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has_changed |= (orig != current_matrix[row]);
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}
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return has_changed;
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}
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