/* 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; }