/* 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; }