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/* |
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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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} |