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/* |
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Copyright 2017 Luiz Ribeiro <luizribeiro@gmail.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 <avr/io.h> |
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#include <util/delay.h> |
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#include "matrix.h" |
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#ifndef DEBOUNCE |
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# define DEBOUNCE 5 |
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#endif |
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static uint8_t debouncing = DEBOUNCE; |
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static matrix_row_t matrix[MATRIX_ROWS]; |
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static matrix_row_t matrix_debouncing[MATRIX_ROWS]; |
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void matrix_init(void) { |
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// all outputs for rows high |
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DDRB = 0xFF; |
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PORTB = 0xFF; |
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// all inputs for columns |
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DDRA = 0x00; |
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DDRC &= ~(0x111111<<2); |
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DDRD &= ~(1<<PIND7); |
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// all columns are pulled-up |
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PORTA = 0xFF; |
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PORTC |= (0b111111<<2); |
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PORTD |= (1<<PIND7); |
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// initialize matrix state: all keys off |
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) { |
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matrix[row] = 0x00; |
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matrix_debouncing[row] = 0x00; |
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} |
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// activate backlight |
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//PORTD |= (1 << 4); |
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//_SFR_IO8(0x09) |= (1 << 4); //_BV(0x94 & 0xF); |
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// |
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// this is the code that *should* be executed in quantum.c |
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_SFR_IO8(0x12) |= _BV(0x4); |
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} |
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void matrix_set_row_status(uint8_t row) { |
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DDRB = (1 << row); |
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PORTB = ~(1 << row); |
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} |
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uint8_t bit_reverse(uint8_t x) { |
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x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa); |
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x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc); |
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x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0); |
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return x; |
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} |
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uint8_t matrix_scan(void) { |
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) { |
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matrix_set_row_status(row); |
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_delay_us(5); |
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matrix_row_t cols = ( |
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// cols 0..7, PORTA 0 -> 7 |
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(~PINA) & 0xFF |
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) | ( |
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// cols 8..13, PORTC 7 -> 0 |
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bit_reverse((~PINC) & 0xFF) << 8 |
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) | ( |
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// col 14, PORTD 7 |
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((~PIND) & (1 << PIND7)) << 7 |
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); |
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if (matrix_debouncing[row] != cols) { |
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matrix_debouncing[row] = cols; |
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debouncing = DEBOUNCE; |
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} |
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} |
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if (debouncing) { |
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if (--debouncing) { |
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_delay_ms(1); |
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} else { |
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) { |
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matrix[i] = matrix_debouncing[i]; |
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} |
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} |
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} |
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matrix_scan_user(); |
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return 1; |
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} |
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inline matrix_row_t matrix_get_row(uint8_t row) { |
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return matrix[row]; |
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} |
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void matrix_print(void) { |
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} |