/* Copyright 2014 Ralf Schmitt <ralf@bunkertor.net> 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 <stdint.h> #include <stdbool.h> #include <avr/io.h> #include <util/delay.h> #include "print.h" #include "debug.h" #include "util.h" #include "matrix.h" #ifndef DEBOUNCE # define DEBOUNCE 0 #endif static uint8_t debouncing = DEBOUNCE; static matrix_row_t matrix[MATRIX_ROWS]; static matrix_row_t matrix_debouncing[MATRIX_ROWS]; static uint8_t read_rows(void); static void init_rows(void); static void unselect_cols(void); static void select_col(uint8_t col); inline uint8_t matrix_rows(void) { return MATRIX_ROWS; } inline uint8_t matrix_cols(void) { return MATRIX_COLS; } void matrix_init(void) { unselect_cols(); init_rows(); for (uint8_t i=0; i < MATRIX_ROWS; i++) { matrix[i] = 0; matrix_debouncing[i] = 0; } } uint8_t matrix_scan(void) { for (uint8_t col = 0; col < MATRIX_COLS; col++) { select_col(col); _delay_us(3); uint8_t rows = read_rows(); for (uint8_t row = 0; row < MATRIX_ROWS; row++) { bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col); bool curr_bit = rows & (1<<row); if (prev_bit != curr_bit) { matrix_debouncing[row] ^= ((matrix_row_t)1<<col); debouncing = DEBOUNCE; } } unselect_cols(); } if (debouncing) { if (--debouncing) { _delay_ms(1); } else { for (uint8_t i = 0; i < MATRIX_ROWS; i++) { matrix[i] = matrix_debouncing[i]; } } } return 1; } bool matrix_is_modified(void) { if (debouncing) return false; return true; } inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1<<col)); } inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; } void matrix_print(void) { print("\nr/c 0123456789ABCDEF\n"); for (uint8_t row = 0; row < MATRIX_ROWS; row++) { xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row))); } } uint8_t matrix_key_count(void) { uint8_t count = 0; for (uint8_t i = 0; i < MATRIX_ROWS; i++) { count += bitpop32(matrix[i]); } return count; } /* Row pin configuration * * row: 0 1 2 3 4 5 6 7 * pin: PC2 PB1 PB2 PB3 PC7 PB4 PB5 PB6 * */ static void init_rows(void) { DDRC &= ~0b10000100; DDRB &= ~0b01111110; PORTC |= 0b10000100; PORTB |= 0b01111110; } static uint8_t read_rows(void) { return (PINC&(1<<2) ? 0 : (1<<0)) | (PINB&(1<<1) ? 0 : (1<<1)) | (PINB&(1<<2) ? 0 : (1<<2)) | (PINB&(1<<3) ? 0 : (1<<3)) | (PINC&(1<<7) ? 0 : (1<<4)) | (PINB&(1<<4) ? 0 : (1<<5)) | (PINB&(1<<5) ? 0 : (1<<6)) | (PINB&(1<<6) ? 0 : (1<<7)); } /* These columns uses two 74HC42 4 to 10 bit demultiplexers (low active). * * COL PD1 PD0 PD2 PD6 PD5 PD4 * 12 1 1 0 0 0 0 * 11 1 1 0 0 0 1 * 10 1 1 0 0 1 0 * 9 1 1 0 0 1 1 * 8 1 1 0 1 0 0 * 7 1 1 0 1 0 1 * 6 1 1 0 1 1 0 * 5 1 1 0 1 1 1 * 4 1 1 1 0 0 0 * 3 1 1 1 0 0 1 * COL PD2 PD6 PD1 PD0 PD5 PD4 * 2 1 1 0 0 0 0 * 1 1 1 0 0 0 1 * 0 1 1 0 0 1 0 * 17 1 1 0 0 1 1 * 16 1 1 0 1 0 0 * 1 1 0 1 0 1 * 1 1 0 1 1 0 * 15 1 1 0 1 1 1 * 14 1 1 1 0 0 0 * 13 1 1 1 0 0 1 */ static void unselect_cols(void) { DDRD |= 0b01110111; PORTD &= ~0b01110111; } static void select_col(uint8_t col) { switch (col) { case 0: PORTD |= (1<<5) | (1<<6) | (1<<2); break; case 1: PORTD |= (1<<4) | (1<<6) | (1<<2); break; case 2: PORTD |= (1<<6) | (1<<2); break; case 3: PORTD |= (1<<4) | (1<<2) | (1<<0) | (1<<1); break; case 4: PORTD |= (1<<2) | (1<<0) | (1<<1); break; case 5: PORTD |= (1<<4) | (1<<5) | (1<<6) | (1<<0) | (1<<1); break; case 6: PORTD |= (1<<5) | (1<<6) | (1<<0) | (1<<1); break; case 7: PORTD |= (1<<4) | (1<<6) | (1<<0) | (1<<1); break; case 8: PORTD |= (1<<6) | (1<<0) | (1<<1); break; case 9: PORTD |= (1<<4) | (1<<5) | (1<<0) | (1<<1); break; case 10: PORTD |= (1<<5) | (1<<0) | (1<<1); break; case 11: PORTD |= (1<<4) | (1<<0) | (1<<1); break; case 12: PORTD |= (1<<0) | (1<<1); break; case 13: PORTD |= (1<<4) | (1<<1) | (1<<6) | (1<<2); break; case 14: PORTD |= (1<<1) | (1<<6) | (1<<2); break; case 15: PORTD |= (1<<4) | (1<<5) | (1<<0) | (1<<6) | (1<<2); break; case 16: PORTD |= (1<<0) | (1<<6) | (1<<2); break; case 17: PORTD |= (1<<4) | (1<<5) | (1<<6) | (1<<2); break; } }