/* Copyright 2018 Carlos Filoteo 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/>. */ /* * scan matrix */ #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" #ifdef LED_ENABLE #include "protocol/serial.h" #endif #ifndef DEBOUNCE # define DEBOUNCE 5 #endif static uint8_t debouncing = DEBOUNCE; /* matrix state(1:on, 0:off) */ static matrix_row_t matrix[MATRIX_ROWS]; static matrix_row_t matrix_debouncing[MATRIX_ROWS]; static matrix_row_t read_cols(void); static void init_cols(void); static void unselect_rows(void); static void select_row(uint8_t row); inline uint8_t matrix_rows(void) { return MATRIX_ROWS; } inline uint8_t matrix_cols(void) { return MATRIX_COLS; } void matrix_init(void) { // initialize row and col unselect_rows(); init_cols(); // initialize matrix state: all keys off for (uint8_t i=0; i < MATRIX_ROWS; i++) { matrix[i] = 0; matrix_debouncing[i] = 0; } #ifdef LED_ENABLE serial_init(); #endif } uint8_t matrix_scan(void) { for (uint8_t i = 0; i < MATRIX_ROWS; i++) { select_row(i); _delay_us(30); // without this wait read unstable value. matrix_row_t cols = read_cols(); if (matrix_debouncing[i] != cols) { matrix_debouncing[i] = cols; if (debouncing) { debug("bounce!: "); debug_hex(debouncing); debug("\n"); } debouncing = DEBOUNCE; } unselect_rows(); } 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++) { print_hex8(row); print(": "); print_bin_reverse16(matrix_get_row(row)); print("\n"); } } uint8_t matrix_key_count(void) { uint8_t count = 0; for (uint8_t i = 0; i < MATRIX_ROWS; i++) { count += bitpop16(matrix[i]); } return count; } /* Column pin configuration * col: 0 1 2 3 4 5 6 7 8 9 10 11 * pin: D7 E6 B4 B5 B6 B2 B3 B1 F7 F6 F5 F4 */ static void init_cols(void) { // Input with pull-up(DDR:0, PORT:1) DDRF &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7); PORTF |= (1<<4 | 1<<5 | 1<<6 | 1<<7); DDRE &= ~(1<<6); PORTE |= (1<<6); DDRD &= ~(1<<7); PORTD |= (1<<7); DDRB &= ~(1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 | 1<<6); PORTB |= (1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 | 1<<6); } static matrix_row_t read_cols(void) { return (PIND&(1<<7) ? 0 : (1<<0)) | (PINE&(1<<6) ? 0 : (1<<1)) | (PINB&(1<<4) ? 0 : (1<<2)) | (PINB&(1<<5) ? 0 : (1<<3)) | (PINB&(1<<6) ? 0 : (1<<4)) | (PINB&(1<<2) ? 0 : (1<<5)) | (PINB&(1<<3) ? 0 : (1<<6)) | (PINB&(1<<1) ? 0 : (1<<7)) | (PINF&(1<<7) ? 0 : (1<<8)) | (PINF&(1<<6) ? 0 : (1<<9)) | (PINF&(1<<5) ? 0 : (1<<10)) | (PINF&(1<<4) ? 0 : (1<<11)); } /* Row pin configuration * row: 0 1 2 3 * pin: D1 D0 D4 C6 */ static void unselect_rows(void) { // Hi-Z(DDR:0, PORT:0) to unselect DDRD &= ~0b00010011; PORTD &= ~0b00010011; DDRC &= ~0b01000000; PORTC &= ~0b01000000; } static void select_row(uint8_t row) { // Output low(DDR:1, PORT:0) to select switch (row) { case 0: DDRD |= (1<<1); PORTD &= ~(1<<1); break; case 1: DDRD |= (1<<0); PORTD &= ~(1<<0); break; case 2: DDRD |= (1<<4); PORTD &= ~(1<<4); break; case 3: DDRC |= (1<<6); PORTC &= ~(1<<6); break; } }