/* 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; /* matrix state(1:on, 0:off) */ static matrix_row_t matrix[MATRIX_ROWS]; static matrix_row_t matrix_debouncing[MATRIX_ROWS]; static uint8_t read_rows(void); static uint8_t read_fwkey(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(); // initialize matrix state: all keys off 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++) { // 0-17 select_col(col); _delay_us(3); // TODO: Determine the correct value needed here. uint8_t rows = read_rows(); // Use the otherwise unused col: 12 row: 3 for firmware. if(col == 12) { rows |= read_fwkey(); } for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5 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); if (debouncing) { dprint("bounce!: "); dprintf("%02X", debouncing); dprintln(); } 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 * pin: PD0 PD1 PD2 PD3 PD5 PB7 * * Firmware uses its own pin PE2 */ static void init_rows(void) { // Input (DDR:0, PORT:0) DDRD &= ~0b00101111; PORTD &= ~0b00101111; DDRB &= ~(1<<7); PORTB &= ~(1<<7); // Input with pull-up (DDR:0, PORT:1) DDRE &= ~(1<<2); PORTE |= (1<<2); } static uint8_t read_rows(void) { return (PIND&(1<<0) ? (1<<0) : 0) | (PIND&(1<<1) ? (1<<1) : 0) | (PIND&(1<<2) ? (1<<2) : 0) | (PIND&(1<<3) ? (1<<3) : 0) | (PIND&(1<<5) ? (1<<4) : 0) | (PINB&(1<<7) ? (1<<5) : 0); } static uint8_t read_fwkey(void) { return PINE&(1<<2) ? 0 : (1<<3); } /* Columns 0 - 15 * These columns uses two 74HC237D 3 to 8 bit demultiplexers. * col / pin: PC6 PB6 PF0 PF1 PC7 * 0: 1 0 0 0 0 * 1: 1 0 1 0 0 * 2: 1 0 0 1 0 * 3: 1 0 1 1 0 * 4: 1 0 0 0 1 * 5: 1 0 1 0 1 * 6: 1 0 0 1 1 * 7: 1 0 1 1 1 * 8: 0 1 0 0 0 * 9: 0 1 1 0 0 * 10: 0 1 0 1 0 * 11: 0 1 1 1 0 * 12: 0 1 0 0 1 * 13: 0 1 1 0 1 * 14: 0 1 0 1 1 * 15: 0 1 1 1 1 * * col: 16 * pin: PB5 * * col: 17 * pin: PD4 */ static void unselect_cols(void) { DDRB |= (1<<5) | (1<<6); PORTB &= ~((1<<5) | (1<<6)); DDRC |= (1<<6) | (1<<7); PORTC &= ~((1<<6) | (1<<7)); DDRD |= (1<<4); PORTD &= ~(1<<4); DDRF |= (1<<0) | (1<<1); PORTF &= ~((1<<0) | (1<<1)); } static void select_col(uint8_t col) { // Output high (DDR:1, PORT:1) to select switch (col) { case 0: PORTC |= (1<<6); break; case 1: PORTC |= (1<<6); PORTF |= (1<<0); break; case 2: PORTC |= (1<<6); PORTF |= (1<<1); break; case 3: PORTC |= (1<<6); PORTF |= (1<<0) | (1<<1); break; case 4: PORTC |= (1<<6); PORTC |= (1<<7); break; case 5: PORTC |= (1<<6); PORTF |= (1<<0); PORTC |= (1<<7); break; case 6: PORTC |= (1<<6); PORTF |= (1<<1); PORTC |= (1<<7); break; case 7: PORTC |= (1<<6); PORTF |= (1<<0) | (1<<1); PORTC |= (1<<7); break; case 8: PORTB |= (1<<6); break; case 9: PORTB |= (1<<6); PORTF |= (1<<0); break; case 10: PORTB |= (1<<6); PORTF |= (1<<1); break; case 11: PORTB |= (1<<6); PORTF |= (1<<0) | (1<<1); break; case 12: PORTB |= (1<<6); PORTC |= (1<<7); break; case 13: PORTB |= (1<<6); PORTF |= (1<<0); PORTC |= (1<<7); break; case 14: PORTB |= (1<<6); PORTF |= (1<<1); PORTC |= (1<<7); break; case 15: PORTB |= (1<<6); PORTF |= (1<<0) | (1<<1); PORTC |= (1<<7); break; case 16: PORTB |= (1<<5); break; case 17: PORTD |= (1<<4); break; } }