188 lines
4.5 KiB
C
188 lines
4.5 KiB
C
/*
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Copyright 2012 Jun Wako <wakojun@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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/*
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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "print.h"
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#include "debug.h"
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#include "util.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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/* matrix state(1:on, 0:off) */
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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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static matrix_row_t read_cols(void);
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static void init_cols(void);
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static void unselect_rows(void);
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static void select_row(uint8_t row);
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inline
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uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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// enable usb for FaceU
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DDRD |= (1<<PD5);
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PORTD &= ~(1<<PD5);
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// initialize row and col
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unselect_rows();
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init_cols();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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matrix_debouncing[i] = 0;
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}
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}
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uint8_t matrix_scan(void)
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{
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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select_row(i);
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_delay_us(30); // without this wait read unstable value.
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matrix_row_t cols = read_cols();
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if (matrix_debouncing[i] != cols) {
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matrix_debouncing[i] = cols;
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if (debouncing) {
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debug("bounce!: "); debug_hex(debouncing); debug("\n");
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}
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debouncing = DEBOUNCE;
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}
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unselect_rows();
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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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return 1;
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}
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bool matrix_is_modified(void)
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{
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if (debouncing) return false;
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return true;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & ((matrix_row_t)1<<col));
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 0123456789ABCDEF\n");
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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phex(row); print(": ");
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pbin_reverse16(matrix_get_row(row));
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print("\n");
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}
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}
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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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count += bitpop16(matrix[i]);
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}
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return count;
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}
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/* Column pin configuration
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* pin: B0 B1 B2 B3 B4 B5 B6 B7
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*/
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static void init_cols(void)
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{
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// Input with pull-up(DDR:0, PORT:1)
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DDRB &= ~(1<<PB7 | 1<<PB6 | 1<<PB5 | 1<<PB4 | 1<<PB3 | 1<<PB2 | 1<<PB1 | 1<<PB0);
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PORTB |= (1<<PB7 | 1<<PB6 | 1<<PB5 | 1<<PB4 | 1<<PB3 | 1<<PB2 | 1<<PB1 | 1<<PB0);
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}
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/* Column pin configuration
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* col: 0 1 2 3 4 5 6 7
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* pin: B0 B1 B2 B3 B4 B5 B6 B7
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*/
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static matrix_row_t read_cols(void)
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{
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return PINB & (1<<PB7 | 1<<PB6 | 1<<PB5 | 1<<PB4 | 1<<PB3 | 1<<PB2 | 1<<PB1 | 1<<PB0);
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}
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/* Row pin configuration
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* pin: A0 A1 A2 A3 A4 A5 A6 A7 C7 C6 C5 C4 C3 C2 C1 C0
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*/
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static void unselect_rows(void)
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{
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// Hi-Z(DDR:0, PORT:0) to unselect
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DDRA &= ~(1<<PA7 | 1<<PA6 | 1<<PA5 | 1<<PA4 | 1<<PA3 | 1<<PA2 | 1<<PA1 | 1<<PA0);
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PORTA &= ~(1<<PA7 | 1<<PA6 | 1<<PA5 | 1<<PA4 | 1<<PA3 | 1<<PA2 | 1<<PA1 | 1<<PA0);
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DDRD &= ~(1<<PD7 | 1<<PD6 | 1<<PD5 | 1<<PD4 | 1<<PD3 | 1<<PD2 | 1<<PD1 | 1<<PD0);
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PORTD &= ~(1<<PD7 | 1<<PD6 | 1<<PD5 | 1<<PD4 | 1<<PD3 | 1<<PD2 | 1<<PD1 | 1<<PD0);
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}
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/* Row pin configuration
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* row: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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* pin: A0 A1 A2 A3 A4 A5 A6 A7 C7 C6 C5 C4 C3 C2 C1 C0
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*/
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static void select_row(uint8_t row)
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{
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// Output low(DDR:1, PORT:0) to select
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if (row < 8) {
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DDRA |= (1 << row);
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PORTA &= ~(1 << row);
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}
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else {
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DDRD |= (1 << (15 - row));
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PORTD &= ~(1 << (15 - row));
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}
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}
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