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- /*
- Copyright 2012 Jun Wako <[email protected]>
-
- 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"
-
- #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)
- {
- // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
- MCUCR |= (1<<JTD);
- MCUCR |= (1<<JTD);
-
- backlight_init_ports();
-
- // 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;
- }
- }
-
- 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++) {
- phex(row); print(": ");
- pbin_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
- * pin: D4, C6, D7, E6
- */
-
- static void init_cols(void)
- {
- // Input with pull-up(DDR:0, PORT:1)
- DDRC &= ~(1<<6);
- PORTC |= (1<<6);
- DDRD &= ~(1<<4 | 1<<7 );
- PORTD |= (1<<4 | 1<<7 );
- DDRE &= ~(1<<6);
- PORTE |= (1<<6);
- }
-
- static matrix_row_t read_cols(void)
- {
-
- //LED on Top of switch
- return (PIND&(1<<4) ? 0 : (1<<0)) |
- (PINC&(1<<6) ? 0 : (1<<1)) |
- (PIND&(1<<7) ? 0 : (1<<2)) |
- (PINE&(1<<6) ? 0 : (1<<3));
- }
-
- /* Row pin configuration
- * row: 0 1 2
- * pin: B4, B5, B6
- */
-
- static void unselect_rows(void)
- {
- // Hi-Z(DDR:0, PORT:0) to unselect
- DDRB &= ~0b01110000;
- PORTB &= ~0b01110000;
- }
-
- static void select_row(uint8_t row)
- {
- // Output low(DDR:1, PORT:0) to select
- //LED on Top of switch
- switch (row) {
- case 0:
- DDRB |= (1<<4);
- PORTB &= ~(1<<4);
- break;
- case 1:
- DDRB |= (1<<5);
- PORTB &= ~(1<<5);
- break;
- case 2:
- DDRB |= (1<<6);
- PORTB &= ~(1<<6);
- break;
- }
-
- bl_set();
- }
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