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- /*
- Copyright 2014 Ralf Schmitt <[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/>.
- */
-
- #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;
- }
- }
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