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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/>.
- */
-
- #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"
-
-
- /*
- * Happy Buckling Keyboard(IBM Model M mod)
- *
- * Pin usage:
- * COL: PD0-7
- * ROW: PB0-7, PF4-7
- */
- #ifndef DEBOUNCE
- # define DEBOUNCE 10
- #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];
-
- #ifdef MATRIX_HAS_GHOST
- static bool matrix_has_ghost_in_row(uint8_t row);
- #endif
- static matrix_row_t read_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)
- {
- // JTAG disable for PORT F. write JTD bit twice within four cycles.
- MCUCR |= (1<<JTD);
- MCUCR |= (1<<JTD);
-
- // initialize rows
- unselect_rows();
-
- // initialize columns to input with pull-up(DDR:0, PORT:1)
- DDRD = 0x00;
- PORTD = 0xFF;
-
- // 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 01234567\n");
- for (uint8_t row = 0; row < matrix_rows(); row++) {
- phex(row); print(": ");
- pbin_reverse(matrix_get_row(row));
- #ifdef MATRIX_HAS_GHOST
- if (matrix_has_ghost_in_row(row)) {
- print(" <ghost");
- }
- #endif
- print("\n");
- }
- }
-
- #ifdef MATRIX_HAS_GHOST
- inline
- static bool matrix_has_ghost_in_row(uint8_t row)
- {
- // no ghost exists in case less than 2 keys on
- if (((matrix[row] - 1) & matrix[row]) == 0)
- return false;
-
- // ghost exists in case same state as other row
- for (uint8_t i=0; i < MATRIX_ROWS; i++) {
- if (i != row && (matrix[i] & matrix[row]))
- return true;
- }
- return false;
- }
- #endif
-
- inline
- static matrix_row_t read_cols(void)
- {
- return ~PIND;
- }
-
- inline
- static void unselect_rows(void)
- {
- // Hi-Z(DDR:0, PORT:0) to unselect
- DDRB &= ~0b11111111;
- PORTB &= ~0b11111111;
- DDRF &= ~0b11110000;
- PORTF &= ~0b11110000;
- }
-
- inline
- static void select_row(uint8_t row)
- {
- // Output low(DDR:1, PORT:0) to select
- switch (row) {
- case 0:
- case 1:
- case 2:
- case 3:
- case 4:
- case 5:
- case 6:
- case 7:
- DDRB |= (1<<row);
- PORTB &= ~(1<<row);
- break;
- case 8:
- DDRF |= (1<<4);
- PORTF &= ~(1<<4);
- break;
- case 9:
- case 10:
- case 11:
- DDRF |= (1<<(row-4));
- PORTF &= ~(1<<(row-4));
- break;
- }
- }
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