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Diffstat (limited to 'keyboard/hbkb/matrix.c')
| -rw-r--r-- | keyboard/hbkb/matrix.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/keyboard/hbkb/matrix.c b/keyboard/hbkb/matrix.c new file mode 100644 index 0000000000..ee32312d9a --- /dev/null +++ b/keyboard/hbkb/matrix.c @@ -0,0 +1,206 @@ +/* +Copyright 2012 Jun Wako <wakojun@gmail.com> + +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; + } +} |