diff options
author | tmk <nobody@nowhere> | 2012-06-11 10:53:02 +0900 |
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committer | tmk <nobody@nowhere> | 2012-06-11 10:53:02 +0900 |
commit | 62d1ebb91c7b381ce3d88aad9ee0b03bea9fce26 (patch) | |
tree | 6b10864a310f611187e1b61102da7da1db1d2e29 /keyboard/hhkb/matrix.c | |
parent | 225de7a847a511d004bf909b1334e19497cf2f9d (diff) | |
parent | 81706d1130fdc3c0d6d110f4d8665c47ffd7fb59 (diff) |
Merge branch 'newdir'
Diffstat (limited to 'keyboard/hhkb/matrix.c')
-rw-r--r-- | keyboard/hhkb/matrix.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/keyboard/hhkb/matrix.c b/keyboard/hhkb/matrix.c new file mode 100644 index 0000000000..350066b904 --- /dev/null +++ b/keyboard/hhkb/matrix.c @@ -0,0 +1,294 @@ +/* +Copyright 2011 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/>. +*/ + +/* + * scan matrix + */ +#include <stdint.h> +#include <stdbool.h> +#include <avr/io.h> +#include <avr/interrupt.h> +#include <util/delay.h> +#include "print.h" +#include "util.h" +#include "timer.h" +#include "matrix.h" + + +// Timer resolution check +#if (1000000/TIMER_RAW_FREQ > 20) +# error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB." +#endif + +#if (MATRIX_COLS > 16) +# error "MATRIX_COLS must not exceed 16" +#endif +#if (MATRIX_ROWS > 255) +# error "MATRIX_ROWS must not exceed 255" +#endif + + +// matrix state buffer(1:on, 0:off) +#if (MATRIX_COLS <= 8) +static uint8_t *matrix; +static uint8_t *matrix_prev; +static uint8_t _matrix0[MATRIX_ROWS]; +static uint8_t _matrix1[MATRIX_ROWS]; +#else +static uint16_t *matrix; +static uint16_t *matrix_prev; +static uint16_t _matrix0[MATRIX_ROWS]; +static uint16_t _matrix1[MATRIX_ROWS]; +#endif + +// HHKB has no ghost and no bounce. +#ifdef MATRIX_HAS_GHOST +static bool matrix_has_ghost_in_row(uint8_t row); +#endif + + +// Matrix I/O ports +// +// row: HC4051[A,B,C] selects scan row0-7 +// col: LS145[A,B,C,D] selects scan col0-7 and enable(D) +// key: on: 0/off: 1 +// prev: unknown: output previous key state(negated)? + +#ifdef HOST_PJRC +// Ports for Teensy +// row: PB0-2 +// col: PB3-5,6 +// key: PE6(pull-uped) +// prev: PE7 +#define KEY_INIT() do { \ + DDRB |= 0x7F; \ + DDRE |= (1<<7); \ + DDRE &= ~(1<<6); \ + PORTE |= (1<<6); \ +} while (0) +#define KEY_SELECT(ROW, COL) (PORTB = (PORTB & 0xC0) | \ + (((COL) & 0x07)<<3) | \ + ((ROW) & 0x07)) +#define KEY_ENABLE() (PORTB &= ~(1<<6)) +#define KEY_UNABLE() (PORTB |= (1<<6)) +#define KEY_STATE() (PINE & (1<<6)) +#define KEY_PREV_ON() (PORTE |= (1<<7)) +#define KEY_PREV_OFF() (PORTE &= ~(1<<7)) +#define KEY_POWER_ON() +#define KEY_POWER_OFF() +#else +// Ports for V-USB +// key: PB0(pull-uped) +// prev: PB1 +// row: PB2-4 +// col: PC0-2,3 +// power: PB5(Low:on/Hi-z:off) +#define KEY_INIT() do { \ + DDRB |= 0x3E; \ + DDRB &= ~(1<<0); \ + PORTB |= 1<<0; \ + DDRC |= 0x0F; \ + KEY_UNABLE(); \ + KEY_PREV_OFF(); \ +} while (0) +#define KEY_SELECT(ROW, COL) do { \ + PORTB = (PORTB & 0xE3) | ((ROW) & 0x07)<<2; \ + PORTC = (PORTC & 0xF8) | ((COL) & 0x07); \ +} while (0) +#define KEY_ENABLE() (PORTC &= ~(1<<3)) +#define KEY_UNABLE() (PORTC |= (1<<3)) +#define KEY_STATE() (PINB & (1<<0)) +#define KEY_PREV_ON() (PORTB |= (1<<1)) +#define KEY_PREV_OFF() (PORTB &= ~(1<<1)) +// Power supply switching +#define KEY_POWER_ON() do { \ + KEY_INIT(); \ + PORTB &= ~(1<<5); \ + _delay_us(200); \ +} while (0) +#define KEY_POWER_OFF() do { \ + DDRB &= ~0x3F; \ + PORTB &= ~0x3F; \ + DDRC &= ~0x0F; \ + PORTC &= ~0x0F; \ +} while (0) +#endif + + +inline +uint8_t matrix_rows(void) +{ + return MATRIX_ROWS; +} + +inline +uint8_t matrix_cols(void) +{ + return MATRIX_COLS; +} + +void matrix_init(void) +{ + KEY_INIT(); + + // initialize matrix state: all keys off + for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00; + for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00; + matrix = _matrix0; + matrix_prev = _matrix1; +} + +uint8_t matrix_scan(void) +{ + uint8_t *tmp; + + tmp = matrix_prev; + matrix_prev = matrix; + matrix = tmp; + + KEY_POWER_ON(); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + for (uint8_t col = 0; col < MATRIX_COLS; col++) { + KEY_SELECT(row, col); + _delay_us(40); + + // Not sure this is needed. This just emulates HHKB controller's behaviour. + if (matrix_prev[row] & (1<<col)) { + KEY_PREV_ON(); + } + _delay_us(7); + + // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE. + // If V-USB interrupts in this section we could lose 40us or so + // and would read invalid value from KEY_STATE. + uint8_t last = TIMER_RAW; + + KEY_ENABLE(); + // Wait for KEY_STATE outputs its value. + // 1us was ok on one HHKB, but not worked on another. + _delay_us(10); + if (KEY_STATE()) { + matrix[row] &= ~(1<<col); + } else { + matrix[row] |= (1<<col); + } + + // Ignore if this code region execution time elapses more than 20us. + if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) { + matrix[row] = matrix_prev[row]; + } + + KEY_PREV_OFF(); + KEY_UNABLE(); + // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE. + // This takes 25us or more to make sure KEY_STATE returns to idle state. + _delay_us(150); + } + } + KEY_POWER_OFF(); + return 1; +} + +bool matrix_is_modified(void) +{ + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + if (matrix[i] != matrix_prev[i]) + return true; + } + return false; +} + +inline +bool matrix_has_ghost(void) +{ +#ifdef MATRIX_HAS_GHOST + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + if (matrix_has_ghost_in_row(i)) + return true; + } +#endif + return false; +} + +inline +bool matrix_is_on(uint8_t row, uint8_t col) +{ + return (matrix[row] & (1<<col)); +} + +inline +#if (MATRIX_COLS <= 8) +uint8_t matrix_get_row(uint8_t row) +#else +uint16_t matrix_get_row(uint8_t row) +#endif +{ + return matrix[row]; +} + +void matrix_print(void) +{ +#if (MATRIX_COLS <= 8) + print("\nr/c 01234567\n"); +#else + print("\nr/c 0123456789ABCDEF\n"); +#endif + for (uint8_t row = 0; row < matrix_rows(); row++) { + phex(row); print(": "); +#if (MATRIX_COLS <= 8) + pbin_reverse(matrix_get_row(row)); +#else + pbin_reverse16(matrix_get_row(row)); +#endif +#ifdef MATRIX_HAS_GHOST + if (matrix_has_ghost_in_row(row)) { + print(" <ghost"); + } +#endif + print("\n"); + } +} + +uint8_t matrix_key_count(void) +{ + uint8_t count = 0; + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { +#if (MATRIX_COLS <= 8) + count += bitpop(matrix[i]); +#else + count += bitpop16(matrix[i]); +#endif + } + return count; +} + +#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]) == matrix[row]) + return true; + } + return false; +} +#endif |