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Diffstat (limited to 'keyboard/hhkb_rn42/matrix.c')
| -rw-r--r-- | keyboard/hhkb_rn42/matrix.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/keyboard/hhkb_rn42/matrix.c b/keyboard/hhkb_rn42/matrix.c new file mode 100644 index 0000000000..c6c444ff52 --- /dev/null +++ b/keyboard/hhkb_rn42/matrix.c @@ -0,0 +1,191 @@ +/* +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 <util/delay.h> +#include "print.h" +#include "debug.h" +#include "util.h" +#include "timer.h" +#include "matrix.h" +#include "hhkb_avr.h" +#include <avr/wdt.h> +#include "suspend.h" +#include "lufa.h" + + +// matrix power saving +#define MATRIX_POWER_SAVE 10000 +static uint32_t matrix_last_modified = 0; +static bool matrix_power = true; + +// matrix state buffer(1:on, 0:off) +static matrix_row_t *matrix; +static matrix_row_t *matrix_prev; +static matrix_row_t _matrix0[MATRIX_ROWS]; +static matrix_row_t _matrix1[MATRIX_ROWS]; + + +inline +uint8_t matrix_rows(void) +{ + return MATRIX_ROWS; +} + +inline +uint8_t matrix_cols(void) +{ + return MATRIX_COLS; +} + +void matrix_init(void) +{ +#ifdef DEBUG + debug_enable = true; + debug_keyboard = true; +#endif + + 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; + + matrix_power_up(); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + for (uint8_t col = 0; col < MATRIX_COLS; col++) { + KEY_SELECT(row, col); + _delay_us(5); + + // Not sure this is needed. This just emulates HHKB controller's behaviour. + if (matrix_prev[row] & (1<<col)) { + KEY_PREV_ON(); + } + _delay_us(10); + + // 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. + // no wait doesn't work on Teensy++ with pro(1us works) + // no wait does work on tmk PCB(8MHz) with pro2 + // 1us wait does work on both of above + // 1us wait doesn't work on tmk(16MHz) + // 5us wait does work on tmk(16MHz) + // 5us wait does work on tmk(16MHz/2) + // 5us wait does work on tmk(8MHz) + // 10us wait does work on Teensy++ with pro + // 10us wait does work on 328p+iwrap with pro + // 10us wait doesn't work on tmk PCB(8MHz) with pro2(very lagged scan) + _delay_us(5); + + if (KEY_STATE()) { + matrix[row] &= ~(1<<col); + } else { + matrix[row] |= (1<<col); + } + + // Ignore if this code region execution time elapses more than 20us. + // MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us] + // MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b) + if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) { + matrix[row] = matrix_prev[row]; + } + + _delay_us(5); + 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(75); + } + if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32(); + } + matrix_power_down(); + 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) +{ + return false; +} + +inline +bool matrix_is_on(uint8_t row, uint8_t col) +{ + return (matrix[row] & (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++) { + xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row))); + } +} + +void matrix_power_up(void) { + if (matrix_power) return; + KEY_POWER_ON(); + matrix_power = true; +} +void matrix_power_down(void) { + if (!matrix_power) return; + // doesn't power save while USB connection is active + if (USB_DeviceState == DEVICE_STATE_Configured) return; + if (timer_elapsed32(matrix_last_modified) <= MATRIX_POWER_SAVE) return; + KEY_POWER_OFF(); + suspend_power_down(WDTO_15MS); + matrix_power = false; +} |