diff options
Diffstat (limited to 'keyboards/fc660c/matrix.c')
| -rw-r--r-- | keyboards/fc660c/matrix.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/keyboards/fc660c/matrix.c b/keyboards/fc660c/matrix.c new file mode 100644 index 0000000000..211506fdf3 --- /dev/null +++ b/keyboards/fc660c/matrix.c @@ -0,0 +1,226 @@ +/* +Copyright 2017 Balz Guenat +based on work by 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 "led.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 + + +/* + * Pin configuration for ATMega32U4 + * + * Row: PD4-6, 7(~EN) + * Col: PB0-2, 3(Z5 ~EN), 4(Z4 ~EN) + * Key: PC6(pull-uped) + * Hys: PC7 + */ +static inline void KEY_ENABLE(void) { (PORTD &= ~(1<<7)); } +static inline void KEY_UNABLE(void) { (PORTD |= (1<<7)); } +static inline bool KEY_STATE(void) { return (PINC & (1<<6)); } +static inline void KEY_HYS_ON(void) { (PORTC |= (1<<7)); } +static inline void KEY_HYS_OFF(void) { (PORTC &= ~(1<<7)); } +static inline void KEY_INIT(void) +{ + /* Col */ + DDRB |= 0x1F; + /* Key: input with pull-up */ + DDRC &= ~(1<<6); + PORTC |= (1<<6); + /* Hys */ + DDRC |= (1<<7); + /* Row */ + DDRD |= 0xF0; + + KEY_UNABLE(); + KEY_HYS_OFF(); +} +static inline void SET_ROW(uint8_t ROW) +{ + // set row with unabling key + PORTD = (PORTD & 0x0F) | (1<<7) | ((ROW & 0x07) << 4); +} +static inline void SET_COL(uint8_t COL) +{ + // |PB3(Z5 ~EN)|PB4(Z4 ~EN) + // --------|-----------|----------- + // Col:0-7 |high |low + // Col:8-F |low |high + PORTB = (PORTB & 0xE0) | ((COL & 0x08) ? 1<<4 : 1<<3) | (COL & 0x07); +} + +static uint32_t matrix_last_modified = 0; + +// 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]; + + +__attribute__ ((weak)) +void matrix_init_quantum(void) { + matrix_init_kb(); +} + +__attribute__ ((weak)) +void matrix_scan_quantum(void) { + matrix_scan_kb(); +} + +__attribute__ ((weak)) +void matrix_init_kb(void) { + matrix_init_user(); +} + +__attribute__ ((weak)) +void matrix_scan_kb(void) { + matrix_scan_user(); +} + +__attribute__ ((weak)) +void matrix_init_user(void) { +} + +__attribute__ ((weak)) +void matrix_scan_user(void) { +} + + +void matrix_init(void) +{ + KEY_INIT(); + + // LEDs on CapsLock and Insert + DDRB |= (1<<5) | (1<<6); + PORTB |= (1<<5) | (1<<6); + + // 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; + matrix_init_quantum(); +} + +uint8_t matrix_scan(void) +{ + matrix_row_t *tmp; + + tmp = matrix_prev; + matrix_prev = matrix; + matrix = tmp; + + uint8_t row, col; + for (col = 0; col < MATRIX_COLS; col++) { + SET_COL(col); + for (row = 0; row < MATRIX_ROWS; row++) { + //KEY_SELECT(row, col); + SET_ROW(row); + _delay_us(2); + + // Not sure this is needed. This just emulates HHKB controller's behaviour. + if (matrix_prev[row] & (1<<col)) { + KEY_HYS_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. + _delay_us(2); + + 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_HYS_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_scan_quantum(); + return 1; +} + +inline +matrix_row_t matrix_get_row(uint8_t row) { + return matrix[row]; +} + +void matrix_print(void) +{ +#if (MATRIX_COLS <= 8) + print("r/c 01234567\n"); +#elif (MATRIX_COLS <= 16) + print("r/c 0123456789ABCDEF\n"); +#elif (MATRIX_COLS <= 32) + print("r/c 0123456789ABCDEF0123456789ABCDEF\n"); +#endif + + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + +#if (MATRIX_COLS <= 8) + xprintf("%02X: %08b%s\n", row, bitrev(matrix_get_row(row)), +#elif (MATRIX_COLS <= 16) + xprintf("%02X: %016b%s\n", row, bitrev16(matrix_get_row(row)), +#elif (MATRIX_COLS <= 32) + xprintf("%02X: %032b%s\n", row, bitrev32(matrix_get_row(row)), +#endif +#ifdef MATRIX_HAS_GHOST + matrix_has_ghost_in_row(row) ? " <ghost" : "" +#else + "" +#endif + ); + } +} |