218 lines
5.6 KiB
C
218 lines
5.6 KiB
C
/*
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Copyright 2017 Balz Guenat
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based on work by Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include "wait.h"
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "timer.h"
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#include "matrix.h"
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#include "led.h"
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// Timer resolution check
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#if (1000000/TIMER_RAW_FREQ > 20)
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# error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
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#endif
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/*
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* Pin configuration for ATMega32U4
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*
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* Row: PD4-6, 7(~EN)
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* Col: PB0-2, 3(Z5 ~EN), 4(Z4 ~EN)
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* Key: PC6(pull-uped)
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* Hys: PC7
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*/
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static inline void KEY_ENABLE(void) { (PORTD &= ~(1<<7)); }
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static inline void KEY_UNABLE(void) { (PORTD |= (1<<7)); }
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static inline bool KEY_STATE(void) { return (PINC & (1<<6)); }
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static inline void KEY_HYS_ON(void) { (PORTC |= (1<<7)); }
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static inline void KEY_HYS_OFF(void) { (PORTC &= ~(1<<7)); }
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static inline void KEY_INIT(void)
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{
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/* Col */
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DDRB |= 0x1F;
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/* Key: input with pull-up */
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DDRC &= ~(1<<6);
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PORTC |= (1<<6);
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/* Hys */
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DDRC |= (1<<7);
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/* Row */
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DDRD |= 0xF0;
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KEY_UNABLE();
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KEY_HYS_OFF();
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}
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static inline void SET_ROW(uint8_t ROW)
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{
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// set row with unabling key
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PORTD = (PORTD & 0x0F) | (1<<7) | ((ROW & 0x07) << 4);
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}
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static inline void SET_COL(uint8_t COL)
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{
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// |PB3(Z5 ~EN)|PB4(Z4 ~EN)
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// --------|-----------|-----------
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// Col:0-7 |high |low
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// Col:8-F |low |high
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PORTB = (PORTB & 0xE0) | ((COL & 0x08) ? 1<<4 : 1<<3) | (COL & 0x07);
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}
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static uint32_t matrix_last_modified = 0;
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// matrix state buffer(1:on, 0:off)
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static matrix_row_t *matrix;
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static matrix_row_t *matrix_prev;
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static matrix_row_t _matrix0[MATRIX_ROWS];
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static matrix_row_t _matrix1[MATRIX_ROWS];
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__attribute__ ((weak))
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void matrix_init_kb(void) {
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matrix_init_user();
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}
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__attribute__ ((weak))
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void matrix_scan_kb(void) {
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matrix_scan_user();
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}
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__attribute__ ((weak))
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void matrix_init_user(void) {
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}
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__attribute__ ((weak))
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void matrix_scan_user(void) {
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}
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void matrix_init(void)
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{
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KEY_INIT();
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// LEDs on CapsLock and Insert
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DDRB |= (1<<5) | (1<<6);
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PORTB |= (1<<5) | (1<<6);
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
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for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
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matrix = _matrix0;
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matrix_prev = _matrix1;
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matrix_init_quantum();
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}
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uint8_t matrix_scan(void)
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{
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matrix_row_t *tmp;
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tmp = matrix_prev;
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matrix_prev = matrix;
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matrix = tmp;
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uint8_t row, col;
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for (col = 0; col < MATRIX_COLS; col++) {
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SET_COL(col);
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for (row = 0; row < MATRIX_ROWS; row++) {
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//KEY_SELECT(row, col);
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SET_ROW(row);
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_delay_us(2);
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// Not sure this is needed. This just emulates HHKB controller's behaviour.
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if (matrix_prev[row] & (1<<col)) {
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KEY_HYS_ON();
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}
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_delay_us(10);
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// NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
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// If V-USB interrupts in this section we could lose 40us or so
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// and would read invalid value from KEY_STATE.
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uint8_t last = TIMER_RAW;
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KEY_ENABLE();
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// Wait for KEY_STATE outputs its value.
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_delay_us(2);
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if (KEY_STATE()) {
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matrix[row] &= ~(1<<col);
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} else {
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matrix[row] |= (1<<col);
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}
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// Ignore if this code region execution time elapses more than 20us.
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// MEMO: 20[us] * (TIMER_RAW_FREQ / 1000000)[count per us]
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// MEMO: then change above using this rule: a/(b/c) = a*1/(b/c) = a*(c/b)
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if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
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matrix[row] = matrix_prev[row];
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}
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_delay_us(5);
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KEY_HYS_OFF();
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KEY_UNABLE();
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// NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
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// This takes 25us or more to make sure KEY_STATE returns to idle state.
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_delay_us(75);
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}
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if (matrix[row] ^ matrix_prev[row]) {
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matrix_last_modified = timer_read32();
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}
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}
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matrix_scan_quantum();
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return 1;
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row) {
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return matrix[row];
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}
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void matrix_print(void)
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{
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#if (MATRIX_COLS <= 8)
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print("r/c 01234567\n");
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#elif (MATRIX_COLS <= 16)
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print("r/c 0123456789ABCDEF\n");
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#elif (MATRIX_COLS <= 32)
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print("r/c 0123456789ABCDEF0123456789ABCDEF\n");
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#endif
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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#if (MATRIX_COLS <= 8)
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xprintf("%02X: %08b%s\n", row, bitrev(matrix_get_row(row)),
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#elif (MATRIX_COLS <= 16)
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xprintf("%02X: %016b%s\n", row, bitrev16(matrix_get_row(row)),
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#elif (MATRIX_COLS <= 32)
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xprintf("%02X: %032b%s\n", row, bitrev32(matrix_get_row(row)),
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#endif
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#ifdef MATRIX_HAS_GHOST
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matrix_has_ghost_in_row(row) ? " <ghost" : ""
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#else
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""
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#endif
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);
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}
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}
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