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/*
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 "wait.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_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
);
}
}
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