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/*
Copyright 2019 Alex Ong
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/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include "wait.h"
#include "util.h"
#include "matrix.h"
#include "debounce.h"
#include "quantum.h"
/* matrix state(1:on, 0:off) */
extern matrix_row_t raw_matrix[MATRIX_ROWS]; // raw values
extern matrix_row_t matrix[MATRIX_ROWS]; // debounced values
// matrix code
// super fast read_cols code.
static matrix_row_t read_cols(void) {
return (PINC & (1 << 6) ? 0 : (1UL << 0)) |
(PIND & (1 << 7) ? 0 : (1UL << 1)) |
(PINE & (1 << 6) ? 0 : (1UL << 2)) |
(PINB & (1 << 4) ? 0 : (1UL << 3)) |
(PINB & (1 << 5) ? 0 : (1UL << 4)) |
(PINB & (1 << 6) ? 0 : (1UL << 5)) |
(PINB & (1 << 2) ? 0 : (1UL << 6)) |
(PINB & (1 << 3) ? 0 : (1UL << 7)) |
(PINB & (1 << 1) ? 0 : (1UL << 8)) |
(PINF & (1 << 7) ? 0 : (1UL << 9)) |
(PINF & (1 << 6) ? 0 : (1UL << 10)) |
(PINF & (1 << 5) ? 0 : (1UL << 11)) |
(PINF & (1 << 4) ? 0 : (1UL << 12));
}
static void unselect_rows(void) {
DDRD &= ~0b00011111;
PORTD &= ~0b00011111;
}
static void select_row(uint8_t row) {
switch (row) {
case 0:
DDRD |= (1 << 3);
PORTD &= ~(1 << 3);
break;
case 1:
DDRD |= (1 << 2);
PORTD &= ~(1 << 2);
break;
case 2:
DDRD |= (1 << 1);
PORTD &= ~(1 << 1);
break;
case 3:
DDRD |= (1 << 0);
PORTD &= ~(1 << 0);
break;
case 4:
DDRD |= (1 << 4);
PORTD &= ~(1 << 4);
break;
}
}
static void init_pins(void) {
DDRC &= ~(1 << 6);
PORTC |= (1 << 6);
DDRD &= ~(1 << 7);
PORTD |= (1 << 7);
DDRE &= ~(1 << 6);
PORTE |= (1 << 6);
DDRB &= ~(1 << 4 | 1 << 5 | 1 << 6 | 1 << 2 | 1 << 3 | 1 << 1);
PORTB |= (1 << 4 | 1 << 5 | 1 << 6 | 1 << 2 | 1 << 3 | 1 << 1);
DDRF &= ~(1 << 7 | 1 << 6 | 1 << 5 | 1 << 4);
PORTF |= (1 << 7 | 1 << 6 | 1 << 5 | 1 << 4);
}
// Only need to init the pins. Debounce / raw matrix are initialized already for us.
void matrix_init_custom(void) {
// initialize key pins
init_pins();
}
// Only need to scan the result into current_matrix, and return changed.
uint8_t matrix_scan_custom(matrix_row_t current_matrix[]) {
bool changed = false;
// Set row, read cols
for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
select_row(current_row);
asm volatile("nop");
asm volatile("nop");
matrix_row_t cols = read_cols();
changed |= (current_matrix[current_row] != cols);
current_matrix[current_row] = cols;
unselect_rows();
}
return changed;
}
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