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