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diff --git a/keyboards/handwired/xealousbrown/matrix.c b/keyboards/handwired/xealousbrown/matrix.c
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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;
+}