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diff --git a/keyboards/mschwingen/modelm/matrix.c b/keyboards/mschwingen/modelm/matrix.c
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+/*
+ * Copyright 2020 Michael Schwingen
+
+ * 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 "util.h"
+#include "matrix.h"
+#include "debounce.h"
+#include "quantum.h"
+#include "spi_master.h"
+#include "print.h"
+#include "modelm.h"
+
+#define DEBUG 0
+
+#define SPI_TIMEOUT 100
+
+/* Keyboard Matrix Assignments */
+static uint16_t row_bits[MATRIX_ROWS] = {
+ 0x4000, 0x8000, 0x2000, 0x1000, 0x0800, 0x0400, 0x0100, 0x0200,
+ 0x0040, 0x0080, 0x0020, 0x0010, 0x0008, 0x0004, 0x0001, 0x0002};
+
+static const pin_t col_pins[MATRIX_COLS] = {D1, D4, D7, B4, F7, F6, F5, F4};
+
+static void select_col(uint8_t col) {
+ setPinOutput(col_pins[col]);
+ writePinLow(col_pins[col]);
+}
+
+static void unselect_col(uint8_t col) { setPinInputHigh(col_pins[col]); }
+
+static void unselect_cols(void) {
+ for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+ setPinInputHigh(col_pins[x]);
+ }
+}
+
+static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
+ uint16_t row_data;
+ bool matrix_changed = false;
+
+ // Select col and wait for col selecton to stabilize
+ select_col(current_col);
+ matrix_io_delay();
+
+ writePinLow(SR_LOAD_PIN);
+ writePinHigh(SR_LOAD_PIN);
+
+ row_data = spi_read() << 8;
+ row_data |= spi_read();
+
+#if DEBUG
+ phex(~row_data);
+ uprint(" ");
+#endif
+ // For each row...
+ for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
+ // Store last value of row prior to reading
+ matrix_row_t last_row_value = current_matrix[row_index];
+ matrix_row_t current_row_value = last_row_value;
+
+ // Check row pin state
+ if ((row_data & row_bits[row_index]) == 0) {
+ // Pin LO, set col bit
+ current_row_value |= (MATRIX_ROW_SHIFTER << current_col);
+ } else {
+ // Pin HI, clear col bit
+ current_row_value &= ~(MATRIX_ROW_SHIFTER << current_col);
+ }
+
+ // Determine if the matrix changed state
+ if ((last_row_value != current_row_value)) {
+ matrix_changed = true;
+ current_matrix[row_index] = current_row_value;
+ }
+ }
+
+ // Unselect col
+ unselect_col(current_col);
+
+ return matrix_changed;
+}
+
+void matrix_init_custom(void) {
+ unselect_cols();
+
+ // set 4MHz SPI clock
+ SPSR = 0;
+ SPCR = _BV(SPE) | _BV(MSTR) | _BV(CPOL);
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+ bool changed = false;
+
+#if DEBUG
+ uprint("\r\nScan: ");
+#endif
+ // Set col, read rows
+ for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
+ changed |= read_rows_on_col(current_matrix, current_col);
+ }
+ update_layer_leds();
+ return changed;
+}