[Keyboard] add support for ModelM USB board (#9846)

* add support for ModelM USB board

* EMI improvement: remove unnecessary toggling of MOSI pin

* address review comments

* Update keyboards/mschwingen/modelm/rules.mk

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/mschwingen/modelm/rules.mk

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/mschwingen/modelm/config.h

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/mschwingen/modelm/config.h

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Update keyboards/mschwingen/modelm/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/mschwingen/modelm/keymaps/default/keymap.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

* update printf usage

* add comment

* EMI improvement: remove unnecessary toggling of MOSI signal

* remove trailing space

* use shorter macros as suggested in review by noroadsleft, re-format table to line up columns

* Update keyboards/mschwingen/modelm/config.h

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/mschwingen/modelm/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/mschwingen/modelm/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/mschwingen/modelm/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/mschwingen/modelm/README.md

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/mschwingen/modelm/README.md

Co-authored-by: Ryan <fauxpark@gmail.com>

* Apply suggestions from code review

use spi_read from core insteads of our own copy

Co-authored-by: Ryan <fauxpark@gmail.com>

* include spi_master.c to use spi_read()

* Update keyboards/mschwingen/modelm/README.md

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Apply suggestions from code review: correct indenting in keymap

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Apply suggestions from code review

use automatic variant defines from makefile instead of defining our own

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/mschwingen/modelm/rules.mk: use QUANTUM_LIB_SRC for uart.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

Co-authored-by: Michael Schwingen <michael@schwingen.org>
Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

10 files changed, 638 insertions, 0 deletions

diff --git a/keyboards/mschwingen/modelm/README.md b/keyboards/mschwingen/modelm/README.md
new file mode 100644
index 000000000..f4cb36062
--- /dev/null
+++ b/keyboards/mschwingen/modelm/README.md
@@ -0,0 +1,25 @@
+# atmega32U4 board for IBM Model M
+
+![modelm](https://raw.githubusercontent.com/mschwingen/hardware/master/modelm-usb/images/PCB.jpg)
+
+This is a configuration of QMK intended to be used with the [Model M USB PCB](https://github.com/mschwingen/hardware/tree/master/modelm-usb).
+
+* Keyboard Maintainer: [Michael Schwingen](https://github.com/mschwingen/)
+* Hardware Supported: [Model M USB PCB](https://github.com/mschwingen/hardware/tree/master/modelm-usb)
+* Hardware Availability: need to build your own.
+
+Make example for this keyboard (after setting up your build environment), run one of:
+
+    make mschwingen/modelm/led_wired:default
+    make mschwingen/modelm/led_ffc:default
+    make mschwingen/modelm/led_ws2812:default
+
+flash:
+
+    make mschwingen/modelm/led_wired:default:flash
+    make mschwingen/modelm/led_ffc:default:flash
+    make mschwingen/modelm/led_ws2812:default:flash
+
+Bootloader: do not use the QMK bootloader, use the bootloader from [here](https://github.com/mschwingen/modelm-lufa-bootloader)
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/mschwingen/modelm/config.h b/keyboards/mschwingen/modelm/config.h
new file mode 100644
index 000000000..07881cd21
--- /dev/null
+++ b/keyboards/mschwingen/modelm/config.h
@@ -0,0 +1,91 @@
+/*
+ * 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/>.
+ */
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x558E
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    mschwingen
+#define PRODUCT         IBM Model M 101/102
+
+/* key matrix size */
+#define MATRIX_ROWS 16
+#define MATRIX_COLS 8
+
+/* pins for external shift registers */
+#define SR_LOAD_PIN B0
+#define SR_CLK_PIN B1
+#define SR_DIN_PIN B3
+#define SR_DOUT_PIN B2
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed (5 is default) */
+#define DEBOUNCE 5
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+#define NORMAL_PRINT
+//#define USER_PRINT
+
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+//#define NO_ACTION_MACRO
+//#define NO_ACTION_FUNCTION
+
+//#define DEBUG_MATRIX_SCAN_RATE
+#define DYNAMIC_MACRO_NO_NESTING
+
+#define QMK_LED E6
+
+#define MODELM_LED1 B5
+#define MODELM_LED2 B6
+#define MODELM_LED3 D0
+
+#if defined(KEYBOARD_mschwingen_modelm_led_wired)
+# define MODELM_LED_CAPSLOCK  MODELM_LED1
+# define MODELM_LED_SCROLLOCK MODELM_LED2
+# define MODELM_LED_NUMLOCK   MODELM_LED3
+#elif defined(KEYBOARD_mschwingen_modelm_led_ffc)
+# define MODELM_LED_CAPSLOCK  MODELM_LED2
+# define MODELM_LED_SCROLLOCK MODELM_LED3
+# define MODELM_LED_NUMLOCK   MODELM_LED1
+#elif defined(KEYBOARD_mschwingen_modelm_led_ws2812)
+#else
+# error one of MODELM_LEDS_FFC, MODELM_LEDS_WIRED or MODELM_LEDS_WS2812 must be set!
+#endif
+
+// 3* WS2812 LEDs instead of singlecolor GPIO LEDs
+#define RGB_DI_PIN B6
+#define RGBLED_NUM 3
+
+// disabled, needs PCB patch.
+//#define C6_AUDIO
+//#define NO_MUSIC_MODE
diff --git a/keyboards/mschwingen/modelm/keymaps/default/keymap.c b/keyboards/mschwingen/modelm/keymaps/default/keymap.c
new file mode 100644
index 000000000..7f43746db
--- /dev/null
+++ b/keyboards/mschwingen/modelm/keymaps/default/keymap.c
@@ -0,0 +1,86 @@
+/* Copyright 2019 ashpil
+ *
+ * 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 QMK_KEYBOARD_H
+
+enum layers {
+    _BL0,
+    _BL1,
+    _FL,
+    _MS
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_BL0] = LAYOUT( /* Base layer - Windows key instead of CapsLock, hold ESC for special functions */
+    LT(_FL,KC_ESC),   KC_F1  , KC_F2  , KC_F3  , KC_F4  , KC_F5  , KC_F6  , KC_F7  , KC_F8  , KC_F9  , KC_F10,  KC_F11 , KC_F12 , KC_PSCR, KC_SLCK, KC_PAUS,
+    KC_GRV , KC_1,    KC_2   , KC_3   , KC_4   , KC_5   , KC_6   , KC_7   , KC_8   , KC_9   , KC_0   , KC_MINS, KC_EQL , KC_BSPC, KC_INS , KC_HOME, KC_PGUP, KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
+    KC_TAB , KC_Q,    KC_W   , KC_E   , KC_R   , KC_T   , KC_Y   , KC_U   , KC_I   , KC_O   , KC_P   , KC_LBRC, KC_RBRC, KC_BSLS, KC_DEL , KC_END , KC_PGDN, KC_P7,   KC_P8  , KC_P9  , KC_PPLS,
+    KC_LWIN, KC_A,    KC_S   , KC_D   , KC_F   , KC_G   , KC_H   , KC_J   , KC_K   , KC_L   , KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT ,                            KC_P4,   KC_P5  , KC_P6  ,
+    KC_LSFT, KC_NUBS, KC_Z   , KC_X   , KC_C   , KC_V   , KC_B   , KC_N   , KC_M   , KC_COMM, KC_DOT , KC_SLSH,          KC_RSFT,          KC_UP  ,          KC_P1,   KC_P2  , KC_P3  , KC_PENT,
+    KC_LCTL,          KC_LALT,                            KC_SPC ,                                     KC_RALT,          KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT, KC_P0,            KC_PDOT
+  ),
+
+  [_BL1] = LAYOUT( /* Base layer - standard layout without any special functions */
+    KC_ESC ,          KC_F1  , KC_F2  , KC_F3  , KC_F4  , KC_F5  , KC_F6  , KC_F7  , KC_F8  , KC_F9  , KC_F10 , KC_F11 , KC_F12 , KC_PSCR, KC_SLCK, KC_PAUS,
+    KC_GRV , KC_1   , KC_2   , KC_3   , KC_4   , KC_5   , KC_6   , KC_7   , KC_8   , KC_9   , KC_0   , KC_MINS, KC_EQL , KC_BSPC, KC_INS , KC_HOME, KC_PGUP, KC_NLCK, KC_PSLS, KC_PAST, KC_PMNS,
+    KC_TAB , KC_Q   , KC_W   , KC_E   , KC_R   , KC_T   , KC_Y   , KC_U   , KC_I   , KC_O   , KC_P   , KC_LBRC, KC_RBRC, KC_BSLS, KC_DEL , KC_END , KC_PGDN, KC_P7,   KC_P8  , KC_P9  , KC_PPLS,
+    KC_CAPS, KC_A   , KC_S   , KC_D   , KC_F   , KC_G   , KC_H   , KC_J   , KC_K   , KC_L   , KC_SCLN, KC_QUOT, KC_NUHS, KC_ENT ,                            KC_P4,   KC_P5  , KC_P6  ,
+    KC_LSFT, KC_NUBS, KC_Z   , KC_X   , KC_C   , KC_V   , KC_B   , KC_N   , KC_M   , KC_COMM, KC_DOT , KC_SLSH,          KC_RSFT,          KC_UP  ,          KC_P1,   KC_P2  , KC_P3  , KC_PENT,
+    KC_LCTL,          KC_LALT,                            KC_SPC ,                                     KC_RALT,          KC_RCTL, KC_LEFT, KC_DOWN, KC_RGHT, KC_P0,            KC_PDOT
+  ),
+
+  [_FL] = LAYOUT( /* special functions layer */
+    // F1: dyn. macro 1 play
+    // F2: dyn. macro 2 play
+    // F3: dyn. macro 1 record
+    // F4: dyn. macro 2 record
+    // F5: dyn. macro record stop
+    // Capslock: CapsLock (really!)
+    // ~: Key Lock
+    // Cursor: Media Pref / Next / Volume Up / Volume Down
+    // Space:  Media Play / Pause
+    // m: enter mouse layer
+    _______,          DM_PLY1, DM_PLY2, DM_REC1, DM_REC2, DM_RSTP, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    KC_LOCK, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    KC_CAPS, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,                            _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, TG(_MS), _______, _______, _______,          _______,          KC_VOLU,          _______, _______, _______, _______,
+    _______,          _______,                            KC_MPLY,                                     _______,          _______, KC_MPRV, KC_VOLD, KC_MNXT, _______,          _______
+  ),
+
+  [_MS] = LAYOUT( /* mouse key layer */
+  // Cursor: mouse, INS/HOME/PgUp: Mouse Accel, Del, End, PageDn: mouse buttons
+    TG(_MS),          _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_ACL0, KC_ACL1, KC_ACL2, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_BTN1, KC_BTN3, KC_BTN2, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,                            _______, _______, _______,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______,          KC_MS_U,          _______, _______, _______, _______,
+    _______,          _______,                            _______,                                     _______,          _______, KC_MS_L, KC_MS_D, KC_MS_R, _______,          _______
+  )
+};
+
+void keyboard_post_init_user(void) {
+  // Customise these values to desired behaviour
+  //debug_enable=true;
+  //debug_matrix=true;
+  //debug_keyboard=true;
+  //debug_mouse=true;
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  // If console is enabled, it will print the matrix position and status of each key pressed
+    dprintf("KL: kc: %u, col: %u, row: %u, pressed: %u\n", keycode, record->event.key.col, record->event.key.row, record->event.pressed);
+    return true;
+}
diff --git a/keyboards/mschwingen/modelm/led_ffc/rules.mk b/keyboards/mschwingen/modelm/led_ffc/rules.mk
new file mode 100644
index 000000000..8b1378917
--- /dev/null
+++ b/keyboards/mschwingen/modelm/led_ffc/rules.mk
@@ -0,0 +1 @@
+
diff --git a/keyboards/mschwingen/modelm/led_wired/rules.mk b/keyboards/mschwingen/modelm/led_wired/rules.mk
new file mode 100644
index 000000000..8b1378917
--- /dev/null
+++ b/keyboards/mschwingen/modelm/led_wired/rules.mk
@@ -0,0 +1 @@
+
diff --git a/keyboards/mschwingen/modelm/led_ws2812/rules.mk b/keyboards/mschwingen/modelm/led_ws2812/rules.mk
new file mode 100644
index 000000000..424388fd8
--- /dev/null
+++ b/keyboards/mschwingen/modelm/led_ws2812/rules.mk
@@ -0,0 +1,2 @@
+# variant for WS2812 LEDs
+SRC += ws2812.c
diff --git a/keyboards/mschwingen/modelm/matrix.c b/keyboards/mschwingen/modelm/matrix.c
new file mode 100644
index 000000000..ef725a61e
--- /dev/null
+++ b/keyboards/mschwingen/modelm/matrix.c
@@ -0,0 +1,117 @@
+/*
+ * 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;
+}
diff --git a/keyboards/mschwingen/modelm/modelm.c b/keyboards/mschwingen/modelm/modelm.c
new file mode 100644
index 000000000..5756a9517
--- /dev/null
+++ b/keyboards/mschwingen/modelm/modelm.c
@@ -0,0 +1,214 @@
+/*
+ * 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 <util/delay.h>
+#include "modelm.h"
+#include "uart.h"
+#include "print.h"
+#include "sendchar.h"
+#include "ws2812.h"
+#include "modelm.h"
+#include "sleep_led.h"
+
+#ifdef UART_DEBUG
+#    undef sendchar
+static int8_t capture_sendchar(uint8_t c) {
+    //  sendchar(c);
+    uart_putchar(c);
+    return 0;
+}
+#endif
+
+static uint16_t blink_cycle_timer;
+static bool     blink_state = false;
+static uint8_t  isRecording = 0;
+
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+#    if RGBLED_NUM < 3
+#        error we need at least 3 RGB LEDs!
+#    endif
+static cRGB led[RGBLED_NUM] = {{255, 255, 255}, {255, 255, 255}, {255, 255, 255}};
+
+#    define BRIGHT 32
+#    define DIM 6
+
+static const cRGB black = {.r = 0, .g = 0, .b = 0};
+
+static const cRGB green  = {.r = 0, .g = BRIGHT, .b = 0};
+static const cRGB lgreen = {.r = 0, .g = DIM, .b = 0};
+
+static const cRGB red  = {.r = BRIGHT, .g = 0, .b = 0};
+static const cRGB lred = {.r = DIM, .g = 0, .b = 0};
+
+static const cRGB blue  = {.r = 0, .g = 0, .b = BRIGHT};
+static const cRGB lblue = {.r = 0, .g = 0, .b = DIM};
+
+static const cRGB turq  = {.r = 0, .g = BRIGHT, .b = BRIGHT};
+static const cRGB lturq = {.r = 0, .g = DIM, .b = DIM};
+
+static const cRGB white = {.r = BRIGHT, .g = BRIGHT, .b = BRIGHT};
+
+static led_t   led_state;
+static uint8_t layer;
+static uint8_t default_layer;
+#endif
+
+// we need our own sleep_led_* implementation to get callbacks on USB
+// suspend/resume in order to completely turn off WS2812 LEDs
+static bool suspend_active = false;
+void sleep_led_init(void) {}
+
+void sleep_led_toggle(void) {}
+
+void sleep_led_disable(void) {
+    suspend_active = false;
+    writePinHigh(QMK_LED);
+}
+
+void sleep_led_enable(void) {
+    suspend_active = true;
+    writePinLow(QMK_LED);
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+    led[0] = black;
+    led[1] = black;
+    led[2] = black;
+    ws2812_setleds(led, RGBLED_NUM);
+#endif
+}
+
+void keyboard_pre_init_kb(void) {
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+    ws2812_setleds(led, RGBLED_NUM);
+#else
+    /* Set status LEDs pins to output and Low (on) */
+    setPinOutput(MODELM_LED_CAPSLOCK);
+    setPinOutput(MODELM_LED_SCROLLOCK);
+    setPinOutput(MODELM_LED_NUMLOCK);
+    writePinLow(MODELM_LED_CAPSLOCK);
+    writePinLow(MODELM_LED_SCROLLOCK);
+    writePinLow(MODELM_LED_NUMLOCK);
+#endif
+    setPinOutput(QMK_LED);
+    writePinHigh(QMK_LED);
+    _delay_ms(50);
+#ifdef UART_DEBUG
+    uart_init(115200);
+    print_set_sendchar(capture_sendchar);
+    uprintf("\r\nHello world!\r\n");
+#endif
+
+    setPinOutput(SR_LOAD_PIN);
+    setPinOutput(SR_CLK_PIN);
+    setPinOutput(SR_DOUT_PIN);  // MOSI - unused
+    writePinLow(SR_CLK_PIN);
+}
+
+#ifdef KEYBOARD_mschwingen_modelm_led_ws2812
+static void led_update_rgb(void) {
+    if (isRecording && blink_state) {
+        led[0] = white;
+    } else {
+        switch (default_layer) {
+            case 0:
+                led[0] = led_state.num_lock ? blue : lblue;
+                break;
+            case 1:
+                led[0] = led_state.num_lock ? green : black;
+                break;
+        }
+    }
+
+    led[1] = led_state.caps_lock ? green : black;
+
+    switch (layer) {
+        case 0:
+        case 1:
+        default:
+            led[2] = led_state.scroll_lock ? green : black;
+            break;
+        case 2:
+            led[2] = led_state.scroll_lock ? red : lred;
+            break;
+        case 3:
+            led[2] = led_state.scroll_lock ? turq : lturq;
+            break;
+    }
+    if (!suspend_active) {
+	ws2812_setleds(led, RGBLED_NUM);
+    }
+}
+
+bool led_update_kb(led_t state) {
+    dprintf("LED Update: %d %d %d", led_state.num_lock, led_state.caps_lock, led_state.scroll_lock);
+    led_state = state;
+    led_update_rgb();
+
+    return true;
+}
+
+void update_layer_leds(void) {
+    static uint8_t old_layer         = 255;
+    static uint8_t old_default_layer = 255;
+
+    layer         = biton32(layer_state);
+    default_layer = biton32(default_layer_state);
+
+    if (isRecording && timer_elapsed(blink_cycle_timer) > 150) {
+        blink_state       = !blink_state;
+        blink_cycle_timer = timer_read();
+        old_layer         = 255;  // fallthrough next check
+    }
+
+    if (layer == old_layer && default_layer == old_default_layer) {
+	return;
+    }
+    old_layer         = layer;
+    old_default_layer = default_layer;
+    dprintf("Layer change: %d %d", default_layer, layer);
+    led_update_rgb();
+}
+
+/*****************************************************************************/
+#else  // classic LEDs on GPIO
+bool led_update_kb(led_t led_state) {
+    dprintf("LED Update: %d %d %d", led_state.num_lock, led_state.caps_lock, led_state.scroll_lock);
+
+    if (led_update_user(led_state)) {
+        if (!isRecording) writePin(MODELM_LED_NUMLOCK, !led_state.num_lock);
+        writePin(MODELM_LED_CAPSLOCK, !led_state.caps_lock);
+        writePin(MODELM_LED_SCROLLOCK, !led_state.scroll_lock);
+    }
+    return true;
+}
+
+void update_layer_leds(void) {
+    if (isRecording && timer_elapsed(blink_cycle_timer) > 150) {
+        blink_state = !blink_state;
+        blink_cycle_timer = timer_read();
+        writePin(MODELM_LED_NUMLOCK, blink_state);
+    }
+}
+
+#endif
+
+void dynamic_macro_record_start_user(void) {
+    isRecording++;
+    blink_cycle_timer = timer_read();
+}
+
+void dynamic_macro_record_end_user(int8_t direction) {
+    if (isRecording) isRecording--;
+}
diff --git a/keyboards/mschwingen/modelm/modelm.h b/keyboards/mschwingen/modelm/modelm.h
new file mode 100644
index 000000000..04b6b6112
--- /dev/null
+++ b/keyboards/mschwingen/modelm/modelm.h
@@ -0,0 +1,58 @@
+/*
+ * 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/>.
+ */
+
+#pragma once
+
+extern void update_layer_leds(void);
+
+#include "quantum.h"
+
+/* This a shortcut to help you visually see your layout.
+ * The first section contains "names" for physical keys of the keyboard
+ * and defines their position on the board.
+ * The second section defines position of the keys on the switch matrix
+ * (where COLUMNS and ROWS crosses). */
+
+/* universla layout for both 101 and 102-key versions */
+#define LAYOUT( \
+    K5A,      K5B, K5C, K5D, K5E, K5F, K5G, K5H, K5I, K5J, K5K, K5L, K5M,   K5N, K5O, K5P, \
+    \
+    K4A, K4B, K4C, K4D, K4E, K4F, K4G, K4H, K4I, K4J, K4K, K4L, K4M, K4N,   K4O, K4P, K4Q,   K4R, K4S, K4T, K4U, \
+    K3A, K3B, K3C, K3D, K3E, K3F, K3G, K3H, K3I, K3J, K3K, K3L, K3M, K3N,   K3O, K3P, K3Q,   K3R, K3S, K3T, K3U, \
+    K2A, K2B, K2C, K2D, K2E, K2F, K2G, K2H, K2I, K2J, K2K, K2L, K2M, K2N,                    K2O, K2P, K2Q, \
+    K1A, K1B, K1C, K1D, K1E, K1F, K1G, K1H, K1I, K1J, K1K, K1L,      K1M,        K1N,        K1O, K1P, K1Q, K1R, \
+    K0A,      K0B,                K0C,                     K0D,      K0E,   K0F, K0G, K0H,   K0I,      K0J       \
+) \
+    {/* COL0    ............                           COL7 */		\
+    { K0D  , KC_NO, KC_NO, K5O  , K5N  , KC_NO, KC_NO, K0B   }, /* ROW0 */ \
+    { K0F  , K5P  , K1R  , K3U  , K3P  , K4P  , KC_NO, K1N   }, \
+    { K4U  , K4T  , K1Q  , K3T  , K3Q  , K4Q  , K2Q  , K0J   }, \
+    { K0H  , K4S  , K1P  , K3S  , K5M  , K4O  , K2P  , K0I   }, \
+    { K0G  , K4R  , K1O  , K3R  , K5L  , K3O  , K2O  , KC_NO }, \
+    { K1L  , K2M  , K2K  , K3K  , K4K  , K4L  , K3L  , K2L   }, \
+    { KC_NO, K1K  , K2J  , K3J  , K4J  , K5I  , K5H  , KC_NO }, \
+    { KC_NO, K1J  , K2I  , K3I  , K4I  , K4M  , K3M  , K5G   }, \
+    { K1H  , K1I  , K2H  , K3H  , K4H  , K4G  , K3G  , K2G   }, \
+    { K0C  , K2N  , K3N  , KC_NO, K5K  , K5J  , K4N  , K5F   }, \
+    { K1G  , K1F  , K2E  , K3E  , K4E  , K4F  , K3F  , K2F   }, \
+    { KC_NO, K1E  , K2D  , K3D  , K4D  , K5C  , K5D  , K5E   }, \
+    { KC_NO, K1D  , K2C  , K3C  , K4C  , K5B  , K2A  , K1B   }, \
+    { KC_NO, K1C  , K2B  , K3B  , K4B  , K4A  , K3A  , K5A   }, \
+    { KC_NO, K1M  , KC_NO, KC_NO, KC_NO, KC_NO, K1A  , KC_NO }, \
+    { KC_NO, K0E  , KC_NO, KC_NO, KC_NO, K0A  , KC_NO, KC_NO }, /* ROW15 */ \
+}
+
diff --git a/keyboards/mschwingen/modelm/rules.mk b/keyboards/mschwingen/modelm/rules.mk
new file mode 100644
index 000000000..f3af26eee
--- /dev/null
+++ b/keyboards/mschwingen/modelm/rules.mk
@@ -0,0 +1,43 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = lufa-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = yes        # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
+
+CUSTOM_MATRIX = lite
+KEY_LOCK_ENABLE = yes
+
+DYNAMIC_MACRO_ENABLE = yes
+
+UART_DEBUG = no
+
+SRC += matrix.c
+QUANTUM_LIB_SRC += $(COMMON_DIR)/uart.c \
+                   spi_master.c
+
+OPT_DEFS += -DSLEEP_LED_ENABLE # we need our own sleep callbacks to turn of WS2812 LEDs
+
+LTO_ENABLE = yes
+
+ifeq ($(strip $(UART_DEBUG)), yes)
+    OPT_DEFS += -DUART_DEBUG
+endif
+
+DEFAULT_FOLDER = mschwingen/modelm/led_wired