[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>

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