Add AVR code

AVR/source/firmware/LICENSE

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+MIT License
+
+Copyright (c) 2018 @progmem, @wchill
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

AVR/source/firmware/Makefile

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+#
+#             LUFA Library
+#     Copyright (C) Dean Camera, 2014.
+#
+#  dean [at] fourwalledcubicle [dot] com
+#           www.lufa-lib.org
+#
+# --------------------------------------
+#         LUFA Project Makefile.
+# --------------------------------------
+
+# Run "make help" for target help.
+
+# Set the MCU accordingly to your device (e.g. at90usb1286 for a Teensy 2.0++, or atmega16u2 for an Arduino UNO R3)
+MCU          = atmega32u4
+ARCH         = AVR8
+F_CPU        = 16000000
+F_USB        = $(F_CPU)
+OPTIMIZATION = s
+INCLUDE_DIR  = include
+TARGET       = Joystick
+SRC_DIR      = src
+SRC          = $(SRC_DIR)/Joystick.c $(LUFA_SRC_USB)
+LUFA_PATH    = lufa/LUFA
+CC_FLAGS     = -DUSE_LUFA_CONFIG_HEADER -Iinclude/
+LD_FLAGS     =
+
+EMULATOR_TARGET		= emulator
+EMULATOR_CC      	= gcc
+EMULATOR_CC_FLAGS   = -Iinclude/ -DMOCK_AVR
+EMULATOR_OBJ_DIR 	= emulator_obj
+EMULATOR_SRC_FILES := $(wildcard $(SRC_DIR)/*.c)
+EMULATOR_OBJ_FILES := $(patsubst $(SRC_DIR)/%.c,$(EMULATOR_OBJ_DIR)/%.o,$(EMULATOR_SRC_FILES))
+
+# Default target
+all: $(EMULATOR_TARGET)
+# Include LUFA build script makefiles
+include $(LUFA_PATH)/Build/lufa_core.mk
+include $(LUFA_PATH)/Build/lufa_sources.mk
+include $(LUFA_PATH)/Build/lufa_build.mk
+include $(LUFA_PATH)/Build/lufa_cppcheck.mk
+include $(LUFA_PATH)/Build/lufa_doxygen.mk
+include $(LUFA_PATH)/Build/lufa_dfu.mk
+include $(LUFA_PATH)/Build/lufa_hid.mk
+include $(LUFA_PATH)/Build/lufa_avrdude.mk
+include $(LUFA_PATH)/Build/lufa_atprogram.mk
+
+# Target for LED/buzzer to alert when print is done
+with-alert: all
+with-alert: CC_FLAGS += -DALERT_WHEN_DONE
+
+flash: all
+	sudo dfu-programmer $(MCU) erase
+	sudo dfu-programmer $(MCU) flash $(TARGET).hex
+	sudo dfu-programmer $(MCU) reset
+
+$(EMULATOR_TARGET): $(EMULATOR_OBJ_FILES)
+	$(EMULATOR_CC) -o $@ $^
+
+$(EMULATOR_OBJ_DIR)/%.o: $(SRC_DIR)/%.c
+	mkdir -p $(EMULATOR_OBJ_DIR)
+	$(EMULATOR_CC) $(EMULATOR_CC_FLAGS) -c -o $@ $<
+
+clean-emu:
+	rm -rf $(EMULATOR_OBJ_DIR) $(EMULATOR_TARGET)
+
+run-emu:
+	socat -d -d PTY,link=/tmp/faketty0,raw,echo=0 EXEC:./$(EMULATOR_TARGET)

AVR/source/firmware/README.md

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+[LUFA Version Used: 170418](http://www.fourwalledcubicle.com/LUFA.php) 
+
+Directory structure:
+
+- source/firmware/lufa/LUFA/
+    - Build
+    - CodeTemplates
+    - ...

AVR/source/firmware/include/.directory

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+[Dolphin]
+Timestamp=2020,6,25,3,3,21
+Version=4
+ViewMode=1
+VisibleRoles=Details_text,Details_modificationtime,Details_size,CustomizedDetails