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diff --git a/teensytp/Makefile b/teensytp/Makefile
new file mode 100644
index 0000000..fdb0afc
--- /dev/null
+++ b/teensytp/Makefile
@@ -0,0 +1,36 @@
+CC = $(CROSS_COMPILE)gcc
+CXX = $(CROSS_COMPILE)g++
+OBJCOPY = $(CROSS_COMPILE)objcopy
+SIZE = $(CROSS_COMPILE)size
+
+TOOLSPATH = tools
+
+TARGET = teensytas
+
+# CPPFLAGS += -DUSB_SERIAL -DLAYOUT_US_ENGLISH
+CPPFLAGS += -D__MK20DX256__ -DF_CPU=48000000
+CPPFLAGS += -DUSB_RAWHID
+CPPFLAGS += -Wall -Wno-format -g -Os
+CPPFLAGS += -mcpu=cortex-m4 -mtune=cortex-m4 -mthumb -nostdlib # -MMD
+CXXFLAGS += -std=gnu++0x -felide-constructors -fno-exceptions -fno-rtti
+LDFLAGS = -Os -Wl,--gc-sections -mcpu=cortex-m4 -mthumb -Tteensy3/mk20dx256.ld
+LDLIBS += -lm
+
+C_FILES := $(wildcard *.c)
+CT_FILES := $(wildcard teensy3/*.c)
+OBJS += $(C_FILES:.c=.o) $(CT_FILES:.c=.o)
+
+all: $(TARGET).hex
+
+$(TARGET).elf: $(OBJS) $(LDSCRIPT)
+	$(CC) $(LDFLAGS) -o "$@" $(OBJS) $(LDLIBS)
+
+%.hex: %.elf
+	$(SIZE) "$<"
+	$(OBJCOPY) -O ihex -R .eeprom "$<" "$@"
+
+clean:
+	$(RM) $(TARGET).hex $(TARGET).elf $(OBJS)
+
+up: $(TARGET).hex
+	teensy_loader_cli -mmcu=mk20dx128 -w $<