diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..89e424a9
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tinyusb"]
+	path = tinyusb
+	url = https://github.com/hathach/tinyusb.git
diff --git a/rules.mk b/rules.mk
index cc442f67..d993404a 100644
--- a/rules.mk
+++ b/rules.mk
@@ -2,7 +2,9 @@ CFLAGS += $(INCLUDES) $(DEFINES)
 
 OBJS = $(addprefix $(BUILD)/, $(notdir %/$(subst .c,.o, $(SRCS))))
 
-all: directory $(BUILD)/$(BIN).elf $(BUILD)/$(BIN).hex $(BUILD)/$(BIN).bin $(BUILD)/$(BIN).uf2 size
+SUBMODULES = tinyusb
+
+all: directory $(SUBMODULES) $(BUILD)/$(BIN).elf $(BUILD)/$(BIN).hex $(BUILD)/$(BIN).bin $(BUILD)/$(BIN).uf2 size
 
 $(BUILD)/$(BIN).elf: $(OBJS)
 	@echo LD $@
@@ -20,6 +22,9 @@ $(BUILD)/$(BIN).uf2: $(BUILD)/$(BIN).bin
 	@echo UF2CONV $@
 	@$(UF2) $^ -co $@
 
+$(SUBMODULES):
+	git submodule update --init --recursive
+
 install:
 	@$(UF2) -D $(BUILD)/$(BIN).uf2
 
diff --git a/tinyusb b/tinyusb
new file mode 160000
index 00000000..f8288be0
--- /dev/null
+++ b/tinyusb
@@ -0,0 +1 @@
+Subproject commit f8288be03f28ad7b944e6925f49422dfa39202c5