Added basic HID intervace

Makefile

@@ -13,34 +13,52 @@ clean:
 	-rm -r $(BUILD_DIR)
 	@echo ""
 
-.PHONY: clean all run
+
+libs: $(BUILD_DIR)/hid.o
+
+.PHONY: clean all run libs
 
 #################################################
 # Flags and autodetection
 
 # -MMD and -MP generate makefiles with extension .d.
-CPPFLAGS := -Wall -MMD -MP -I src
-LDFLAGS := -l fftw3
+CPPFLAGS := -Wall -MMD -MP -I src -I libs/hidapi/hidapi
+LDFLAGS := -l fftw3 -l udev
 
 # Find all cpp files in source dirs
 SRCS := $(shell find $(SRC_DIRS) -name '*.cpp')
 # Turns ./build/a.cpp into ./build/a.cpp.o
 OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
+LIB_OBJS := $(BUILD_DIR)/hid.o
 # Turns ./build/a.cpp.o into ./build/a.cpp.d
 DEPS := $(OBJS:.o=.d)
 
 #################################################
 # Build targets
 
+HIDAPI_PATH := libs/hidapi
+# Build hidapi
+$(BUILD_DIR)/hid.o:
+	@mkdir -p $(BUILD_DIR)
+
+	@echo "Compiling hid.o"
+	@gcc -Wall -g -fpic -c \
+		-I $(HIDAPI_PATH)/hidapi \
+		`pkg-config libusb-1.0 --cflags` \
+		\
+		$(HIDAPI_PATH)/linux/hid.c \
+		-o $(BUILD_DIR)/hid.o
+
 # C++ build step
-$(BUILD_DIR)/%.cpp.o: %.cpp
+$(BUILD_DIR)/%.cpp.o: %.cpp $(BUILD_DIR)/hid.o
 	mkdir -p $(dir $@)
 	g++ $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
 
 
 # Final build step
 $(TARGET_EXEC) : $(OBJS)
-	g++ $(OBJS) -o $@ $(LDFLAGS)
+	g++ $(OBJS) $(LIB_OBJS) -o $@ $(LDFLAGS)
+
 
 
 # Include generated makefiles