update for open source

lib/rp2040_flash/Makefile

@@ -0,0 +1,20 @@
+CC=gcc
+CFLAGS=-c -Wall -ggdb
+LDFALGS=
+SOURCES=main.c picoboot_connection.c
+OBJECTS=$(SOURCES:.c=.o)
+LIBS=`pkg-config libusb-1.0 --libs`
+INCLUDE_DIRS+=-I../rp2040/ `pkg-config libusb-1.0 --cflags`
+
+EXECUTABLE=rp2040_flash
+
+all: $(EXECUTABLE)
+
+$(EXECUTABLE): $(OBJECTS)
+	$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -o $@
+
+.c.o:
+	$(CC) $(CFLAGS) $(INCLUDE_DIRS) $< -o $@
+
+clean:
+	rm -f $(OBJECTS) $(EXECUTABLE)