logger, implementation and test

tests/Makefile

@@ -1,11 +1,14 @@
-CFLAGS=-I../cube/User/Inc
+CFLAGS=-I../cube/User/Inc -DTEST
 
-test:	ringbuffer.o test.o
+test:	ringbuffer.o logger.o test.o
 	gcc -o $@ -lcunit $^
 
 ringbuffer.o: ../cube/User/Src/ringbuffer.c
 	gcc -c -o $@ $(CFLAGS) $^
 
+logger.o: ../cube/User/Src/logger.c
+	gcc -c -o $@ $(CFLAGS) $^
+
 test.o:	test.c
 	gcc -c -o $@ $(CFLAGS) $^