gcc example, improved readme

Makefile

@@ -49,5 +49,6 @@ clean:
 	$(Q)$(RM) $(JUNK)
 	$(Q)cd source && $(RM) $(JUNK)
 	$(Q)cd lib && $(RM) $(JUNK)
+	$(Q)cd example && $(RM) $(JUNK)
 
 .PHONY: clean all lib

README.md

@@ -20,7 +20,11 @@ Built-in commands can be overriden in user command array.
 
 ## How to use
 
-See main.c for example of how to use the library.
+To test it with regular gcc, run the Makefile in the `example` directory.
+
+The main Makefile builds a library for ARM Cortex M4 (can be easily adjusted for others).
+
+### Stubs to implement
 
 Here's an overview of stubs you have to implement (at the time of writing this readme):
 

example/Makefile

@@ -0,0 +1,30 @@
+SRC   = example.c
+SRC  += ../source/scpi_parser.c
+SRC  += ../source/scpi_regs.c
+SRC  += ../source/scpi_builtins.c
+SRC  += ../source/scpi_errors.c
+
+INCL_DIR  = ../include
+
+CFLAGS       = -std=gnu99
+CFLAGS      += -Wall -Wextra -Wshadow
+CFLAGS      += -Wwrite-strings -Wold-style-definition -Winline
+CFLAGS      += -Wredundant-decls -Wfloat-equal -Wsign-compare -Wunused-function
+
+CC = gcc
+
+%.o: %.c
+	
+
+all: example.elf
+
+example.elf: $(SRC)
+	$(Q)$(CC) $(CFLAGS) -I$(INCL_DIR) -o example.elf $(SRC)
+
+run: example.elf
+	./example.elf
+
+clean:
+	rm -f *.o *.d *.so *.elf *.bin *.hex
+	cd ../source
+	rm -f *.o *.d *.so *.elf *.bin *.hex