Add basic Makefile targeting Digispark

Assumes the existence of a main.c containing the main code, and
builds the rest of the V-USB code with it.

diff --git a/Makefile b/Makefile
new file mode 100644 (file)
index 0000000..7f25592
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,43 @@
+DEVICE = attiny85
+F_CPU = 16500000
+
+CFLAGS = -Iusbdrv -Ilibs-device -I.
+AVRCC = avr-gcc -Wall -Os -DF_CPU=$(F_CPU) $(CFLAGS) -mmcu=$(DEVICE)
+
+OBJECTS = usbdrv/usbdrv.o usbdrv/usbdrvasm.o usbdrv/oddebug.o \
+       libs-device/osccalASM.o main.o
+
+all: main.hex
+
+main.elf: $(OBJECTS) usbconfig.h
+       $(AVRCC) -o main.elf $(OBJECTS)
+
+main.hex: main.elf
+       avr-objcopy -j .text -j .data -O ihex main.elf main.hex
+       avr-size main.hex
+
+clean:
+       rm -f $(OBJECTS) main.elf main.hex
+
+# Build rules to use AVRCC rather than the host CC
+
+.c.o:
+       $(AVRCC) -c $< -o $@
+
+.S.o:
+       $(AVRCC) -x assembler-with-cpp -c $< -o $@
+
+# Hard coded dependencies for the usbdrv bits; otherwise changes to
+# usbconfig.h don't result in enough bits getting recompiled.
+
+libs-device/osccalASM.o: libs-device/osccalASM.S usbdrv/usbdrv.h usbconfig.h \
+ libs-device/osccal.h usbdrv/usbportability.h
+
+usbdrv/oddebug.o: usbdrv/oddebug.c usbdrv/oddebug.h usbdrv/usbportability.h
+
+usbdrv/usbdrv.o: usbdrv/usbdrv.c usbdrv/usbdrv.h usbconfig.h \
+ libs-device/osccal.h usbdrv/usbportability.h usbdrv/oddebug.h
+
+usbdrv/usbdrvasm.o: usbdrv/usbdrvasm.S usbdrv/usbportability.h \
+ usbdrv/usbdrv.h usbconfig.h libs-device/osccal.h usbdrv/usbdrvasm165.inc \
+ usbdrv/asmcommon.inc