initial commit, compiles for ATTINY84 with TX on PA5 and RX on PA6

Makefile

@@ -0,0 +1,22 @@
+MCU=attiny84
+CC=avr-gcc
+LD=avr-ld
+OBJCOPY=avr-objcopy
+SIZE=avr-size
+AVRDUDE=avrdude
+CFLAGS=-Wall -g -Os -mmcu=${MCU} -I. -I..
+TARGET=main
+
+SRCS=main.c suart.c
+
+all:
+	${CC} ${CFLAGS} -o ${TARGET}.o ${SRCS}
+	${LD} -o ${TARGET}.elf ${TARGET}.o
+	${OBJCOPY} -j .text -j .data -O ihex ${TARGET}.o ${TARGET}.hex
+	${SIZE} -C --mcu=${MCU} ${TARGET}.elf
+
+flash:
+	${AVRDUDE} -p ${MCU} -c usbasp -U flash:w:${TARGET}.hex:i -F -P usb
+
+clean:
+	rm -f *.c~ *.o *.elf *.hex