Datasheet

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avrdude -qq -c gpio -p atmega328p -U lock:w:0x3F:m -U efuse:w:0x07:m -

U lfuse:w:0xE7:m -U hfuse:w:0xD9:m

@avr-objcopy -j .text -j .data -O ihex $(TARGET).elf $(TARGET).hex

$(TARGET).elf: $(OBJ)

@echo [Link] $<

@$(LD) -o $@ $(OBJ) $(LDFLAGS) $(LIBS)

@avr-size $(TARGET).elf

# Generate .lst file rule

%.lst : %.o

@echo [lst] $<

@avr-objdump -h -S $<> $@

.c.o:

@echo [CC] $<

@$(CC) -c $(CFLAGS) $< -o $@

.PHONEY: clean

clean:

rm -f *.o *.elf *.hex *.lst Makefile.bak *~

Program 328

#!/bin/bash

# script to program 328p device using AVRDUDE and a hex file

if [ "$1" == "" ]; then echo Missing argument

exit 1;

# if ends in .hex use full argument

# otherwise add the .hex

ext=${1:${#1}-4}

if [ "$ext" == ".hex" ]; then

/usr/bin/avrdude -c gpio -p m328p $1 -Uflash:w:$1

else

/usr/bin/avrdude -c gpio -p m328p $1.hex -Uflash:w:$1.hex

Save the above code in a file called program_328 and then run "chmod 777 program_328". Use

./program_328 <hex file> to program the Atmega device.

Initial clock setup

You normally run the above command when you get a brand new device. It programs the

Atmega328 to use the external 16MHz Crystal.