AVR Test Application

C Source Code

The program is pretty simple. It blinks an LED attached to PB0.

#define F_CPU 1000000UL
#include <avr/io.h>
#include <util/delay.h>

int main( void )
{
        DDRB |= 1;              // Change to 16 for ATtiny13
        while( 1 )
        {
                PORTB &= ~1;    // Change to 16 for ATtiny13
                _delay_ms( 200 );
                _delay_ms( 200 );
                _delay_ms( 200 );
                _delay_ms( 200 );
                PORTB |= 1;     // Change to 16 for ATtiny13
                _delay_ms( 200 );
                _delay_ms( 200 );
                _delay_ms( 200 );
                _delay_ms( 200 );
        }
        return 0;
}

Makefile

The Makefile is also simple. This one is for Linux. Change the "-mmcu=atmega32" to whatever microcontroller you are using. Also change the "-p m32" on the avrdude command tail to match your microcontroller.

CC=/usr/bin/avr-gcc
CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=atmega32
OBJ2HEX=/usr/bin/avr-objcopy
LOADER=/usr/bin/avrdude -c arduino -P /dev/ttyUSB0 -p m32 -b 19200 -U flash:w:
TARGET=blink

all : $(TARGET).hex
        $(LOADER)$(TARGET).hex

%.obj : %.o
        $(CC) $(CFLAGS) $< -o $@

%.hex : %.obj
        $(OBJ2HEX) -R .eeprom -O ihex $< $@

clean :
        rm -f *.hex *.obj *.o

The makefile is a little different for WinAVR. This makefile is courtesy of Ken.

CC=avr-gcc
CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=attiny13
OBJ2HEX=avr-objcopy
LOADER=avrdude -c usbtiny -P USB -p t13 -b 19200 -U flash:w:
TARGET=Blinky

all:    $(TARGET).hex
                $(LOADER)$(TARGET).hex

$(TARGET).o:    $(TARGET).c
                        $(CC) $(CFLAGS) $< -o $@

$(TARGET).hex:  $(TARGET).o
                        $(OBJ2HEX) -R .eeprom -O ihex $< $@

clean:
                rm -f *.hex *.obj *.o