Working with AVR-gcc, tiny13, STK500 on a Mac.

First, install the packages (avr-gcc, binutils etc) for compiling/linking AVR programs in Mac OS X. I followed the instruction here: Programming an AVR microcontroller

Afterward, it is time to start my first led program in C.

I decide to use PB0 as led output, I connect the PB0 to Led0 on STk500 to start this testing program quickly.

#include <avr/io.h>
#define F_CPU 120000
#include <util/delay.h>
int main (void)
{

// set PB.0 as output pin

DDRB  = 0x01;

// set PB.0 to output high

PORTB = 0x01;

while (1) {

PORTB ^= 0x01;

_delay_loop_2(65535);

}

}

Compile the program:

avr-gcc led_blink.c -o led.elf -mmcu=attiny13

Convert the elf format to hex format for flashing to the Tiny13:

avr-objcopy -O ihex led.elf led.rom

Prepare avrdude for Mac to flash program and find out the serial port device name on your Mac OS X. I am using usb2serial adapter, the serial port device is /dev/cu.usbserial and connected to stk500 RS232 CTRL port with the serial cable provided in stk500 kit.

avrdude -p t13 -c stk500v2 -P /dev/cu.usbserial -e -U flash:w:led.rom

If it programs successfully, you will see the LED0 is flashing on STk500 board.