“main.c”
#include <avr/io.h>
#define F_CPU 1200000U
#include <util/delay.h>
#include "74HC595.h"

unsigned char display = 0x00;

int main(void)
{
    DDRB = PORTB = 0xff;
    while (1)
    {
        HC595_SerIn(~display);
        HC595_ParOut();
        if (display % 2 == 0)
            PORTB |= _BV(4);
        else
            PORTB &= ~_BV(4);
        _delay_ms(500);
        display++;
    }
    return 0;
}

“74HC595.c”
#include <avr/io.h>
#include "74HC595.h"

void HC595_ParOut(void)
{
    HC595_STCK0;
    HC595_STCK1;
}

void HC595_SerIn(unsigned char data)
{
    unsigned char i;
    for (i = 0; i < 8; i++)
    {
        HC595_SHCK0; // CLOCK_MAX = 100MHz
        if (data & _BV(7 - i))
            HC595_SD1;
        else
            HC595_SD0;
        HC595_SHCK1;
    }
}

“74HC595.h”
#define HC595_SHCK1 PORTB|=_BV(2) // PIN11
#define HC595_SHCK0 PORTB&=~_BV(2)
#define HC595_STCK1 PORTB|=_BV(1) // PIN12
#define HC595_STCK0 PORTB&=~_BV(1)
#define HC595_SD1 PORTB|=_BV(0) // PIN14
#define HC595_SD0 PORTB&=~_BV(0)

void HC595_ParOut(void);
void HC595_SerIn(unsigned char data);

“Makefile”
# make
main.hex: main.c 74HC595.c
    avr-gcc -mmcu=attiny13 -Wall -Os main.c 74HC595.c -o main.o
    avr-objcopy -j .text -j .data -O ihex main.o main.hex

# make run   
run: main.hex
    sudo avrdude -p t13 -c usbasp -e -U flash:w:main.hex

执行make run编译并烧写程序。

#define HC595_SHCK1 PORTB|=_BV(2) // PIN11
#define HC595_SHCK0 PORTB&=~_BV(2)
#define HC595_STCK1 PORTB|=_BV(1) // PIN12
#define HC595_STCK0 PORTB&=~_BV(1)
#define HC595_SD1 PORTB|=_BV(0) // PIN14
#define HC595_SD0 PORTB&=~_BV(0)

代码说明：
74HC595的第11脚连接ATtiny的PB2口
第12脚连接ATtiny的PB1口
第14脚连接ATtiny的PB0口

右下角黄LED的正极连接到单片机的PB4口上。

单片机熔丝位的设定：E:FF, H:FF, L:2A
晶振采用默认的内部9.6MHz晶振，开启8分频。