const int test_pin1 = 2;
const int test_pin2 = 3;
volatile byte state = LOW;

void stepper_init() {
  cli();  // 关闭全局中断

  //设置定时器0为10kHz(100us)
  TCCR0A = 0;  //将整个TCCR0A寄存器设置为0
  TCCR0B = 0;  //将整个TCCR0B寄存器设置为0
  TCNT0 = 0;   //将计数器值初始化为0
  //设置计数器为10kHZ，即100us
  OCR0A = 24;  //比较匹配寄存器= [16,000,000Hz /（预分频器*所需中断频率）] - 1
  //比较匹配寄存器=24,中断间隔=100us即中断频率10khz
  TCCR0A |= (1 << WGM01);               //打开CTC模式
  TCCR0B |= (1 << CS01) | (1 << CS00);  //设置CS01位为1，CS00位为1(64倍预分频)
  // TIMSK0 |= (1 << OCIE0A);              //启用定时器比较中断

  //设置定时器1为1Hz(1s)
  TCCR1A = 0;  //将整个TCCR1A寄存器设置为0
  TCCR1B = 0;  //将整个TCCR1B寄存器设置为0
  TCNT1 = 0;   //将计数器值初始化为0
  //设置计数器为1HZ，即1s
  OCR1A = 15624;  //比较匹配寄存器= [16,000,000Hz /（预分频器*所需中断频率）] - 1
  TCCR1B |= (1 << WGM12);               //打开CTC模式
  TCCR1B |= (1 << CS12) | (1 << CS10);  //设置CS12位为1，CS10位为1(1024倍预分频)
  // TIMSK1 |= (1 << OCIE1A);              //启用定时器比较中断

  sei();  // 打开全局中断
}

//中断0服务函数
ISR(TIMER1_COMPA_vect) {
  state = !state;
  TIMSK1 &= ~(1 << OCIE1A);
}

void setup() {
  Serial.begin(9600);
  DDRD |= ((1 << test_pin1) | (1 << test_pin2));
  stepper_init();
}

void loop() {
  if (state == LOW) {
    PORTD &= ~((1 << test_pin1) | (1 << test_pin2));
    Serial.println(PORTD, BIN);
  } else {
    PORTD |= ((1 << test_pin1) | (1 << test_pin2));
    Serial.println(PORTD, BIN);
  }
  delay(500);
}