test up/dow seg7 + btn

 int seg7_pin[] = {2, 3, 4, 5, 6, 7, 8};

int seg7_table[] = {~0xc0, ~0xf9, ~0xa4, ~0xb0, ~0x99, ~0x92, ~0x82, ~0xf8, ~0x80, ~0x90};

int delaytime = 1000;

int btn_pin = 9;

int num_val;

int cnt_val;

int even_odd;

void setup()

{

  pinMode(btn_pin, INPUT);

  for (int i = 0; i < 7; i++)

  {

    pinMode(seg7_pin[i], OUTPUT);

    digitalWrite(seg7_pin[i], LOW);

  }

}

//-------------------------------

void outport(byte data)

{

  for (int j = 0; j < 7; j++)

  {

    if (data % 2 == 1)

      digitalWrite(seg7_pin[j], HIGH);

    else

      digitalWrite(seg7_pin[j], LOW);

    data = data / 2;

  }

}

void loop() {

  num_val = digitalRead(btn_pin);

  if (num_val == 0)

  {

    while (digitalRead(btn_pin) == LOW)

    {

      even_odd++;

    }

  }

  if (even_odd % 2 == 0)

  {

    if (cnt_val == 9)

      cnt_val = 0;

    else

      cnt_val++;

  }

  else

  {

    if (cnt_val == 0)

      cnt_val = 9;

    else

      cnt_val--;

  }

  outport(seg7_table[cnt_val]);

  delay(delaytime);

}