#include <Arduino.h>
#include <MsTimer2.h>

#define SEG_A   0   //PIN 0
#define SEG_B   1   //PIN 1
#define SEG_C   2   //PIN 2
#define SEG_D   3   //PIN 3
#define SEG_E   4   //PIN 4
#define SEG_F   5   //PIN 5
#define SEG_G   6   //PIN 6
#define SEG_DP  7   //PIN 7

uint8_t SegPin[] = {
  SEG_A, SEG_B, SEG_C, SEG_D,
  SEG_E, SEG_F, SEG_G, SEG_DP
};

uint8_t SegCnt[] = {
  0x40, 0x79, 0x24, 0x30, 0x19,
  0x12, 0x02, 0x58, 0x00, 0x10
};

volatile bool CntFlg = false;

void count() {
  CntFlg = true;
}

void setup() {
  for (uint8_t i = 0; i < 8; i++) {
    digitalWrite(SegPin[i], HIGH);
    pinMode(SegPin[i], OUTPUT);
  }

  MsTimer2::set(500, count); // 500msごと
  MsTimer2::start();
}

void loop() {
  if (CntFlg) {
    CntFlg = false;
    static boolean dp = HIGH;
    static uint8_t cnt = 0;
    dp = !dp;
    if (!dp) {
      if (cnt >= 9) {
        cnt = 0;
      } else {
        cnt++;
      }
      for (uint8_t i = 0; i < 7; i++) {
        digitalWrite(SegPin[i], (SegCnt[cnt] & (1 << i)));
      }
    }
    digitalWrite(SEG_DP, dp);
  }
}