orologio tm1638 arduino

#include <TM1638.h>
#include <InvertedTM1638.h>

#define NO_MODULES  1

byte counter = 0;
byte mode = 0;
long runningSecs = -1;
byte hours, minutes, seconds;

// define a regular module and a inverted module
TM1638 module1(8, 9, 10);
TM1638* modules[NO_MODULES] = {
  &module1
};

void setup() {
  //startTime = millis();

  modules[0]->setupDisplay(true, 7);
  modules[0]->setDisplayToString("        ");
  modules[0]->setLEDs(0);
}

void loop() {
  byte buttons = modules[0]->getButtons();

  if (buttons != 0) {
    mode = buttons >> 1;
    switch(mode) {
      case 0: break;
      case 1: break;
      case 2: break;
      case 4: break;
      case 8: break;
      case 16: break;
      case 32: break;
      case 64: break;
    }
  }

  counter++;
  if (counter==9) { counter = 1; }
  switch(counter) {
    case 1:
      runningSecs = runningSecs + 1;
      hours = runningSecs / 3600;
      runningSecs = runningSecs % 3600;
      minutes = runningSecs / 60;
      seconds = runningSecs % 60;

      char s[8];
      sprintf(s, "%02d %02d %02d", hours, minutes, seconds);
      modules[0]->setDisplayToString(s);

      modules[0]->setLEDs(1);
    break;
    case 2: modules[0]->setLEDs(2); break;
    case 3: modules[0]->setLEDs(4); break;
    case 4: modules[0]->setLEDs(8); break;
    case 5: modules[0]->setLEDs(16); break;
    case 6: modules[0]->setLEDs(32); break;
    case 7: modules[0]->setLEDs(64); break;
    case 8: modules[0]->setLEDs(128); break;
  }
  delay(125);
}