#include <Arduino.h>
#include <TM1637Display.h>

// Module connection pins (Digital Pins)
#define CLK 2
#define DIO 3

// The amount of time (in milliseconds) between tests
#define TEST_DELAY   500

const uint8_t SEG_DONE[] = {
  SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,           // d
  SEG_C | SEG_D | SEG_E | SEG_G,                   // o
  SEG_C | SEG_E | SEG_G,                           // n
  SEG_A | SEG_D | SEG_E | SEG_F | SEG_G            // E
};

TM1637Display display(CLK, DIO);

void setup() {
}

void loop() {
  int k;
  uint8_t data[] = { 0x7f, 0xff, 0x7f, 0x7f };
//  uint8_t data[] = { 15, 31, 63, 127 };
  display.setBrightness(0x0f);

  // All segments on
  display.setSegments(data);  delay(TEST_DELAY*4);

  // Selectively set different digits
  data[0] = display.encodeDigit(0);
  data[0] = 0b00000111; // GFEDCBA
  data[1] = display.encodeDigit(1);
  data[2] = display.encodeDigit(2);
  data[3] = display.encodeDigit(3);
  display.setSegments(data, 4, 0);  delay(TEST_DELAY);  // display 4 char at pos 0

  for (k = 0; k <4; k++) {
    display.setSegments(data, 1, k);    delay(TEST_DELAY);  // display 1 char at pos k
  }

  display.setSegments(data+2, 2, 2);  delay(TEST_DELAY);
  display.setSegments(data+2, 2, 1);  delay(TEST_DELAY);
  display.setSegments(data+1, 3, 1);  delay(TEST_DELAY);

  // Show decimal numbers
  randomSeed(analogRead(0));
  bool lz = false;  // without leading zeros
  for (uint8_t z = 0; z < 2; z++) {
    for (k = 0; k < 10000; k += 4*k+7) {
//      display.showNumberDec(k, lz);   delay(TEST_DELAY);
        display.showNumberDec(random(10000), lz);   delay(TEST_DELAY);
    }
    lz = true;  // with leading zeros
  }

  // Show decimal number whose length is smaller than 4
  for (k = 0; k < 4; k++) data[k] = 0;
  display.setSegments(data);  // all off

  // show number 153 (%3d) without leading zero at pos 1
  display.showNumberDec(153, false, 3, 1);  delay(TEST_DELAY);
  // show number  22 (%2d) without leading zero at pos 2
  display.showNumberDec( 22, false, 2, 2);  delay(TEST_DELAY);
  
  display.showNumberDec(8, true, 1, 3);  delay(TEST_DELAY);
  display.showNumberDec(4, true, 2, 2);  delay(TEST_DELAY);
  display.showNumberDec(2, true, 1, 1);  delay(TEST_DELAY);
  display.showNumberDec(5, true, 1, 0);  delay(TEST_DELAY);

  // Brightness Test 0-7,8-15
  for (k = 0; k < 4; k++) data[k] = 0xff;
  for (k = 0; k < 16; k++) {
    display.setBrightness(k);
    display.showNumberDec(k, true);  delay(TEST_DELAY);
    //display.setSegments(data);  delay(TEST_DELAY*2);
  }
  display.setBrightness(0);
  display.setSegments(SEG_DONE);
//  while (1);
  delay(2000);
}