#include "SmartMatrix.h"
    #include "FastLED.h"
    #include "Time.h"

    #define kMatrixWidth  32
    #define kMatrixHeight 32
    const bool    kMatrixSerpentineLayout = false;

    uint32_t nextFrame = 0;

    #define NUM_LEDS (kMatrixWidth * kMatrixHeight)
    #define DEFAULT_BRIGHTNESS 255

    CRGB leds[kMatrixWidth * kMatrixHeight];

    const rgb24 COLOR_BLACK = { 0,0,0 };
    const rgb24 COLOR_WHITE = { 255,255,255};

    time_t getTeensy3Time()
    {
      return Teensy3Clock.get();
    }

    void setup() {
      LEDS.addLeds<SmartMatrix>(leds,NUM_LEDS);
            LEDS.setBrightness(DEFAULT_BRIGHTNESS);
            pSmartMatrix->setColorCorrection(cc24);
            setSyncProvider(getTeensy3Time);
            pSmartMatrix->fillScreen(COLOR_BLACK);
            LEDS.show();
    }

    void loop() {
            digitalClock();
            LEDS.show();
    }

    void digitalClock() {
      if(millis() >= nextFrame) {
        char str[32];
        sprintf(str,"%02d", hour());
        pSmartMatrix->setFont(font5x7);
        pSmartMatrix->fillScreen(CRGB(CHSV(100,0,255)));
        pSmartMatrix->fillRectangle(0,0,31,15,CRGB(CHSV(0,255,255)));
        pSmartMatrix->fillRoundRectangle(3,12,28,19,1,CRGB(CHSV(0,0,0)));
        pSmartMatrix->drawString(4,13,CRGB(CHSV(255,0,255)),str);
        sprintf(str,"%02d", minute());
        pSmartMatrix->drawString(19,13,CRGB(255,255,255),str);
        if(second()%2) {
         pSmartMatrix->drawString(13,12,CRGB(255,255,255),":");
        }
        nextFrame = millis() + 1000;
      }
    }