Sneak Peek Embedded World 23

#include <Adafruit_NeoPixel.h>
#define PIN 4
#define NUMPIXELS 7 * 6
#define BRIGHTNESS 255  // Reduce brightness if you have issues with PSU
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#include "OPTIGATrustM.h"

#define RND_LENGTH 8

bool displayNumber(uint8_t number, uint32_t color);
bool valid_number = true;

// Define colours
uint32_t colors[] = {
  pixels.Color(200, 200, 200),  // Engineering
  pixels.Color(0, 255, 255),    // Ocean
  pixels.Color(0, 255, 0),      // Lawn
  pixels.Color(255, 0, 200),    // Berry
  pixels.Color(255, 110, 0),    // Sun
  pixels.Color(255, 255, 0)     // Sand
};

void setup() {
  /* Prepare status LED on XMC 2Go */
  pinMode(LED1, OUTPUT);
  digitalWrite(LED1, LOW);

  /* Initialise an OPTIGA™ Trust X Board */
  uint8_t ret = trustM.begin();
  while (ret) {
    delay(5);
    ret = trustM.begin();
  }

  /* Speedup the board (from 6 mA to 15 mA) */
  trustM.setCurrentLimit(8);

  /* Initialise the Display LEDs */
  pixels.begin();  // INITIALIZE NeoPixel strip object (REQUIRED)
  pixels.setBrightness(BRIGHTNESS);
  pixels.clear();  // Set all pixel colors to 'off'
}

void loop() {
  /* Toggle status LED to show number generation is ongoing */
  digitalWrite(LED1, HIGH);

  uint32_t ret = 0;
  uint8_t cntr = 10;
  uint8_t *rnd = new uint8_t[RND_LENGTH];
  uint32_t ts = 0;

  /* Initialise Memmory Area */
  memset(rnd, 0, RND_LENGTH);

  /*Generate Random value */
  ret = trustM.getRandom(8, rnd);
  uint8_t rnum = rnd[0] / 34;

  // Roll the dice
  if (valid_number) {
    uint32_t delay_ms = 50;
    for (uint8_t n = 0; n < 3; n++) {
      for (uint8_t i = 0; i < 6; i++) {
        /* Display each number in different color */
        displayNumber(i + 1, colors[i]);
        delay(delay_ms);
        delay_ms += 6;
      }
    }
  }

  /* Display number if between 1-6, else return false */
  valid_number = displayNumber(rnum, colors[rnum - 1]);

  /* Remove dynamically allocated data */
  delete rnd;

  if (valid_number) {
    digitalWrite(LED1, LOW);  // Run was successfull, turn of status LED.
    while (1) delay(1000);
  }  //don't run again in case a number is displayed
}

bool displayNumber(uint8_t number, uint32_t color) {
  switch (number) {
    case 1:
      pixels.clear();
      for (int i = 0; i < 6; i++) {
        pixels.setPixelColor(3 + i * 7, color);
      }
      pixels.show();
      break;
    case 2:
      pixels.clear();
      for (int i = 0; i < 6; i++) {
        if (i == 1) {
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
        } else if (i == 2) {
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
        } else {
          pixels.setPixelColor(2 + i * 7, color);
          pixels.setPixelColor(4 + i * 7, color);
        }
      }
      pixels.show();
      break;
    case 3:
      pixels.clear();
      for (int i = 0; i < 6; i++) {
        if (i == 1) {
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(3 + i * 7, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
        } else if (i == 2) {
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(3 + i * 7, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
        } else {
          pixels.setPixelColor(2 + i * 7, color);
          pixels.setPixelColor(3 + i * 7, color);
          pixels.setPixelColor(4 + i * 7, color);
        }
      }
      pixels.show();
      break;
    case 4:
      pixels.clear();
      for (int i = 0; i < 6; i++) {
        if (i == 1) {
          pixels.setPixelColor(0 + i * 7, color);
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
          pixels.setPixelColor(6 + i * 7, color);
        } else if (i == 2) {
          pixels.setPixelColor(0 + i * 7, color);
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
          pixels.setPixelColor(6 + i * 7, color);
        } else {
          pixels.setPixelColor(0 + i * 7, color);
          pixels.setPixelColor(2 + i * 7, color);
          pixels.setPixelColor(4 + i * 7, color);
          pixels.setPixelColor(6 + i * 7, color);
        }
      }
      pixels.show();
      break;
    case 5:
      pixels.clear();
      for (int i = 0; i < 6; i++) {
        if (i == 1) {
          pixels.setPixelColor(0 + i * 7, color);
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(3 + i * 7, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
          pixels.setPixelColor(6 + i * 7, color);
        } else if (i == 2) {
          pixels.setPixelColor(0 + i * 7, color);
          pixels.setPixelColor(2 + i * 7 - 1, color);
          pixels.setPixelColor(3 + i * 7, color);
          pixels.setPixelColor(4 + i * 7 + 1, color);
          pixels.setPixelColor(6 + i * 7, color);
        } else {
          pixels.setPixelColor(0 + i * 7, color);
          pixels.setPixelColor(2 + i * 7, color);
          pixels.setPixelColor(3 + i * 7, color);
          pixels.setPixelColor(4 + i * 7, color);
          pixels.setPixelColor(6 + i * 7, color);
        }
      }
      pixels.show();
      break;
    case 6:
      pixels.clear();
      for (int i = 0; i < 6; i++) {
        pixels.setPixelColor(0 + i * 7, color);
        pixels.setPixelColor(1 + i * 7, color);
        pixels.setPixelColor(2 + i * 7, color);
        pixels.setPixelColor(4 + i * 7, color);
        pixels.setPixelColor(5 + i * 7, color);
        pixels.setPixelColor(6 + i * 7, color);
      }
      pixels.show();
      break;
    default:
      /* No valid number entered. Return fail, try again */
      return false;
      break;
  }
  /* Valid number entered and displayed */
  return true;
}