#include <SoftwareSerial.h>

#define DEBUG // Comment this out for release version to get rid of the debug print statements

#define LedDispSoftSerRxPin 11
#define LedDispSoftSerTxPin 12
#define LedDispSoftSerBaudRate 9600

SoftwareSerial LedDispSoftSer(LedDispSoftSerRxPin, LedDispSoftSerTxPin);

#define DE_PIN 10
#define RE_PIN 14

const int16_t interval = 1000; // interval (in milliseconds) between to measurements

// Define the data to send to the LED display
const uint8_t header   = 0x5A; // byte 0
const uint8_t address  = 0xFA; // byte 1
const uint8_t byte2    = 0x00;
const uint8_t byte3    = 0x00;
//    uint8_t byte4    = (data2 / 10000) % 100;
//    uint8_t byte5    = (data2 / 100) % 100;
//    uint8_t byte6    = data2 % 100;
//    uint8_t checksum = header + address + byte2 + byte3 + byte4 + byte5 + byte6;  // Keep only the lower 8 bits

#ifdef DEBUG
  void printPaddedUnsignedDecimal(int Value)
  {
    char buffer[6];
    sprintf(buffer, "%02u", Value);
    Serial.println(buffer);
  }
#endif

uint32_t GetData(int whateverNeeded){
  // do here what has to be done to get the data
  // you want to send to he LEDs
  // using the whateverNeeded parameter(s)
  int32_t data = 506070;
  return data;
}

void SendDataToLEDs(uint32_t data){
  // do here what has to be done to send the data
  
  uint8_t byte4 = (data / 10000) % 100;
  uint8_t byte5 = (data / 100) % 100;
  uint8_t byte6 = data % 100;
  uint8_t checksum = header + address + byte2 + byte3 + byte4 + byte5 + byte6;

  digitalWrite(DE_PIN, HIGH);
  digitalWrite(RE_PIN, HIGH);

  LedDispSoftSer.write(header);
  LedDispSoftSer.write(address);
  LedDispSoftSer.write(byte2);
  LedDispSoftSer.write(byte3);
  LedDispSoftSer.write(byte4);
  LedDispSoftSer.write(byte5);
  LedDispSoftSer.write(byte6);
  LedDispSoftSer.write(checksum);

  // Set the MAX485 to receive mode
  digitalWrite(DE_PIN, LOW);
  digitalWrite(RE_PIN, LOW);
  
  #ifdef DEBUG
    Serial.print("Header   : ");
    printPaddedUnsignedDecimal(header);

    Serial.print("address  : ");
    printPaddedUnsignedDecimal(address);

    Serial.print("byte2    : ");
    printPaddedUnsignedDecimal(byte2);

    Serial.print("byte3    : ");
    printPaddedUnsignedDecimal(byte3);

    Serial.print("byte4    : ");
    printPaddedUnsignedDecimal(byte4);

    Serial.print("byte5    : ");
    printPaddedUnsignedDecimal(byte5);

    Serial.print("byte6    : ");
    printPaddedUnsignedDecimal(byte6);

    Serial.print("checksum : ");
    printPaddedUnsignedDecimal(checksum);
    Serial.println();
  #endif
}

uint32_t data = 506070;

void setup() {
  Serial.begin(9600);

  // Set up the UART interface
  LedDispSoftSer.begin(LedDispSoftSerBaudRate);

  pinMode(DE_PIN, OUTPUT);
  pinMode(RE_PIN, OUTPUT);

  digitalWrite(DE_PIN, LOW);
  digitalWrite(RE_PIN, LOW);

  // Do the other settings here
  SendDataToLEDs(data);
}

void loop() {
  static uint64_t startTime = 0; // unsigned long "time keeper"
  if (millis() - startTime >= interval) {
    startTime += interval;

    // do relaxed things here
    // int whateverNeeded = 1; // represents the parameter(s) required by the GetData function
    // uint32_t data = GetData(whateverNeeded);
    // SendDataToLEDs(data);
  }
  
  if(Serial.available())     //if data available
  {
    String Message = Serial.readStringUntil('\n');
    Message.trim();              // remove any \r \n whitespace at the end of the String
    data = Message.toInt();
    SendDataToLEDs(data);
  }
}