//By Tyler Gerritsen
//2017-11-25
//vtgerritsen@gmail.com

//2018-09-08 Added negative number recognition

//Serial Commander

/*
Call getCommand() function regularly. 
Will return true when a command has been recieved. 
COMstring will contain the non-numerical string. 
COMvalue will contain the numerical argument.
*/

String COMstring;
long COMvalue;
const char terminator = '/';



boolean getCommand() {
  static byte i = 0;
  static char stringChar[20];
  boolean newCommand = false;
  COMstring = "";
  COMvalue = 0;
  if (Serial.available()) {
    char COMinput = Serial.read();
    if (COMinput == terminator) newCommand = true;
    else if (COMinput > 47 || COMinput == 45) {
      stringChar[i] = COMinput;
      i++;
    }
    if (newCommand) {
      byte neg = 0;
      COMvalue = 0;
      for (byte j = 0; j < i; j++) {
        if (!COMvalue && stringChar[j] == '-') neg = 1;
        else if (stringChar[j] > 57) COMstring += String(stringChar[j]);
        else COMvalue = COMvalue * 10 + stringChar[j] - '0';
        stringChar[j] = 0;
      }
      i = 0;
      if (neg) COMvalue *= -1;
    }
  }
  return newCommand;
}