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/* PA3BNX FT817 S-meter
 * 12-10-2016
 * 13-10-2016
 * I understand that the Arduino Uno and Nano have just one UART
 * so we must connect a max232 on pin 0 and 1
 * Todo communication to the FT817 with Cat62 Yaesu Cable
 * One INPUT pin with button for Reset The S meter display
 */

//Integer
const int cDelayTime=1000;
const byte cUarray=100;
const byte cEmpty=255;
const byte cResetPin=2;

//String
String inputString;
//Bool
bool bStringComplete;
//Array
byte arrS[cUarray];

//Functions
void AddNewSmeter(byte s)
{
static int c;

//With 255 just reset pointer
if (s==cEmpty) {c=0;return;}

c+=1;

if (c>cUarray)
{
  for (byte i=1;i<cUarray;i++)
  {
   arrS[i-1]=arrS[i];
  }
 c=cUarray;
}

arrS[c]=s;
}//Last StoreSmeter


void AskFreqFT817()
{
  //Read RX Status
  //x,x,x.x,e7 (231)
  byte buf[]={0,0,0,0,231};
  Serial.write(buf,5);
}//Last Ask


void ClearSmeter()
{
for (int i=0;i<cUarray;i++)
 {
  arrS[i]=cEmpty;
 }
}//Last ClearSmeter

byte ExtractFT817Smeter(String MyString)
{
  //Not ready yet
  //Read RX Status
  //x,x,x.x,f7  (247)
  //76543210
  //3210=S meter data
  //7=Squels
  byte x;
  byte buf[5];

  MyString.getBytes(buf,5);
     
  if (buf[4]==247)
  {
   if (buf[0] && 1) {x+=1;}
   if (buf[0] && 2){x+=2;}
   if (buf[0] && 4){x+=4;}
   if (buf[0] && 8){x+=8;}
   //x ranges between 0 and 15
   return x;
  }
   return cEmpty;
}//Last ExtractFT817Smeter

void SerialEvent()
 {
   while (Serial.available()) {
    //get the new byte:
    byte inByte=(byte)Serial.read();
   
    if (inputString.length() > 4 )
     {
      bStringComplete=true;
     }
     else
     {
      //add it to the inputString:
      inputString+=inByte;
     }
   }
 }//Last SerialEvent
   

void GFXDisplay()
{
//Show here the Values in arrS[]
//On a Display
for (byte i=0;i<cUarray;i++)
{
 if (arrS[i]=cEmpty){return;}
 //Draw here values from arrS[]
}
}//Last GFXDisplay

void setup() {
  // put your setup code here, to run once:
Serial.begin(4800);

pinMode(13,OUTPUT);//Led 13 as Received Cat-ft817 cmd
pinMode(cResetPin,INPUT_PULLUP);

ClearSmeter();
AddNewSmeter(cEmpty);

}

void loop() {
  // put your main code here, to run repeatedly:

byte count;

AskFreqFT817();

SerialEvent();

delay(cDelayTime);

 tryagain:

if (bStringComplete==true)
{
 digitalWrite(13,HIGH);//Something RXed

 if (digitalRead(cResetPin)==LOW)
 {
  ClearSmeter();
  AddNewSmeter(cEmpty);
  GFXDisplay();
 }
 
 if (inputString != "")
  {
   byte s = ExtractFT817Smeter(inputString); 
   AddNewSmeter(s);
   GFXDisplay();
  }
  digitalWrite(13,LOW);//Processed Something RXed
 }
else
 {
  //Try max 10 times before ask for new Smeter
  count+=1;
  if (count<10)
   {
    //Wait for RXed data
    SerialEvent();
    goto tryagain;
   }
   
 }//Last bStringComplete

 inputString="";
 bStringComplete=false;
 count=0; //Not needed I think because loop starts again

}//Last Loop