#include <SerialLCD.h>
#include <SoftwareSerial.h>

const int RX1 = 2;
const int TX1 = 3;
const int RX2 = 6;
const int TX2 = 7;

SoftwareSerial SoftSerial(RX1, TX1);
SerialLCD slcd(RX2, TX2);//this is a must, assign soft serial pins

char buffer[64];                   // buffer array for data receive over serial port
int count=0;                                // counter for buffer array
void setup()
{
  // setup the software serial pins
  pinMode(RX1, INPUT);
  pinMode(RX2, INPUT);
  pinMode(TX1, OUTPUT);
  pinMode(TX2, OUTPUT);

}

void loop()
{
  SoftSerial.begin(9600);
    if (SoftSerial.available())                     // if date is coming from software serial port ==> data is coming from SoftSerial shield
    {

        while(SoftSerial.available())               // reading data into char array
        {
            buffer[count++]=SoftSerial.read();      // writing data into array
            if(count == 64)break;
        }

        String gpsline(buffer);

        clearBufferArray();                         // call clearBufferArray function to clear the stored data from the array
        count = 0;                                  // set counter of while loop to zero
    SoftSerial.end();

    if(gpsline.startsWith("$GPGGA")) {
         slcd.begin();

         slcd.clear();
    slcd.print("dd");

          slcd.setCursor(0, 0);
          slcd.print(gpsline.substring(17,19).c_str());
          slcd.setCursor(3, 0);
          slcd.print(gpsline.substring(19,21).c_str());
          slcd.setCursor(6, 0);
          slcd.print(gpsline.substring(22,24).c_str());
          slcd.setCursor(9, 0);
          slcd.print(gpsline.substring(24,26).c_str());

          slcd.setCursor(0, 1);
          slcd.print(gpsline.substring(30,32).c_str());
          slcd.setCursor(3, 1);
          slcd.print(gpsline.substring(32,34).c_str());
          slcd.setCursor(6, 1);
          slcd.print(gpsline.substring(35,37).c_str());
          slcd.setCursor(9, 1);
          slcd.print(gpsline.substring(37,39).c_str());
          slcd.end();

         delay(1000);
        }
    }


}


void clearBufferArray()                     // function to clear buffer array
{
    for (int i=0; i<count;i++)
    {
        buffer[i]=NULL;
    }                      // clear all index of array with command NULL
}