Arduino dot matrix display

/*  Voidrealms Facebook  for attention of Bryan Cairns*/


#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>


#define BUF_SIZE 100

#define HARDWARE_TYPE MD_MAX72XX::FC16_HW  /*< --- This is the hardware desription */
#define MAX_DEVICES 4
#define PAUSE_TIME  4000

#define CLK_PIN   13
#define DATA_PIN  11
#define CS_PIN    10

// Global variables

// HARDWARE SPI
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);


char newMessage[BUF_SIZE] = { "Are you Ready ? Enter new message " };
bool msgReady = false ;

uint8_t scrollSpeed = 50;    // default frame delay value
textEffect_t scrollEffect = PA_SCROLL_LEFT;
textPosition_t scrollAlign = PA_LEFT;
uint16_t scrollPause = 2000; // in milliseconds

char *pChar = newMessage; // this is a pointer declaration

bool printOnce = false ;


void setup() {
  Serial.begin(57600);

  delay(500) ;

  P.begin();
  P.displayText(newMessage, scrollAlign, scrollSpeed, scrollPause, scrollEffect, scrollEffect);
}



void readSerialPort(void)
{


  while (Serial.available())
  {

    // read first byte or first character
    *pChar = (char)Serial.read();
    // Check  for newline
    if ((*pChar == '\n') || (pChar - newMessage >= BUF_SIZE-2)) // end of message character or full buffer
    {
      *pChar = '\0'; // end the string
      // restart the index for next filling spree and flag we have a message waiting
      pChar = newMessage;
      msgReady = true;
    }
    else  // move char pointer to next position
      pChar++;
  }

    if(printOnce)
    {
    Serial.flush();

    Serial.println(newMessage) ;
    printOnce = false ;

    }

}





void loop() {





      if (P.displayAnimate())
          {
            if (msgReady)
            {

              printOnce =true ;
              msgReady = false;
            }
            P.displayReset();
          }


  readSerialPort();

}