HIKVISION DVR ALARM TEXT SCROLLING DISPLAY MAX7219 DOT MATRIX USING ARDUINO UNO

// Program to exercise the MD_MAX72XX library
//
// Uses most of the functions in the library
#include <MD_MAX72xx.h>

// Turn on debug statements to the serial output
#define  DEBUG  1
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#if  DEBUG
#define PRINT(s, x) { Serial.print(F(s)); Serial.print(x); }
#define PRINTS(x) Serial.print(F(x))
#define PRINTD(x) Serial.println(x, DEC)
const int buttonPin = 2;     // the number of the pushbutton pin
int buttonState = 0;         // variable for reading the pushbutton status
#else
#define PRINT(s, x)
#define PRINTS(x)
#define PRINTD(x)

#endif

// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers will probably not work with your hardware and may
// need to be adapted
#define MAX_DEVICES  4

#define CLK_PIN   13  // or SCK
#define DATA_PIN  11  // or MOSI
#define CS_PIN    10  // or SS

// SPI hardware interface
MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// Specific SPI hardware interface
//MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, SPI1, CS_PIN, MAX_DEVICES);
// Arbitrary pins
//MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

// We always wait a bit between updates of the display
#define  DELAYTIME  100  // in milliseconds


void scrollText(const char *p)
{
  uint8_t charWidth;
  uint8_t cBuf[8];  // this should be ok for all built-in fonts

  PRINTS("\nScrolling text");
  mx.clear();

  while (*p != '\0')
  {
    charWidth = mx.getChar(*p++, sizeof(cBuf) / sizeof(cBuf[0]), cBuf);

    for (uint8_t i=0; i<=charWidth; i++)  // allow space between characters
    {
      mx.transform(MD_MAX72XX::TSL);
      if (i < charWidth)
        mx.setColumn(0, cBuf[i]);
      delay(DELAYTIME);
    }
  }
}


void bounce()
// Animation of a bouncing ball
{
  const int minC = 0;
  const int maxC = mx.getColumnCount()-1;
  const int minR = 0;
  const int maxR = ROW_SIZE-1;

  int  nCounter = 0;

  int  r = 0, c = 2;
  int8_t dR = 1, dC = 1;  // delta row and column

  PRINTS("\nBouncing ball");
  mx.clear();

  while (nCounter++ < 200)
  {
    mx.setPoint(r, c, false);
    r += dR;
    c += dC;
    mx.setPoint(r, c, true);
    delay(DELAYTIME/2);

    if ((r == minR) || (r == maxR))
      dR = -dR;
    if ((c == minC) || (c == maxC))
      dC = -dC;
  }
}


void setup()

{

    // initialize the pushbutton pin as an input:

  mx.begin();

#if  DEBUG
  Serial.begin(57600);
#endif
  PRINTS("\n[MD_MAX72XX Test & Demo]");
//  scrollText("MD_MAX72xx Test  ");
}

void loop()

{
  pinMode(buttonPin, INPUT);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
 scrollText("ALARM");
 delay(1000);
}
else
{
  bounce();
}
}