Dot Matrix Display Interface with Arduino using MAX7219 Driver

#include <SPI.h>

#define CHIP_SELECT 7

void sendData(uint8_t address, uint8_t dat) {
  digitalWrite(CHIP_SELECT, LOW);
  SPI.transfer(address);
  SPI.transfer(dat);
  digitalWrite(CHIP_SELECT, HIGH);
}
  

void setup() {
  pinMode(CHIP_SELECT, OUTPUT);
  SPI.setBitOrder(MSBFIRST);
  SPI.begin();
  
  /*--------------------INIT--------------------*/
  sendData(0x0F, 0x01);  //Run test, All LED segments should light up
  delay(1000);
  sendData(0x0F, 0x00);  //End Test
  
  sendData(0x09, 0x00);  //Decode Mode
  sendData(0x0A, 0x00);  //Lowest Intensity 
  sendData(0x0B, 0x0F);  //Scan all digits
  sendData(0x0C, 0x01);  //Turn on chip
/*--------------------PH--------------------*/
  sendData(0x01, 0xff);
  sendData(0x02, 0x09);
  sendData(0x03, 0x09);
  sendData(0x04, 0x06);
  sendData(0x05, 0xff);
  sendData(0x06, 0x18);
  sendData(0x07, 0x18);
  sendData(0x08, 0xff);
  delay(1500);
  
}

void loop() {
/*--------------------:)--------------------*/
  sendData(0x01, 0b00);
  sendData(0x02, 0x06);
  sendData(0x03, 0x26);
  sendData(0x04, 0x40);
  sendData(0x05, 0x40);
  sendData(0x06, 0x26);
  sendData(0x07, 0x06);
  sendData(0x08, 0x00);
  delay(1000);
/*--------------------:|--------------------*/
  sendData(0x01, 0b00);
  sendData(0x02, 0x06);
  sendData(0x03, 0x46);
  sendData(0x04, 0x40);
  sendData(0x05, 0x40);
  sendData(0x06, 0x46);
  sendData(0x07, 0x06);
  sendData(0x08, 0x00);
/*--------------------:'(--------------------*/
  delay(1000);
  sendData(0x01, 0b00);
  sendData(0x02, 0x06);
  sendData(0x03, 0x86);
  sendData(0x04, 0x40);
  sendData(0x05, 0x40);
  sendData(0x06, 0x86);
  sendData(0x07, 0x16);
  sendData(0x08, 0x00);
  delay(1000);
}