Arduino Mega Lauflicht mit TPIC6B595

#include <SPI.h>

// PIN SETUP

const int latchPin = 53; // SS   (SPI) -> RCK    (TPIC6B595)

const int clockPin = 52; // SCK  (SPI) -> SRCK   (TPIC6B595)

const int dataPin  = 51; // MOSI (SPI) -> SER IN (TPIC6B595)

const int clearPin = 40; // D40  (ard) -> SRCLR  (TPIC6B595)

int pause =  1000;

void setup() {

  Serial.begin(9600);

  pinMode(clockPin, OUTPUT);

  pinMode(dataPin,  OUTPUT);

  pinMode(latchPin, OUTPUT);

  pinMode(clearPin, OUTPUT);

  digitalWrite(clearPin, HIGH);

  SPI.beginTransaction(SPISettings(16000000, MSBFIRST, SPI_MODE0));

}

int count = 8;

byte pos;

int totalBytes = 2;

int totalBits = totalBytes * 8;

byte bytes[] = { 

  B00000000, 

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000,

  B00000000

};

void loop() {

  for(int theByte = 0; theByte < totalBytes; theByte++) {

    bytes[theByte] = B00000000;

    for(int theBit = 0; theBit < 8; theBit++) {

      if(theByte == int(count / 8)) {

        if(theBit == pos) {

          bitWrite(bytes[theByte], theBit,1);

        }

      }

    }

    SPI.transfer(bytes[theByte]);

  }

  pulsePin();

  delay(pause);

  //update count

  count++;

  if(count >= totalBits) count = 0; 

  pos = count % 8;

  Serial.println(int(count / 8));

  Serial.print("\t");

  Serial.println(count % 8);

}

void write(byte bits) {

  SPI.transfer(bits);

  pulsePin();

}

void pulsePin() {

  digitalWrite(latchPin, LOW);

  digitalWrite(latchPin, HIGH);

}