Using AD5061 with Arduino Due

Projects Networking, Protocols, and Devices
1

I am trying to use a AD5061 [1] with an Arduino Due (Arm 3.3v). Same DAC works as intended when using a Uno (atmega 328 5v). I am trying to create analog signal to control a motor driver. Using the following code,

#include

int motorPin = 6;

void sendMotorSPI(int motorPin, int msb, int lsb){
digitalWrite(motorPin, LOW); // select slave (low active)
delayMicroseconds(1);
SPI.transfer(00000000);
SPI.transfer(msb);
SPI.transfer(lsb);
delayMicroseconds(1);
digitalWrite(motorPin, HIGH); //deselect slave (high passive)
}

void setup(){
SPI.setBitOrder(MSBFIRST); //most sign. bit
SPI.setDataMode(SPI_MODE1); // spi mode (must be 1)

pinMode(motorPin, OUTPUT);
digitalWrite(motorPin, HIGH);
}

void loop(){
SPI.begin();

unsigned int value = 100;
value = value << 8;
byte MSB = (value & 0xFF00) >> 8;
byte LSB = 0x00FF & value;

sendMotorSPI(motorPin, MSB, LSB);

while(1);
}

It is connected like the following to the Uno and works as intented,

Pin 6 -> SYNC
Mosi -> Din
SCK -> SCLK

However I can not get it to work on the Due, I suspected 3.3v might be the problem so I used a transistor to push all lines to 5v, but still I can not get it work.

[1] http://www.analog.com/en/products/digital-to-analog-converters/da-converters/ad5061.html