#include "pins_arduino.h"
#include < SPI.h >

#define LDAC   9

void setup() {
     pinMode(LDAC,OUTPUT) ;
     SPI.begin() ;
     SPI.setBitOrder(MSBFIRST) ;
     SPI.setClockDivider(SPI_CLOCK_DIV8) ;
     SPI.setDataMode(SPI_MODE0) ;
}
void loop() {
     int i ;

     for (i=0 ; i < 4096 ; i=i+4) {
          digitalWrite(LDAC,HIGH) ;
          digitalWrite(SS,LOW) ;
          SPI.transfer((i >> 8)|0x30) ;
          SPI.transfer(i & 0xff) ;
          digitalWrite(SS,HIGH) ;
          digitalWrite(LDAC,LOW) ;
     }
}

#define DA_SCK   13
#define DA_SDI   11
#define DA_CS    10
#define DA_LDAC   9

void DACout(int dataPin,int clockPin,int destination,int value)
{
     int i ;

     digitalWrite(dataPin,destination) ;
     digitalWrite(clockPin,HIGH) ;
     digitalWrite(clockPin,LOW) ;
     digitalWrite(dataPin,LOW) ;
     digitalWrite(clockPin,HIGH) ;
     digitalWrite(clockPin,LOW) ;
     digitalWrite(dataPin,HIGH) ;
     digitalWrite(clockPin,HIGH) ;
     digitalWrite(clockPin,LOW) ;
     digitalWrite(dataPin,HIGH) ;
     digitalWrite(clockPin,HIGH) ;
     digitalWrite(clockPin,LOW) ;
     for (i=11 ; i>=0 ; i--) {
          if (((value >> i) & 0x1) == 1) digitalWrite(dataPin,HIGH) ;
          else                           digitalWrite(dataPin,LOW) ;
          digitalWrite(clockPin,HIGH) ;
          digitalWrite(clockPin,LOW) ;
     }
}
void setup() {
     pinMode(DA_SCK, OUTPUT) ;
     pinMode(DA_SDI, OUTPUT) ;
     pinMode(DA_CS,  OUTPUT) ;
     pinMode(DA_LDAC,OUTPUT) ;
     digitalWrite(DA_SCK,LOW) ;
}
void loop() {
   int i=0;
   for(i=0; i<4096; i++){
     digitalWrite(DA_LDAC,HIGH) ;
     digitalWrite(DA_CS,LOW) ;
     DACout(DA_SDI,DA_SCK,0,i) ;
     digitalWrite(DA_CS,HIGH) ;
     digitalWrite(DA_LDAC,LOW) ;
  }
}