Using the Pmod DA3 with Arduino Uno

/************************************************************************
*
* Test of the Pmod
*
*************************************************************************
* Description: Pmod_DA3
* The output voltage of the Pmod will change from 0 to 2.5 V to generate a
* triangular signal.
*
*
* Material
* 1. Arduino Uno
* 2. Pmod DA3 (do not touch JP1 jumper)
*
************************************************************************/

#define CS 10 // affectation of CS pin
#define LDAC 9 // affectation of LDAC pin
#include <SPI.h> // Include library

int i;
int j;

void setup()
{
 Serial.begin(9600); // initialization of serial communication
 SPI.begin(); // initialization of SPI port
 SPI.setDataMode(SPI_MODE0); // configuration communication SPI in mode 0
 SPI.setClockDivider(SPI_CLOCK_DIV16); // configuration of clock at 1MHz
 pinMode(CS, OUTPUT);
 pinMode(LDAC, OUTPUT);
}

void loop()
{
 for (i=0;i<256;i=i+1)
  {
   for (j=0;j<256;j=j+1)
   {
   digitalWrite(LDAC, HIGH); // deactivation of LDAC line
   digitalWrite(CS, LOW); // activation of CS line
   SPI.transfer(i); // send high bits
   SPI.transfer(j); // send low bits
   digitalWrite(CS, HIGH); // deactivation of CS line
   digitalWrite(LDAC, LOW); // activation of LDAC line
   /* Period of signal is eround 2,4 s.
   * If it is desired to increase it, we can introduce a delay at each passage        in the loop
   * delay(1); or delayMicroseconds(50); 
   */
   }
}