AD9833_ver1.ino

#include <SPI.h>

const int SINE = 0x2000;
const int SQUARE = 0x2028;
const int TRAIANGLE = 0x2002;
const float refFreq = 25000000.0;
const int FSYNC = 10;
const int SWpin = 4;

int waveType = TRAIANGLE;
unsigned long freq = 1000000;
int SW = 0;
int freqPin = A3;
int val = 0;
float val2 = 0;
float tmp = 0;

void setup() {
  Serial.begin(9600);
  Serial.println("AD9833 Test");
  pinMode(SWpin, INPUT);

  SPI.begin();
  delay(50);

  AD9833reset();
  delay(50);
  AD9833setFrequency(freq, SINE);
}

void loop() {

  val = digitalRead(SWpin);
  val2 = analogRead(freqPin);
  //Serial.println(val);
  Serial.println(int(val2/10)*10);

 
  
  tmp = 100*float(int(val2/10)*10);
  Serial.println(tmp);
  

  if ((val != SW)|(freq != tmp)){
    SW = val;
    freq = tmp;
    if(SW == 0){
      AD9833reset();
      delay(50);
      AD9833setFrequency(freq, TRAIANGLE);
      Serial.println("TRAIANGLE");
    } else {
      AD9833reset();
      delay(50);
      AD9833setFrequency(freq, SINE);
      Serial.println("SINE");
    }
  }
  
  delay(100);
  
}

void AD9833reset() {
  WriteRegister(0x100);
  delay(10);
}

void AD9833setFrequency(long frequency, int Waveform) {
  long FreqWord = (frequency * pow(2, 28)) / refFreq;

  int MSB = (int)((FreqWord & 0xFFFC000) >> 14);
  int LSB = (int)(FreqWord & 0x3FFF);

  LSB |= 0x4000;
  MSB |= 0x4000;

  WriteRegister(0x2100);
  WriteRegister(LSB);
  WriteRegister(MSB);
  WriteRegister(0xC000);
  WriteRegister(Waveform);
}

void WriteRegister(int dat) {
  SPI.setDataMode(SPI_MODE2);

  digitalWrite(FSYNC, LOW);
  delayMicroseconds(10);

  SPI.transfer(highByte(dat));
  SPI.transfer(lowByte(dat));

  digitalWrite(FSYNC, HIGH);
}