DDS AD9833をArduinoで使い正弦波を出力する。

プログラマブル波形発生器「AD9833」による三角波/サイン波の発生より、接続は以下

【Arduino Uno R3】　　【AD9833】
      5V          ⇔     Vcc
      GND         ⇔     DGND
      SCK(#13)　  ⇔     SCLK
      MOSI(#11)   ⇔     SDATA
      SS(#10)     ⇔     FSYNC

/*
AD9833 Waveform Module vwlowen.co.uk
*/
 
#include <SPI.h>
 
const int SINE = 0x2000;                    // Define AD9833's waveform register value.
const int SQUARE = 0x2028;                  // When we update the frequency, we need to
const int TRIANGLE = 0x2002;                // define the waveform when we end writing.    
const float refFreq = 25000000.0;           // On-board crystal reference frequency
const int FSYNC = 10;                       // Standard SPI pins for the AD9833 waveform generator.
 
int waveType = TRIANGLE;
unsigned long freq = 2000;               // Set initial frequency.
 
void setup() { 
  Serial.begin(9600);
  Serial.println("AD9833 Test");
 
   
  // Can't set SPI MODE here because the display and the AD9833 use different MODES.
  SPI.begin();
  delay(50); 
   
  AD9833reset();                                   // Reset AD9833 module after power-up.
  delay(50);
  AD9833setFrequency(freq, TRIANGLE);                  // Set the frequency and Sine Wave output
}
 
 
void loop() {
 
}
 
// AD9833 documentation advises a 'Reset' on first applying power.
void AD9833reset() {
  WriteRegister(0x100);   // Write '1' to AD9833 Control register bit D8.
  delay(10);
}
 
// Set the frequency and waveform registers in the AD9833.
void AD9833setFrequency(long frequency, int Waveform) {
 
  long FreqWord = (frequency * pow(2, 28)) / refFreq;
 
  int MSB = (int)((FreqWord & 0xFFFC000) >> 14);    //Only lower 14 bits are used for data
  int LSB = (int)(FreqWord & 0x3FFF);
   
  //Set control bits 15 ande 14 to 0 and 1, respectively, for frequency register 0
  LSB |= 0x4000;
  MSB |= 0x4000; 
   
  WriteRegister(0x2100);   
  WriteRegister(LSB);                  // Write lower 16 bits to AD9833 registers
  WriteRegister(MSB);                  // Write upper 16 bits to AD9833 registers.
  WriteRegister(0xC000);               // Phase register
  WriteRegister(Waveform);             // Exit & Reset to SINE, SQUARE or TRIANGLE
 
}
 
void WriteRegister(int dat) { 
   
  // Display and AD9833 use different SPI MODES so it has to be set for the AD9833 here.
  SPI.setDataMode(SPI_MODE2);       
   
  digitalWrite(FSYNC, LOW);           // Set FSYNC low before writing to AD9833 registers
  delayMicroseconds(10);              // Give AD9833 time to get ready to receive data.
   
  SPI.transfer(highByte(dat));        // Each AD9833 register is 32 bits wide and each 16
  SPI.transfer(lowByte(dat));         // bits has to be transferred as 2 x 8-bit bytes.
 
  digitalWrite(FSYNC, HIGH);          //Write done. Set FSYNC high
}

AD9833波形発生器をArduinoで使う　こちらではgithubのソースが紹介されている。