【DDS】
このSketchを実行すると、LCDに”DDS　On”　と”DDS　Off”の表示とLEDの点滅が繰り返される。その時に7003.000kHzが発振されている。但し、LCDはSD1602 HULBを使用した。接続に注意。


Sketch


 //      2012/02/28  AD9850/51 DDS-ICのテストプログラム
 // include the library code:
 #include <LiquidCrystal.h>
 // initialize the library with the numbers of the interface pins
 //LiquidCrystal(rs, enable, d4, d5, d6, d7)
 LiquidCrystal lcd(12, 11, 7, 6, 5, 4);
 // Variable
  int ledPin=13;
  int FreqUpdatePin=14;
  int dataLinePin=15;
  int w_ClkPin=16;
  byte ddsCmd= B00000000;      //34.359738368
  byte ddsCmdOff= B00000001;
  //long  ddsData=240518168; //7000000=7000.000kHz
  long  ddsData=240621248; //7003000=7003.000kHz
  long setOff=0;
 
  void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  lcd.home();
  lcd.print("Hello, world!");
  lcd.setCursor(0,1);    //setCursor(x,y)
  lcd.print("JA1NHL");
  pinMode(ledPin,OUTPUT);
  pinMode(FreqUpdatePin,OUTPUT);
  pinMode(dataLinePin,OUTPUT);
  pinMode(w_ClkPin,OUTPUT);
  initializeDds();
 }

void loop() {
   digitalWrite(ledPin,HIGH);
   ddsOutput();
   lcd.clear();
   lcd.print("DDS On");
   delay(2000);
   digitalWrite(ledPin,LOW);
   ddsOutputOff();
   lcd.clear();
   lcd.print("DDS Off");
   delay(1500);  
 }

 void initializeDds(){  
   digitalWrite( dataLinePin,LOW);
   digitalWrite( w_ClkPin,LOW);
   delayMicroseconds(10);
   digitalWrite( w_ClkPin,HIGH);
   delayMicroseconds(10);
   digitalWrite( w_ClkPin,LOW);
   delayMicroseconds(10);
   digitalWrite( FreqUpdatePin,HIGH);
   delayMicroseconds(10);
   digitalWrite( FreqUpdatePin,LOW);
   delayMicroseconds(10);
 }

 void ddsOutput(){
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,ddsData);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,ddsData>>8);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,ddsData>>16);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,ddsData>>24);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,ddsCmd);
   delayMicroseconds(10);
   digitalWrite( FreqUpdatePin,HIGH);
   delayMicroseconds(10);
   digitalWrite( FreqUpdatePin,LOW);
 }

 void ddsOutputOff(){
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,setOff);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,setOff>>8);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,setOff>>16);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,setOff>>24);
   shiftOut( dataLinePin, w_ClkPin, LSBFIRST,ddsCmd);
   delayMicroseconds(10);
   digitalWrite( FreqUpdatePin,HIGH);
   delayMicroseconds(10);
   digitalWrite( FreqUpdatePin,LOW);
 }

/*
  LiquidCrystal Library - display() and noDisplay()

 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the
 Hitachi HD44780 driver. There are many of them out there, and you
 can usually tell them by the 16-pin interface.
  This sketch prints "Hello World!" to the LCD and uses the
 display() and noDisplay() functions to turn on and off
 the display.

 The circuit:
 * LCD RS pin(pin 4) to digital pin 12
 * LCD Enable pin(pin 6) to digital pin 11
 * LCD D4 pin(pin 11)to digital pin 7
 * LCD D5 pin(pin 12) to digital pin 6
 * LCD D6 pin(pin 13) to digital pin 5
 * LCD D7 pin(pin 14) to digital pin 4
 * LCD R/W pin(pin 5) to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)

 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 */

【画像】　

LCDの画面

IC-7400の受信画面

  

発振した時の LCD 画面

IC-7400で受信した画面