Also, here is the code that worked or my Arduino Mega

/*
Main code by Richard Visokey AD7C - www.ad7c.com
Revision 2.0 - November 6th, 2013
*/

// Include the library code
#include <LiquidCrystal.h>
#include <rotary.h>
#include <EEPROM.h>

//Setup some items
#define W_CLK 8?? // Pin 8 - connect to AD9850 module word load clock pin (CLK)
#define FQ_UD 9?? // Pin 9 - connect to freq update pin (FQ)
#define DATA 10?? // Pin 10 - connect to serial data load pin (DATA)
#define RESET 11? // Pin 11 - connect to reset pin (RST)
#define pulseHigh(pin) {digitalWrite(pin, HIGH); digitalWrite(pin, LOW); }
Rotary r = Rotary(2,3); // sets the pins the rotary encoder uses.? Must be interrupt pins.
LiquidCrystal lcd(12, 13, 7, 6, 5, 4); // I used an odd pin combination because I need pin 2 and 3 for the interrupts.
int_fast32_t rx=7200000; // Starting frequency of VFO
int_fast32_t rx2=1; // variable to hold the updated frequency
int_fast32_t increment = 10; // starting VFO update increment in HZ.
int buttonstate = 0;
String hertz = "10 Hz";
int? hertzPosition = 5;
byte ones,tens,hundreds,thousands,tenthousands,hundredthousands,millions ;? //Placeholders
String freq; // string to hold the frequency
int_fast32_t timepassed = millis(); // int to hold the arduino miilis since startup
int memstatus = 1;? // value to notify if memory is current or old. 0=old, 1=current.





int ForceFreq = 1;? // Change this to 0 after you upload and run a working sketch to activate the EEPROM memory.? YOU MUST PUT THIS BACK TO 0 AND UPLOAD THE SKETCH AGAIN AFTER STARTING FREQUENCY IS SET!




void setup() {
? pinMode(A0,INPUT); // Connect to a button that goes to GND on push
? digitalWrite(A0,HIGH);
? lcd.begin(16, 2);
? attachInterrupt(0,MyIsr,CHANGE);
attachInterrupt(1,MyIsr,CHANGE);
?
? pinMode(FQ_UD, OUTPUT);
? pinMode(W_CLK, OUTPUT);
? pinMode(DATA, OUTPUT);
? pinMode(RESET, OUTPUT);
? pulseHigh(RESET);
? pulseHigh(W_CLK);
? pulseHigh(FQ_UD);? // this pulse enables serial mode on the AD9850 - Datasheet page 12.
? lcd.setCursor(hertzPosition,1);???
? lcd.print(hertz);
?? // Load the stored frequency?
? if (ForceFreq == 0) {
??? freq = String(EEPROM.read(0))+String(EEPROM.read(1))+String(EEPROM.read(2))+String(EEPROM.read(3))+String(EEPROM.read(4))+String(EEPROM.read(5))+String(EEPROM.read(6));
??? rx = freq.toInt();?
? }
}


void loop() {
? if (rx != rx2){???
??????? showFreq();
??????? sendFrequency(rx);
??????? rx2 = rx;
????? }
?????
? buttonstate = digitalRead(A0);
? if(buttonstate == LOW) {
??????? setincrement();???????
??? };

? // Write the frequency to memory if not stored and 2 seconds have passed since the last frequency change.
??? if(memstatus == 0){??
????? if(timepassed+2000 < millis()){
??????? storeMEM();
??????? }
????? }??
}


void MyIsr(void) {
? unsigned char result = r.process();
? if (result) {???
??? if (result == DIR_CW){rx=rx+increment;}
??? else {rx=rx-increment;};??????
????? if (rx >=30000000){rx=rx2;}; // UPPER VFO LIMIT
????? if (rx <=1000000){rx=rx2;}; // LOWER VFO LIMIT
? }
}



// frequency calc from datasheet page 8 = <sys clock> * <frequency tuning word>/2^32
void sendFrequency(double frequency) {?
? int32_t freq = frequency * 4294967295/125000000;? // note 125 MHz clock on 9850.? You can make 'slight' tuning variations here by adjusting the clock frequency.
? for (int b=0; b<4; b++, freq>>=8) {
??? tfr_byte(freq & 0xFF);
? }
? tfr_byte(0x000);?? // Final control byte, all 0 for 9850 chip
? pulseHigh(FQ_UD);? // Done!? Should see output
}
// transfers a byte, a bit at a time, LSB first to the 9850 via serial DATA line
void tfr_byte(byte data)
{
? for (int i=0; i<8; i++, data>>=1) {
??? digitalWrite(DATA, data & 0x01);
??? pulseHigh(W_CLK);?? //after each bit sent, CLK is pulsed high
? }
}

void setincrement(){
? if(increment == 10){increment = 50; hertz = "50 Hz"; hertzPosition=5;}
? else if (increment == 50){increment = 100;? hertz = "100 Hz"; hertzPosition=4;}
? else if (increment == 100){increment = 500; hertz="500 Hz"; hertzPosition=4;}
? else if (increment == 500){increment = 1000; hertz="1 Khz"; hertzPosition=6;}
? else if (increment == 1000){increment = 2500; hertz="2.5 Khz"; hertzPosition=4;}
? else if (increment == 2500){increment = 5000; hertz="5 Khz"; hertzPosition=6;}
? else if (increment == 5000){increment = 10000; hertz="10 Khz"; hertzPosition=5;}
? else if (increment == 10000){increment = 100000; hertz="100 Khz"; hertzPosition=4;}
? else if (increment == 100000){increment = 1000000; hertz="1 Mhz"; hertzPosition=6;}?
? else{increment = 10; hertz = "10 Hz"; hertzPosition=5;};?
?? lcd.setCursor(0,1);
?? lcd.print("??????????????? ");
?? lcd.setCursor(hertzPosition,1);
?? lcd.print(hertz);
?? delay(250); // Adjust this delay to speed up/slow down the button menu scroll speed.
};

void showFreq(){
??? millions = int(rx/1000000);
??? hundredthousands = ((rx/100000)%10);
??? tenthousands = ((rx/10000)%10);
??? thousands = ((rx/1000)%10);
??? hundreds = ((rx/100)%10);
??? tens = ((rx/10)%10);
??? ones = ((rx/1)%10);
??? lcd.setCursor(0,0);
??? lcd.print("??????????????? ");
?? if (millions > 9){lcd.setCursor(1,0);}
?? else{lcd.setCursor(2,0);}
??? lcd.print(millions);
??? lcd.print(".");
??? lcd.print(hundredthousands);
??? lcd.print(tenthousands);
??? lcd.print(thousands);
??? lcd.print(".");
??? lcd.print(hundreds);
??? lcd.print(tens);
??? lcd.print(ones);
??? lcd.print(" Mhz? ");
??? timepassed = millis();
??? memstatus = 0; // Trigger memory write
};

void storeMEM(){
? //Write each frequency section to a EPROM slot.? Yes, it's cheating but it works!
?? EEPROM.write(0,millions);
?? EEPROM.write(1,hundredthousands);
?? EEPROM.write(2,tenthousands);
?? EEPROM.write(3,thousands);
?? EEPROM.write(4,hundreds);??????
?? EEPROM.write(5,tens);
?? EEPROM.write(6,ones);??
?? memstatus = 1;? // Let program know memory has been written
};

Also, here is the code that worked or my Arduino Mega

/*
Main code by Richard Visokey AD7C - www.ad7c.com
Revision 2.0 - November 6th, 2013
*/

// Include the library code
#include <LiquidCrystal.h>
#include <rotary.h>
#include <EEPROM.h>

//Setup some items
#define W_CLK 8?? // Pin 8 - connect to AD9850 module word load clock pin (CLK)
#define FQ_UD 9?? // Pin 9 - connect to freq update pin (FQ)
#define DATA 10?? // Pin 10 - connect to serial data load pin (DATA)
#define RESET 11? // Pin 11 - connect to reset pin (RST)
#define pulseHigh(pin) {digitalWrite(pin, HIGH); digitalWrite(pin, LOW); }
Rotary r = Rotary(2,3); // sets the pins the rotary encoder uses.? Must be interrupt pins.
LiquidCrystal lcd(12, 13, 7, 6, 5, 4); // I used an odd pin combination because I need pin 2 and 3 for the interrupts.
int_fast32_t rx=7200000; // Starting frequency of VFO
int_fast32_t rx2=1; // variable to hold the updated frequency
int_fast32_t increment = 10; // starting VFO update increment in HZ.
int buttonstate = 0;
String hertz = "10 Hz";
int? hertzPosition = 5;
byte ones,tens,hundreds,thousands,tenthousands,hundredthousands,millions ;? //Placeholders
String freq; // string to hold the frequency
int_fast32_t timepassed = millis(); // int to hold the arduino miilis since startup
int memstatus = 1;? // value to notify if memory is current or old. 0=old, 1=current.





int ForceFreq = 1;? // Change this to 0 after you upload and run a working sketch to activate the EEPROM memory.? YOU MUST PUT THIS BACK TO 0 AND UPLOAD THE SKETCH AGAIN AFTER STARTING FREQUENCY IS SET!




void setup() {
? pinMode(A0,INPUT); // Connect to a button that goes to GND on push
? digitalWrite(A0,HIGH);
? lcd.begin(16, 2);
? attachInterrupt(0,MyIsr,CHANGE);
attachInterrupt(1,MyIsr,CHANGE);
?
? pinMode(FQ_UD, OUTPUT);
? pinMode(W_CLK, OUTPUT);
? pinMode(DATA, OUTPUT);
? pinMode(RESET, OUTPUT);
? pulseHigh(RESET);
? pulseHigh(W_CLK);
? pulseHigh(FQ_UD);? // this pulse enables serial mode on the AD9850 - Datasheet page 12.
? lcd.setCursor(hertzPosition,1);???
? lcd.print(hertz);
?? // Load the stored frequency?
? if (ForceFreq == 0) {
??? freq = String(EEPROM.read(0))+String(EEPROM.read(1))+String(EEPROM.read(2))+String(EEPROM.read(3))+String(EEPROM.read(4))+String(EEPROM.read(5))+String(EEPROM.read(6));
??? rx = freq.toInt();?
? }
}


void loop() {
? if (rx != rx2){???
??????? showFreq();
??????? sendFrequency(rx);
??????? rx2 = rx;
????? }
?????
? buttonstate = digitalRead(A0);
? if(buttonstate == LOW) {
??????? setincrement();???????
??? };

? // Write the frequency to memory if not stored and 2 seconds have passed since the last frequency change.
??? if(memstatus == 0){??
????? if(timepassed+2000 < millis()){
??????? storeMEM();
??????? }
????? }??
}


void MyIsr(void) {
? unsigned char result = r.process();
? if (result) {???
??? if (result == DIR_CW){rx=rx+increment;}
??? else {rx=rx-increment;};??????
????? if (rx >=30000000){rx=rx2;}; // UPPER VFO LIMIT
????? if (rx <=1000000){rx=rx2;}; // LOWER VFO LIMIT
? }
}



// frequency calc from datasheet page 8 = <sys clock> * <frequency tuning word>/2^32
void sendFrequency(double frequency) {?
? int32_t freq = frequency * 4294967295/125000000;? // note 125 MHz clock on 9850.? You can make 'slight' tuning variations here by adjusting the clock frequency.
? for (int b=0; b<4; b++, freq>>=8) {
??? tfr_byte(freq & 0xFF);
? }
? tfr_byte(0x000);?? // Final control byte, all 0 for 9850 chip
? pulseHigh(FQ_UD);? // Done!? Should see output
}
// transfers a byte, a bit at a time, LSB first to the 9850 via serial DATA line
void tfr_byte(byte data)
{
? for (int i=0; i<8; i++, data>>=1) {
??? digitalWrite(DATA, data & 0x01);
??? pulseHigh(W_CLK);?? //after each bit sent, CLK is pulsed high
? }
}

void setincrement(){
? if(increment == 10){increment = 50; hertz = "50 Hz"; hertzPosition=5;}
? else if (increment == 50){increment = 100;? hertz = "100 Hz"; hertzPosition=4;}
? else if (increment == 100){increment = 500; hertz="500 Hz"; hertzPosition=4;}
? else if (increment == 500){increment = 1000; hertz="1 Khz"; hertzPosition=6;}
? else if (increment == 1000){increment = 2500; hertz="2.5 Khz"; hertzPosition=4;}
? else if (increment == 2500){increment = 5000; hertz="5 Khz"; hertzPosition=6;}
? else if (increment == 5000){increment = 10000; hertz="10 Khz"; hertzPosition=5;}
? else if (increment == 10000){increment = 100000; hertz="100 Khz"; hertzPosition=4;}
? else if (increment == 100000){increment = 1000000; hertz="1 Mhz"; hertzPosition=6;}?
? else{increment = 10; hertz = "10 Hz"; hertzPosition=5;};?
?? lcd.setCursor(0,1);
?? lcd.print("??????????????? ");
?? lcd.setCursor(hertzPosition,1);
?? lcd.print(hertz);
?? delay(250); // Adjust this delay to speed up/slow down the button menu scroll speed.
};

void showFreq(){
??? millions = int(rx/1000000);
??? hundredthousands = ((rx/100000)%10);
??? tenthousands = ((rx/10000)%10);
??? thousands = ((rx/1000)%10);
??? hundreds = ((rx/100)%10);
??? tens = ((rx/10)%10);
??? ones = ((rx/1)%10);
??? lcd.setCursor(0,0);
??? lcd.print("??????????????? ");
?? if (millions > 9){lcd.setCursor(1,0);}
?? else{lcd.setCursor(2,0);}
??? lcd.print(millions);
??? lcd.print(".");
??? lcd.print(hundredthousands);
??? lcd.print(tenthousands);
??? lcd.print(thousands);
??? lcd.print(".");
??? lcd.print(hundreds);
??? lcd.print(tens);
??? lcd.print(ones);
??? lcd.print(" Mhz? ");
??? timepassed = millis();
??? memstatus = 0; // Trigger memory write
};

void storeMEM(){
? //Write each frequency section to a EPROM slot.? Yes, it's cheating but it works!
?? EEPROM.write(0,millions);
?? EEPROM.write(1,hundredthousands);
?? EEPROM.write(2,tenthousands);
?? EEPROM.write(3,thousands);
?? EEPROM.write(4,hundreds);??????
?? EEPROM.write(5,tens);
?? EEPROM.write(6,ones);??
?? memstatus = 1;? // Let program know memory has been written
};