Hello group. First time posting here and a total newbie. I am having some issues with the code listed below.
I am hoping they are easy answers for ya all. 
Loading the code into Nano worked ok but the version of code that saves the last freq used, into eeprom does not.
Changing the 1 to 0 makes the nano go wacky.
"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!"
Apparently it has something to do with interrupts and there was a fix posted on the blog.
As follows:
"I don’t have a full sketch but I can tell you the main item you need to adjust is the interrupt.
The Nano uses different interrupt pin assignments.
Your problem is here:
PCICR |= (1 << PCIE2);
PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
I think you move it to 8 and 9 if I remember correctly.
Rich
AD7C"
I am not exactly sure what to do here.
Next, I have a LCD module I bought that came with a I2C interface module attached.
Apparently you can use the LCD Module with I2C, thus freeing up some pins on the controller.
Here is the fix that was posted:
"Nicolo, did you have succes with I2C display?
If not, do the following:
Connect MF freq. shift to A1 instead of A5
A4 is SDA for I2C
A5 is SCL for I2C
Obviously you don’t need the wiring from Arduino D4,5,6,7 an D12,13
Don’t forget to change the assignment for A5 to A1
Cheers,
Gerard"
I am not exactly sure what to do here.
here is the line in code that defines the lcd.
"LiquidCrystal lcd(12, 13, 7, 6, 5, 4); // I used an odd pin combination because I need pin 2 and 3 for the interrupts."
Do I just remove (12, 13, 7, 6, 5, 4) and replace it with (A4, A5) and also redefine A5 to A1?
Since I am an absolute beginner to coding, I am a little confused about how to implement these fixes.
I am hoping it is an easy question for someone to help me with.
Once I get to a point where I can easily understand the code,
I plan do some changes and add some functionality, if it will fit.
Thanks in advance
/*
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=6955000; // 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);
PCICR |= (1 << PCIE2);
PCMSK2 |= (1 << PCINT18) | (1 << PCINT19);
sei();
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();
}
}
}
ISR(PCINT2_vect) {
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 = 0; // Let program know memory has been written
};
