Another audio amplifier option.
Double Balanced Mixers
Plessey Bidirectional IF Amplifiers
Mic Amp
RF Power Amp
Low Pass Filters
#include <Wire.h>
#include <SPI.h>
#include <LiquidCrystal_I2C.h>
#include <si5351.h>
const uint32_t band80mStart = 3500000; // start of 80m
const uint32_t band80mEnd = 3900000; // end of 80m
const uint32_t band40mStart = 7000000; // start of 40m
const uint32_t band40mEnd = 7300000; // end of 40m
const uint32_t bandInit = 3700000; // where to initially set the frequency
volatile long oldfreq = 0;
volatile long old80mfreq = 3700000;
volatile long old40mfreq = 7100000;
volatile long currentfreq = 0;
volatile int updatedisplay = 0;
volatile int TX = 0;
volatile int oldTX = 0;
volatile int mode = 0;
volatile int oldmode = 0;
volatile int band = 0;
volatile int oldband = 0;
volatile uint32_t freq = bandInit ; // this is a variable (changes) - set it to the beginning of the band
volatile uint32_t radix = 1000; // how much to change the frequency by, clicking the rotary encoder will change this.
volatile uint32_t SSB_BFO_freq = 8999700; // 8998050 (filter centre) + 2700/2 + 300
//volatile uint32_t SSB_BFO_freq = 9000300; // 8998050 (filter centre) + 2700/2 + 300
volatile uint32_t CW_BFO_freq = 8997336; // 8996750 (filter centre) + 700 - 114 (from test)
static const uint32_t CW_Filter_CentreFreq = 8996750;
// Rotary encoder pins and other inputs
static const int rotAPin = 2;
static const int rotBPin = 3;
static const int pushPin = 4;
// Mode switches
static const int BandPin = 5;
static const int ModePin = 6;
// Discrete Outputs
static const int CrystalFilterSelectPin = 10;
static const int PTTPin = 11;
// Rotary encoder variables, used by interrupt routines
volatile int rotState = 0;
volatile int rotAval = 1;
volatile int rotBval = 1;
// Instantiate the Objects
LiquidCrystal_I2C lcd(0x27, 16, 2);
Si5351 si5351;
void setup()
{
// Set up frequency and radix switches
pinMode(rotAPin, INPUT);
pinMode(rotBPin, INPUT);
pinMode(pushPin, INPUT);
pinMode(ModePin, INPUT);
pinMode(BandPin, INPUT);
pinMode(PTTPin, INPUT);
pinMode(CrystalFilterSelectPin, OUTPUT);
// Set up pull-up resistors on inputs
digitalWrite(rotAPin, HIGH);
digitalWrite(rotBPin, HIGH);
digitalWrite(pushPin, HIGH);
digitalWrite(ModePin, HIGH);
digitalWrite(BandPin, HIGH);
digitalWrite(PTTPin, HIGH);
digitalWrite(CrystalFilterSelectPin, LOW);
// Set up interrupt pins
attachInterrupt(digitalPinToInterrupt(rotAPin), ISRrotAChange, CHANGE);
attachInterrupt(digitalPinToInterrupt(rotBPin), ISRrotBChange, CHANGE);
// Initialize the display
lcd.begin();
lcd.backlight();
lcd.cursor();
UpdateDisplay();
delay(1000);
// Initialize the DDS
si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0);
si5351.set_correction(35980);
si5351.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);
si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_8MA);
si5351.drive_strength(SI5351_CLK2, SI5351_DRIVE_8MA);
// si5351.drive_strength(SI5351_CLK0, SI5351_DRIVE_6MA);
// si5351.drive_strength(SI5351_CLK2, SI5351_DRIVE_6MA); si5351.set_freq((freq * 100ULL), SI5351_PLL_FIXED, SI5351_CLK0);
si5351.set_freq((SSB_BFO_freq * 100ULL), SI5351_PLL_FIXED, SI5351_CLK2);
}
void loop()
{
currentfreq = getfreq(); // Interrupt safe method to get the current frequency
if (currentfreq != oldfreq)
{
UpdateDisplay();
SendFrequency();
oldfreq = currentfreq;
}
if (digitalRead(pushPin) == LOW)
{
delay(10);
while (digitalRead(pushPin) == LOW)
{
if (updatedisplay == 1)
{
UpdateDisplay();
updatedisplay = 0;
}
}
delay(50);
}
if (digitalRead(PTTPin) == HIGH)
TX = 1;
else
TX = 0;
if (digitalRead(ModePin) == LOW)
{
mode = 1; // 0 = LSB, 1 = CW
digitalWrite(CrystalFilterSelectPin, HIGH); // Select CW filter
}
else
{
mode = 0;
digitalWrite(CrystalFilterSelectPin, LOW); // Select SSB filter
}
if (digitalRead(BandPin) == LOW)
band = 1; // 0 = 80m, 1 = 40m
else
band = 0;
if (TX != oldTX) // Only update the display on mode change
{
//UpdateMode();
UpdateDisplay();
oldTX = TX;
}
if (mode != oldmode) // Only update the display on mode change
{
//UpdateMode();
UpdateDisplay();
SendFrequency();
oldmode = mode;
}
if (band != oldband) // Only update the display on band change
{
// 0 = 80m, 1 = 40m
if (band == 0) // now 80m was 40m
{
old40mfreq = freq;
freq = old80mfreq;
}
if (band == 1) // now 40m was 80m
{
old80mfreq = freq;
freq = old40mfreq;
}
UpdateDisplay();
oldband = band;
}
}
long getfreq()
{
long temp_freq;
cli();
temp_freq = freq;
sei();
return temp_freq;
}
// Interrupt routines
void ISRrotAChange()
{
if (digitalRead(rotAPin))
{
rotAval = 1;
UpdateRot();
}
else
{
rotAval = 0;
UpdateRot();
}
}
void ISRrotBChange()
{
if (digitalRead(rotBPin))
{
rotBval = 1;
UpdateRot();
}
else
{
rotBval = 0;
UpdateRot();
}
}
void UpdateRot()
{
switch (rotState)
{
case 0: // Idle state, look for direction
if (!rotBval)
rotState = 1; // CW 1
if (!rotAval)
rotState = 11; // CCW 1
break;
case 1: // CW, wait for A low while B is low
if (!rotBval)
{
if (!rotAval)
{
// either increment radixindex or freq
if (digitalRead(pushPin) == LOW)
{
updatedisplay = 1;
if (radix == 1000000)
radix = 100000;
else if (radix == 100000)
radix = 10000;
else if (radix == 10000)
radix = 1000;
else if (radix == 1000)
radix = 100;
else if (radix == 100)
radix = 10;
else if (radix == 10)
radix = 1;
else
radix = 1000000;
}
else
{
freq = (freq + radix);
if (band == 0) // 80m
if (freq > band80mEnd)
freq = band80mEnd;
if (band == 1) // 80m
if (freq > band40mEnd)
freq = band40mEnd;
}
rotState = 2; // CW 2
}
}
else if (rotAval)
rotState = 0; // It was just a glitch on B, go back to start
break;
case 2: // CW, wait for B high
if (rotBval)
rotState = 3; // CW 3
break;
case 3: // CW, wait for A high
if (rotAval)
rotState = 0; // back to idle (detent) state
break;
case 11: // CCW, wait for B low while A is low
if (!rotAval)
{
if (!rotBval)
{
// either decrement radixindex or freq
if (digitalRead(pushPin) == LOW)
{
updatedisplay = 1;
if (radix == 1)
radix = 10;
else if (radix == 10)
radix = 100;
else if (radix == 100)
radix = 1000;
else if (radix == 1000)
radix = 10000;
else if (radix == 10000)
radix = 100000;
else if (radix == 100000)
radix = 1000000;
else
radix = 1;
}
else
{
freq = (freq - radix);
if (band == 0) // 80m
if (freq < band80mStart)
freq = band80mStart;
if (band == 1) // 80m
if (freq < band40mStart)
freq = band40mStart;
}
rotState = 12; // CCW 2
}
}
else if (rotBval)
rotState = 0; // It was just a glitch on A, go back to start
break;
case 12: // CCW, wait for A high
if (rotAval)
rotState = 13; // CCW 3
break;
case 13: // CCW, wait for B high
if (rotBval)
rotState = 0; // back to idle (detent) state
break;
}
}
void UpdateDisplay()
{
lcd.setCursor(0, 0);
lcd.print(" ");
lcd.setCursor(0, 0);
lcd.print(freq);
lcd.setCursor(10, 0);
lcd.print("ZL2CTM");
lcd.setCursor(0, 1);
lcd.print(" ");
lcd.setCursor(0, 1);
lcd.setCursor(0, 1);
if (mode == 0)
lcd.print("LSB");
if (mode == 1)
lcd.print("CW ");
lcd.setCursor(5, 1);
lcd.print(" ");
lcd.setCursor(5, 1);
if (TX == 1)
lcd.print("TX");
if (freq > 9999999)
{
if (radix == 1)
lcd.setCursor(7, 0);
if (radix == 10)
lcd.setCursor(6, 0);
if (radix == 100)
lcd.setCursor(5, 0);
if (radix == 1000)
lcd.setCursor(4, 0);
if (radix == 10000)
lcd.setCursor(3, 0);
if (radix == 100000)
lcd.setCursor(2, 0);
if (radix == 1000000)
lcd.setCursor(1, 0);
}
if (freq <= 9999999)
{
if (radix == 1)
lcd.setCursor(6, 0);
if (radix == 10)
lcd.setCursor(5, 0);
if (radix == 100)
lcd.setCursor(4, 0);
if (radix == 1000)
lcd.setCursor(3, 0);
if (radix == 10000)
lcd.setCursor(2, 0);
if (radix == 100000)
lcd.setCursor(1, 0);
if (radix == 1000000)
lcd.setCursor(0, 0);
}
}
void SendFrequency()
{
// CW_BFO_freq = 8997336; // 8996750 (filter centre) + 700 - 114 (from test)
// SSB_BFO_freq = 8999700; // 8998050 (filter centre) + 2700/2 + 300
// CW_Filter_CentreFreq = 8996750;
if (mode == 1) // CW
{
si5351.set_freq(((CW_Filter_CentreFreq - freq) * 100ULL), SI5351_PLL_FIXED, SI5351_CLK0);
si5351.set_freq((CW_BFO_freq * 100ULL), SI5351_PLL_FIXED, SI5351_CLK2);
}
else // SSB
{
si5351.set_freq(((SSB_BFO_freq - freq) * 100ULL), SI5351_PLL_FIXED, SI5351_CLK0);
si5351.set_freq((SSB_BFO_freq * 100ULL), SI5351_PLL_FIXED, SI5351_CLK2);
}
}
