Descrição

Gerador de clock Si5351A ! Este módulo foi construido especialmente para trabalhar sobre o Arduino Pro Mini ,nada impede de usar qualquer outra versão de placa .Usa se um cristal de 25MHz ou 27MHz , PLL interno e divisores para que possa gerar praticamente qualquer freqüência, de <8KHz até 150+ MHz.
O DDS Si5351A é um gerador de clock controlado I2C. Ele usa o clock para acionar vários PLLs e divisores , usando instruções I2C. Ao configurar o PLL e os divisores, você pode criar frequências precisas e arbitrárias. Existem três saídas independentes e cada uma pode ter uma frequência diferente.

Exemplo de esquema

Exemplo de código

Si5351_VFO.ino

Si5351 VFO

By LA3PNA 27 March 2015

Modified by NT7S 25 April 2015

Modified to be Si5351 Arduino v2 compliant by NT7S 21 Nov 2016

This version uses the new version of the Si5351 library from NT7S.

see: http://arduino.cc/en/Reference/AttachInterrupt for what pins that have interrupts.

UNO and 328 boards: Encoder on pin 2 and 3. Center pin to GND.

Leonardo: Encoder on pin 0 and 1. Center pin to GND.

100nF from each of the encoder pins to gnd is used to debounce

The pushbutton goes to pin 11 to set the tuning rate.

Pin 12 is the RX/TX pin. Put this pin LOW for RX, open or high for TX.

Single transistor switch to +RX will work.

VFO will NOT tune in TX.

LCD connections for for the LinkSprite 16 X 2 LCD Keypad Shield for Arduino.

Change as necessary for your LCD.

IF frequency is positive for sum product (IF = RF + LO) and negative for diff (IF = RF - LO)

VFO signal output on CLK0, BFO signal on CLK2

// Only leave one uncommented for the display you wish to use

#define OLED

//#define LCD

#include <si5351.h>

#include "Wire.h"

// Conditional includes based on which display is defined above

#if defined(LCD)

#include <LiquidCrystal.h>

LiquidCrystal lcd( 8, 9, 4, 5, 6, 7 );

#endif

#if defined(OLED)

#include "U8glib.h"

U8GLIB_SSD1306_128X64_2X u8g(U8G_I2C_OPT_NONE); // I2C / TWI

#endif

// Class instantiation

Si5351 si5351;

// interrupt service routine vars

boolean A_set = false;

boolean B_set = false;

volatile unsigned long frequency = 7100000UL; // This will be the frequency it always starts on.

volatile int tx;

unsigned long iffreq = 0; // set the IF frequency in Hz.

const unsigned long freqstep[] = {50, 100, 500, 1000, 5000, 10000}; // set this to your wanted tuning rate in Hz.

int corr = 0; // this is the correction factor for the Si5351, use calibration sketch to find value.

unsigned int lastReportedPos = 1; // change management

static boolean rotating = false; // debounce management

int inData;

int txpin = 12;

int freqsteps = 1;

int stepbutton = 11;

#define arraylength (sizeof(freqstep) / sizeof(freqstep[0]))

// Define hardware pins based on platform

#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega16U4__)

int encoderPinA = 0; // right

int encoderPinB = 1; // left

#endif

#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)

int encoderPinA = 2; // right

int encoderPinB = 3; // left

#endif

// Interrupt on A changing state

void doEncoderA()

{

// debounce

if (rotating) delay (1); // wait a little until the bouncing is done

// Test transition, did things really change?

if (digitalRead(encoderPinA) != A_set) { // debounce once more

A_set = !A_set;

// adjust counter + if A leads B

if (A_set && !B_set) {

if (!tx) {

frequency += freqstep[freqsteps]; // hehre is the amount to increase the freq

}

rotating = false; // no more debouncing until loop() hits again

}

// Interrupt on B changing state, same as A above

void doEncoderB()

{

if (rotating) delay (1);

if (digitalRead(encoderPinB) != B_set) {

B_set = !B_set;

// adjust counter - 1 if B leads A

if (B_set && !A_set) {

if (!tx) {

frequency -= freqstep[freqsteps]; // here is the amount to decrease the freq

}

rotating = false;

}

void sprintf_seperated(char *str, unsigned long num)

{

// We will print out the frequency as a fixed length string and pad if less than 100s of MHz

char temp_str[6];

int zero_pad = 0;

// MHz

if(num / 1000000UL > 0)

{

sprintf(str, "%3lu", num / 1000000UL);

zero_pad = 1;

}

else

{

strcat(str, " ");

}

num %= 1000000UL;

// kHz

if(zero_pad == 1)

{

sprintf(temp_str, ",%03lu", num / 1000UL);

strcat(str, temp_str);

}

else if(num / 1000UL > 0)

{

sprintf(temp_str, ",%3lu", num / 1000UL);

strcat(str, temp_str);

zero_pad = 1;

}

else

{

strcat(str, " ");

}

num %= 1000UL;

// Hz

if(zero_pad == 1)

{

sprintf(temp_str, ",%03lu", num);

strcat(str, temp_str);

}

else

{

sprintf(temp_str, ",%3lu", num);

strcat(str, temp_str);

}

strcat(str, " MHz");

}

#if defined(OLED)

void draw_oled(void)

{

char temp_str[21];

u8g.setFont(u8g_font_unifont);

//u8g.setFont(u8g_font_helvR12);

sprintf_seperated(temp_str, frequency);

u8g.drawStr(0, 32, temp_str);

u8g.setFont(u8g_font_unifont);

sprintf(temp_str, "Step: %5u", freqstep[freqsteps]);

u8g.drawStr(0, 56, temp_str);

}

#endif

#if defined(LCD)

void draw_lcd(void)

{

char temp_str[21];

sprintf_seperated(temp_str, frequency);

lcd.setCursor(0, 0);

lcd.print(temp_str);

lcd.setCursor(6, 1);

sprintf(temp_str, "%5u", freqstep[freqsteps]);

lcd.print(temp_str);

}

#endif

void setup()

{

Serial.begin(9600);

// Set GPIO

pinMode(encoderPinA, INPUT);

pinMode(encoderPinB, INPUT);

pinMode(stepbutton, INPUT);

pinMode(txpin, INPUT);

// Turn on pullup resistors

digitalWrite(encoderPinA, HIGH);

digitalWrite(encoderPinB, HIGH);

digitalWrite(stepbutton, HIGH);

digitalWrite(txpin, HIGH);

#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega16U4__)

//Code in here will only be compiled if an Arduino Leonardo is used.

// encoder pin on interrupt 0 (pin 0)

attachInterrupt(0, doEncoderA, CHANGE);

// encoder pin on interrupt 1 (pin 1)

attachInterrupt(1, doEncoderB, CHANGE);

#endif

#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)

//Code in here will only be compiled if an Arduino Uno (or older) is used.

// encoder pin on interrupt 0 (pin 2)

attachInterrupt(0, doEncoderA, CHANGE);

// encoder pin on interrupt 1 (pin 3)

attachInterrupt(1, doEncoderB, CHANGE);

#endif

// Initialize the display

#if defined(LCD)

lcd.begin(16, 2);

lcd.print("Si5351 VFO");

delay(2000);

lcd.clear();

lcd.setCursor(0, 1);

lcd.print("Step: ");

#endif

#if defined(OLED)

//U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE); // I2C / TWI

// Assign default color value

if (u8g.getMode() == U8G_MODE_R3G3B2)

{

u8g.setColorIndex(255); // white

}

else if (u8g.getMode() == U8G_MODE_GRAY2BIT)

{

u8g.setColorIndex(3); // max intensity

}

else if (u8g.getMode() == U8G_MODE_BW)

{

u8g.setColorIndex(1); // pixel on

}

else if (u8g.getMode() == U8G_MODE_HICOLOR)

{

u8g.setHiColorByRGB(255,255,255);

}

#endif

si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0, corr);

si5351.set_freq((frequency + iffreq) * 100ULL, SI5351_CLK0);

si5351.set_freq(iffreq * 100ULL, SI5351_CLK2);

}

void loop()

{

if(digitalRead(txpin))

{

tx = 0;

}

else

{

tx = 1;

}

rotating = true; // reset the debouncer

if (lastReportedPos != frequency)

{

lastReportedPos = frequency;

// Handle LCD

#if defined(LCD)

draw_lcd();

#endif

si5351.set_freq((frequency + iffreq) * 100ULL, SI5351_CLK0);

}

// Handle OLED

#if defined(OLED)

u8g.firstPage();

{

draw_oled();

} while(u8g.nextPage());

delay(50);

#endif

if (Serial.available() > 0) // see if incoming serial data:

{

inData = Serial.read(); // read oldest byte in serial buffer:

}

if (inData == 'F')

{

frequency = Serial.parseInt();

inData = 0;

}

if (digitalRead(stepbutton) == LOW )

{

delay(50); // delay to debounce

if (digitalRead(stepbutton) == LOW )

{

freqsteps = freqsteps + 1;

if (freqsteps > arraylength - 1 )

{

freqsteps = 0;

}

delay(50); //delay to avoid many steps at one

}

}

Forte 73

Si 5351A DDS Gerador de frequência

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sábado, 22 de setembro de 2018

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