dfannin / adf4351 Goto Github PK

Hi, I am wondering if the criteria for choosing the value of prescaler should be "if( freq > (3600000000UL/outdiv) )" instead.

Hi, I have a board with 25MHz oscillator.
I tried to modify the settings according to another issue here, but I always get setf error.
Can you help me?

Somewhat of a noob at copying in libraries and other code beside the example sketches. I thought I had followed the instructions but am getting the errors below when I attempt to compile the example4351 sketch. Changed my username to xxxxx but other than that just copy/pasted the text from the Arduino IDE.

Any help would be greatly appreciated.

Arduino: 1.8.16 (Mac OS X), Board: "Adafruit Feather M4 Express (SAMD51), Enabled, 120 MHz (standard), Small (-Os) (standard), 50 MHz (standard), Arduino, Off"

/Users/xxxxx/Documents/Arduino/libraries/adf4351-master/src/adf4351.cpp: In constructor 'ADF4351::ADF4351(byte, uint8_t, long unsigned int, uint8_t)':
/Users/xxxxx/Documents/Arduino/libraries/adf4351-master/src/adf4351.cpp:94:37: error: invalid conversion from 'uint8_t' {aka 'unsigned char'} to 'BitOrder' [-fpermissive]
94 | spi_settings = SPISettings(speed, order, mode) ;
| ^~~~~
| |
| uint8_t {aka unsigned char}
In file included from /Users/xxxxx/Documents/Arduino/libraries/adf4351-master/src/adf4351.h:12,
from /Users/xxxxx/Documents/Arduino/libraries/adf4351-master/src/adf4351.cpp:51:
/Users/xxxxx/Library/Arduino15/packages/adafruit/hardware/samd/1.7.5/libraries/SPI/SPI.h:66:40: note: initializing argument 2 of 'SPISettings::SPISettings(uint32_t, BitOrder, uint8_t)'
66 | SPISettings(uint32_t clock, BitOrder bitOrder, uint8_t dataMode) {
| ~~~~~~~~~^~~~~~~~
/Users/xxxxx/Documents/Arduino/libraries/adf4351-master/src/adf4351.cpp: In member function 'int ADF4351::setf(uint32_t)':
/Users/xxxxx/Documents/Arduino/libraries/adf4351-master/src/adf4351.cpp:156:3: error: 'dtostrf' was not declared in this scope
156 | dtostrf(PFDFreq, cntdigits + 8 , 3, tmpstr) ;
| ^~~~~~~
exit status 1
Error compiling for board Adafruit Feather M4 Express (SAMD51).

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

I have been working with your library and a chinese ADF4351 board which has onboard 100 Mhz crystal oscillator. I was able to set it to 2.401Ghz and the lock led lights up but when I try to set it to 2.4Ghz I get error mod out of range. When I set the ref freq to 10Mhz there is no mod error but the lock led does not light up and I think it is because there is onboard 100Mhz crystal. So since I have a 100 Mhz crystal and your library appears to work well with 10Mhz ref freq coded in, what shall I do? Is it possible that even after setting the ref freq to 100 Mhz I do not get a mod error and that I can set it to 2.4Ghz as well? Is there anything that I need to change in the code like vfo.ClkDiv = 150 ; vfo.BandSelClock = 80 ; to values other than you mentioned? Please let me know.

Hi, I am currently using your library for the ADF4351 chip with arduino uno. My ADF4351 board has a reference clock at 25 Mhz. I change the example code to generate 40 Mhz, Here is the main code file:

#include <Arduino.h>
#include "adf4351.h"

#define SWVERSION "1.0"

#define PIN_SS 9  ///< SPI slave select pin, default value

ADF4351  vfo(PIN_SS, SPI_MODE0, 1000000UL , MSBFIRST) ;
void setup()
{
  Serial.begin(9600) ;
  Serial.print("Hello adf4351 demo v") ;
  Serial.println(SWVERSION) ;
  Wire.begin() ;
  /*!
     setup the chip (for a 10 mhz ref freq)
     most of these are defaults
  */
  vfo.pwrlevel = 0 ; ///< sets to -4 dBm output
  vfo.RD2refdouble = 0 ; ///< ref doubler off
  vfo.RD1Rdiv2 = 0 ;   ///< ref divider off
  vfo.ClkDiv = 150 ;
  vfo.BandSelClock = 80 ;
  vfo.RCounter = 1 ;  ///< R counter to 1 (no division)
  vfo.ChanStep = steps[4] ;  ///< set to 100 kHz steps

  /*!
     sets the reference frequency to 10 Mhz
  */
  if ( vfo.setrf(25000000UL) ==  0 )
    Serial.println("ref freq set to 10 Mhz") ;
    else
      Serial.println("ref freq set error") ;
      /*!
         initialize the chip
      */
      vfo.init() ;

  /*!
     enable frequency output
  */
  vfo.enable() ;
}
void loop()
{
  /*!
     do a set of freq changes (40 Mhz, 4 GHz, and 1Ghz, )
  */
  vfo.disable();
  delay(2000);
  Serial.println("setf() to 40 MHz") ;

  if ( vfo.setf(40000000UL) == 0 ) {
    Serial.print("setf() success freq:") ;
    Serial.println(vfo.cfreq) ;
  } else {
    Serial.println("setf() error") ;
  }
  vfo.enable();
  

  Serial.print("PLL INT:");
  Serial.println(vfo.N_Int);
  Serial.print("PLL FRAC:");
  Serial.println(vfo.Frac);
  Serial.print("PLL MOD:");
  Serial.println(vfo.Mod);
  Serial.print("PLL PFD:");
  Serial.println(vfo.PFDFreq);
  Serial.print("PLL output divider:");
  Serial.println(vfo.outdiv);
  Serial.print("PLL prescaler:");
  Serial.println(vfo.Prescaler);
  Serial.println("");
  delay(2000);
}

I get this error:

setf() to 40 MHz
output freq diff than requested
Mod out of range
setf() error
cfreq: 22349
PLL INT:0
PLL FRAC:-23
PLL MOD:2147483246
PLL PFD:25000000.00
PLL output divider:64
PLL prescaler:0

It is weird because I also try to use Analog software to calculate, and it calculates that INT is 102, FRAC is 2, PFD is 25 Mhz, Div is 64.

I look at the code but still don't understand why it cannot calculate the right value like the software.

I have a problem generating 404MHz out with the code below. If I modify the code below to set frequency to 80MHz with vfo.setf(80000000UL) it works fine as seen on the oscilloscope. There is a sine out at 80Mhz.

If I try to set it to 404MHz with vfo.setf(404000000UL) I don't get 404MHz out.

The reference is 25MHz.

Is there something with some dividers I have set wrong since this is a higher frequency or is there a bug in the library? I have used your example code as a basis but simplified it a bit (see below). Can you say what is wrong?

#include <Arduino.h>
#include "adf4351.h"

#define SWVERSION "1.0"

#define PIN_SS 9  ///< SPI slave select pin, default value

ADF4351  vfo(PIN_SS, SPI_MODE0, 1000000UL , MSBFIRST) ;


void setup()
{
  delay(5000);
  Serial.begin(9600) ;
  Serial.print("Hello adf4351 demo v") ;
  Serial.println(SWVERSION) ;
  Wire.begin() ;
  /*!
     setup the chip (for a 10 mhz ref freq) EDIT I did use 25 MHz as reference input, not 10 MHz
     most of these are defaults
  */
  vfo.pwrlevel = 0 ; ///< sets to -4 dBm output
  vfo.RD2refdouble = 0 ; ///< ref doubler off
  vfo.RD1Rdiv2 = 0 ;   ///< ref divider off
  vfo.ClkDiv = 150 ;
  vfo.BandSelClock = 80 ;
  vfo.RCounter = 1 ;  ///< R counter to 1 (no division)
  vfo.ChanStep = steps[2] ;  ///< set to 10 kHz steps


  if ( vfo.setrf(25000000UL) ==  0 )
    Serial.println("ref freq set to 25 Mhz -- modded") ;
    else
         Serial.println("ref freq set error") ;
     vfo.init() ;
     vfo.enable() ;
}

void loop()
{
  delay(1000);
 
  // ERROR! Doesn't generate 404MHz out.  
  // However if I edit this to 80MHz it works and the freq out is correct.
  Serial.println("setf() to 404 MHz instead of 80MHz") ;

  if ( vfo.setf(404000000UL) == 0 ) {
    Serial.print("setf() success freq:") ;
    Serial.println(vfo.cfreq) ;
  } else {
    Serial.println("setf() error") ;
  }
}
 

hi! I want to know that the relationship between the real REF input and the rf I set in the code.
thank u!!!!