Nov 23, 2024. BFO Code for the TR-3 with a 9MHz Filter

 

   /* This is the  use of the Xiao RP2040 and the Si5351 for a BFO for the TR3
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         */








        #include "xiaoRP2040pinNums.h" // Or use the device pin numbers with "u" suffix.
        #include <Wire.h>
       
        #include "si5351.h"
        
        #define i2cSDA D4
        #define i2cSCL D5

      
      
        
       
        
        
      
        
        
        // Values in whole integer Hz
        
        uint32_t bfo = 8998500;    // Declared as a 32-bit unsigned integer
        

       

        
        Si5351 si5351;
       
        
        ////========================================
        ////******** FUNCTION: setup ***************
        ////========================================
        void setup() {

          Serial.begin(57600);

          
          
          Wire.begin();
              
          // Initialize the Si5351
          si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0, 0);             
          
          // Set Si5351 Clocks
          
          si5351.set_freq(bfo* 100, SI5351_CLK2);   // in integer hundredths of Hz (whole Hz times 100)

          si5351.set_correction(1000,SI5351_PLL_INPUT_XO);
          
          
          si5351.drive_strength(SI5351_CLK2,SI5351_DRIVE_8MA);


          
          pinMode(2u, INPUT_PULLUP);   // usb/Lsb select          
          


        }



        

        
        




         
       // End of setup()
        
        //========================================
        //********* FUNCTION: (main)loop *********
        //========================================
        void loop() {   // Empty

            
        
       
          checkSideband();

          
       
         }

                 
                
                  


                 
                 
               
                


                 



                  
      
      

  //********************* Check Sideband********************

          
                  void checkSideband(){
      
                if(digitalRead(2u)){  //********If SW is true do the following.    
           
           
                 bfo = 8998500L;

                if (bfo = 8998500L);
                si5351.set_freq( bfo*100, SI5351_CLK2);
           
           
          
                
          
                }
                  else{                //**********if not, do this.
          
          
          
         
                 bfo =  9001500L;
                 si5351.set_freq( bfo*100, SI5351_CLK2);
             
             
             
                 }

    
         }