3 Replies Latest reply on Nov 10, 2013 3:45 AM by user_78878863

    More DDS [IQ Dual Phase DDS]

    junichi.hiraoka
              Hi Pals   
      I'm so glad to used the DDS modules by many friends,   
      They told me that there are many applications of DDS.   
         
      There is no necessarily of sine wave is in always,   
      Some application needs more high frequency   
      and that is enough as pulse wave.   
         
      Hence this time   
      I was made a IQ-DDS module   
      It is upto 5MHz and Minimum frequency resolution is 2.86Hz at 48MHz clock.   
         
      This test bench is implemented to Pioneer-Kit, Bootable PSoC5LP   
      How to is describe in this article, 9.OCT.2013   
      [ http://www.cypress.com/?app=forum&id=2492&rID=86654 ]   
         
      Would you mind to make a SDR Radio.   
      Have a nice days.   
        • 1. Re: More DDS [IQ Dual Phase DDS]
          user_1377889

          I cannot resist to comment something on your programming-style:

             

          You #define in your file Globals.h the constants "true" and "false" as

             

           

             

          //////////////////////////////////////////////////////////////////////////////////

                  true -1   

           

             

          #define

             

           

             

          #define

                 

           

             

          false 0

             

          //////////////////////////////////////////////////////////////////////////////////

                 

          Did you ever try what your program does when you write

             

          if((5 == 5) == true)

             

          or comparing two variables with the same value as

             

          if((VarA == VarB) == true

             

          or even checking a boolean variable as I frequently see in code

             

          if(BoolVar == true)

             

          Astonishingly the comparision will go wrong and finding the cause for this can cost you some time! The excuse "I do not compare in my code something to true" will help you, but it does not hinder you (or someone else) to do so. I have learnt to do it a little bit different: We all know that a false condition is defined as the value zero, so when using the logic of C we are independent of what value "true" (which in GCC is 1, not -1) is used.

             

          #define false 0 // as we know

             

          #define true !false // whatever the compiler chooses

             

           

             

          Happy coding

             

          Bob

          • 2. Re: More DDS [IQ Dual Phase DDS]
            user_1377889

            Sorry, the forum software klobbered your pasted code from your file, it originally red

               

            #define true -1

               

            #define false 0

               

             

               

            Bob

            • 3. Re: More DDS [IQ Dual Phase DDS]
              user_78878863

              Even better: just

                 
              #include <stdbool.h>
                 

              and use true and false directly...