3 Replies Latest reply on Nov 10, 2013 3:45 AM by HeLi_263931

    More DDS [IQ Dual Phase DDS]

              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]

          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   











          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



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

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


            #define true -1


            #define false 0





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

              Even better: just

              #include <stdbool.h>

              and use true and false directly...