8 Replies Latest reply on Nov 10, 2016 9:40 PM by anks

    ADC DMA FIlter




      I am using 16 bit ADC and Transferring my data to Filter using DMA and Getting the result of filter in 16 bit. My concern is when I run the code it is not going into the loop. The code is exiting at while (Filter_IsInterruptChannelA() == 0) ; I attached the code please help me regarding this. My aim is to transfer 16bit output of ADC to Filter using DMA and get the 16 bit filter output.


      Thank you


      Hem k

        • 1. Re: ADC DMA FIlter

          Can you please post your complete project, so that we all can have a look at all of your settings. To do so, use
          Creator->File->Create Workspace Bundle (minimal)
          and attach the resulting file.





          • 2. Re: ADC DMA FIlter

            Thank you Bob. I attached the complete project


            Hem k

            • 3. Re: ADC DMA FIlter

              There is no bug, but your indentation is wrong:


                      while (Filter_IsInterruptChannelA() == 0) ; // This is a loop waiting for something getting. see the ";" at end
                          Output=(Filter_Read16(Filter_CHANNEL_A)); // This will be executed after and is indented badly




              I frequently use


              #define Wait(x)


              ,,,and then this would look like


                      while (!Filter_IsInterruptChannelA() )  Wait();







              • 4. Re: ADC DMA FIlter

                Hi Bob, this is totally oblique to this actual thread (apologies to Hem for the distraction ... I too often wonder about the mysteries of DMA), but: Is there any way to get in contact with you outside of the forums? There is no private message option on this forum :\
                Don't post any contact info openly of course, it will get scraped for spam! But other than that, I don't know how to accomplish contact. Are you with Cypress, or on any other forum or social media that I could approach you through?

                • 5. Re: ADC DMA FIlter

                  When you get hands on one of my project examples you'll find an email address in main.c. I usually do not give advices that could be placed into one of the forums. So I am waiting for you getting in contact with me.





                  • 6. Re: ADC DMA FIlter

                    Hii Bob Actually I tried doing the way you mentioned. But still the same problem exists.




                    Hem K

                    • 7. Re: ADC DMA FIlter

                      Hem, I tried to tell you that there is no problem. Your program runs as required.


                      If you are expecting something else, be a bit (or byte ;-) more specific.





                      • 8. Re: ADC DMA FIlter

                        You can try this also-


                        if (Filter_IsInterruptChannelA() != 0) 
                        CyDelay(3000);//fill value in CyDelay which is the upper value for which you wish to wait


                        The other may be that  Channel A has not triggered a data-ready interrupt.,thus it is not going the the loop and stuck into statement "while (Filter_IsInterruptChannelA() == 0) ; "