6 Replies Latest reply on Jun 3, 2015 4:56 PM by ToVa_285016

    Program crashing into CY_NORETURN

    ToVa_285016

       Hi,

         

      I have a program that is crashing and ending up in the while loop in CY_NORETURN CY_ISR(IntDefaultHandler).

         

      I thought this was a pretty straight forward program, but it ends up crashing, whether it takes a minute, or 24 hours, it happens. 

         

      Please look through the code and let me know if there are any obvious, or subtle problems that might be causing this.

         

      I have a version of the program that just uses a CyDelay instead of the timer, and seems to work fine, but I cannot see what i am doing incorrectly with the timer.

         

      Thank you,
      Tom

        • 1. Re: Program crashing into CY_NORETURN
          JoMe_264151

          You posted your project that uses CyDelay().

             

          Can you present us with the timer version?

             

           And:

             

          When you halt the program when in the infinite loop, don't you get a clue where it stopped from the call-stack??

             

           

             

          Bob

          • 2. Re: Program crashing into CY_NORETURN
            ToVa_285016

             Hi,

               

            It is the correct program, there is a timer interrupt.  The CyDelay is just for the CapSense.  

               

            The call stack is showing the program crashing in the ProgramControl_IsBusy() - Capsense is busy check. 

               

            There is another wrinkle to this story.  It looks like the program is crashing when the circuit board with the CapSense is close to an AC power supply that is being switched through relays.  Does this make any sense?

               

            If so, why can I not get the program with no timer interrupt (attached) to suffer the same fate?

               

            Thank you,
            Tom

            • 3. Re: Program crashing into CY_NORETURN
              JoMe_264151

              I cannot see the timer nor the interrupt. Where did you hide it?

                 

               

                 

              Bob

              • 4. Re: Program crashing into CY_NORETURN
                ToVa_285016

                 Sequencer1.zip has the timer, Sequencer._3.1 is the version that does not.

                   

                Sorry for the confusion.

                   

                Thank you,
                Tom

                • 5. Re: Program crashing into CY_NORETURN
                  DaKn_263916

                  There is another wrinkle to this story.  It looks like the program is crashing when the circuit board with the CapSense is close to an AC power supply that is being switched through relays.  Does this make any sense?

                     

                   

                     

                  Any Hi Z node, pin, is very susceptable to pickup, and transients that take

                     

                  pin outside supply rails in voltage. That in turn can inject charge into substrate

                     

                  of chip, and what logic it winds up being removed by is anybodys guess.

                     

                   

                     

                  Use a DSO, set up to trigger .5 V below Vss and .5 V above Vdd and see if you

                     

                  can get triggers on any pins. That includes power pins. Thats the first clue you

                     

                  have some real problems. Solutions can be diode/zener arrays attached to pins,

                     

                  Fairchild, On Semi make them.

                     

                   

                     

                  Shielding, RC filters on pins, many approaches. Use Polymer Tants for bulk

                     

                  bypass, they have an order of magnitude better Z vs F curves.

                     

                   

                     

                  www.dropbox.com/s/ruaf9booe17jk8n/PCB%20Layout.zip

                     

                  www.dropbox.com/s/2h96beh1fbvz4e2/noise_notes.zip

                     

                   

                     

                  Regards, Dana.

                  • 6. Re: Program crashing into CY_NORETURN
                    ToVa_285016

                     Thank you for the CapSense tips, I will certainly employ them.

                       

                    In this case, however, it looks like the timer is indeed the culprit.  The CapSense works fine and never crashes when I use the project without the timer.

                       

                    Any ideas how the two might affect each other?

                       

                    Thank you,
                    Tom