1 Reply Latest reply on Mar 15, 2011 5:42 AM by nguyen.van.nghia

    Sine wave lookup to PWM8 output with no latency?

    user_82417623

      Hello all -

         

      I am a newbie, using a PSoC 1, and I need to generate a PWM output that is a sine wave (after filtering). The sine wave values will be from a lookup table (similar to the example program using a sine wave lookup to drive a DAC).

         

      My question has to do with updating the PWM with each new lookup value. I cannot stop the PWM, or delay it, while loading the next sine wave value. If that happens, then the frequency of the sine wave output will be off.

         

      So what I need to do is to load the next PWM pulse width value (the period is always 255) without adding any extra delay to the PWM output.

         

      I have also been wondering if something like a counter or a one-shot would also work for this, and if one of those may make the solution easier?

         

      Thanks in advance for your help!

         

      Dan