timing error

[longwu2000]

Hey

So i change the theta generation, speed encoder, and pwm blocks into while loop and the code can be successfully compiled. However, I still have one question, I change a bit of the FXP triangle(SCTL) vi to work in while loop. The new vi I got is attached, this vi if works in SCTL it can generate 10k Hz triangle waveform (which is the frequency I desired ). However if I put the same block in while loop, it can give me some right waveform up to 5Khz and if I want 10kHz it gives some frequency between 8.5 and 12.5Khz . No matter how I choose the while loop ticks number it wont work

Please tell me where I did wrong

Thank you

[AL3]

In a PWM modulator, the carrier generator, which is often based on a counter, must be executed inside a SCTL.

In this case, each execution results in a constant time step equals to a single clock pulse.

When it is executed outside a SCTL, you cannot control the time-step resulti, often, in a different switching/sampling frequency.

Moreover, you can use integer data type instead of FXP.

If you need higher PWM resolution, you can link the SCTL to a higher derived clock. I run my PWM modulator and its scheduler @ 120MHz.