PWM signal via sine-triangle comparison

The sinvalue generation is missing from the code snippets, so we can't see where it probably goes wrong. Without the code, I don't understand at first sight how 2000 (actually 2001) sine samples are using a 500 point half-sine table and how the negative halve is generated.

A possible trapdoor is the PWM compare for equality which can cause dropouts when sinvalue changes immediately at the crosspoint. Generally you'll decide for natural versus regular sampling and then implement a method that doesn't lose PWM edges.