I have some questions here too... making you work for the answers will help you better to understand and resolve the problem...

>Can I use HPWM command in pbp?

Can you tell me if HPWM is a PBP command? Your answer to that will answer your own question. Clue: Look in the PBP Manual.

>I think that this command isn’t useful for me because it needs the frequency.

So how do you think PWM works without a frequency?