Help modifying servo.h to give a 400hz signal

Hello Everyone
am using Due with 12-bit 330Hz Servo :slight_smile:
i was trying to get 330Hz for Servo PWM with 12-bit
https://www.unitjuggler.com/convert-frequency-from-Hz-to-µs(p).html?val=330
i set #define REFRESH_INTERVAL 3030
in Servo.h
is that okay or !
Best,,