Update hardware_utils.cpp

Author: askuric

src/common/hardware_utils.cpp

@@ -139,8 +139,8 @@ void _setPwmFrequency(long pwm_frequency,const int pinA, const int pinB, const i
   if(pinD != NOT_SET) _setHighFrequency(pwm_frequency, pinD); // stepper motor
 
 #elif defined(ESP_H) // if esp32 boards
-  if(pwm_frequency == NOT_SET) pwm_frequency = 40000; // default frequency 20khz
-  else pwm_frequency = constrain(pwm_frequency, 0, 60000); // constrain to 30kHz max
+  if(pwm_frequency == NOT_SET) pwm_frequency = 40000; // default frequency 20khz - centered pwm has twice lower frequency
+  else pwm_frequency = constrain(2*pwm_frequency, 0, 60000); // constrain to 30kHz max - centered pwm has twice lower frequency
 
   if(pinD == NOT_SET){
     bldc_motor_slots_t m_slot = {};