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I am using NodeMCU and I program it using Arduino IDE, I need to change the PWM frequency of a port, in Arduino I used to change the frequency using timers registers like that:

TCCR1B = (TCCR1B & 0xF8) | 1 ;

How can I change the frequency of a digital pin using some function like that:

analogWriteFrequency(pin, 31250);

So that the code will looks like that:

#ifdef __AVR__
TCCR1B = (TCCR1B & 0xF8) | 1 ; //generates the MCKL signal
#else
analogWriteFrequency(pin, 31250);
#endif
analogWrite(pin, 128) ;

Thanks.

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PWM frequency is 1kHz by default. Call analogWriteFreq(new_frequency) to change the frequency.

source

  • Thanks. but, can I adjust it to a specific pin ? – Mostafa Khattab Jul 10 '16 at 12:30
  • Probably not. They probably all use the same single PWM generator. – Ignacio Vazquez-Abrams Jul 10 '16 at 12:33

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