configureClock go above 10 microSeonds sample rate?

[bodtx]

according to the doc you cannot go below 1 microseconds

as I can see on my oscilloscope I cannot go below approximatly 1/(0.2×10⁻3) = 5000 5Khz with pigpio.configureClock(1, pigpio.CLOCK_PCM).

how could I go to 20kHz (to control motors, which is a good frequency)?

I have already one motor on the hardware pwm pin.

[fivdi]

What frequency does the oscilloscope see on GPIO17 if the below program is run. It should see approximately 20kHz.

const pigpio = require('pigpio');
const Gpio = pigpio.Gpio;

pigpio.configureClock(1, pigpio.CLOCK_PCM);

const led = new Gpio(17, {mode: Gpio.OUTPUT});

led.pwmFrequency(20000);
led.pwmRange(50);
led.pwmWrite(25);

setTimeout(_ => {}, 1e6);

[fivdi]

To the best of my knowledge the information needed has been provided here so I'll go ahead and close the issue,

[bodtx]

Sorry for responding late, after testing to the oscilloscope, it works! 🏅

When monitoring the cpu it was at 25% approximately as the doc says. I've tried to lower the configureClock to 5 or so but it was impossible to reach the 20KHz.

maybe you should add a word in the doc about pwmFrequency pwmRange ?

[fivdi]

Sorry for responding late, after testing to the oscilloscope, it works! 🏅

No problem.

maybe you should add a word in the doc about pwmFrequency pwmRange ?

The documentation for pwmFrequency is here. As can be seen in the table, a frequency of 20kHz is possible when the sampling rate is 1us or 2us. The table also shows that the maximum frequency at a sampling rate of 5us is 8kHz.

The documentation for pwmRange is here.

What can be added to the documentation to improve things?