softPwm --> ledcWrite

[pllagunos]

Hi.

In my application I am using a ESP32 driving a thrystor using 8 bit PWM. According to the manufacturer the minimum PWM frequency should be 1kHz. Using softPwm, this would mean the windowSize should be < 1 (since millis is used). Since in the .cpp, time variables are uint32_t, the maximum frequency using softPwm would be 1kHz, right?

Then what I don't understand is what would happen with the following MAX31856 example:
`void loop() {
float optimumOutput = tuner.softPwm(relayPin, Input, Output, Setpoint, outputSpan, debounce);

switch (tuner.Run()) {
case tuner.sample: // active once per sample during test
if (!digitalRead(drdyPin)) Input = maxthermo.readThermocoupleTemperature();
tuner.plotter(Input, Output, Setpoint, 0.5f, 3); // output scale 0.5, plot every 3rd sample
break;

case tuner.tunings: // active just once when sTune is done
  tuner.GetAutoTunings(&Kp, &Ki, &Kd); // sketch variables updated by sTune
  myPID.SetOutputLimits(0, outputSpan * 0.1);
  myPID.SetSampleTime(outputSpan - 1);

...`

because when I set outputSpan = 1 (to get the necesarry 1kHz frequency of the PWM) then the PID output will be limited to a max of 0.1.

Would using a function like ledcWrite, which allows frequency to be specified, help solve this issue?