analogWriteSetup doesn't work inside setup

[Faustino Aguilar]

Hi @me-no-dev thank you for this project!

I have an issue with analogWriteSetup:

#define PIN 18

void setup() {
  analogWriteSetup(250, 1024); // 250Hz and 1024 steps
}

void loop() {
  analogWrite(PIN, 260); // testing 260 steps
}

PIN 18 should output around 450mV but it outputs only 20mV

[Faustino Aguilar]

After checking your source code, I realize analogWriteInit() overwrites my setup, see:

RasPiArduino/cores/piduino/wiring_pwm.c

Lines 54 to 55 in ae0f60c

 _pwm_has_started = 1; 
 _pwm_wanted_freq = analogWriteSetup(1000, 256); 

so I did this:

#define PIN 18

void setup() {
  analogWrite(PIN, 1); // executes analogWriteInit early 
  analogWriteSetup(250, 1024); // 250Hz and 1024 steps
}

void loop() {
  analogWrite(PIN, 260); // testing 260 steps
}

This way I can get the right analog setup and the expected output.