// STM32F103 (Blue Pill) PWM example
// Equivalent of PIC CCP1 PWM on RC2

#define PWM_PIN PA8   // Hardware PWM pin

void setup() {
  pinMode(PWM_PIN, OUTPUT);
}

void loop() {

  analogWrite(PWM_PIN, 0);     // 0% duty
  delay(1000);

  analogWrite(PWM_PIN, 64);    // 25% duty (64/255)
  delay(1000);

  analogWrite(PWM_PIN, 128);   // 50% duty
  delay(1000);

  analogWrite(PWM_PIN, 191);   // 75% duty
  delay(1000);

  analogWrite(PWM_PIN, 255);   // 100% duty
  delay(1000);
}