Function pwmToneWrite

wiringPi/wiringPi.c:2501–2513

 */

void pwmToneWrite (int pin, int freq)
{
  setupCheck ("pwmToneWrite") ;

  if (freq == 0)
    pwmWrite (pin, 0) ;             // Off
  else
  {
    int range = 600000 / freq ;
    pwmSetRange (range) ;
    pwmWrite    (pin, freq / 2) ;
  }
}