pwmLookup method
PWM lookup - mraa_pwm_lookup
Get the PWM index by name, the board must be initialised. Returns the MRAA index for PWM name or Mraa.generalError on error.
Implementation
int pwmLookup(String pwmName) =>
_impl.mraa_pwm_lookup(pwmName.toNativeUtf8().cast<Char>());