PCA9685ServoExample not working

[luke-ff]

I've tried to test the PCA9685 servo examples. They don't work, and I managed to figure out, where the problem might be located:

Taking a look at com.pi4j.component.servo.impl.GenericServo.setPositon():

public void setPosition(float position) {
this.position = validatePosition(position);
pwmDuration = calculatePwmDuration(position);
servoDriver.setServoPulseWidth(pwmDuration);
}

• calculatePwmDuration does not return a duration, but a value between 0 and 4096
• setServoPulseWidth calls setPwm(Pin, int duration) (where duration is microseconds)

this results in wrong signals...

[Sciss]

A work around is to use setServoPulseWidth directly, all you need to do is interpolate between minimum and maxium pulse-width in microseconds, e.g. 500 to 2500 which might correspond to 0 to 180 degrees.