/// <summary>
/// http://en.wikipedia.org/wiki/Pulse-width_modulation
/// </summary>
/// <param name="gpio"></param>
/// <param name="frequency"></param>
/// <param name="duration"></param>
public static void PWM(this GpioApi gpio, int on, int off, int duration)
{
gpio.DigitalWrite(PinState.Low);
var sw = Stopwatch.StartNew();
while (sw.ElapsedMilliseconds < duration)
{
gpio.DigitalWrite(PinState.High);
//Gpio.SleepMicro(on*1000);
System.Threading.Thread.Sleep(on);
gpio.DigitalWrite(PinState.Low);
//Gpio.SleepMicro(off*1000);
System.Threading.Thread.Sleep(off);
}
sw.Stop();
}
public static void ToneEx(this GpioApi gpio, int frequency, int duration)
{
gpio.DigitalWrite(PinState.Low);
var waitTimeMicroS = (1000.0 * 1000.0 / frequency);
var sw = Stopwatch.StartNew();
using (var tp = new TimePeriod((int)waitTimeMicroS))
{
while (sw.ElapsedMilliseconds < duration)
{
gpio.DigitalWrite(PinState.High);
TimePeriod.Sleep((int)(waitTimeMicroS / 1000.0));
gpio.DigitalWrite(PinState.Low);
TimePeriod.Sleep((int)(waitTimeMicroS / 1000.0));
}
}
sw.Stop();
}
public static void Tone2(this GpioApi gpio, int rate, int duration)
{
uint i = 0;
//gpio.DigitalWrite(false);
var sw = Stopwatch.StartNew();
while (sw.ElapsedMilliseconds < duration)
{
var wait = rate * 1000 * Math.Sin(i);
//var wait = rate*1000*Math.Cos(i);
//var wait = Math.Abs(rate * 1000 * Math.Cos(i) * Math.Sin(i));
//var wait = Math.Abs(rate*1000*Math.Tan(i));
//Console.Write("{0} ", (int) wait);
gpio.DigitalWrite(PinState.High);
WasteTime((int)wait);
gpio.DigitalWrite(PinState.Low);
WasteTime((int)wait);
i++;
}
sw.Stop();
}
