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PwmOutput.cs
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PwmOutput.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Device.Gpio;
using Iot.Device.GrovePiDevice.Models;
namespace Iot.Device.GrovePiDevice.Sensors
{
/// <summary>
/// PwmOutput class to support hardware PWM on PWM hardware enabled pins
/// </summary>
public class PwmOutput
{
/// <summary>
/// Only Digital PWM are supported
/// </summary>
public static List<GrovePort> SupportedPorts => new List<GrovePort>()
{
GrovePort.DigitalPin3,
GrovePort.DigitalPin5,
GrovePort.DigitalPin6
};
internal GrovePi _grovePi;
internal byte _duty;
/// <summary>
/// grove sensor port
/// </summary>
internal GrovePort _port;
/// <summary>
/// PwmOutput constructor
/// </summary>
/// <param name="grovePi">The GrovePi class</param>
/// <param name="port">The grove Port, need to be in the list of SupportedPorts</param>
public PwmOutput(GrovePi grovePi, GrovePort port)
{
if (!SupportedPorts.Contains(port))
{
throw new ArgumentException(nameof(port), "Grove port not supported.");
}
_grovePi = grovePi;
_port = port;
_grovePi.PinMode(_port, PinMode.Output);
Value = 0;
}
/// <summary>
/// For GrovePi, Value is same as Duty
/// </summary>
public byte Value
{
get
{
return Duty;
}
set
{
Duty = value;
}
}
/// <summary>
/// Get/set the PWM duty to use to generate the sound from 0 to 100
/// </summary>
public byte Duty
{
get
{
return _duty;
}
set
{
var prev = _duty;
_duty = MathExtensions.Clamp(value, (byte)0, (byte)100);
if (prev != _duty)
{
Start();
}
}
}
/// <summary>
/// Starts the PWM duty
/// </summary>
public void Start()
{
_grovePi.AnalogWrite(_port, _duty);
}
/// <summary>
/// Stop the PWM duty
/// </summary>
public void Stop()
{
_grovePi.AnalogWrite(_port, 0);
}
/// <summary>
/// Returns the duty in a formated string
/// </summary>
/// <returns>Returns the duty in a formated string</returns>
public override string ToString() => $"Duty: {Value}";
/// <summary>
/// Get the duty cycle as a persentage
/// </summary>
public byte ValueAsPercent => (byte)(Value / byte.MaxValue);
/// <summary>
/// Get the name PWM Output
/// </summary>
public string SensorName => "PWM Output";
}
}