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PWM.cs
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PWM.cs
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using System;
namespace OrangePiGpio
{
public class PWM
{
private readonly PwmController _controller;
public int Chip { get; }
public int Pin { get; }
public double Frequency { get; private set; }
public double DutyCyclePercent { get; private set; }
public bool InvertPolarity { get; private set; }
public PWM(int chip, int pin, double frequency, double dutyCyclePercent, bool invertPolarity = false)
{
_controller = new PwmController();
Chip = chip;
Pin = pin;
Frequency = frequency;
DutyCyclePercent = dutyCyclePercent;
InvertPolarity = invertPolarity;
_controller.PWM_Export(Chip, Pin);
_controller.PWM_Polarity(Chip, Pin, InvertPolarity);
_controller.PWM_Enable(Chip, Pin);
_controller.PWM_Frequency(Chip, Pin, Frequency);
}
public void StartPWM() => _controller.PWM_DutyCyclePercent(Chip, Pin, DutyCyclePercent);
public void StopPWM() => _controller.PWM_DutyCyclePercent(Chip, Pin, 0);
public void ChangeFrequency(double newFrequency)
{
double oldFrequency = Frequency;
Frequency = newFrequency;
if (newFrequency > oldFrequency)
{
_controller.PWM_Frequency(Chip, Pin, Frequency);
_controller.PWM_DutyCyclePercent(Chip, Pin, DutyCyclePercent);
}
else
{
_controller.PWM_DutyCyclePercent(Chip, Pin, DutyCyclePercent);
_controller.PWM_Frequency(Chip, Pin, Frequency);
}
}
public void SetDutyCycle(double dutyCyclePercent)
{
if (dutyCyclePercent < 0 || dutyCyclePercent > 100)
throw new ArgumentException("Duty cycle must be between 0 and 100.");
DutyCyclePercent = dutyCyclePercent;
_controller.PWM_DutyCyclePercent(Chip, Pin, DutyCyclePercent);
}
public void TogglePolarity()
{
_controller.PWM_Disable(Chip, Pin);
InvertPolarity = !InvertPolarity;
_controller.PWM_Polarity(Chip, Pin, InvertPolarity);
_controller.PWM_Enable(Chip, Pin);
}
public void Close() => _controller.PWM_Unexport(Chip, Pin);
}
}