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Class Pwm

PWM is the Pulse Width Modulation interface to libmraa. It allows the generation of a signal on a pin. Some boards may have higher or lower levels of resolution so make sure you check the board & pin you are using before hand.

Inheritance
System.Object
Pwm
Namespace:MraaSharp
Assembly:MraaSharp.dll
Syntax
public class Pwm : IDisposable

Constructors

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Pwm(Int32)

Initialise pwm_context, uses board mapping

Declaration
public Pwm(int pin)
Parameters
Type Name Description
System.Int32 pin

The PWM PIN
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Pwm(Int32, Int32)

Initialise pwm_context, raw mode

Declaration
public Pwm(int chipid, int pin)
Parameters
Type Name Description
System.Int32 chipid

The chip inwhich the PWM is under in SYSFS

System.Int32 pin

The PWM PIN

Properties

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Enable

Set the enable status of the PWM pin. None zero will assume on with output being driven. and 0 will disable the output

Declaration
public bool Enable
{
    set;
}
Property Value
Type Description
System.Boolean
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MaxPeriod

Get the maximum pwm period in us

Declaration
public int MaxPeriod
{
    get;
}
Property Value
Type Description
System.Int32
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MinPeriod

Get the minimum pwm period in us

Declaration
public int MinPeriod
{
    get;
}
Property Value
Type Description
System.Int32
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Owner

Change ownership of context

Declaration
public bool Owner
{
    set;
}
Property Value
Type Description
System.Boolean

Methods

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ConfigMilliseconds(Int32, Single)

Set Both Period and DutyCycle on a PWM context

Declaration
public void ConfigMilliseconds(int period, float duty)
Parameters
Type Name Description
System.Int32 period

represented in ms.

System.Single duty

dutycycle of the pwm signal.

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ConfigPercent(Int32, Single)

Set Both Period and DutyCycle on a PWM context. Duty represented as percentage.

Declaration
public void ConfigPercent(int period, float duty)
Parameters
Type Name Description
System.Int32 period

represented in ms.
System.Single duty

duty percantage. i.e. 50% = 0.5f

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Dispose()

Declaration
public void Dispose()
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SetPeriod(Single)

Set the PWM period as seconds represented in a float

Declaration
public void SetPeriod(float seconds)
Parameters
Type Name Description
System.Single seconds

Period represented as a float in seconds

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SetPeriodMicroseconds(Int32)

Set period, microseconds.

Declaration
public void SetPeriodMicroseconds(int us)
Parameters
Type Name Description
System.Int32 us

Microseconds as period

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SetPeriodMilliseconds(Int32)

Set period, milliseconds.

Declaration
public void SetPeriodMilliseconds(int ms)
Parameters
Type Name Description
System.Int32 ms

Milliseconds for period
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SetPulseWidthMicroseconds(Int32)

Set pulsewidth, microseconds

Declaration
public void SetPulseWidthMicroseconds(int us)
Parameters
Type Name Description
System.Int32 us

Microseconds for pulsewidth
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SetPulseWidthMicroseconds(Single)

Set pulsewidth, As represnted by seconds in a (float)

Declaration
public void SetPulseWidthMicroseconds(float seconds)
Parameters
Type Name Description
System.Single seconds

The duration of a pulse

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SetPulseWidthMilliseconds(Int32)

Set pulsewidth, milliseconds

Declaration
public void SetPulseWidthMilliseconds(int ms)
Parameters
Type Name Description
System.Int32 ms

Milliseconds for pulsewidth
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Write(Single)

Set the ouput duty-cycle percentage, as a float

Declaration
public void Write(float percentage)
Parameters
Type Name Description
System.Single percentage

A floating-point value representing percentage of output. The value should lie between 0.0f (representing on 0%) and 1.0f Values above or below this range will be set at either 0.0f or 1.0f