Class Pcx8574

Represent an Pcx8574 8 bit I2C port expander

Assembly: Pcx857x.dll

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Declaration

public abstract class Pcx8574 : Pcx857x, IDigitalOutputController, IDigitalInputController, IDigitalInterruptController, IPinController, II2cPeripheral, IDisposable

Inheritance: System.Object -> Meadow.Foundation.ICs.IOExpanders.Pcx857x

Derived:
Meadow.Foundation.ICs.IOExpanders.Pca8574

Implements:
Meadow.Hardware.IDigitalOutputController, Meadow.Hardware.IDigitalInputController, Meadow.Hardware.IDigitalInterruptController, Meadow.Hardware.IPinController, Meadow.Hardware.II2cPeripheral, System.IDisposable

Properties

Pins

Pcx8574 pin definitions

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Declaration

public Pcx8574.PinDefinitions Pins { get; }

NumberOfPins

The number of IO pins available on the device

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Declaration

public override int NumberOfPins { get; }

Methods

IsValidPin(IPin)

Is the pin valid for this device instance

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Declaration

protected override bool IsValidPin(IPin pin)

Returns

System.Boolean: True if pin is valid

Parameters

Type	Name	Description
Meadow.Hardware.IPin	pin	The IPin to validate

GetPin(string)

Get pin reference by name

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Declaration

public override IPin GetPin(string pinName)

Returns

Meadow.Hardware.IPin: IPin reference if found

Parameters

Type	Name	Description
System.String	pinName	The pin name as a string

SetPinDirection(bool, byte)

Set the pin direction

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Declaration

protected override void SetPinDirection(bool input, byte pinKey)

Parameters

Type	Name	Description
System.Boolean	input	true for input, false for output
System.Byte	pinKey	The pin key value

GetPinState(IPin)

Retrieves the state of a pin

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Declaration

protected override bool GetPinState(IPin pin)

Returns

System.Boolean

Parameters

Type	Name	Description
Meadow.Hardware.IPin	pin	The pin to query

SetPinState(IPin, bool)

Sets the state of a pin

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Declaration

protected override void SetPinState(IPin pin, bool state)

Parameters

Type	Name	Description
Meadow.Hardware.IPin	pin	The pin to affect
System.Boolean	state	<b>True</b> to set the pin state high, <b>False</b> to set it low

ReadState()

Reads the peripheral state register

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Declaration

protected override ushort ReadState()

Returns

System.UInt16

WriteState(ushort)

Writes the peripheral state register

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Declaration

protected override void WriteState(ushort state)

Parameters

Type	Name
System.UInt16	state

SetState(ushort)

Writes the peripheral state register and updates driver internal state

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Declaration

protected override void SetState(ushort state)

Parameters

Type	Name
System.UInt16	state

ReadState8()

Reads the peripheral state register for 8 pin devices

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Declaration

protected byte ReadState8()

Returns

System.Byte

WriteState(byte)

Writes the peripheral state register for 8 pin devices

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Declaration

protected void WriteState(byte state)

Parameters

Type	Name
System.Byte	state

Implements

• Meadow.Hardware.IDigitalOutputController
• Meadow.Hardware.IDigitalInputController
• Meadow.Hardware.IDigitalInterruptController
• Meadow.Hardware.IPinController
• Meadow.Hardware.II2cPeripheral
• System.IDisposable