Class Pcx8574

Represent an Pcx8574 8 bit I2C port expander

Assembly: Pcx857x.dll

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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, Meadow.Foundation.ICs.IOExpanders.Pcf8574

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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public Pcx8574.PinDefinitions Pins { get; }

NumberOfPins

The number of IO pins available on the device

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public override int NumberOfPins { get; }

Methods

IsValidPin(IPin)

Is the pin valid for this device instance

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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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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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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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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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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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protected override ushort ReadState()

Returns

System.UInt16

WriteState(ushort)

Writes the peripheral state register

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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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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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protected byte ReadState8()

Returns

System.Byte

WriteState(byte)

Writes the peripheral state register for 8 pin devices

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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