Class Mcp3xxx
Provide an interface to connect to a MCP3xxx analog to digital converter (ADC)
Assembly: Mcp3xxx.dll
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public abstract class Mcp3xxx : IAnalogInputController, IPinController, ISpiPeripheral, IDisposable
Derived:
Meadow.Foundation.ICs.IOExpanders.Mcp3001
Implements:
Meadow.Hardware.IAnalogInputController, Meadow.Hardware.IPinController, Meadow.Hardware.ISpiPeripheral, System.IDisposable
Properties
IsDisposed
Is the object disposed
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public bool IsDisposed { get; }
SpiComms
Gets the underlying ISpiCommunications instance
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protected ISpiCommunications SpiComms { get; }
ChannelCount
the number of input channels on the ADC
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protected int ChannelCount { get; set; }
DefaultSpiBusSpeed
The default SPI bus speed for the device
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public Frequency DefaultSpiBusSpeed { get; }
DefaultReferenceVoltage
The default reference voltage for the device
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public Voltage DefaultReferenceVoltage { get; }
SpiBusSpeed
The SPI bus speed for the device
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public Frequency SpiBusSpeed { get; set; }
DefaultSpiBusMode
The default SPI bus mode for the device
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public SpiClockConfiguration.Mode DefaultSpiBusMode { get; }
SpiBusMode
The SPI bus mode for the device
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public SpiClockConfiguration.Mode SpiBusMode { get; set; }
AdcResolutionInBits
The resolution of the analog-to-digital converter in the Mcp3xxx This is model-specific and not configurable
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public int AdcResolutionInBits { get; protected set; }
Methods
CreateAnalogInputPort(IPin, int)
Create an analog input port for a pin
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protected IAnalogInputPort CreateAnalogInputPort(IPin pin, int sampleCount = 64)
Returns
Meadow.Hardware.IAnalogInputPort: An instance of Meadow.Hardware.IAnalogInputPort that represents the analog input on the specified pin
Parameters
| Type | Name | Description |
|---|---|---|
Meadow.Hardware.IPin | pin | The pin to use for the analog input port |
System.Int32 | sampleCount | The number of samples to take when measuring the pin's voltage |
CreateAnalogInputPort(IPin, int, TimeSpan, Voltage)
Creates a new instance of an IAnalogInputPort for the specified pin
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public IAnalogInputPort CreateAnalogInputPort(IPin pin, int sampleCount, TimeSpan sampleInterval, Voltage voltageReference)
Returns
Meadow.Hardware.IAnalogInputPort: A new instance of an IAnalogInputPort
Parameters
| Type | Name | Description |
|---|---|---|
Meadow.Hardware.IPin | pin | The IPin object that this port is created from |
System.Int32 | sampleCount | The number of samples to take |
System.TimeSpan | sampleInterval | The interval delay between samples |
Meadow.Units.Voltage | voltageReference | The Voltage reference for ADC readings |
CreateAnalogInputPort(IPin, int, TimeSpan, Voltage, InputType)
Creates a new instance of an IAnalogInputPort for the specified pin
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public IAnalogInputPort CreateAnalogInputPort(IPin pin, int sampleCount, TimeSpan sampleInterval, Voltage voltageReference, Mcp3xxx.InputType inputType)
Returns
Meadow.Hardware.IAnalogInputPort: A new instance of an IAnalogInputPort
Parameters
| Type | Name | Description |
|---|---|---|
Meadow.Hardware.IPin | pin | The IPin object that this port is created from |
System.Int32 | sampleCount | The number of samples to take |
System.TimeSpan | sampleInterval | The interval delay between samples |
Meadow.Units.Voltage | voltageReference | The Voltage reference for ADC readings |
| Meadow.Foundation.ICs.IOExpanders.Mcp3xxx.InputType | inputType | The pin channel input type |
CreateAnalogInputArray(params IPin[])
Creates an IAnalogInputArray instance from the specified set of pins
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public IAnalogInputArray CreateAnalogInputArray(params IPin[] pins)
Returns
Meadow.Hardware.IAnalogInputArray
Parameters
| Type | Name | Description |
|---|---|---|
Meadow.Hardware.IPin[] | pins | The pins to use for the IAnalogInputArray |
IsInputTypeSupported(InputType)
Is the input type supported on this MCP3xxx version
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public virtual bool IsInputTypeSupported(Mcp3xxx.InputType inputType)
Returns
System.Boolean: True if supported, false if not supported
Parameters
| Type | Name | Description |
|---|---|---|
| Meadow.Foundation.ICs.IOExpanders.Mcp3xxx.InputType | inputType | The input type |
ValidateChannel(int, int)
Checks if channel is in range
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protected void ValidateChannel(int channel, int channelCount)
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | channel | The channel |
System.Int32 | channelCount | The number of channels on the device |
ValidateChannelPairing(int, int)
Checks if the channel is in range of the available input channels and that both channels are part of a valid pairing
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protected void ValidateChannelPairing(int valueChannel, int referenceChannel)
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | valueChannel | The 1st (value) channel in the pairing |
System.Int32 | referenceChannel | The 2nd (reference) channel in the pairing |
ReadSingleEnded(int)
Reads a value from the device for a single ended input
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protected virtual int ReadSingleEnded(int channel)
Returns
System.Int32: The raw voltage
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | channel | Channel which represents the input signal |
ReadPseudoDifferential(int, int)
Reads a value from the device using pseudo-differential inputs
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protected virtual int ReadPseudoDifferential(int valueChannel, int referenceChannel)
Returns
System.Int32: The raw relative voltage
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | valueChannel | Channel which represents the signal |
System.Int32 | referenceChannel | Channel which represents ground |
ReadDifferential(int, int)
Reads a value from the device using differential inputs
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protected virtual int ReadDifferential(int valueChannel, int referenceChannel)
Returns
System.Int32: The raw relative voltage
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | valueChannel | Channel which represents the positive signal |
System.Int32 | referenceChannel | Channel which represents the negative signal |
ReadInternal(int, InputType, int)
Reads a value from the device
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protected virtual int ReadInternal(int channel, Mcp3xxx.InputType inputType, int adcResolutionBits)
Returns
System.Int32: A value corresponding to relative voltage level on specified device channel
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | channel | Channel to read - for differential inputs this represents a channel pair (valid values: 0 - channelcount - 1 or 0 - channelcount / 2 - 1 with differential inputs) |
| Meadow.Foundation.ICs.IOExpanders.Mcp3xxx.InputType | inputType | The type of input channel to read |
System.Int32 | adcResolutionBits | The number of bits in the returned value |
ReadInternalRaw(int, int, int)
Reads a value from the device
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protected int ReadInternalRaw(int adcRequest, int adcResolutionInBits, int delayBits)
Returns
System.Int32: A value corresponding to a voltage level on the input pin described by the request
Parameters
| Type | Name | Description |
|---|---|---|
System.Int32 | adcRequest | A bit pattern to be sent to the ADC |
System.Int32 | adcResolutionInBits | The number of bits in the returned value |
System.Int32 | delayBits | The number of bits to be delayed between the request and the response being read |
Dispose()
Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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public void Dispose()
Dispose(bool)
Dispose of the object
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protected virtual void Dispose(bool disposing)
Parameters
| Type | Name | Description |
|---|---|---|
System.Boolean | disposing | Is disposing |
Implements
Meadow.Hardware.IAnalogInputControllerMeadow.Hardware.IPinControllerMeadow.Hardware.ISpiPeripheralSystem.IDisposable