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https://github.com/wpilibsuite/allwpilib
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364 lines
11 KiB
C++
364 lines
11 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2008. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib. */
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/*----------------------------------------------------------------------------*/
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#include "Encoder.h"
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#include "Resource.h"
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#include "WPIErrors.h"
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#include "LiveWindow/LiveWindow.h"
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/**
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* Common initialization code for Encoders.
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* This code allocates resources for Encoders and is common to all constructors.
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* @param reverseDirection If true, counts down instead of up (this is all relative)
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* @param encodingType either k1X, k2X, or k4X to indicate 1X, 2X or 4X decoding. If 4X is
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* selected, then an encoder FPGA object is used and the returned counts will be 4x the encoder
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* spec'd value since all rising and falling edges are counted. If 1X or 2X are selected then
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* a counter object will be used and the returned value will either exactly match the spec'd count
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* or be double (2x) the spec'd count.
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*/
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void Encoder::InitEncoder(int channelA, int channelB, bool reverseDirection, EncodingType encodingType)
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{
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m_table = NULL;
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this->channelA = channelA;
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this->channelB = channelB;
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reversed = reverseDirection;
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m_encodingType = encodingType;
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int32_t index = 0;
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m_distancePerPulse = 1.0;
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m_pidSource = kDistance;
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LiveWindow::GetInstance()->AddSensor("Encoder", channelA, this);
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if (channelB < channelA) { // Swap ports
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int channel = channelB;
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channelB = channelA;
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channelA = channel;
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}
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char buffer[50];
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int n = sprintf(buffer, "dio/1/%d/1/%d", channelA, channelB);
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impl = new SimEncoder(buffer);
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}
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/**
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* Encoder constructor.
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* Construct a Encoder given a and b channels.
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* @param aChannel The a channel digital input channel.
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* @param bChannel The b channel digital input channel.
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* @param reverseDirection represents the orientation of the encoder and inverts the output values
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* if necessary so forward represents positive values.
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* @param encodingType either k1X, k2X, or k4X to indicate 1X, 2X or 4X decoding. If 4X is
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* selected, then an encoder FPGA object is used and the returned counts will be 4x the encoder
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* spec'd value since all rising and falling edges are counted. If 1X or 2X are selected then
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* a counter object will be used and the returned value will either exactly match the spec'd count
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* or be double (2x) the spec'd count.
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*/
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Encoder::Encoder(uint32_t aChannel, uint32_t bChannel, bool reverseDirection, EncodingType encodingType)
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{
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InitEncoder(aChannel, bChannel, reverseDirection, encodingType);
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}
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/**
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* Encoder constructor.
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* Construct a Encoder given a and b channels as digital inputs. This is used in the case
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* where the digital inputs are shared. The Encoder class will not allocate the digital inputs
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* and assume that they already are counted.
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* @param aSource The source that should be used for the a channel.
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* @param bSource the source that should be used for the b channel.
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* @param reverseDirection represents the orientation of the encoder and inverts the output values
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* if necessary so forward represents positive values.
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* @param encodingType either k1X, k2X, or k4X to indicate 1X, 2X or 4X decoding. If 4X is
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* selected, then an encoder FPGA object is used and the returned counts will be 4x the encoder
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* spec'd value since all rising and falling edges are counted. If 1X or 2X are selected then
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* a counter object will be used and the returned value will either exactly match the spec'd count
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* or be double (2x) the spec'd count.
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*/
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/* TODO: [Not Supported] Encoder::Encoder(DigitalSource *aSource, DigitalSource *bSource, bool reverseDirection, EncodingType encodingType) :
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m_encoder(NULL),
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m_counter(NULL)
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{
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m_aSource = aSource;
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m_bSource = bSource;
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m_allocatedASource = false;
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m_allocatedBSource = false;
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if (m_aSource == NULL || m_bSource == NULL)
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wpi_setWPIError(NullParameter);
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else
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InitEncoder(reverseDirection, encodingType);
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}*/
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/**
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* Encoder constructor.
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* Construct a Encoder given a and b channels as digital inputs. This is used in the case
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* where the digital inputs are shared. The Encoder class will not allocate the digital inputs
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* and assume that they already are counted.
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* @param aSource The source that should be used for the a channel.
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* @param bSource the source that should be used for the b channel.
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* @param reverseDirection represents the orientation of the encoder and inverts the output values
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* if necessary so forward represents positive values.
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* @param encodingType either k1X, k2X, or k4X to indicate 1X, 2X or 4X decoding. If 4X is
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* selected, then an encoder FPGA object is used and the returned counts will be 4x the encoder
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* spec'd value since all rising and falling edges are counted. If 1X or 2X are selected then
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* a counter object will be used and the returned value will either exactly match the spec'd count
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* or be double (2x) the spec'd count.
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*/
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/*// TODO: [Not Supported] Encoder::Encoder(DigitalSource &aSource, DigitalSource &bSource, bool reverseDirection, EncodingType encodingType) :
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m_encoder(NULL),
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m_counter(NULL)
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{
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m_aSource = &aSource;
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m_bSource = &bSource;
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m_allocatedASource = false;
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m_allocatedBSource = false;
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InitEncoder(reverseDirection, encodingType);
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}*/
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/**
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* Free the resources for an Encoder.
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* Frees the FPGA resources associated with an Encoder.
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*/
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Encoder::~Encoder()
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{
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}
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/**
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* Start the Encoder.
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* Starts counting pulses on the Encoder device.
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*/
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void Encoder::Start()
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{
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impl->Start();
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}
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/**
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* Stops counting pulses on the Encoder device. The value is not changed.
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*/
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void Encoder::Stop()
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{
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impl->Stop();
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}
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/**
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* Reset the Encoder distance to zero.
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* Resets the current count to zero on the encoder.
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*/
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void Encoder::Reset()
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{
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impl->Reset();
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}
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/**
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* Determine if the encoder is stopped.
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* Using the MaxPeriod value, a boolean is returned that is true if the encoder is considered
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* stopped and false if it is still moving. A stopped encoder is one where the most recent pulse
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* width exceeds the MaxPeriod.
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* @return True if the encoder is considered stopped.
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*/
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bool Encoder::GetStopped()
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* The last direction the encoder value changed.
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* @return The last direction the encoder value changed.
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*/
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bool Encoder::GetDirection()
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* The scale needed to convert a raw counter value into a number of encoder pulses.
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*/
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double Encoder::DecodingScaleFactor()
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{
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switch (m_encodingType)
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{
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case k1X:
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return 1.0;
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case k2X:
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return 0.5;
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case k4X:
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return 0.25;
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default:
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return 0.0;
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}
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}
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/**
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* Gets the raw value from the encoder.
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* The raw value is the actual count unscaled by the 1x, 2x, or 4x scale
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* factor.
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* @return Current raw count from the encoder
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*/
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int32_t Encoder::GetRaw()
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* Gets the current count.
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* Returns the current count on the Encoder.
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* This method compensates for the decoding type.
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*
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* @return Current count from the Encoder adjusted for the 1x, 2x, or 4x scale factor.
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*/
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int32_t Encoder::Get()
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* Returns the period of the most recent pulse.
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* Returns the period of the most recent Encoder pulse in seconds.
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* This method compenstates for the decoding type.
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*
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* @deprecated Use GetRate() in favor of this method. This returns unscaled periods and GetRate() scales using value from SetDistancePerPulse().
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*
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* @return Period in seconds of the most recent pulse.
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*/
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double Encoder::GetPeriod()
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* Sets the maximum period for stopped detection.
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* Sets the value that represents the maximum period of the Encoder before it will assume
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* that the attached device is stopped. This timeout allows users to determine if the wheels or
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* other shaft has stopped rotating.
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* This method compensates for the decoding type.
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*
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* @deprecated Use SetMinRate() in favor of this method. This takes unscaled periods and SetMinRate() scales using value from SetDistancePerPulse().
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*
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* @param maxPeriod The maximum time between rising and falling edges before the FPGA will
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* report the device stopped. This is expressed in seconds.
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*/
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void Encoder::SetMaxPeriod(double maxPeriod)
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* Get the distance the robot has driven since the last reset.
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*
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* @return The distance driven since the last reset as scaled by the value from SetDistancePerPulse().
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*/
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double Encoder::GetDistance()
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{
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return m_distancePerPulse * impl->GetPosition();
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}
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/**
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* Get the current rate of the encoder.
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* Units are distance per second as scaled by the value from SetDistancePerPulse().
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*
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* @return The current rate of the encoder.
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*/
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double Encoder::GetRate()
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{
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return m_distancePerPulse * impl->GetVelocity();
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}
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/**
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* Set the minimum rate of the device before the hardware reports it stopped.
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*
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* @param minRate The minimum rate. The units are in distance per second as scaled by the value from SetDistancePerPulse().
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*/
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void Encoder::SetMinRate(double minRate)
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* Set the distance per pulse for this encoder.
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* This sets the multiplier used to determine the distance driven based on the count value
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* from the encoder.
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* Do not include the decoding type in this scale. The library already compensates for the decoding type.
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* Set this value based on the encoder's rated Pulses per Revolution and
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* factor in gearing reductions following the encoder shaft.
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* This distance can be in any units you like, linear or angular.
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*
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* @param distancePerPulse The scale factor that will be used to convert pulses to useful units.
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*/
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void Encoder::SetDistancePerPulse(double distancePerPulse)
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{
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m_distancePerPulse = distancePerPulse;
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}
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/**
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* Set the direction sensing for this encoder.
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* This sets the direction sensing on the encoder so that it could count in the correct
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* software direction regardless of the mounting.
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* @param reverseDirection true if the encoder direction should be reversed
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*/
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void Encoder::SetReverseDirection(bool reverseDirection)
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{
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throw "Simulation doesn't currently support this method.";
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}
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/**
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* Set which parameter of the encoder you are using as a process control variable.
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*
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* @param pidSource An enum to select the parameter.
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*/
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void Encoder::SetPIDSourceParameter(PIDSourceParameter pidSource)
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{
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m_pidSource = pidSource;
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}
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/**
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* Implement the PIDSource interface.
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*
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* @return The current value of the selected source parameter.
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*/
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double Encoder::PIDGet()
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{
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switch (m_pidSource)
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{
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case kDistance:
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return GetDistance();
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case kRate:
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return GetRate();
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default:
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return 0.0;
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}
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}
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void Encoder::UpdateTable() {
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if (m_table != NULL) {
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m_table->PutNumber("Speed", GetRate());
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m_table->PutNumber("Distance", GetDistance());
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m_table->PutNumber("Distance per Tick", m_distancePerPulse);
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}
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}
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void Encoder::StartLiveWindowMode() {
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}
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void Encoder::StopLiveWindowMode() {
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}
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std::string Encoder::GetSmartDashboardType() {
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if (m_encodingType == k4X)
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return "Quadrature Encoder";
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else
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return "Encoder";
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}
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void Encoder::InitTable(ITable *subTable) {
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m_table = subTable;
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UpdateTable();
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}
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ITable * Encoder::GetTable() {
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return m_table;
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}
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