wpilibc/simulation/src/Relay.cpp

/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2008-2016. All Rights Reserved.                        */
/* Open Source Software - may be modified and shared by FRC teams. The code   */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project.                                                               */
/*----------------------------------------------------------------------------*/

#include "Relay.h"

#include "MotorSafetyHelper.h"
//#include "NetworkCommunication/UsageReporting.h"
#include "WPIErrors.h"
#include "LiveWindow/LiveWindow.h"

/**
 * Relay constructor given a channel.
 *
 * This code initializes the relay and reserves all resources that need to be
 * locked. Initially the relay is set to both lines at 0v.
 * @param channel The channel number (0-3).
 * @param direction The direction that the Relay object will control.
 */
Relay::Relay(uint32_t channel, Relay::Direction direction)
	: m_channel (channel)
	, m_direction (direction)
{
	char buf[64];
	if (!SensorBase::CheckRelayChannel(m_channel))
	{
		snprintf(buf, 64, "Relay Channel %d", m_channel);
		wpi_setWPIErrorWithContext(ChannelIndexOutOfRange, buf);
		return;
	}

    m_safetyHelper = std::make_unique<MotorSafetyHelper>(this);
    m_safetyHelper->SetSafetyEnabled(false);

	sprintf(buf, "relay/%d", m_channel);
	impl = new SimContinuousOutput(buf); // TODO: Allow two different relays (targetting the different halves of a relay) to be combined to control one motor.
	LiveWindow::GetInstance()->AddActuator("Relay", 1, m_channel, this);
	go_pos = go_neg = false;
}

/**
 * Free the resource associated with a relay.
 * The relay channels are set to free and the relay output is turned off.
 */
Relay::~Relay()
{
	impl->Set(0);
	if (m_table != nullptr) m_table->RemoveTableListener(this);
}

/**
 * Set the relay state.
 *
 * Valid values depend on which directions of the relay are controlled by the object.
 *
 * When set to kBothDirections, the relay can be any of the four states:
 *    0v-0v, 0v-12v, 12v-0v, 12v-12v
 *
 * When set to kForwardOnly or kReverseOnly, you can specify the constant for the
 *    direction or you can simply specify kOff and kOn.  Using only kOff and kOn is
 *    recommended.
 *
 * @param value The state to set the relay.
 */
void Relay::Set(Relay::Value value)
{
	switch (value)
	{
	case kOff:
		if (m_direction == kBothDirections || m_direction == kForwardOnly)
		{
			go_pos = false;
		}
		if (m_direction == kBothDirections || m_direction == kReverseOnly)
		{
			go_neg = false;
		}
		break;
	case kOn:
		if (m_direction == kBothDirections || m_direction == kForwardOnly)
		{
			go_pos = true;
		}
		if (m_direction == kBothDirections || m_direction == kReverseOnly)
		{
			go_neg = true;
		}
		break;
	case kForward:
		if (m_direction == kReverseOnly)
		{
			wpi_setWPIError(IncompatibleMode);
			break;
		}
		if (m_direction == kBothDirections || m_direction == kForwardOnly)
		{
			go_pos = true;
		}
		if (m_direction == kBothDirections)
		{
			go_neg = false;
		}
		break;
	case kReverse:
		if (m_direction == kForwardOnly)
		{
			wpi_setWPIError(IncompatibleMode);
			break;
		}
		if (m_direction == kBothDirections)
		{
			go_pos = false;
		}
		if (m_direction == kBothDirections || m_direction == kReverseOnly)
		{
			go_neg = true;
		}
		break;
	}
	impl->Set((go_pos ? 1 : 0) + (go_neg ? -1 : 0));
}

/**
 * Get the Relay State
 *
 * Gets the current state of the relay.
 *
 * When set to kForwardOnly or kReverseOnly, value is returned as kOn/kOff not
 * kForward/kReverse (per the recommendation in Set)
 *
 * @return The current state of the relay as a Relay::Value
 */
Relay::Value Relay::Get() const {
	// TODO: Don't assume that the go_pos and go_neg fields are correct?
	if ((go_pos || m_direction == kReverseOnly) && (go_neg || m_direction == kForwardOnly)) {
		return kOn;
	} else if (go_pos) {
		return kForward;
	} else if (go_neg) {
		return kReverse;
	} else {
		return kOff;
	}
}

uint32_t Relay::GetChannel() const {
  return m_channel;
}

/**
 * Set the expiration time for the Relay object
 * @param timeout The timeout (in seconds) for this relay object
 */
void Relay::SetExpiration(float timeout) {
  m_safetyHelper->SetExpiration(timeout);
}

/**
 * Return the expiration time for the relay object.
 * @return The expiration time value.
 */
float Relay::GetExpiration() const { return m_safetyHelper->GetExpiration(); }

/**
 * Check if the relay object is currently alive or stopped due to a timeout.
 * @returns a bool value that is true if the motor has NOT timed out and should
 * still be running.
 */
bool Relay::IsAlive() const { return m_safetyHelper->IsAlive(); }

/**
 * Stop the motor associated with this PWM object.
 * This is called by the MotorSafetyHelper object when it has a timeout for this
 * relay and needs to stop it from running.
 */
void Relay::StopMotor() { Set(kOff); }

/**
 * Enable/disable motor safety for this device
 * Turn on and off the motor safety option for this relay object.
 * @param enabled True if motor safety is enforced for this object
 */
void Relay::SetSafetyEnabled(bool enabled) {
  m_safetyHelper->SetSafetyEnabled(enabled);
}

/**
 * Check if motor safety is enabled for this object
 * @returns True if motor safety is enforced for this object
 */
bool Relay::IsSafetyEnabled() const {
  return m_safetyHelper->IsSafetyEnabled();
}

void Relay::GetDescription(std::ostringstream& desc) const {
  desc << "Relay " << GetChannel();
}

void Relay::ValueChanged(ITable* source, llvm::StringRef key,
                         std::shared_ptr<nt::Value> value, bool isNew) {
  if (!value->IsString()) return;
  if (value->GetString() == "Off") Set(kOff);
  else if (value->GetString() == "Forward") Set(kForward);
  else if (value->GetString() == "Reverse") Set(kReverse);
}

void Relay::UpdateTable() {
	if(m_table != nullptr){
		if (Get() == kOn) {
			m_table->PutString("Value", "On");
		}
		else if (Get() == kForward) {
			m_table->PutString("Value", "Forward");
		}
		else if (Get() == kReverse) {
			m_table->PutString("Value", "Reverse");
		}
		else {
			m_table->PutString("Value", "Off");
		}
	}
}

void Relay::StartLiveWindowMode() {
	if(m_table != nullptr){
		m_table->AddTableListener("Value", this, true);
	}
}

void Relay::StopLiveWindowMode() {
	if(m_table != nullptr){
		m_table->RemoveTableListener(this);
	}
}

std::string Relay::GetSmartDashboardType() const {
	return "Relay";
}

void Relay::InitTable(std::shared_ptr<ITable> subTable) {
	m_table = subTable;
	UpdateTable();
}

std::shared_ptr<ITable> Relay::GetTable() const {
	return m_table;
}