wpilibc/Athena/src/Joystick.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 "Joystick.h"
#include "DriverStation.h"
#include "WPIErrors.h"
#include <math.h>
#include <string.h>

const uint32_t Joystick::kDefaultXAxis;
const uint32_t Joystick::kDefaultYAxis;
const uint32_t Joystick::kDefaultZAxis;
const uint32_t Joystick::kDefaultTwistAxis;
const uint32_t Joystick::kDefaultThrottleAxis;
const uint32_t Joystick::kDefaultTriggerButton;
const uint32_t Joystick::kDefaultTopButton;
static Joystick *joysticks[DriverStation::kJoystickPorts];
static bool joySticksInitialized = false;

/**
 * Construct an instance of a joystick.
 * The joystick index is the usb port on the drivers station.
 *
 * @param port The port on the driver station that the joystick is plugged into
 * (0-5).
 */
Joystick::Joystick(uint32_t port)
    : Joystick(port, kNumAxisTypes, kNumButtonTypes) {
  m_axes[kXAxis] = kDefaultXAxis;
  m_axes[kYAxis] = kDefaultYAxis;
  m_axes[kZAxis] = kDefaultZAxis;
  m_axes[kTwistAxis] = kDefaultTwistAxis;
  m_axes[kThrottleAxis] = kDefaultThrottleAxis;

  m_buttons[kTriggerButton] = kDefaultTriggerButton;
  m_buttons[kTopButton] = kDefaultTopButton;

  HALReport(HALUsageReporting::kResourceType_Joystick, port);
}

/**
 * Version of the constructor to be called by sub-classes.
 *
 * This constructor allows the subclass to configure the number of constants
 * for axes and buttons.
 *
 * @param port The port on the driver station that the joystick is plugged into.
 * @param numAxisTypes The number of axis types in the enum.
 * @param numButtonTypes The number of button types in the enum.
 */
Joystick::Joystick(uint32_t port, uint32_t numAxisTypes,
                   uint32_t numButtonTypes)
    : m_ds(DriverStation::GetInstance()),
      m_port(port),
      m_axes(numAxisTypes),
      m_buttons(numButtonTypes) {
  if (!joySticksInitialized) {
    for (auto& joystick : joysticks) joystick = nullptr;
    joySticksInitialized = true;
  }
  if (m_port >= DriverStation::kJoystickPorts) {
    wpi_setWPIError(BadJoystickIndex);
  } else {
    joysticks[m_port] = this;
  }
}

Joystick *Joystick::GetStickForPort(uint32_t port) {
  Joystick *stick = joysticks[port];
  if (stick == nullptr) {
    stick = new Joystick(port);
    joysticks[port] = stick;
  }
  return stick;
}

/**
 * Get the X value of the joystick.
 * This depends on the mapping of the joystick connected to the current port.
 * @param hand This parameter is ignored for the Joystick class and is only here
 * to complete the GenericHID interface.
 */
float Joystick::GetX(JoystickHand hand) const {
  return GetRawAxis(m_axes[kXAxis]);
}

/**
 * Get the Y value of the joystick.
 * This depends on the mapping of the joystick connected to the current port.
 * @param hand This parameter is ignored for the Joystick class and is only here
 * to complete the GenericHID interface.
 */
float Joystick::GetY(JoystickHand hand) const {
  return GetRawAxis(m_axes[kYAxis]);
}

/**
 * Get the Z value of the current joystick.
 * This depends on the mapping of the joystick connected to the current port.
 */
float Joystick::GetZ() const { return GetRawAxis(m_axes[kZAxis]); }

/**
 * Get the twist value of the current joystick.
 * This depends on the mapping of the joystick connected to the current port.
 */
float Joystick::GetTwist() const { return GetRawAxis(m_axes[kTwistAxis]); }

/**
 * Get the throttle value of the current joystick.
 * This depends on the mapping of the joystick connected to the current port.
 */
float Joystick::GetThrottle() const {
  return GetRawAxis(m_axes[kThrottleAxis]);
}

/**
 * Get the value of the axis.
 *
 * @param axis The axis to read, starting at 0.
 * @return The value of the axis.
 */
float Joystick::GetRawAxis(uint32_t axis) const {
  return m_ds.GetStickAxis(m_port, axis);
}

/**
 * For the current joystick, return the axis determined by the argument.
 *
 * This is for cases where the joystick axis is returned programatically,
 * otherwise one of the
 * previous functions would be preferable (for example GetX()).
 *
 * @param axis The axis to read.
 * @return The value of the axis.
 */
float Joystick::GetAxis(AxisType axis) const {
  switch (axis) {
    case kXAxis:
      return this->GetX();
    case kYAxis:
      return this->GetY();
    case kZAxis:
      return this->GetZ();
    case kTwistAxis:
      return this->GetTwist();
    case kThrottleAxis:
      return this->GetThrottle();
    default:
      wpi_setWPIError(BadJoystickAxis);
      return 0.0;
  }
}

/**
 * Read the state of the trigger on the joystick.
 *
 * Look up which button has been assigned to the trigger and read its state.
 *
 * @param hand This parameter is ignored for the Joystick class and is only here
 * to complete the GenericHID interface.
 * @return The state of the trigger.
 */
bool Joystick::GetTrigger(JoystickHand hand) const {
  return GetRawButton(m_buttons[kTriggerButton]);
}

/**
 * Read the state of the top button on the joystick.
 *
 * Look up which button has been assigned to the top and read its state.
 *
 * @param hand This parameter is ignored for the Joystick class and is only here
 * to complete the GenericHID interface.
 * @return The state of the top button.
 */
bool Joystick::GetTop(JoystickHand hand) const {
  return GetRawButton(m_buttons[kTopButton]);
}

/**
 * This is not supported for the Joystick.
 * This method is only here to complete the GenericHID interface.
 */
bool Joystick::GetBumper(JoystickHand hand) const {
  // Joysticks don't have bumpers.
  return false;
}

/**
 * Get the button value (starting at button 1)
 *
 * The buttons are returned in a single 16 bit value with one bit representing
 * the state
 * of each button. The appropriate button is returned as a boolean value.
 *
 * @param button The button number to be read (starting at 1)
 * @return The state of the button.
 **/
bool Joystick::GetRawButton(uint32_t button) const {
  return m_ds.GetStickButton(m_port, button);
}

/**
 * Get the state of a POV on the joystick.
 *
 * @param pov The index of the POV to read (starting at 0)
 * @return the angle of the POV in degrees, or -1 if the POV is not pressed.
 */
int Joystick::GetPOV(uint32_t pov) const {
  return m_ds.GetStickPOV(m_port, pov);
}

/**
 * Get buttons based on an enumerated type.
 *
 * The button type will be looked up in the list of buttons and then read.
 *
 * @param button The type of button to read.
 * @return The state of the button.
 */
bool Joystick::GetButton(ButtonType button) const {
  switch (button) {
    case kTriggerButton:
      return GetTrigger();
    case kTopButton:
      return GetTop();
    default:
      return false;
  }
}

/**
 * Get the number of axis for a joystick
 *
 * @return the number of axis for the current joystick
 */
int Joystick::GetAxisCount() const { return m_ds.GetStickAxisCount(m_port); }

/**
 * Get the value of isXbox for the joystick.
 *
 * @return A boolean that is true if the joystick is an xbox controller.
 */
bool Joystick::GetIsXbox() const { return m_ds.GetJoystickIsXbox(m_port); }

/**
 * Get the HID type of the controller.
 *
 * @return the HID type of the controller.
 */
Joystick::HIDType Joystick::GetType() const {
  return static_cast<HIDType>(m_ds.GetJoystickType(m_port));
}

/**
 * Get the name of the joystick.
 *
 * @return the name of the controller.
 */
std::string Joystick::GetName() const { return m_ds.GetJoystickName(m_port); }

// int Joystick::GetAxisType(uint8_t axis) const
//{
//	return m_ds.GetJoystickAxisType(m_port, axis);
//}

/**
  * Get the number of axis for a joystick
  *
* @return the number of buttons on the current joystick
 */
int Joystick::GetButtonCount() const {
  return m_ds.GetStickButtonCount(m_port);
}

/**
 * Get the number of axis for a joystick
 *
 * @return then umber of POVs for the current joystick
 */
int Joystick::GetPOVCount() const { return m_ds.GetStickPOVCount(m_port); }

/**
 * Get the channel currently associated with the specified axis.
 *
 * @param axis The axis to look up the channel for.
 * @return The channel fr the axis.
 */
uint32_t Joystick::GetAxisChannel(AxisType axis) const { return m_axes[axis]; }

/**
 * Set the channel associated with a specified axis.
 *
 * @param axis The axis to set the channel for.
 * @param channel The channel to set the axis to.
 */
void Joystick::SetAxisChannel(AxisType axis, uint32_t channel) {
  m_axes[axis] = channel;
}

/**
 * Get the magnitude of the direction vector formed by the joystick's
 * current position relative to its origin
 *
 * @return The magnitude of the direction vector
 */
float Joystick::GetMagnitude() const {
  return sqrt(pow(GetX(), 2) + pow(GetY(), 2));
}

/**
 * Get the direction of the vector formed by the joystick and its origin
 * in radians
 *
 * @return The direction of the vector in radians
 */
float Joystick::GetDirectionRadians() const { return atan2(GetX(), -GetY()); }

/**
 * Get the direction of the vector formed by the joystick and its origin
 * in degrees
 *
 * uses acos(-1) to represent Pi due to absence of readily accessible Pi
 * constant in C++
 *
 * @return The direction of the vector in degrees
 */
float Joystick::GetDirectionDegrees() const {
  return (180 / acos(-1)) * GetDirectionRadians();
}

/**
 * Set the rumble output for the joystick. The DS currently supports 2 rumble
 * values,
 * left rumble and right rumble
 * @param type Which rumble value to set
 * @param value The normalized value (0 to 1) to set the rumble to
 */
void Joystick::SetRumble(RumbleType type, float value) {
  if (value < 0)
    value = 0;
  else if (value > 1)
    value = 1;
  if (type == kLeftRumble)
    m_leftRumble = value * 65535;
  else
    m_rightRumble = value * 65535;
  HALSetJoystickOutputs(m_port, m_outputs, m_leftRumble, m_rightRumble);
}

/**
 * Set a single HID output value for the joystick.
 * @param outputNumber The index of the output to set (1-32)
 * @param value The value to set the output to
 */

void Joystick::SetOutput(uint8_t outputNumber, bool value) {
  m_outputs =
      (m_outputs & ~(1 << (outputNumber - 1))) | (value << (outputNumber - 1));

  HALSetJoystickOutputs(m_port, m_outputs, m_leftRumble, m_rightRumble);
}

/**
 * Set all HID output values for the joystick.
 * @param value The 32 bit output value (1 bit for each output)
 */
void Joystick::SetOutputs(uint32_t value) {
  m_outputs = value;
  HALSetJoystickOutputs(m_port, m_outputs, m_leftRumble, m_rightRumble);
}