示例#1
0
 /**
  * Free the PWM channel.
  *
  * <p>Free the resource associated with the PWM channel and set the value to 0.
  */
 public void free() {
   if (m_port == 0) return;
   PWMJNI.setPWM(m_port, (short) 0);
   PWMJNI.freePWMChannel(m_port);
   PWMJNI.freeDIO(m_port);
   DIOJNI.freeDigitalPort(m_port);
   m_port = 0;
 }
示例#2
0
  /**
   * Initialize PWMs given a channel.
   *
   * <p>This method is private and is the common path for all the constructors for creating PWM
   * instances. Checks channel value ranges and allocates the appropriate channel. The allocation is
   * only done to help users ensure that they don't double assign channels. $
   *
   * @param channel The PWM channel number. 0-9 are on-board, 10-19 are on the MXP port
   */
  private void initPWM(final int channel) {
    checkPWMChannel(channel);
    m_channel = channel;

    m_port = DIOJNI.initializeDigitalPort(DIOJNI.getPort((byte) m_channel));

    if (!PWMJNI.allocatePWMChannel(m_port)) {
      throw new AllocationException("PWM channel " + channel + " is already allocated");
    }

    PWMJNI.setPWM(m_port, (short) 0);

    m_eliminateDeadband = false;

    UsageReporting.report(tResourceType.kResourceType_PWM, channel);
  }
示例#3
0
  /**
   * Set the PWM value based on a speed.
   *
   * <p>This is intended to be used by speed controllers.
   *
   * @pre SetMaxPositivePwm() called.
   * @pre SetMinPositivePwm() called.
   * @pre SetCenterPwm() called.
   * @pre SetMaxNegativePwm() called.
   * @pre SetMinNegativePwm() called.
   * @param speed The speed to set the speed controller between -1.0 and 1.0.
   */
  final void setSpeed(double speed) {
    // clamp speed to be in the range 1.0 >= speed >= -1.0
    if (speed < -1.0) {
      speed = -1.0;
    } else if (speed > 1.0) {
      speed = 1.0;
    }

    // // calculate the desired output pwm value by scaling the speed
    // appropriately
    // int rawValue;
    // if (speed == 0.0) {
    // rawValue = getCenterPwm();
    // } else if (speed > 0.0) {
    // rawValue =
    // (int) (speed * ((double) getPositiveScaleFactor()) + ((double)
    // getMinPositivePwm()) + 0.5);
    // } else {
    // rawValue =
    // (int) (speed * ((double) getNegativeScaleFactor()) + ((double)
    // getMaxNegativePwm()) + 0.5);
    // }
    //
    // // send the computed pwm value to the FPGA
    // setRaw(rawValue);

    // The above is too complicated to simulate, just fake it
    PWMJNI.__setPWM(m_port, speed);
  }
示例#4
0
 /**
  * Slow down the PWM signal for old devices.
  *
  * @param mult The period multiplier to apply to this channel
  */
 public void setPeriodMultiplier(PeriodMultiplier mult) {
   switch (mult.value) {
     case PeriodMultiplier.k4X_val:
       // Squelch 3 out of 4 outputs
       PWMJNI.setPWMPeriodScale(m_port, 3);
       break;
     case PeriodMultiplier.k2X_val:
       // Squelch 1 out of 2 outputs
       PWMJNI.setPWMPeriodScale(m_port, 1);
       break;
     case PeriodMultiplier.k1X_val:
       // Don't squelch any outputs
       PWMJNI.setPWMPeriodScale(m_port, 0);
       break;
     default:
       // Cannot hit this, limited by PeriodMultiplier enum
   }
 }
示例#5
0
  /**
   * Get the PWM value in terms of speed.
   *
   * <p>This is intended to be used by speed controllers.
   *
   * @pre SetMaxPositivePwm() called.
   * @pre SetMinPositivePwm() called.
   * @pre SetMaxNegativePwm() called.
   * @pre SetMinNegativePwm() called.
   * @return The most recently set speed between -1.0 and 1.0.
   */
  public double getSpeed() {
    // int value = getRaw();
    // if (value > getMaxPositivePwm()) {
    // return 1.0;
    // } else if (value < getMinNegativePwm()) {
    // return -1.0;
    // } else if (value > getMinPositivePwm()) {
    // return (double) (value - getMinPositivePwm()) / (double)
    // getPositiveScaleFactor();
    // } else if (value < getMaxNegativePwm()) {
    // return (double) (value - getMaxNegativePwm()) / (double)
    // getNegativeScaleFactor();
    // } else {
    // return 0.0;
    // }

    // The above is too complicated to simulate, just fake it
    return PWMJNI.__getPWM(m_port);
  }
示例#6
0
 protected void setZeroLatch() {
   PWMJNI.latchPWMZero(m_port);
 }
示例#7
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 /**
  * Get the PWM value directly from the hardware.
  *
  * <p>Read a raw value from a PWM channel.
  *
  * @return Raw PWM control value. Range: 0 - 255.
  */
 public int getRaw() {
   return PWMJNI.getPWM(m_port);
 }
示例#8
0
 /**
  * Set the PWM value directly to the hardware.
  *
  * <p>Write a raw value to a PWM channel.
  *
  * @param value Raw PWM value. Range 0 - 255.
  */
 public void setRaw(int value) {
   PWMJNI.setPWM(m_port, (short) value);
 }