/*********************************************************************
 *
 * $Id: YBuzzer.java 28738 2017-10-03 08:06:35Z seb $
 *
 * Implements FindBuzzer(), the high-level API for Buzzer functions
 *
 * - - - - - - - - - License information: - - - - - - - - -
 *
 *  Copyright (C) 2011 and beyond by Yoctopuce Sarl, Switzerland.
 *
 *  Yoctopuce Sarl (hereafter Licensor) grants to you a perpetual
 *  non-exclusive license to use, modify, copy and integrate this
 *  file into your software for the sole purpose of interfacing
 *  with Yoctopuce products.
 *
 *  You may reproduce and distribute copies of this file in
 *  source or object form, as long as the sole purpose of this
 *  code is to interface with Yoctopuce products. You must retain
 *  this notice in the distributed source file.
 *
 *  You should refer to Yoctopuce General Terms and Conditions
 *  for additional information regarding your rights and
 *  obligations.
 *
 *  THE SOFTWARE AND DOCUMENTATION ARE PROVIDED 'AS IS' WITHOUT
 *  WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
 *  WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS
 *  FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO
 *  EVENT SHALL LICENSOR BE LIABLE FOR ANY INCIDENTAL, SPECIAL,
 *  INDIRECT OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA,
 *  COST OF PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR
 *  SERVICES, ANY CLAIMS BY THIRD PARTIES (INCLUDING BUT NOT
 *  LIMITED TO ANY DEFENSE THEREOF), ANY CLAIMS FOR INDEMNITY OR
 *  CONTRIBUTION, OR OTHER SIMILAR COSTS, WHETHER ASSERTED ON THE
 *  BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE), BREACH OF
 *  WARRANTY, OR OTHERWISE.
 *
 *********************************************************************/

package com.yoctopuce.YoctoAPI;
import java.util.Locale;

//--- (YBuzzer return codes)
//--- (end of YBuzzer return codes)
//--- (YBuzzer class start)
/**
 * YBuzzer Class: Buzzer function interface
 *
 * The Yoctopuce application programming interface allows you to
 * choose the frequency and volume at which the buzzer must sound.
 * You can also pre-program a play sequence.
 */
@SuppressWarnings({"UnusedDeclaration", "UnusedAssignment"})
public class YBuzzer extends YFunction
{
//--- (end of YBuzzer class start)
//--- (YBuzzer definitions)
    /**
     * invalid frequency value
     */
    public static final double FREQUENCY_INVALID = YAPI.INVALID_DOUBLE;
    /**
     * invalid volume value
     */
    public static final int VOLUME_INVALID = YAPI.INVALID_UINT;
    /**
     * invalid playSeqSize value
     */
    public static final int PLAYSEQSIZE_INVALID = YAPI.INVALID_UINT;
    /**
     * invalid playSeqMaxSize value
     */
    public static final int PLAYSEQMAXSIZE_INVALID = YAPI.INVALID_UINT;
    /**
     * invalid playSeqSignature value
     */
    public static final int PLAYSEQSIGNATURE_INVALID = YAPI.INVALID_UINT;
    /**
     * invalid command value
     */
    public static final String COMMAND_INVALID = YAPI.INVALID_STRING;
    protected double _frequency = FREQUENCY_INVALID;
    protected int _volume = VOLUME_INVALID;
    protected int _playSeqSize = PLAYSEQSIZE_INVALID;
    protected int _playSeqMaxSize = PLAYSEQMAXSIZE_INVALID;
    protected int _playSeqSignature = PLAYSEQSIGNATURE_INVALID;
    protected String _command = COMMAND_INVALID;
    protected UpdateCallback _valueCallbackBuzzer = null;

    /**
     * Deprecated UpdateCallback for Buzzer
     */
    public interface UpdateCallback
    {
        /**
         *
         * @param function      : the function object of which the value has changed
         * @param functionValue : the character string describing the new advertised value
         */
        void yNewValue(YBuzzer function, String functionValue);
    }

    /**
     * TimedReportCallback for Buzzer
     */
    public interface TimedReportCallback
    {
        /**
         *
         * @param function : the function object of which the value has changed
         * @param measure  : measure
         */
        void timedReportCallback(YBuzzer  function, YMeasure measure);
    }
    //--- (end of YBuzzer definitions)


    /**
     *
     * @param func : functionid
     */
    protected YBuzzer(YAPIContext ctx, String func)
    {
        super(ctx, func);
        _className = "Buzzer";
        //--- (YBuzzer attributes initialization)
        //--- (end of YBuzzer attributes initialization)
    }

    /**
     *
     * @param func : functionid
     */
    protected YBuzzer(String func)
    {
        this(YAPI.GetYCtx(true), func);
    }

    //--- (YBuzzer implementation)
    @SuppressWarnings("EmptyMethod")
    @Override
    protected void  _parseAttr(YJSONObject json_val) throws Exception
    {
        if (json_val.has("frequency")) {
            _frequency = Math.round(json_val.getDouble("frequency") * 1000.0 / 65536.0) / 1000.0;
        }
        if (json_val.has("volume")) {
            _volume = json_val.getInt("volume");
        }
        if (json_val.has("playSeqSize")) {
            _playSeqSize = json_val.getInt("playSeqSize");
        }
        if (json_val.has("playSeqMaxSize")) {
            _playSeqMaxSize = json_val.getInt("playSeqMaxSize");
        }
        if (json_val.has("playSeqSignature")) {
            _playSeqSignature = json_val.getInt("playSeqSignature");
        }
        if (json_val.has("command")) {
            _command = json_val.getString("command");
        }
        super._parseAttr(json_val);
    }

    /**
     * Changes the frequency of the signal sent to the buzzer. A zero value stops the buzzer.
     *
     * @param newval : a floating point number corresponding to the frequency of the signal sent to the buzzer
     *
     * @return YAPI.SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int set_frequency(double  newval)  throws YAPI_Exception
    {
        String rest_val;
        synchronized (this) {
            rest_val = Long.toString(Math.round(newval * 65536.0));
            _setAttr("frequency",rest_val);
        }
        return YAPI.SUCCESS;
    }

    /**
     * Changes the frequency of the signal sent to the buzzer. A zero value stops the buzzer.
     *
     * @param newval : a floating point number corresponding to the frequency of the signal sent to the buzzer
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int setFrequency(double newval)  throws YAPI_Exception
    {
        return set_frequency(newval);
    }

    /**
     * Returns the  frequency of the signal sent to the buzzer/speaker.
     *
     * @return a floating point number corresponding to the  frequency of the signal sent to the buzzer/speaker
     *
     * @throws YAPI_Exception on error
     */
    public double get_frequency() throws YAPI_Exception
    {
        double res;
        synchronized (this) {
            if (_cacheExpiration <= YAPIContext.GetTickCount()) {
                if (load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS) {
                    return FREQUENCY_INVALID;
                }
            }
            res = _frequency;
        }
        return res;
    }

    /**
     * Returns the  frequency of the signal sent to the buzzer/speaker.
     *
     * @return a floating point number corresponding to the  frequency of the signal sent to the buzzer/speaker
     *
     * @throws YAPI_Exception on error
     */
    public double getFrequency() throws YAPI_Exception
    {
        return get_frequency();
    }

    /**
     * Returns the volume of the signal sent to the buzzer/speaker.
     *
     * @return an integer corresponding to the volume of the signal sent to the buzzer/speaker
     *
     * @throws YAPI_Exception on error
     */
    public int get_volume() throws YAPI_Exception
    {
        int res;
        synchronized (this) {
            if (_cacheExpiration <= YAPIContext.GetTickCount()) {
                if (load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS) {
                    return VOLUME_INVALID;
                }
            }
            res = _volume;
        }
        return res;
    }

    /**
     * Returns the volume of the signal sent to the buzzer/speaker.
     *
     * @return an integer corresponding to the volume of the signal sent to the buzzer/speaker
     *
     * @throws YAPI_Exception on error
     */
    public int getVolume() throws YAPI_Exception
    {
        return get_volume();
    }

    /**
     * Changes the volume of the signal sent to the buzzer/speaker.
     *
     * @param newval : an integer corresponding to the volume of the signal sent to the buzzer/speaker
     *
     * @return YAPI.SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int set_volume(int  newval)  throws YAPI_Exception
    {
        String rest_val;
        synchronized (this) {
            rest_val = Integer.toString(newval);
            _setAttr("volume",rest_val);
        }
        return YAPI.SUCCESS;
    }

    /**
     * Changes the volume of the signal sent to the buzzer/speaker.
     *
     * @param newval : an integer corresponding to the volume of the signal sent to the buzzer/speaker
     *
     * @return YAPI_SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int setVolume(int newval)  throws YAPI_Exception
    {
        return set_volume(newval);
    }

    /**
     * Returns the current length of the playing sequence.
     *
     * @return an integer corresponding to the current length of the playing sequence
     *
     * @throws YAPI_Exception on error
     */
    public int get_playSeqSize() throws YAPI_Exception
    {
        int res;
        synchronized (this) {
            if (_cacheExpiration <= YAPIContext.GetTickCount()) {
                if (load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS) {
                    return PLAYSEQSIZE_INVALID;
                }
            }
            res = _playSeqSize;
        }
        return res;
    }

    /**
     * Returns the current length of the playing sequence.
     *
     * @return an integer corresponding to the current length of the playing sequence
     *
     * @throws YAPI_Exception on error
     */
    public int getPlaySeqSize() throws YAPI_Exception
    {
        return get_playSeqSize();
    }

    /**
     * Returns the maximum length of the playing sequence.
     *
     * @return an integer corresponding to the maximum length of the playing sequence
     *
     * @throws YAPI_Exception on error
     */
    public int get_playSeqMaxSize() throws YAPI_Exception
    {
        int res;
        synchronized (this) {
            if (_cacheExpiration == 0) {
                if (load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS) {
                    return PLAYSEQMAXSIZE_INVALID;
                }
            }
            res = _playSeqMaxSize;
        }
        return res;
    }

    /**
     * Returns the maximum length of the playing sequence.
     *
     * @return an integer corresponding to the maximum length of the playing sequence
     *
     * @throws YAPI_Exception on error
     */
    public int getPlaySeqMaxSize() throws YAPI_Exception
    {
        return get_playSeqMaxSize();
    }

    /**
     * Returns the playing sequence signature. As playing
     * sequences cannot be read from the device, this can be used
     * to detect if a specific playing sequence is already
     * programmed.
     *
     * @return an integer corresponding to the playing sequence signature
     *
     * @throws YAPI_Exception on error
     */
    public int get_playSeqSignature() throws YAPI_Exception
    {
        int res;
        synchronized (this) {
            if (_cacheExpiration <= YAPIContext.GetTickCount()) {
                if (load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS) {
                    return PLAYSEQSIGNATURE_INVALID;
                }
            }
            res = _playSeqSignature;
        }
        return res;
    }

    /**
     * Returns the playing sequence signature. As playing
     * sequences cannot be read from the device, this can be used
     * to detect if a specific playing sequence is already
     * programmed.
     *
     * @return an integer corresponding to the playing sequence signature
     *
     * @throws YAPI_Exception on error
     */
    public int getPlaySeqSignature() throws YAPI_Exception
    {
        return get_playSeqSignature();
    }

    public String get_command() throws YAPI_Exception
    {
        String res;
        synchronized (this) {
            if (_cacheExpiration <= YAPIContext.GetTickCount()) {
                if (load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS) {
                    return COMMAND_INVALID;
                }
            }
            res = _command;
        }
        return res;
    }

    public int set_command(String  newval)  throws YAPI_Exception
    {
        String rest_val;
        synchronized (this) {
            rest_val = newval;
            _setAttr("command",rest_val);
        }
        return YAPI.SUCCESS;
    }


    /**
     * Retrieves a buzzer for a given identifier.
     * The identifier can be specified using several formats:
     * <ul>
     * <li>FunctionLogicalName</li>
     * <li>ModuleSerialNumber.FunctionIdentifier</li>
     * <li>ModuleSerialNumber.FunctionLogicalName</li>
     * <li>ModuleLogicalName.FunctionIdentifier</li>
     * <li>ModuleLogicalName.FunctionLogicalName</li>
     * </ul>
     *
     * This function does not require that the buzzer is online at the time
     * it is invoked. The returned object is nevertheless valid.
     * Use the method YBuzzer.isOnline() to test if the buzzer is
     * indeed online at a given time. In case of ambiguity when looking for
     * a buzzer by logical name, no error is notified: the first instance
     * found is returned. The search is performed first by hardware name,
     * then by logical name.
     *
     * If a call to this object's is_online() method returns FALSE although
     * you are certain that the matching device is plugged, make sure that you did
     * call registerHub() at application initialization time.
     *
     * @param func : a string that uniquely characterizes the buzzer
     *
     * @return a YBuzzer object allowing you to drive the buzzer.
     */
    public static YBuzzer FindBuzzer(String func)
    {
        YBuzzer obj;
        synchronized (YAPI.class) {
            obj = (YBuzzer) YFunction._FindFromCache("Buzzer", func);
            if (obj == null) {
                obj = new YBuzzer(func);
                YFunction._AddToCache("Buzzer", func, obj);
            }
        }
        return obj;
    }

    /**
     * Retrieves a buzzer for a given identifier in a YAPI context.
     * The identifier can be specified using several formats:
     * <ul>
     * <li>FunctionLogicalName</li>
     * <li>ModuleSerialNumber.FunctionIdentifier</li>
     * <li>ModuleSerialNumber.FunctionLogicalName</li>
     * <li>ModuleLogicalName.FunctionIdentifier</li>
     * <li>ModuleLogicalName.FunctionLogicalName</li>
     * </ul>
     *
     * This function does not require that the buzzer is online at the time
     * it is invoked. The returned object is nevertheless valid.
     * Use the method YBuzzer.isOnline() to test if the buzzer is
     * indeed online at a given time. In case of ambiguity when looking for
     * a buzzer by logical name, no error is notified: the first instance
     * found is returned. The search is performed first by hardware name,
     * then by logical name.
     *
     * @param yctx : a YAPI context
     * @param func : a string that uniquely characterizes the buzzer
     *
     * @return a YBuzzer object allowing you to drive the buzzer.
     */
    public static YBuzzer FindBuzzerInContext(YAPIContext yctx,String func)
    {
        YBuzzer obj;
        synchronized (yctx) {
            obj = (YBuzzer) YFunction._FindFromCacheInContext(yctx, "Buzzer", func);
            if (obj == null) {
                obj = new YBuzzer(yctx, func);
                YFunction._AddToCache("Buzzer", func, obj);
            }
        }
        return obj;
    }

    /**
     * Registers the callback function that is invoked on every change of advertised value.
     * The callback is invoked only during the execution of ySleep or yHandleEvents.
     * This provides control over the time when the callback is triggered. For good responsiveness, remember to call
     * one of these two functions periodically. To unregister a callback, pass a null pointer as argument.
     *
     * @param callback : the callback function to call, or a null pointer. The callback function should take two
     *         arguments: the function object of which the value has changed, and the character string describing
     *         the new advertised value.
     *
     */
    public int registerValueCallback(UpdateCallback callback)
    {
        String val;
        if (callback != null) {
            YFunction._UpdateValueCallbackList(this, true);
        } else {
            YFunction._UpdateValueCallbackList(this, false);
        }
        _valueCallbackBuzzer = callback;
        // Immediately invoke value callback with current value
        if (callback != null && isOnline()) {
            val = _advertisedValue;
            if (!(val.equals(""))) {
                _invokeValueCallback(val);
            }
        }
        return 0;
    }

    @Override
    public int _invokeValueCallback(String value)
    {
        if (_valueCallbackBuzzer != null) {
            _valueCallbackBuzzer.yNewValue(this, value);
        } else {
            super._invokeValueCallback(value);
        }
        return 0;
    }

    public int sendCommand(String command) throws YAPI_Exception
    {
        return set_command(command);
    }

    /**
     * Adds a new frequency transition to the playing sequence.
     *
     * @param freq    : desired frequency when the transition is completed, in Hz
     * @param msDelay : duration of the frequency transition, in milliseconds.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int addFreqMoveToPlaySeq(int freq,int msDelay) throws YAPI_Exception
    {
        return sendCommand(String.format(Locale.US, "A%d,%d",freq,msDelay));
    }

    /**
     * Adds a pulse to the playing sequence.
     *
     * @param freq : pulse frequency, in Hz
     * @param msDuration : pulse duration, in milliseconds.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int addPulseToPlaySeq(int freq,int msDuration) throws YAPI_Exception
    {
        return sendCommand(String.format(Locale.US, "B%d,%d",freq,msDuration));
    }

    /**
     * Adds a new volume transition to the playing sequence. Frequency stays untouched:
     * if frequency is at zero, the transition has no effect.
     *
     * @param volume    : desired volume when the transition is completed, as a percentage.
     * @param msDuration : duration of the volume transition, in milliseconds.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int addVolMoveToPlaySeq(int volume,int msDuration) throws YAPI_Exception
    {
        return sendCommand(String.format(Locale.US, "C%d,%d",volume,msDuration));
    }

    /**
     * Adds notes to the playing sequence. Notes are provided as text words, separated by
     * spaces. The pitch is specified using the usual letter from A to G. The duration is
     * specified as the divisor of a whole note: 4 for a fourth, 8 for an eight note, etc.
     * Some modifiers are supported: # and b to alter a note pitch,
     * ' and , to move to the upper/lower octave, . to enlarge
     * the note duration.
     *
     * @param notes : notes to be played, as a text string.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int addNotesToPlaySeq(String notes) throws YAPI_Exception
    {
        int tempo;
        int prevPitch;
        int prevDuration;
        int prevFreq;
        int note;
        int num;
        int typ;
        byte[] ascNotes;
        int notesLen;
        int i;
        int ch;
        int dNote;
        int pitch;
        int freq;
        int ms;
        int ms16;
        int rest;
        tempo = 100;
        prevPitch = 3;
        prevDuration = 4;
        prevFreq = 110;
        note = -99;
        num = 0;
        typ = 3;
        ascNotes = (notes).getBytes();
        notesLen = (ascNotes).length;
        i = 0;
        while (i < notesLen) {
            ch = (ascNotes[i] & 0xff);
            // A (note))
            if (ch == 65) {
                note = 0;
            }
            // B (note)
            if (ch == 66) {
                note = 2;
            }
            // C (note)
            if (ch == 67) {
                note = 3;
            }
            // D (note)
            if (ch == 68) {
                note = 5;
            }
            // E (note)
            if (ch == 69) {
                note = 7;
            }
            // F (note)
            if (ch == 70) {
                note = 8;
            }
            // G (note)
            if (ch == 71) {
                note = 10;
            }
            // '#' (sharp modifier)
            if (ch == 35) {
                note = note + 1;
            }
            // 'b' (flat modifier)
            if (ch == 98) {
                note = note - 1;
            }
            // ' (octave up)
            if (ch == 39) {
                prevPitch = prevPitch + 12;
            }
            // , (octave down)
            if (ch == 44) {
                prevPitch = prevPitch - 12;
            }
            // R (rest)
            if (ch == 82) {
                typ = 0;
            }
            // ! (staccato modifier)
            if (ch == 33) {
                typ = 1;
            }
            // ^ (short modifier)
            if (ch == 94) {
                typ = 2;
            }
            // _ (legato modifier)
            if (ch == 95) {
                typ = 4;
            }
            // - (glissando modifier)
            if (ch == 45) {
                typ = 5;
            }
            // % (tempo change)
            if ((ch == 37) && (num > 0)) {
                tempo = num;
                num = 0;
            }
            if ((ch >= 48) && (ch <= 57)) {
                // 0-9 (number)
                num = (num * 10) + (ch - 48);
            }
            if (ch == 46) {
                // . (duration modifier)
                num = ((num * 2) / (3));
            }
            if (((ch == 32) || (i+1 == notesLen)) && ((note > -99) || (typ != 3))) {
                if (num == 0) {
                    num = prevDuration;
                } else {
                    prevDuration = num;
                }
                ms = (int) (double)Math.round(320000.0 / (tempo * num));
                if (typ == 0) {
                    addPulseToPlaySeq(0, ms);
                } else {
                    dNote = note - (((prevPitch) % (12)));
                    if (dNote > 6) {
                        dNote = dNote - 12;
                    }
                    if (dNote <= -6) {
                        dNote = dNote + 12;
                    }
                    pitch = prevPitch + dNote;
                    freq = (int) (double)Math.round(440 * java.lang.Math.exp(pitch * 0.05776226504666));
                    ms16 = ((ms) >> (4));
                    rest = 0;
                    if (typ == 3) {
                        rest = 2 * ms16;
                    }
                    if (typ == 2) {
                        rest = 8 * ms16;
                    }
                    if (typ == 1) {
                        rest = 12 * ms16;
                    }
                    if (typ == 5) {
                        addPulseToPlaySeq(prevFreq, ms16);
                        addFreqMoveToPlaySeq(freq, 8 * ms16);
                        addPulseToPlaySeq(freq, ms - 9 * ms16);
                    } else {
                        addPulseToPlaySeq(freq, ms - rest);
                        if (rest > 0) {
                            addPulseToPlaySeq(0, rest);
                        }
                    }
                    prevFreq = freq;
                    prevPitch = pitch;
                }
                note = -99;
                num = 0;
                typ = 3;
            }
            i = i + 1;
        }
        return YAPI.SUCCESS;
    }

    /**
     * Starts the preprogrammed playing sequence. The sequence
     * runs in loop until it is stopped by stopPlaySeq or an explicit
     * change. To play the sequence only once, use oncePlaySeq().
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int startPlaySeq() throws YAPI_Exception
    {
        return sendCommand("S");
    }

    /**
     * Stops the preprogrammed playing sequence and sets the frequency to zero.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int stopPlaySeq() throws YAPI_Exception
    {
        return sendCommand("X");
    }

    /**
     * Resets the preprogrammed playing sequence and sets the frequency to zero.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int resetPlaySeq() throws YAPI_Exception
    {
        return sendCommand("Z");
    }

    /**
     * Starts the preprogrammed playing sequence and run it once only.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int oncePlaySeq() throws YAPI_Exception
    {
        return sendCommand("s");
    }

    /**
     * Activates the buzzer for a short duration.
     *
     * @param frequency : pulse frequency, in hertz
     * @param duration : pulse duration in millseconds
     *
     * @return YAPI.SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int pulse(int frequency,int duration) throws YAPI_Exception
    {
        return set_command(String.format(Locale.US, "P%d,%d",frequency,duration));
    }

    /**
     * Makes the buzzer frequency change over a period of time.
     *
     * @param frequency : frequency to reach, in hertz. A frequency under 25Hz stops the buzzer.
     * @param duration :  pulse duration in millseconds
     *
     * @return YAPI.SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int freqMove(int frequency,int duration) throws YAPI_Exception
    {
        return set_command(String.format(Locale.US, "F%d,%d",frequency,duration));
    }

    /**
     * Makes the buzzer volume change over a period of time, frequency  stays untouched.
     *
     * @param volume : volume to reach in %
     * @param duration : change duration in millseconds
     *
     * @return YAPI.SUCCESS if the call succeeds.
     *
     * @throws YAPI_Exception on error
     */
    public int volumeMove(int volume,int duration) throws YAPI_Exception
    {
        return set_command(String.format(Locale.US, "V%d,%d",volume,duration));
    }

    /**
     * Immediately play a note sequence. Notes are provided as text words, separated by
     * spaces. The pitch is specified using the usual letter from A to G. The duration is
     * specified as the divisor of a whole note: 4 for a fourth, 8 for an eight note, etc.
     * Some modifiers are supported: # and b to alter a note pitch,
     * ' and , to move to the upper/lower octave, . to enlarge
     * the note duration.
     *
     * @param notes : notes to be played, as a text string.
     *
     * @return YAPI.SUCCESS if the call succeeds.
     * @throws YAPI_Exception on error
     */
    public int playNotes(String notes) throws YAPI_Exception
    {
        resetPlaySeq();
        addNotesToPlaySeq(notes);
        return oncePlaySeq();
    }

    /**
     * Continues the enumeration of buzzers started using yFirstBuzzer().
     *
     * @return a pointer to a YBuzzer object, corresponding to
     *         a buzzer currently online, or a null pointer
     *         if there are no more buzzers to enumerate.
     */
    public YBuzzer nextBuzzer()
    {
        String next_hwid;
        try {
            String hwid = _yapi._yHash.resolveHwID(_className, _func);
            next_hwid = _yapi._yHash.getNextHardwareId(_className, hwid);
        } catch (YAPI_Exception ignored) {
            next_hwid = null;
        }
        if(next_hwid == null) return null;
        return FindBuzzerInContext(_yapi, next_hwid);
    }

    /**
     * Starts the enumeration of buzzers currently accessible.
     * Use the method YBuzzer.nextBuzzer() to iterate on
     * next buzzers.
     *
     * @return a pointer to a YBuzzer object, corresponding to
     *         the first buzzer currently online, or a null pointer
     *         if there are none.
     */
    public static YBuzzer FirstBuzzer()
    {
        YAPIContext yctx = YAPI.GetYCtx(false);
        if (yctx == null)  return null;
        String next_hwid = yctx._yHash.getFirstHardwareId("Buzzer");
        if (next_hwid == null)  return null;
        return FindBuzzerInContext(yctx, next_hwid);
    }

    /**
     * Starts the enumeration of buzzers currently accessible.
     * Use the method YBuzzer.nextBuzzer() to iterate on
     * next buzzers.
     *
     * @param yctx : a YAPI context.
     *
     * @return a pointer to a YBuzzer object, corresponding to
     *         the first buzzer currently online, or a null pointer
     *         if there are none.
     */
    public static YBuzzer FirstBuzzerInContext(YAPIContext yctx)
    {
        String next_hwid = yctx._yHash.getFirstHardwareId("Buzzer");
        if (next_hwid == null)  return null;
        return FindBuzzerInContext(yctx, next_hwid);
    }

    //--- (end of YBuzzer implementation)
}

