/*
 *  Copyright (c) 2008  Swedish Institute of Computer Science
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/**
 * \file
 *
 * \brief
 *      This file implements a beep function to emit a beep sound from Raven's
 *      speaker.
 *
 * \author
 *      Mike Vidales mavida404@gmail.com
 *
 */


#include "beep.h"
#include "key.h"

/**
 *  \addtogroup lcd
 *  \{
*/

/*---------------------------------------------------------------------------*/

/**
 *  \brief Emits a beep from the Raven's buzzer.  This routine simply toggles a port pin
 *  at an audio frequency, which causes a tone to be emitted from the Raven's speaker.
 *  The beep consists of two tones at two different frequencies.  At the end, the beeper
 *  port pin is kept low, which causes the speaker amplifier to shut down.
*/
void
beep(void)
{
    uint8_t i;
    volatile uint8_t j;

    /* Turn on the power to the speaker. */
    ENTER_DDR |= (1 << PE7);
    ENTER_PUR |= (1 << PE7);

    /* Setup port pin */
    BEEP_DDR |= (1 << BEEP_BIT);

    for (i=0;i<100;i++){
        /* Toggle port pin */
        BEEP_PIN |= (1 << BEEP_BIT);
        /* Delay loop */
        for (j=0;j<0xff;j++)
            ;
    }

    for (i=0;i<100;i++){
        /* Toggle port pin */
        BEEP_PIN |= (1 << BEEP_BIT);
        /* Delay loop */
        for (j=0;j<0xa0;j++)
            ;
    }

    /* Turn off speaker */
    BEEP_PORT &= ~(1 << BEEP_BIT);
    ENTER_PUR &= ~(1 << PE7);
}

/** \}   */