94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/*
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* Copyright (c) 2008 Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* \brief
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* This file implements a beep function to emit a beep sound from Raven's
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* speaker.
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*
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* \author
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* Mike Vidales mavida404@gmail.com
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*
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*/
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#include "beep.h"
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#include "key.h"
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/**
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* \addtogroup lcd
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* \{
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Emits a beep from the Raven's buzzer. This routine simply toggles a port pin
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* at an audio frequency, which causes a tone to be emitted from the Raven's speaker.
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* The beep consists of two tones at two different frequencies. At the end, the beeper
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* port pin is kept low, which causes the speaker amplifier to shut down.
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*/
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void
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beep(void)
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{
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uint8_t i;
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volatile uint8_t j;
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/* Turn on the power to the speaker. */
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ENTER_DDR |= (1 << PE7);
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ENTER_PUR |= (1 << PE7);
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/* Setup port pin */
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BEEP_DDR |= (1 << BEEP_BIT);
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for (i=0;i<100;i++){
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/* Toggle port pin */
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BEEP_PIN |= (1 << BEEP_BIT);
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/* Delay loop */
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for (j=0;j<0xff;j++)
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;
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}
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for (i=0;i<100;i++){
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/* Toggle port pin */
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BEEP_PIN |= (1 << BEEP_BIT);
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/* Delay loop */
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for (j=0;j<0xa0;j++)
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;
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}
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/* Turn off speaker */
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BEEP_PORT &= ~(1 << BEEP_BIT);
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ENTER_PUR &= ~(1 << PE7);
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}
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/** \} */
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