96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006-2007 Robert Keevil
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "system.h"
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#include "kernel.h"
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#include "piezo.h"
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static unsigned int duration;
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static bool beeping;
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void INT_TIMERD(void)
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{
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/* clear interrupt */
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TDCON = TDCON;
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if (!(--duration))
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{
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beeping = 0;
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TDCMD = (1 << 1); /* TD_CLR */
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}
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}
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void piezo_start(unsigned short cycles, unsigned short periods)
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{
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#ifndef SIMULATOR
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duration = periods;
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beeping = 1;
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/* configure timer for 100 kHz */
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TDCMD = (1 << 1); /* TD_CLR */
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TDPRE = 30 - 1; /* prescaler */
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TDCON = (1 << 13) | /* TD_INT1_EN */
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(0 << 12) | /* TD_INT0_EN */
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(0 << 11) | /* TD_START */
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(2 << 8) | /* TD_CS = PCLK / 16 */
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(1 << 4); /* TD_MODE_SEL = PWM mode */
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TDDATA0 = cycles; /* set interval period */
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TDDATA1 = cycles << 1; /* set interval period */
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TDCMD = (1 << 0); /* TD_EN */
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/* enable timer interrupt */
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INTMSK |= INTMSK_TIMERD;
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#endif
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}
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void piezo_stop(void)
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{
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#ifndef SIMULATOR
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TDCMD = (1 << 1); /* TD_CLR */
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#endif
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}
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void piezo_clear(void)
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{
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piezo_stop();
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}
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bool piezo_busy(void)
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{
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return beeping;
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}
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void piezo_init(void)
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{
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beeping = 0;
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}
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void piezo_button_beep(bool beep, bool force)
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{
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if (force)
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while (beeping)
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yield();
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if (!beeping)
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{
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if (beep)
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piezo_start(22, 457);
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else
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piezo_start(40, 4);
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}
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}
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