e29619b4d2
Based on the piezo driver for the nano2g. Signed-off-by: Nils Wallménius <nils@rockbox.org>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/***************************************************************************
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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_TIMERA(void)
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{
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/* clear interrupt */
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TACON = TACON;
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if (!(--duration))
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{
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beeping = 0;
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TACMD = (1 << 1); /* TA_CLR */
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}
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}
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static 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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TACMD = (1 << 1); /* TA_CLR */
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TAPRE = 30 - 1; /* prescaler */ /* 12 MHz / 4 / 30 = 100 kHz */
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TACON = (1 << 13) | /* TA_INT1_EN */
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(0 << 12) | /* TA_INT0_EN */
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(0 << 11) | /* TA_START */
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(1 << 8) | /* TA_CS = PCLK / 4 */
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(1 << 6) | /* UNKNOWN bit */ /* external 12 MHz clock ??? */
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(1 << 4); /* TA_MODE_SEL = PWM mode */
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TADATA0 = cycles; /* set interval period */
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TADATA1 = cycles << 1; /* set interval period */
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TACMD = (1 << 0); /* TA_EN */
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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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TACMD = (1 << 1); /* TA_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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