ea2a3ee7a8
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30996 a1c6a512-1295-4272-9138-f99709370657
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2006-2007 Robert Keevil
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include "system.h"
|
|
#include "kernel.h"
|
|
#include "piezo.h"
|
|
|
|
static unsigned int duration;
|
|
static bool beeping;
|
|
|
|
void INT_TIMERD(void)
|
|
{
|
|
/* clear interrupt */
|
|
TDCON = TDCON;
|
|
if (!(--duration))
|
|
{
|
|
beeping = 0;
|
|
TDCMD = (1 << 1); /* TD_CLR */
|
|
}
|
|
}
|
|
|
|
void piezo_start(unsigned short cycles, unsigned short periods)
|
|
{
|
|
#ifndef SIMULATOR
|
|
duration = periods;
|
|
beeping = 1;
|
|
/* configure timer for 100 kHz */
|
|
TDCMD = (1 << 1); /* TD_CLR */
|
|
TDPRE = 30 - 1; /* prescaler */
|
|
TDCON = (1 << 13) | /* TD_INT1_EN */
|
|
(0 << 12) | /* TD_INT0_EN */
|
|
(0 << 11) | /* TD_START */
|
|
(2 << 8) | /* TD_CS = PCLK / 16 */
|
|
(1 << 4); /* TD_MODE_SEL = PWM mode */
|
|
TDDATA0 = cycles; /* set interval period */
|
|
TDDATA1 = cycles << 1; /* set interval period */
|
|
TDCMD = (1 << 0); /* TD_EN */
|
|
|
|
/* enable timer interrupt */
|
|
INTMSK |= INTMSK_TIMERD;
|
|
#endif
|
|
}
|
|
|
|
void piezo_stop(void)
|
|
{
|
|
#ifndef SIMULATOR
|
|
TDCMD = (1 << 1); /* TD_CLR */
|
|
#endif
|
|
}
|
|
|
|
void piezo_clear(void)
|
|
{
|
|
piezo_stop();
|
|
}
|
|
|
|
bool piezo_busy(void)
|
|
{
|
|
return beeping;
|
|
}
|
|
|
|
void piezo_init(void)
|
|
{
|
|
beeping = 0;
|
|
}
|
|
|
|
void piezo_button_beep(bool beep, bool force)
|
|
{
|
|
if (force)
|
|
while (beeping)
|
|
yield();
|
|
|
|
if (!beeping)
|
|
{
|
|
if (beep)
|
|
piezo_start(22, 457);
|
|
else
|
|
piezo_start(40, 4);
|
|
}
|
|
}
|