96 lines
2.4 KiB
C
96 lines
2.4 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_TIMERA(void)
|
||
|
|
{
|
||
|
|
/* clear interrupt */
|
||
|
|
TACON = TACON;
|
||
|
|
if (!(--duration))
|
||
|
|
{
|
||
|
|
beeping = 0;
|
||
|
|
TACMD = (1 << 1); /* TA_CLR */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void piezo_start(unsigned short cycles, unsigned short periods)
|
||
|
|
{
|
||
|
|
#ifndef SIMULATOR
|
||
|
|
duration = periods;
|
||
|
|
beeping = 1;
|
||
|
|
/* configure timer for 100 kHz */
|
||
|
|
TACMD = (1 << 1); /* TA_CLR */
|
||
|
|
TAPRE = 30 - 1; /* prescaler */ /* 12 MHz / 4 / 30 = 100 kHz */
|
||
|
|
TACON = (1 << 13) | /* TA_INT1_EN */
|
||
|
|
(0 << 12) | /* TA_INT0_EN */
|
||
|
|
(0 << 11) | /* TA_START */
|
||
|
|
(1 << 8) | /* TA_CS = PCLK / 4 */
|
||
|
|
(1 << 6) | /* UNKNOWN bit */ /* external 12 MHz clock ??? */
|
||
|
|
(1 << 4); /* TA_MODE_SEL = PWM mode */
|
||
|
|
TADATA0 = cycles; /* set interval period */
|
||
|
|
TADATA1 = cycles << 1; /* set interval period */
|
||
|
|
TACMD = (1 << 0); /* TA_EN */
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
void piezo_stop(void)
|
||
|
|
{
|
||
|
|
#ifndef SIMULATOR
|
||
|
|
TACMD = (1 << 1); /* TA_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);
|
||
|
|
}
|
||
|
|
}
|