buzzer.c

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/*#*
 *#* $Log$
 *#* Revision 1.19  2006/07/19 12:56:25  bernie
 *#* Convert to new Doxygen style.
 *#*
 *#* Revision 1.18  2006/02/17 21:15:25  bernie
 *#* Add MOD_CHECK() checks.
 *#*
 *#* Revision 1.17  2006/02/10 12:30:18  bernie
 *#* Push interrupt protection inside hw module.
 *#*
 *#* Revision 1.16  2005/11/04 16:19:33  bernie
 *#* buz_init(): Restore IRQ protection as in project_bko.
 *#*
 *#* Revision 1.15  2005/06/27 21:25:50  bernie
 *#* Modularize hardware access; Port to new timer interface.
 *#*
 *#* Revision 1.14  2005/04/11 19:10:27  bernie
 *#* Include top-level headers from cfg/ subdir.
 *#*
 *#* Revision 1.13  2005/02/18 11:20:15  bernie
 *#* Use mware/event.h; Update copyright info.
 *#*
 *#* Revision 1.12  2004/12/13 12:07:06  bernie
 *#* DISABLE_IRQSAVE/ENABLE_IRQRESTORE: Convert to IRQ_SAVE_DISABLE/IRQ_RESTORE.
 *#*
 *#* Revision 1.11  2004/12/08 09:11:53  bernie
 *#* Rename time_t to mtime_t.
 *#*
 *#* Revision 1.10  2004/10/03 18:38:51  bernie
 *#* Add missing AVR header; Fix header.
 *#*
 *#* Revision 1.9  2004/09/14 21:01:25  bernie
 *#* Use new AVR port pin names.
 *#*/

#include "buzzer.h"

#include <hw_buzzer.h>
#include <drv/timer.h>

#include <mware/event.h>

#include <cfg/debug.h>
#include <cfg/module.h>


/* Local vars */
static Timer buz_timer;
static bool buz_timer_running;
static mtime_t buz_repeat_interval;
static mtime_t buz_repeat_duration;


static void buz_softint(void)
{
    if (IS_BUZZER_ON)
    {
        BUZZER_OFF;
        if (buz_repeat_interval)
        {
            /* Wait for interval time */
            timer_setDelay(&buz_timer, ms_to_ticks(buz_repeat_interval));
            timer_add(&buz_timer);
        }
        else
            buz_timer_running = false;
    }
    else if (buz_repeat_interval)
    {
        /* Wait for beep time */
        BUZZER_ON;
        timer_setDelay(&buz_timer, ms_to_ticks(buz_repeat_duration));
        timer_add(&buz_timer);
    }
    else
        buz_timer_running = false;
}


void buz_beep(mtime_t time)
{
    cpuflags_t flags;
    IRQ_SAVE_DISABLE(flags);

    /* Remove the software interrupt if it was already queued */
    if (buz_timer_running)
        timer_abort(&buz_timer);

    /* Turn on buzzer */
    BUZZER_ON;

    /* Add software interrupt to turn the buzzer off later */
    buz_timer_running = true;
    timer_setDelay(&buz_timer, ms_to_ticks(time));
    timer_add(&buz_timer);

    IRQ_RESTORE(flags);
}


void buz_repeat_start(mtime_t duration, mtime_t interval)
{
    buz_repeat_interval = interval;
    buz_repeat_duration = duration;
    buz_beep(duration);
}


void buz_repeat_stop(void)
{
    cpuflags_t flags;
    IRQ_SAVE_DISABLE(flags);

    /* Remove the software interrupt if it was already queued */
    if (buz_timer_running)
    {
        timer_abort(&buz_timer);
        buz_timer_running = false;
    }

    buz_repeat_interval = 0;
    BUZZER_OFF;

    IRQ_RESTORE(flags);
}

MOD_DEFINE(buzzer)


void buz_init(void)
{
    MOD_CHECK(timer);

    BUZZER_HW_INIT;

    /* Init software interrupt. */
    timer_set_event_softint(&buz_timer, (Hook)buz_softint, 0);

    MOD_INIT(buzzer);
}