Subversion Repositories openrisc_me

//==========================================================================

//

//      common/timer.cxx

//

//      Timer class implementations

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos 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 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   dsm

// Contributors:        dsm

// Date:        1998-06-11

// Purpose:     Clock class implementation

// Description: This file implements the Timer class which is derived from

//              the Alarm class to support uITRON type functionality

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/kernel.h>

#include <cyg/kernel/ktypes.h>         // base kernel types

#include <cyg/infra/cyg_trac.h>        // tracing macros

#include <cyg/infra/cyg_ass.h>         // assertion macros

#include <cyg/kernel/clock.hxx>

#include <cyg/kernel/timer.hxx>

#include <cyg/kernel/clock.inl>        // Clock inlines

// -------------------------------------------------------------------------

Cyg_Timer::Cyg_Timer()

{

}

Cyg_Timer::~Cyg_Timer()

{

    CYG_REPORT_FUNCTION();

    disable();

    counter = NULL;

}

// -------------------------------------------------------------------------

void

Cyg_Timer::initialize(

        Cyg_Counter    *c,

        cyg_alarm_fn   a,

        CYG_ADDRWORD   d,

        cyg_tick_count t,               // absolute time

        cyg_tick_count i,               // 0 => one shot, else repeating

        cyg_uint32     action           // (DISABLE | ENABLE)

        )

{

    CYG_REPORT_FUNCTION();

    counter  = c;

    alarm    = a;

    data     = d;

    trigger  = t;

    interval = i;

    enabled  = false;

    CYG_ASSERT(0 == (action & ~ENABLE), "unknown action");

    if(action & ENABLE)

        enable();

}

void

Cyg_Timer::activate(cyg_uint32 action)  // (DISABLE | ENABLE) [|RESET]

{

    // we must also disable the alarm when resetting it so as to remove it

    // from its queue, so that the enable afterwards places it on the right

    // queue instead of assuming that, being enabled, it's already there.

    // (if not enabling, the behaviour is unchanged and correct)

    if(!(action & ENABLE) || (action & RESET) )

        disable(); // otherwise, the enable below does nothing...

    if((action & RESET))

    {

        cyg_tick_count t;

        t = counter->current_value();

        trigger = t + interval;

    }

    if((action & ENABLE)) {

        enable(); // ...when it should put the timer on a new queue.

    }

}

// -------------------------------------------------------------------------

// EOF common/timer.cxx