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//==========================================================================
//
// 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 Free Software Foundation, 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public 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
|
