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#ifndef CYGONCE_IO_WALLCLOCK_HXX

#define CYGONCE_IO_WALLCLOCK_HXX

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

//

//      wallclock.hxx

//

//      Wallclock interface declaration

//

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

//####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.

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

//####ECOSGPLCOPYRIGHTEND####

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

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

//

// Author(s):     nickg

// Contributors:  nickg

// Date:          1999-03-05

// Purpose:       Wall Clock declarations

// Description:   This file defines the interface to the wall clock device

//                that provides real time stamps. Actual implementations of

//                this driver can be found in devs/wallclock.

// Usage:         #include 

//

//####DESCRIPTIONEND####

//

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

#include 

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

// Wallclock class

class Cyg_WallClock

{

public:

    Cyg_WallClock();

    // Returns the number of seconds elapsed since 1970-01-01 00:00:00.

    // This may involve reading the hardware, so it may take anything

    // up to a second to complete.

    cyg_uint32 get_current_time();

    // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.

    // This may involve writing to the hardware, so it may take

    // anything up to a second to complete.

    void set_current_time( cyg_uint32 time_stamp );

    // A static pointer to the single system defined wall clock device.

    static Cyg_WallClock *wallclock;

private:

    // Functions implemented by the hardware-specific part of the

    // driver.

    // Note: While the API specifies elapsed time since 1970-01-01

    // 00:00:00 this is only an actual requirement if the driver is

    // used in set-get mode - in init-get mode, the upper layer of the

    // driver only needs to know the number of elapsed seconds between

    // the init_hw_seconds and get_hw_seconds calls; the hardware

    // epoch base is factored out, so the driver can use any base

    // desired (see the emulated device).

    // Called to initialize the hardware clock to a known sane state, or

    // simply to make sure it can be accessed in set-get mode.

    void init_hw_seconds( void );

    // Returns the number of seconds elapsed since 1970-01-01 00:00:00.

    // (or any desired epoch when in init-get mode)

    cyg_uint32 get_hw_seconds( void );

#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE

    // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.

    void set_hw_seconds( cyg_uint32 secs );

#endif

};

#endif // ifndef CYGONCE_DEVS_WALLCLOCK_HXX

// EOF wallclock.hxx