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[/] [openrisc/] [trunk/] [rtos/] [ecos-3.0/] [packages/] [io/] [wallclock/] [current/] [src/] [wallclock.cxx] - Rev 825
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//========================================================================== // // devs/wallclock/wallclock.cxx // // Wallclock base // //========================================================================== // ####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2009 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): jskov // Contributors: jskov // Date: 2000-03-28 // Purpose: Wallclock base driver // Description: This provides a generic wallclock base driver which // relies on sub-drivers to provide the interface functions // to the hardware device (see wallclock.hxx for details). // // The driver can be configured to run in one of two modes: // init-get mode: // In this mode, the hardware driver only needs to // implement a function to read the hardware clock // and a (possibly empty) init function which makes // sure the hardware clock is properly initialized. // While the driver in this mode has a smaller memory // foot-print, it does not support battery-backed up // clocks. // // set-get mode: // Requires both set and get functions for the hardware // device. While bigger, it allows support of // battery-backed up clocks. // // //####DESCRIPTIONEND#### // //========================================================================== #include <pkgconf/wallclock.h> // Wallclock device config #include <cyg/infra/cyg_type.h> // Common type definitions and support #include <cyg/hal/drv_api.h> // Driver API #include <cyg/io/wallclock.hxx> // The WallClock API //----------------------------------------------------------------------------- // Local static variables static Cyg_WallClock wallclock_instance CYGBLD_ATTRIB_INIT_PRI( CYG_INIT_DEV_WALLCLOCK ); #ifndef CYGSEM_WALLCLOCK_SET_GET_MODE static cyg_uint32 epoch_ticks; static cyg_uint32 epoch_time_stamp; #endif static cyg_drv_mutex_t wallclock_lock; Cyg_WallClock *Cyg_WallClock::wallclock; //----------------------------------------------------------------------------- // Constructor Cyg_WallClock::Cyg_WallClock() { // install instance pointer wallclock = &wallclock_instance; // Initialize lock used for mutually exclusive access to hardware cyg_drv_mutex_init(&wallclock_lock); // Always allow low-level driver to initialize clock, even though it // may not be necessary for set-get mode. init_hw_seconds(); } //----------------------------------------------------------------------------- // 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 Cyg_WallClock::get_current_time() { cyg_uint32 res; while (!cyg_drv_mutex_lock(&wallclock_lock)); #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE res = get_hw_seconds(); #else res = epoch_time_stamp + get_hw_seconds() - epoch_ticks; #endif cyg_drv_mutex_unlock(&wallclock_lock); return res; } //----------------------------------------------------------------------------- // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00. // This may involve reading or writing to the hardware, so it may take // anything up to a second to complete. void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp ) { while (!cyg_drv_mutex_lock(&wallclock_lock)); #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE set_hw_seconds(time_stamp); #else epoch_time_stamp = time_stamp; epoch_ticks = get_hw_seconds(); #endif cyg_drv_mutex_unlock(&wallclock_lock); } //----------------------------------------------------------------------------- // End of devs/wallclock/wallclock.cxx
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