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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [io/] [watchdog/] [v2_0/] [src/] [emulate.cxx] - Rev 232
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//========================================================================== // // io/watchdog/emulate.cxx // // Watchdog implementation emulation // //========================================================================== //####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): nickg // Contributors: nickg // Date: 1998-07-29 // Purpose: Watchdog class implementation // Description: Contains an implementation of the Watchdog class for use // when there is no hardware watchdog timer. Instead it is // emulated using an Alarm object. // //####DESCRIPTIONEND#### // //========================================================================== #include <pkgconf/watchdog.h> // watchdog configuration file #include <pkgconf/kernel.h> // Kernel config #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/instrmnt.h> // instrumentation #include <cyg/kernel/clock.hxx> // clock and alarm #include <cyg/kernel/sched.hxx> // scheduler #include <cyg/io/watchdog.hxx> // watchdog API #include <cyg/kernel/sched.inl> // scheduler inlines // ------------------------------------------------------------------------- // Forward definitions static cyg_alarm_fn watchdog_alarm; // ------------------------------------------------------------------------- // Statics static Cyg_Alarm alarm( Cyg_Clock::real_time_clock, watchdog_alarm, 0 ); // One second's worth of ticks. static cyg_tick_count one_sec; // ------------------------------------------------------------------------- // HW init void Cyg_Watchdog::init_hw(void) { CYG_REPORT_FUNCTION(); Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution(); one_sec = ( res.divisor * 1000000000LL ) / res.dividend ; resolution = 1000000000LL; CYG_REPORT_RETURN(); } // ------------------------------------------------------------------------- // Start the watchdog running. void Cyg_Watchdog::start() { CYG_REPORT_FUNCTION(); Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution(); // Set alarm to a one second single-shot trigger alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 ); CYG_REPORT_RETURN(); } // ------------------------------------------------------------------------- // Reset watchdog timer. This needs to be called regularly to prevent // the watchdog firing. void Cyg_Watchdog::reset() { CYG_REPORT_FUNCTION(); Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution(); Cyg_Scheduler::lock(); // Set alarm to a one second single-shot trigger alarm.initialize( Cyg_Clock::real_time_clock->current_value() + one_sec, 0 ); Cyg_Scheduler::unlock(); CYG_REPORT_RETURN(); } // ------------------------------------------------------------------------- // Alarm function void watchdog_alarm( Cyg_Alarm *a, CYG_ADDRWORD data) { CYG_REPORT_FUNCTION(); // Disable alarm just in case alarm.disable(); Cyg_Watchdog::watchdog.trigger(); } // ------------------------------------------------------------------------- // EOF watchdog/emulate.cxx
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