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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
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1 #ifndef CYGONCE_IO_WALLCLOCK_HXX
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2 #define CYGONCE_IO_WALLCLOCK_HXX
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3
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4 //==========================================================================
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5 //
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6 // wallclock.hxx
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7 //
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8 // Wallclock interface declaration
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9 //
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10 //==========================================================================
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11 //####ECOSGPLCOPYRIGHTBEGIN####
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12 // -------------------------------------------
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13 // This file is part of eCos, the Embedded Configurable Operating System.
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14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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15 //
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16 // eCos is free software; you can redistribute it and/or modify it under
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17 // the terms of the GNU General Public License as published by the Free
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18 // Software Foundation; either version 2 or (at your option) any later version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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21 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License along
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26 // with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use macros
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30 // or inline functions from this file, or you compile this file and link it
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31 // with other works to produce a work based on this file, this file does not
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32 // by itself cause the resulting work to be covered by the GNU General Public
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33 // License. However the source code for this file must still be made available
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34 // in accordance with section (3) of the GNU General Public License.
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35 //
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36 // This exception does not invalidate any other reasons why a work based on
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37 // this file might be covered by the GNU General Public License.
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38 //
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39 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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40 // at http://sources.redhat.com/ecos/ecos-license/
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41 // -------------------------------------------
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42 //####ECOSGPLCOPYRIGHTEND####
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43 //==========================================================================
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44 //#####DESCRIPTIONBEGIN####
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45 //
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46 // Author(s): nickg
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47 // Contributors: nickg
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48 // Date: 1999-03-05
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49 // Purpose: Wall Clock declarations
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50 // Description: This file defines the interface to the wall clock device
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51 // that provides real time stamps. Actual implementations of
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52 // this driver can be found in devs/wallclock.
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53 // Usage: #include <cyg/io/wallclock.hxx>
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54 //
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55 //####DESCRIPTIONEND####
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56 //
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57 //==========================================================================
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58
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59 #include <cyg/infra/cyg_type.h>
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60
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61 // -------------------------------------------------------------------------
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62 // Wallclock class
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63
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64 class Cyg_WallClock
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65 {
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66
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67 public:
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68
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69 Cyg_WallClock();
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70
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71 // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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72 // This may involve reading the hardware, so it may take anything
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73 // up to a second to complete.
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74 cyg_uint32 get_current_time();
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75
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76 // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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77 // This may involve writing to the hardware, so it may take
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78 // anything up to a second to complete.
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79 void set_current_time( cyg_uint32 time_stamp );
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81 // A static pointer to the single system defined wall clock device.
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82 static Cyg_WallClock *wallclock;
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83
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84 private:
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85
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86 // Functions implemented by the hardware-specific part of the
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87 // driver.
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88
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89 // Note: While the API specifies elapsed time since 1970-01-01
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90 // 00:00:00 this is only an actual requirement if the driver is
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91 // used in set-get mode - in init-get mode, the upper layer of the
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92 // driver only needs to know the number of elapsed seconds between
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93 // the init_hw_seconds and get_hw_seconds calls; the hardware
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94 // epoch base is factored out, so the driver can use any base
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95 // desired (see the emulated device).
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96
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97 // Called to initialize the hardware clock to a known sane state, or
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98 // simply to make sure it can be accessed in set-get mode.
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99 void init_hw_seconds( void );
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100
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101 // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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102 // (or any desired epoch when in init-get mode)
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103 cyg_uint32 get_hw_seconds( void );
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104
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105 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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106 // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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107 void set_hw_seconds( cyg_uint32 secs );
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108 #endif
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109 };
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110
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111 #endif // ifndef CYGONCE_DEVS_WALLCLOCK_HXX
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112 // EOF wallclock.hxx