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annotate packages/io/wallclock/current/src/wallclock.cxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 289bf90c6a9b
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // devs/wallclock/wallclock.cxx
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4 //
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5 // Wallclock base
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jskov
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44 // Contributors: jskov
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45 // Date: 2000-03-28
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46 // Purpose: Wallclock base driver
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47 // Description: This provides a generic wallclock base driver which
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48 // relies on sub-drivers to provide the interface functions
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49 // to the hardware device (see wallclock.hxx for details).
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50 //
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51 // The driver can be configured to run in one of two modes:
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52 // init-get mode:
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53 // In this mode, the hardware driver only needs to
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54 // implement a function to read the hardware clock
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55 // and a (possibly empty) init function which makes
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56 // sure the hardware clock is properly initialized.
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57 // While the driver in this mode has a smaller memory
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58 // foot-print, it does not support battery-backed up
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59 // clocks.
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60 //
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61 // set-get mode:
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62 // Requires both set and get functions for the hardware
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63 // device. While bigger, it allows support of
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64 // battery-backed up clocks.
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65 //
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66 //
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67 //####DESCRIPTIONEND####
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68 //
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69 //==========================================================================
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70
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71 #include <pkgconf/wallclock.h> // Wallclock device config
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72
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73 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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75 #include <cyg/hal/drv_api.h> // Driver API
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77 #include <cyg/io/wallclock.hxx> // The WallClock API
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78
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80 //-----------------------------------------------------------------------------
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81 // Local static variables
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83 static Cyg_WallClock wallclock_instance CYGBLD_ATTRIB_INIT_AFTER( CYG_INIT_CLOCK );
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84
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85 #ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
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86 static cyg_uint32 epoch_ticks;
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87 static cyg_uint32 epoch_time_stamp;
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88 #endif
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89
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90 Cyg_WallClock *Cyg_WallClock::wallclock;
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91
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92 //-----------------------------------------------------------------------------
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93 // Constructor
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94
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95 Cyg_WallClock::Cyg_WallClock()
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96 {
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97 // install instance pointer
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98 wallclock = &wallclock_instance;
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99
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100 // Always allow low-level driver to initialize clock, even though it
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101 // may not be necessary for set-get mode.
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102 init_hw_seconds();
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103 }
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104
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105 //-----------------------------------------------------------------------------
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106 // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
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107 // This may involve reading the hardware, so it may take anything up to
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108 // a second to complete.
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109
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110 cyg_uint32 Cyg_WallClock::get_current_time()
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111 {
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112 cyg_uint32 res;
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113
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114 cyg_drv_dsr_lock();
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115
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116 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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117 res = get_hw_seconds();
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118 #else
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119 res = epoch_time_stamp + get_hw_seconds() - epoch_ticks;
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120 #endif
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121
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122 cyg_drv_dsr_unlock();
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123
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124 return res;
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125 }
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126
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127 //-----------------------------------------------------------------------------
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128 // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
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129 // This may involve reading or writing to the hardware, so it may take
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130 // anything up to a second to complete.
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131 void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
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132 {
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133 cyg_drv_dsr_lock();
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134
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135 #ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
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136 set_hw_seconds(time_stamp);
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137 #else
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138 epoch_time_stamp = time_stamp;
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139 epoch_ticks = get_hw_seconds();
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140 #endif
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141
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142 cyg_drv_dsr_unlock();
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143 }
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144
2085233a121a Merge from eCos master repository on 2000-04-07-07:52:29-BST
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145 //-----------------------------------------------------------------------------
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146 // End of devs/wallclock/wallclock.cxx