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annotate packages/kernel/current/src/common/timer.cxx @ 64:c38311975d4f ecos-sw-2000-01-28

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Merge from eCos master repository on 2000-01-28-04:28:11-GMT
author jlarmour
date Fri, 28 Jan 2000 04:59:39 +0000
parents 443894e2e912
children bf00f99aec69
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1 //==========================================================================
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2 //
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3 // common/timer.cxx
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4 //
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5 // Timer class implementations
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
64
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.0 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://sourceware.cygnus.com/ecos
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15 //
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16 // Software distributed under the License is distributed on an
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): dsm
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35 // Contributors: dsm
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36 // Date: 1998-06-11
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37 // Purpose: Clock class implementation
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38 // Description: This file implements the Timer class which is derived from
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39 // the Alarm class to support uITRON type functionality
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
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45 #include <pkgconf/kernel.h>
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46
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47 #include <cyg/kernel/ktypes.h> // base kernel types
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48 #include <cyg/infra/cyg_trac.h> // tracing macros
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49 #include <cyg/infra/cyg_ass.h> // assertion macros
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50
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51 #include <cyg/kernel/clock.hxx>
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52 #include <cyg/kernel/timer.hxx>
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53
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54 #include <cyg/kernel/clock.inl> // Clock inlines
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55
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56 // -------------------------------------------------------------------------
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57
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58 Cyg_Timer::Cyg_Timer()
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59 {
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60 }
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61
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62 Cyg_Timer::~Cyg_Timer()
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63 {
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64 CYG_REPORT_FUNCTION();
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65
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66 disable();
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67 counter = NULL;
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68 }
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69
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70 // -------------------------------------------------------------------------
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71
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72 void
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73 Cyg_Timer::initialize(
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74 Cyg_Counter *c,
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75 cyg_alarm_fn a,
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76 CYG_ADDRWORD d,
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77 cyg_tick_count t, // absolute time
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78 cyg_tick_count i, // 0 => one shot, else repeating
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79 cyg_uint32 action // (DISABLE | ENABLE)
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80 )
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81 {
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82 CYG_REPORT_FUNCTION();
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83
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84 counter = c;
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85 alarm = a;
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86 data = d;
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87 trigger = t;
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88 interval = i;
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89 enabled = false;
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90
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91 CYG_ASSERT(0 == (action & ~ENABLE), "unknown action");
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92
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93 if(action & ENABLE)
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94 enable();
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95 }
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96
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97 void
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98 Cyg_Timer::activate(cyg_uint32 action) // (DISABLE | ENABLE) [|RESET]
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99 {
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100 // we must also disable the alarm when resetting it so as to remove it
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101 // from its queue, so that the enable afterwards places it on the right
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102 // queue instead of assuming that, being enabled, it's already there.
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103 // (if not enabling, the behaviour is unchanged and correct)
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104 if(!(action & ENABLE) || (action & RESET) )
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105 disable(); // otherwise, the enable below does nothing...
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106
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107 if((action & RESET))
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108 {
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109 cyg_tick_count t;
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110 t = counter->current_value();
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111 trigger = t + interval;
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112 }
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113
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114 if((action & ENABLE)) {
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115 enable(); // ...when it should put the timer on a new queue.
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116 }
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117 }
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118
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119 // -------------------------------------------------------------------------
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120 // EOF common/timer.cxx