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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 //==========================================================================
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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 //####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): dsm
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44 // Contributors: dsm
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45 // Date: 1998-06-11
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46 // Purpose: Clock class implementation
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47 // Description: This file implements the Timer class which is derived from
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48 // the Alarm class to support uITRON type functionality
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <pkgconf/kernel.h>
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55
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56 #include <cyg/kernel/ktypes.h> // base kernel types
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57 #include <cyg/infra/cyg_trac.h> // tracing macros
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58 #include <cyg/infra/cyg_ass.h> // assertion macros
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59
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60 #include <cyg/kernel/clock.hxx>
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61 #include <cyg/kernel/timer.hxx>
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62
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63 #include <cyg/kernel/clock.inl> // Clock inlines
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64
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65 // -------------------------------------------------------------------------
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66
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67 Cyg_Timer::Cyg_Timer()
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68 {
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69 }
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70
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71 Cyg_Timer::~Cyg_Timer()
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72 {
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73 CYG_REPORT_FUNCTION();
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74
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75 disable();
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76 counter = NULL;
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77 }
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78
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79 // -------------------------------------------------------------------------
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80
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81 void
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82 Cyg_Timer::initialize(
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83 Cyg_Counter *c,
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84 cyg_alarm_fn a,
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85 CYG_ADDRWORD d,
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86 cyg_tick_count t, // absolute time
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87 cyg_tick_count i, // 0 => one shot, else repeating
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88 cyg_uint32 action // (DISABLE | ENABLE)
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89 )
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90 {
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91 CYG_REPORT_FUNCTION();
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92
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93 counter = c;
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94 alarm = a;
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95 data = d;
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96 trigger = t;
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97 interval = i;
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98 enabled = false;
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99
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100 CYG_ASSERT(0 == (action & ~ENABLE), "unknown action");
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101
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102 if(action & ENABLE)
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103 enable();
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104 }
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105
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106 void
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107 Cyg_Timer::activate(cyg_uint32 action) // (DISABLE | ENABLE) [|RESET]
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108 {
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109 // we must also disable the alarm when resetting it so as to remove it
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110 // from its queue, so that the enable afterwards places it on the right
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111 // queue instead of assuming that, being enabled, it's already there.
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112 // (if not enabling, the behaviour is unchanged and correct)
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113 if(!(action & ENABLE) || (action & RESET) )
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114 disable(); // otherwise, the enable below does nothing...
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115
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116 if((action & RESET))
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117 {
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118 cyg_tick_count t;
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119 t = counter->current_value();
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120 trigger = t + interval;
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121 }
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122
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123 if((action & ENABLE)) {
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124 enable(); // ...when it should put the timer on a new queue.
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125 }
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126 }
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127
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128 // -------------------------------------------------------------------------
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129 // EOF common/timer.cxx