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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#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus 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 "AS IS" |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): dsm |
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33 // Contributors: dsm |
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34 // Date: 1998-06-11 |
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35 // Purpose: Clock class implementation |
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36 // Description: This file implements the Timer class which is derived from |
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37 // the Alarm class to support uITRON type functionality |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //========================================================================== |
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42 |
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43 #include <pkgconf/kernel.h> |
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44 |
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45 #include <cyg/kernel/ktypes.h> // base kernel types |
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46 #include <cyg/infra/cyg_trac.h> // tracing macros |
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47 #include <cyg/infra/cyg_ass.h> // assertion macros |
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48 |
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49 #include <cyg/kernel/clock.hxx> |
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50 #include <cyg/kernel/timer.hxx> |
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51 |
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52 #include <cyg/kernel/clock.inl> // Clock inlines |
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53 |
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54 // ------------------------------------------------------------------------- |
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55 |
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56 Cyg_Timer::Cyg_Timer() |
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57 { |
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58 } |
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59 |
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60 Cyg_Timer::~Cyg_Timer() |
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61 { |
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62 CYG_REPORT_FUNCTION(); |
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63 |
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64 disable(); |
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65 counter = NULL; |
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66 } |
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67 |
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68 // ------------------------------------------------------------------------- |
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69 |
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70 void |
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71 Cyg_Timer::initialize( |
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72 Cyg_Counter *c, |
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73 cyg_alarm_fn a, |
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74 CYG_ADDRWORD d, |
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75 cyg_tick_count t, // absolute time |
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76 cyg_tick_count i, // 0 => one shot, else repeating |
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77 cyg_uint32 action // (DISABLE | ENABLE) |
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78 ) |
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79 { |
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80 CYG_REPORT_FUNCTION(); |
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81 |
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82 counter = c; |
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83 alarm = a; |
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84 data = d; |
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85 trigger = t; |
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86 interval = i; |
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87 enabled = false; |
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88 |
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89 CYG_ASSERT(0 == (action & ~ENABLE), "unknown action"); |
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90 |
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91 if(action & ENABLE) |
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92 enable(); |
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93 } |
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94 |
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95 void |
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96 Cyg_Timer::activate(cyg_uint32 action) // (DISABLE | ENABLE) [|RESET] |
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97 { |
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98 // we must also disable the alarm when resetting it so as to remove it |
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99 // from its queue, so that the enable afterwards places it on the right |
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100 // queue instead of assuming that, being enabled, it's already there. |
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101 // (if not enabling, the behaviour is unchanged and correct) |
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102 if(!(action & ENABLE) || (action & RESET) ) |
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103 disable(); // otherwise, the enable below does nothing... |
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104 |
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105 if((action & RESET)) |
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106 { |
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107 cyg_tick_count t; |
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108 t = counter->current_value(); |
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109 trigger = t + interval; |
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110 } |
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111 |
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112 if((action & ENABLE)) { |
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113 enable(); // ...when it should put the timer on a new queue. |
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114 } |
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115 } |
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116 |
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117 // ------------------------------------------------------------------------- |
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118 // EOF common/timer.cxx |
