annotate packages/kernel/current/src/common/timer.cxx @ 3403:8c8767bb9a62 default tip

devs/nand/micron_mt29: Remove defunct references (in comments) to mt29f2g08_oob_ecc.
author Ross Younger <wry@ecoscentric.com>
date Sun, 18 Jan 2015 17:59:01 +1300
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): dsm
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43 // Contributors: dsm
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44 // Date: 1998-06-11
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45 // Purpose: Clock class implementation
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46 // Description: This file implements the Timer class which is derived from
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47 // the Alarm class to support uITRON type functionality
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //==========================================================================
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52
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53 #include <pkgconf/kernel.h>
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54
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55 #include <cyg/kernel/ktypes.h> // base kernel types
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56 #include <cyg/infra/cyg_trac.h> // tracing macros
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57 #include <cyg/infra/cyg_ass.h> // assertion macros
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58
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59 #include <cyg/kernel/clock.hxx>
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60 #include <cyg/kernel/timer.hxx>
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61
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62 #include <cyg/kernel/clock.inl> // Clock inlines
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63
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64 // -------------------------------------------------------------------------
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65
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66 Cyg_Timer::Cyg_Timer()
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67 {
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68 }
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69
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70 Cyg_Timer::~Cyg_Timer()
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71 {
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72 CYG_REPORT_FUNCTION();
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73
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74 disable();
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75 counter = NULL;
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76 }
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77
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78 // -------------------------------------------------------------------------
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79
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80 void
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81 Cyg_Timer::initialize(
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82 Cyg_Counter *c,
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83 cyg_alarm_fn a,
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84 CYG_ADDRWORD d,
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85 cyg_tick_count t, // absolute time
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86 cyg_tick_count i, // 0 => one shot, else repeating
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87 cyg_uint32 action // (DISABLE | ENABLE)
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88 )
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89 {
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90 CYG_REPORT_FUNCTION();
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91
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92 counter = c;
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93 alarm = a;
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94 data = d;
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95 trigger = t;
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96 interval = i;
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97 enabled = false;
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98
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99 CYG_ASSERT(0 == (action & ~ENABLE), "unknown action");
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100
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101 if(action & ENABLE)
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102 enable();
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103 }
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104
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105 void
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106 Cyg_Timer::activate(cyg_uint32 action) // (DISABLE | ENABLE) [|RESET]
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107 {
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108 // we must also disable the alarm when resetting it so as to remove it
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109 // from its queue, so that the enable afterwards places it on the right
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110 // queue instead of assuming that, being enabled, it's already there.
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111 // (if not enabling, the behaviour is unchanged and correct)
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112 if(!(action & ENABLE) || (action & RESET) )
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113 disable(); // otherwise, the enable below does nothing...
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114
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115 if((action & RESET))
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116 {
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117 cyg_tick_count t;
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118 t = counter->current_value();
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119 trigger = t + interval;
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120 }
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121
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122 if((action & ENABLE)) {
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123 enable(); // ...when it should put the timer on a new queue.
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124 }
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125 }
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126
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127 // -------------------------------------------------------------------------
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128 // EOF common/timer.cxx