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author lbessard
Tue, 05 Jun 2007 17:34:33 +0200
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<h1>/home/epimerde/documents/tc11/CanFestival-3/src/timer.c</h1><a href="timer_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">This file is part of CanFestival, a library implementing CanOpen Stack. </span>
<a name="l00003"></a>00003 <span class="comment"></span>
<a name="l00004"></a>00004 <span class="comment">Copyright (C): Edouard TISSERANT and Francis DUPIN</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment">See COPYING file for copyrights details.</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment">This library is free software; you can redistribute it and/or</span>
<a name="l00009"></a>00009 <span class="comment">modify it under the terms of the GNU Lesser General Public</span>
<a name="l00010"></a>00010 <span class="comment">License as published by the Free Software Foundation; either</span>
<a name="l00011"></a>00011 <span class="comment">version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00012"></a>00012 <span class="comment"></span>
<a name="l00013"></a>00013 <span class="comment">This library is distributed in the hope that it will be useful,</span>
<a name="l00014"></a>00014 <span class="comment">but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00015"></a>00015 <span class="comment">MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</span>
<a name="l00016"></a>00016 <span class="comment">Lesser General Public License for more details.</span>
<a name="l00017"></a>00017 <span class="comment"></span>
<a name="l00018"></a>00018 <span class="comment">You should have received a copy of the GNU Lesser General Public</span>
<a name="l00019"></a>00019 <span class="comment">License along with this library; if not, write to the Free Software</span>
<a name="l00020"></a>00020 <span class="comment">Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA</span>
<a name="l00021"></a>00021 <span class="comment">*/</span>
<a name="l00022"></a>00022 
<a name="l00023"></a>00023 <span class="comment">/* #define DEBUG_WAR_CONSOLE_ON */</span>
<a name="l00024"></a>00024 <span class="comment">/* #define DEBUG_ERR_CONSOLE_ON */</span>
<a name="l00025"></a>00025 
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;applicfg.h&gt;</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "timer.h"</span>
<a name="l00028"></a>00028 
<a name="l00029"></a>00029 <span class="comment">/*  ---------  The timer table --------- */</span>
<a name="l00030"></a><a class="code" href="timer_8c.html#a74e2cf2504bfd18b12f112c7aaad845">00030</a> s_timer_entry <a class="code" href="timer_8c.html#a74e2cf2504bfd18b12f112c7aaad845">timers</a>[MAX_NB_TIMER] = {{TIMER_FREE, NULL, NULL, 0, 0, 0},};
<a name="l00031"></a>00031 
<a name="l00032"></a><a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">00032</a> TIMEVAL <a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">total_sleep_time</a> = TIMEVAL_MAX;
<a name="l00033"></a><a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">00033</a> TIMER_HANDLE <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a> = -1;
<a name="l00034"></a>00034 
<a name="l00035"></a><a class="code" href="timer_8c.html#8536312cebeeea3a23dc0027800122c9">00035</a> <span class="preprocessor">#define min_val(a,b) ((a&lt;b)?a:b)</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span>
<a name="l00037"></a>00037 <span class="comment">/* ---------  Use this to declare a new alarm --------- */</span>
<a name="l00038"></a><a class="code" href="timer_8c.html#11c2616d78f06ed9144ef662f757b128">00038</a> TIMER_HANDLE <a class="code" href="timer_8c.html#11c2616d78f06ed9144ef662f757b128">SetAlarm</a>(CO_Data* d, UNS32 <span class="keywordtype">id</span>, TimerCallback_t callback, TIMEVAL value, TIMEVAL period)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040         <span class="comment">/*printf("SetAlarm(UNS32 id=%d, TimerCallback_t callback=%x, TIMEVAL value=%d, TIMEVAL period=%d)\n", id, callback, value, period); */</span>
<a name="l00041"></a>00041         TIMER_HANDLE i;
<a name="l00042"></a>00042         TIMER_HANDLE row_number = TIMER_NONE;
<a name="l00043"></a>00043 
<a name="l00044"></a>00044         <span class="comment">/* in order to decide new timer setting we have to run over all timer rows */</span>
<a name="l00045"></a>00045         <span class="keywordflow">for</span>(i=0; i &lt;= <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a> + 1 &amp;&amp; i &lt; MAX_NB_TIMER; i++)
<a name="l00046"></a>00046         {
<a name="l00047"></a>00047                 s_timer_entry *row = (<a class="code" href="timer_8c.html#a74e2cf2504bfd18b12f112c7aaad845">timers</a>+i);
<a name="l00048"></a>00048 
<a name="l00049"></a>00049                 <span class="keywordflow">if</span> (callback &amp;&amp;         <span class="comment">/* if something to store */</span>
<a name="l00050"></a>00050                    row-&gt;state == TIMER_FREE) <span class="comment">/* and empty row */</span>
<a name="l00051"></a>00051                 {       <span class="comment">/* just store */</span>
<a name="l00052"></a>00052                         row-&gt;callback = callback;
<a name="l00053"></a>00053                         row-&gt;d = d;
<a name="l00054"></a>00054                         row-&gt;id = <span class="keywordtype">id</span>;
<a name="l00055"></a>00055                         row-&gt;val = value;
<a name="l00056"></a>00056                         row-&gt;interval = period;
<a name="l00057"></a>00057                         row-&gt;state = TIMER_ARMED;
<a name="l00058"></a>00058                         row_number = i;
<a name="l00059"></a>00059                         <span class="keywordflow">break</span>;
<a name="l00060"></a>00060                 }
<a name="l00061"></a>00061         }
<a name="l00062"></a>00062         
<a name="l00063"></a>00063         <span class="keywordflow">if</span> (row_number != TIMER_NONE) <span class="comment">/* if successfull **/</span>
<a name="l00064"></a>00064         {
<a name="l00065"></a>00065                 TIMEVAL real_timer_value;
<a name="l00066"></a>00066                 TIMEVAL elapsed_time;
<a name="l00067"></a>00067                 
<a name="l00068"></a>00068                 <span class="keywordflow">if</span> (row_number == <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a> + 1) <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a>++;
<a name="l00069"></a>00069                 
<a name="l00070"></a>00070                 <span class="comment">/* set next wakeup alarm if new entry is sooner than others, or if it is alone */</span>
<a name="l00071"></a>00071                 real_timer_value = <a class="code" href="timer_8c.html#8536312cebeeea3a23dc0027800122c9">min_val</a>(value, TIMEVAL_MAX);
<a name="l00072"></a>00072                 elapsed_time = getElapsedTime();
<a name="l00073"></a>00073 
<a name="l00074"></a>00074                 <span class="comment">/*printf("elapsed_time=%d real_timer_value=%d total_sleep_time=%d\n", elapsed_time, real_timer_value, total_sleep_time); */</span>
<a name="l00075"></a>00075                 <span class="keywordflow">if</span> (<a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">total_sleep_time</a> &gt; elapsed_time &amp;&amp; <a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">total_sleep_time</a> - elapsed_time &gt; real_timer_value)
<a name="l00076"></a>00076                 {
<a name="l00077"></a>00077                         <a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">total_sleep_time</a> = elapsed_time + real_timer_value;
<a name="l00078"></a>00078                         setTimer(real_timer_value);
<a name="l00079"></a>00079                 }
<a name="l00080"></a>00080                 <span class="comment">/*printf("SetAlarm() return %d\n", row_number); */</span>
<a name="l00081"></a>00081                 <span class="keywordflow">return</span> row_number;
<a name="l00082"></a>00082         }
<a name="l00083"></a>00083         <span class="keywordflow">return</span> TIMER_NONE;
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085 
<a name="l00086"></a>00086 <span class="comment">/* ---------  Use this to remove an alarm --------- */</span>
<a name="l00087"></a><a class="code" href="timer_8c.html#991b3cfaac2f201b14d5530f75985c21">00087</a> TIMER_HANDLE <a class="code" href="timer_8c.html#991b3cfaac2f201b14d5530f75985c21">DelAlarm</a>(TIMER_HANDLE handle)
<a name="l00088"></a>00088 {
<a name="l00089"></a>00089         <span class="comment">/* Quick and dirty. system timer will continue to be trigged, but no action will be preformed. */</span>
<a name="l00090"></a>00090         MSG_WAR(0x3320, <span class="stringliteral">"DelAlarm. handle = "</span>, handle);
<a name="l00091"></a>00091         <span class="keywordflow">if</span>(handle != TIMER_NONE)
<a name="l00092"></a>00092         {
<a name="l00093"></a>00093                 <span class="keywordflow">if</span>(handle == <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a>) 
<a name="l00094"></a>00094                         <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a>--;
<a name="l00095"></a>00095                 <a class="code" href="timer_8c.html#a74e2cf2504bfd18b12f112c7aaad845">timers</a>[handle].state = TIMER_FREE;              
<a name="l00096"></a>00096         }
<a name="l00097"></a>00097         <span class="keywordflow">else</span> {
<a name="l00098"></a>00098         }
<a name="l00099"></a>00099         <span class="keywordflow">return</span> TIMER_NONE;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101 
<a name="l00102"></a>00102 
<a name="l00103"></a>00103 <span class="comment">/* ---------  TimeDispatch is called on each timer expiration --------- */</span>
<a name="l00104"></a><a class="code" href="timer_8c.html#fa75192a3238525618f8cb83004930cc">00104</a> <span class="keywordtype">void</span> <a class="code" href="timer_8c.html#fa75192a3238525618f8cb83004930cc">TimeDispatch</a>()
<a name="l00105"></a>00105 {
<a name="l00106"></a>00106         TIMER_HANDLE i;
<a name="l00107"></a>00107         TIMEVAL next_wakeup = TIMEVAL_MAX; <span class="comment">/* used to compute when should normaly occur next wakeup */</span>
<a name="l00108"></a>00108         <span class="comment">/* First run : change timer state depending on time */</span>
<a name="l00109"></a>00109         <span class="comment">/* Get time since timer signal */</span>
<a name="l00110"></a>00110         TIMEVAL overrun = getElapsedTime();
<a name="l00111"></a>00111         
<a name="l00112"></a>00112         TIMEVAL real_total_sleep_time = <a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">total_sleep_time</a> + overrun;
<a name="l00113"></a>00113         <span class="comment">/*printf("total_sleep_time %d + overrun %d\n", total_sleep_time , overrun); */</span>
<a name="l00114"></a>00114 
<a name="l00115"></a>00115         <span class="keywordflow">for</span>(i=0; i &lt;= <a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a>; i++)
<a name="l00116"></a>00116         {
<a name="l00117"></a>00117                 s_timer_entry *row = (<a class="code" href="timer_8c.html#a74e2cf2504bfd18b12f112c7aaad845">timers</a>+i);
<a name="l00118"></a>00118 
<a name="l00119"></a>00119                 <span class="keywordflow">if</span> (row-&gt;state &amp; TIMER_ARMED) <span class="comment">/* if row is active */</span>
<a name="l00120"></a>00120                 {
<a name="l00121"></a>00121                         if (row-&gt;val &lt;= real_total_sleep_time) <span class="comment">/* to be trigged */</span>
<a name="l00122"></a>00122                         {
<a name="l00123"></a>00123                                 <span class="comment">/*printf("row-&gt;val(%d) &lt;= (%d)real_total_sleep_time\n", row-&gt;val, real_total_sleep_time); */</span>
<a name="l00124"></a>00124                                 if (!row-&gt;interval) <span class="comment">/* if simply outdated */</span>
<a name="l00125"></a>00125                                 {
<a name="l00126"></a>00126                                         row-&gt;state = TIMER_TRIG; <span class="comment">/* ask for trig */</span>
<a name="l00127"></a>00127                                 }
<a name="l00128"></a>00128                                 <span class="keywordflow">else</span> <span class="comment">/* or period have expired */</span>
<a name="l00129"></a>00129                                 {
<a name="l00130"></a>00130                                         <span class="comment">/* set val as interval, with overrun correction */</span>
<a name="l00131"></a>00131                                         row-&gt;val = row-&gt;interval - (overrun % row-&gt;interval);
<a name="l00132"></a>00132                                         row-&gt;state = TIMER_TRIG_PERIOD; <span class="comment">/* ask for trig, periodic */</span>
<a name="l00133"></a>00133                                         <span class="comment">/* Check if this new timer value is the soonest */</span>
<a name="l00134"></a>00134                                         next_wakeup = <a class="code" href="timer_8c.html#8536312cebeeea3a23dc0027800122c9">min_val</a>(row-&gt;val,next_wakeup);
<a name="l00135"></a>00135                                 }
<a name="l00136"></a>00136                         }
<a name="l00137"></a>00137                         <span class="keywordflow">else</span>
<a name="l00138"></a>00138                         {
<a name="l00139"></a>00139                                 <span class="comment">/* Each armed timer value in decremented. */</span>
<a name="l00140"></a>00140                                 row-&gt;val -= real_total_sleep_time;
<a name="l00141"></a>00141 
<a name="l00142"></a>00142                                 <span class="comment">/* Check if this new timer value is the soonest */</span>
<a name="l00143"></a>00143                                 next_wakeup = <a class="code" href="timer_8c.html#8536312cebeeea3a23dc0027800122c9">min_val</a>(row-&gt;val,next_wakeup);
<a name="l00144"></a>00144                         }
<a name="l00145"></a>00145                 }
<a name="l00146"></a>00146         }
<a name="l00147"></a>00147         
<a name="l00148"></a>00148         <span class="comment">/* Remember how much time we should sleep. */</span>
<a name="l00149"></a>00149         <a class="code" href="timer_8c.html#5e9651eed13d70bcce9bdf3489a72a3d">total_sleep_time</a> = next_wakeup;
<a name="l00150"></a>00150 
<a name="l00151"></a>00151         <span class="comment">/* Set timer to soonest occurence */</span>
<a name="l00152"></a>00152         setTimer(next_wakeup);
<a name="l00153"></a>00153 
<a name="l00154"></a>00154         <span class="comment">/* Then trig them or not. */</span>
<a name="l00155"></a>00155         <span class="keywordflow">for</span>(i=0; i&lt;=<a class="code" href="timer_8c.html#1dab7b9a29bdee8b1931f8ea90685c6f">last_timer_raw</a>; i++)
<a name="l00156"></a>00156         {
<a name="l00157"></a>00157                 s_timer_entry *row = (<a class="code" href="timer_8c.html#a74e2cf2504bfd18b12f112c7aaad845">timers</a>+i);
<a name="l00158"></a>00158 
<a name="l00159"></a>00159                 <span class="keywordflow">if</span> (row-&gt;state &amp; TIMER_TRIG)
<a name="l00160"></a>00160                 {
<a name="l00161"></a>00161                         row-&gt;state &amp;= ~TIMER_TRIG; <span class="comment">/* reset trig state (will be free if not periodic) */</span>
<a name="l00162"></a>00162                         <span class="keywordflow">if</span>(row-&gt;callback)
<a name="l00163"></a>00163                                 (*row-&gt;callback)(row-&gt;d, row-&gt;id); <span class="comment">/* trig ! */</span>
<a name="l00164"></a>00164                 }
<a name="l00165"></a>00165         }
<a name="l00166"></a>00166 }
<a name="l00167"></a>00167 
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