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Fri, 29 Jun 2007 19:48:22 +0200
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<title>CanFestival: drivers/can_lincan/can_lincan.c Source File</title>
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<a class="el" href="dir_d58fb241e647de6212c31ecccf9cbace.html">drivers</a>&nbsp;&raquo&nbsp;<a class="el" href="dir_8cdda103ce035ff7e5ef31864566c615.html">can_lincan</a></div>
<h1>can_lincan.c</h1><a href="can__lincan_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="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;errno.h&gt;</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include &lt;fcntl.h&gt;</span>
<a name="l00027"></a>00027 
<a name="l00028"></a>00028 <span class="preprocessor">#include "<a class="code" href="canmsg_8h.html">canmsg.h</a>"</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="lincan_8h.html">lincan.h</a>"</span>
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="can__driver_8h.html">can_driver.h</a>"</span>
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 <span class="comment">/*********functions which permit to communicate with the board****************/</span>
<a name="l00034"></a><a class="code" href="can__lincan_8c.html#6b3248e95acf2b08d1fd8b42610cc5a6">00034</a> <a class="code" href="hcs12_2applicfg_8h.html#539234687760592d01a8b0d3357bc00e">UNS8</a> <a class="code" href="can__lincan_8c.html#6b3248e95acf2b08d1fd8b42610cc5a6">canReceive_driver</a>(<a class="code" href="unix_2applicfg_8h.html#712c7b28987b12b8d400df19c92d0f5e">CAN_HANDLE</a> fd0, <a class="code" href="structMessage.html">Message</a> *m)
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036   <span class="keywordtype">int</span> res;
<a name="l00037"></a>00037   <span class="keyword">struct </span><a class="code" href="structcanmsg__t.html">canmsg_t</a> canmsg;
<a name="l00038"></a>00038 
<a name="l00039"></a>00039   canmsg.<a class="code" href="structcanmsg__t.html#beea8084650640976b9c94257623b735">flags</a> = 0; <span class="comment">/* Ensure standard receive, not required for LinCAN&gt;=0.3.1 */</span>
<a name="l00040"></a>00040 
<a name="l00041"></a>00041   <span class="keywordflow">do</span>{
<a name="l00042"></a>00042     res = read(fd0,&amp;canmsg,<span class="keyword">sizeof</span>(<a class="code" href="structcanmsg__t.html">canmsg_t</a>));
<a name="l00043"></a>00043     <span class="keywordflow">if</span>((res&lt;0)&amp;&amp;(errno == -EAGAIN)) res = 0;
<a name="l00044"></a>00044   }<span class="keywordflow">while</span>(res==0);
<a name="l00045"></a>00045 
<a name="l00046"></a>00046   <span class="keywordflow">if</span>(res != <span class="keyword">sizeof</span>(<a class="code" href="structcanmsg__t.html">canmsg_t</a>)) <span class="comment">// No new message</span>
<a name="l00047"></a>00047     <span class="keywordflow">return</span> 1;
<a name="l00048"></a>00048 
<a name="l00049"></a>00049   <span class="keywordflow">if</span>(canmsg.<a class="code" href="structcanmsg__t.html#beea8084650640976b9c94257623b735">flags</a>&amp;<a class="code" href="canmsg_8h.html#973182db693bc55d98fafe82ad62f68c">MSG_EXT</a>){
<a name="l00050"></a>00050     <span class="comment">/* There is no mark for extended messages in CanFestival */</span>;
<a name="l00051"></a>00051   }
<a name="l00052"></a>00052 
<a name="l00053"></a>00053   m-&gt;<a class="code" href="structMessage.html#c5d40bde75d015beb48293c052a218b5">cob_id</a>.<a class="code" href="structSHORT__CAN.html#614e1c6a40f1261e2b15ad69b19e9698">w</a> = canmsg.<a class="code" href="structcanmsg__t.html#9ca617a401250c914820ae4ed2768725">id</a>;
<a name="l00054"></a>00054   m-&gt;<a class="code" href="structMessage.html#d1dd9a88dda088ff4c7073d49613613d">len</a> = canmsg.<a class="code" href="structcanmsg__t.html#9b2006e54552e02778eea1da3ac52070">length</a>;
<a name="l00055"></a>00055   <span class="keywordflow">if</span>(canmsg.<a class="code" href="structcanmsg__t.html#beea8084650640976b9c94257623b735">flags</a>&amp;<a class="code" href="canmsg_8h.html#a17d9d21b15825ab928d225e6b317d26">MSG_RTR</a>){
<a name="l00056"></a>00056     m-&gt;<a class="code" href="structMessage.html#41c5a4e7eaeb2c2ae1af2b2c83129615">rtr</a> = 1;
<a name="l00057"></a>00057   }<span class="keywordflow">else</span>{
<a name="l00058"></a>00058     m-&gt;<a class="code" href="structMessage.html#41c5a4e7eaeb2c2ae1af2b2c83129615">rtr</a> = 0;
<a name="l00059"></a>00059     memcpy(m-&gt;<a class="code" href="structMessage.html#229865b09691e658677ba76f2d82ce89">data</a>,canmsg.<a class="code" href="structcanmsg__t.html#778d41b22a1ae1f0da4631885239a10c">data</a>,8);
<a name="l00060"></a>00060   }
<a name="l00061"></a>00061 
<a name="l00062"></a>00062   <span class="keywordflow">return</span> 0;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 
<a name="l00065"></a>00065 <span class="comment">/***************************************************************************/</span>
<a name="l00066"></a><a class="code" href="can__lincan_8c.html#def95aee49efa13dd047d0b3b5507ad3">00066</a> <a class="code" href="hcs12_2applicfg_8h.html#539234687760592d01a8b0d3357bc00e">UNS8</a> <a class="code" href="can__lincan_8c.html#def95aee49efa13dd047d0b3b5507ad3">canSend_driver</a>(<a class="code" href="unix_2applicfg_8h.html#712c7b28987b12b8d400df19c92d0f5e">CAN_HANDLE</a> fd0, <a class="code" href="structMessage.html">Message</a> *m)
<a name="l00067"></a>00067 {
<a name="l00068"></a>00068   <span class="keywordtype">int</span> res;
<a name="l00069"></a>00069   <span class="keyword">struct </span><a class="code" href="structcanmsg__t.html">canmsg_t</a> canmsg;
<a name="l00070"></a>00070 
<a name="l00071"></a>00071 
<a name="l00072"></a>00072   canmsg.<a class="code" href="structcanmsg__t.html#beea8084650640976b9c94257623b735">flags</a> = 0;
<a name="l00073"></a>00073   canmsg.<a class="code" href="structcanmsg__t.html#9ca617a401250c914820ae4ed2768725">id</a> = m-&gt;<a class="code" href="structMessage.html#c5d40bde75d015beb48293c052a218b5">cob_id</a>.<a class="code" href="structSHORT__CAN.html#614e1c6a40f1261e2b15ad69b19e9698">w</a>;
<a name="l00074"></a>00074   canmsg.<a class="code" href="structcanmsg__t.html#9b2006e54552e02778eea1da3ac52070">length</a> = m-&gt;<a class="code" href="structMessage.html#d1dd9a88dda088ff4c7073d49613613d">len</a>;
<a name="l00075"></a>00075   <span class="keywordflow">if</span>(m-&gt;<a class="code" href="structMessage.html#41c5a4e7eaeb2c2ae1af2b2c83129615">rtr</a>){
<a name="l00076"></a>00076     canmsg.<a class="code" href="structcanmsg__t.html#beea8084650640976b9c94257623b735">flags</a> |= <a class="code" href="canmsg_8h.html#a17d9d21b15825ab928d225e6b317d26">MSG_RTR</a>;
<a name="l00077"></a>00077   }<span class="keywordflow">else</span>{
<a name="l00078"></a>00078     memcpy(canmsg.<a class="code" href="structcanmsg__t.html#778d41b22a1ae1f0da4631885239a10c">data</a>,m-&gt;<a class="code" href="structMessage.html#229865b09691e658677ba76f2d82ce89">data</a>,8);
<a name="l00079"></a>00079   }
<a name="l00080"></a>00080 
<a name="l00081"></a>00081   <span class="keywordflow">if</span>(canmsg.<a class="code" href="structcanmsg__t.html#9ca617a401250c914820ae4ed2768725">id</a> &gt;= 0x800){
<a name="l00082"></a>00082     canmsg.<a class="code" href="structcanmsg__t.html#beea8084650640976b9c94257623b735">flags</a> |= <a class="code" href="canmsg_8h.html#973182db693bc55d98fafe82ad62f68c">MSG_EXT</a>;
<a name="l00083"></a>00083   }
<a name="l00084"></a>00084 
<a name="l00085"></a>00085   res = write(fd0,&amp;canmsg,<span class="keyword">sizeof</span>(<a class="code" href="structcanmsg__t.html">canmsg_t</a>));
<a name="l00086"></a>00086   <span class="keywordflow">if</span>(res!=<span class="keyword">sizeof</span>(canmsg_t))
<a name="l00087"></a>00087     <span class="keywordflow">return</span> 1;
<a name="l00088"></a>00088 
<a name="l00089"></a>00089   <span class="keywordflow">return</span> 0;
<a name="l00090"></a>00090 }
<a name="l00091"></a>00091 
<a name="l00092"></a>00092 <span class="comment">/***************************************************************************/</span>
<a name="l00093"></a>00093 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> lnx_can_dev_prefix[] = <span class="stringliteral">"/dev/can"</span>;
<a name="l00094"></a>00094 
<a name="l00095"></a><a class="code" href="can__lincan_8c.html#945403aba7f36acbd2e7160ade361bab">00095</a> <a class="code" href="unix_2applicfg_8h.html#712c7b28987b12b8d400df19c92d0f5e">CAN_HANDLE</a> <a class="code" href="can__lincan_8c.html#945403aba7f36acbd2e7160ade361bab">canOpen_driver</a>(<a class="code" href="structstruct__s__BOARD.html">s_BOARD</a> *board)
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097   <span class="keywordtype">int</span> name_len = strlen(board-&gt;<a class="code" href="structstruct__s__BOARD.html#fb28847fd702021b624afe1f7d4b25b2">busname</a>);
<a name="l00098"></a>00098   <span class="keywordtype">int</span> prefix_len = strlen(lnx_can_dev_prefix);
<a name="l00099"></a>00099   <span class="keywordtype">char</span> dev_name[prefix_len+name_len+1];
<a name="l00100"></a>00100   <span class="keywordtype">int</span> o_flags = 0;
<a name="l00101"></a>00101   <a class="code" href="unix_2applicfg_8h.html#712c7b28987b12b8d400df19c92d0f5e">CAN_HANDLE</a> fd0;
<a name="l00102"></a>00102 
<a name="l00103"></a>00103   fd0=malloc(<span class="keyword">sizeof</span>(*fd0));
<a name="l00104"></a>00104   <span class="keywordflow">if</span>(fd0==NULL)
<a name="l00105"></a>00105     <span class="keywordflow">return</span> NULL;
<a name="l00106"></a>00106 
<a name="l00107"></a>00107   <span class="comment">/*o_flags = O_NONBLOCK;*/</span>
<a name="l00108"></a>00108 
<a name="l00109"></a>00109   memcpy(dev_name,lnx_can_dev_prefix,prefix_len);
<a name="l00110"></a>00110   memcpy(dev_name+prefix_len,board-&gt;<a class="code" href="structstruct__s__BOARD.html#fb28847fd702021b624afe1f7d4b25b2">busname</a>,name_len);
<a name="l00111"></a>00111   dev_name[prefix_len+name_len] = 0;
<a name="l00112"></a>00112 
<a name="l00113"></a>00113   fd0 = open(dev_name, O_RDWR|o_flags);
<a name="l00114"></a>00114   <span class="keywordflow">if</span>(fd0 &lt; 0){
<a name="l00115"></a>00115     fprintf(stderr,<span class="stringliteral">"!!! Board %s is unknown. See can_lincan.c\n"</span>, board-&gt;<a class="code" href="structstruct__s__BOARD.html#fb28847fd702021b624afe1f7d4b25b2">busname</a>);
<a name="l00116"></a>00116     <span class="keywordflow">goto</span> error_ret;
<a name="l00117"></a>00117   }
<a name="l00118"></a>00118 
<a name="l00119"></a>00119   <span class="keywordflow">return</span> fd0;
<a name="l00120"></a>00120 
<a name="l00121"></a>00121  error_ret:
<a name="l00122"></a>00122   free(fd0);
<a name="l00123"></a>00123   <span class="keywordflow">return</span> NULL;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 
<a name="l00126"></a>00126 <span class="comment">/***************************************************************************/</span>
<a name="l00127"></a><a class="code" href="can__lincan_8c.html#76e6a915d0e40a23b863198b2aaa5545">00127</a> <span class="keywordtype">int</span> <a class="code" href="can__lincan_8c.html#76e6a915d0e40a23b863198b2aaa5545">canClose_driver</a>(<a class="code" href="unix_2applicfg_8h.html#712c7b28987b12b8d400df19c92d0f5e">CAN_HANDLE</a> fd0)
<a name="l00128"></a>00128 {
<a name="l00129"></a>00129   <span class="keywordflow">if</span>(!fd0)
<a name="l00130"></a>00130     <span class="keywordflow">return</span> 0;
<a name="l00131"></a>00131   close(fd0);
<a name="l00132"></a>00132   <span class="keywordflow">return</span> 0;
<a name="l00133"></a>00133 }
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