udp__demo_8c-source.html

Freescale mcu OpenTCP-1.0.4.doc.html.zip 文档

00127         <span class="comment">/* open socket for receiving/sending of the data on defined port*/</span>
00128         <a class="code" href="udp_8c.html#a5">udp_open</a>(<a class="code" href="udp__demo_8c.html#a4">udp_demo_soch</a>,<a class="code" href="udp__demo_8c.html#a0">UDP_DEMO_PORT</a>);
00129         
00130         <span class="comment">/* for now no data sending */</span>
00131         <a class="code" href="udp__demo_8c.html#a5">udp_demo_senddata</a>=0;
00132 }
00133 
00134 <span class="comment">/* UDP Demo app main loop that is periodically invoked from the</span>
00135 <span class="comment"> * main loop (see main_demo.c)</span>
00136 <span class="comment"> */</span>
00137 <span class="keywordtype">void</span> udp_demo_run(<span class="keywordtype">void</span>){
00138         <span class="comment">/* do maybe some other UDP demo app stuff</span>
00139 <span class="comment">         * .....</span>
00140 <span class="comment">         */</span>
00141         <span class="keywordflow">if</span>(udp_demo_senddata) {
00142                 <span class="keywordflow">switch</span>(udp_demo_send()){
00143                         <span class="keywordflow">case</span> -1:
00144                                 DEBUGOUT(<span class="stringliteral">"Error (General error, e.g. parameters)\r\n"</span>);
00145                                 <span class="keywordflow">break</span>; 
00146                         <span class="keywordflow">case</span> -2:
00147                                 DEBUGOUT(<span class="stringliteral">"ARP or lower layer not ready, try again\r\n"</span>);
00148                                 <span class="keywordflow">break</span>;
00149                         <span class="keywordflow">case</span> -3:
00150                                 DEBUGOUT(<span class="stringliteral">"Socket closed or socket handle not valid!\r\n"</span>);
00151                                 <span class="keywordflow">break</span>;
00152                         <span class="keywordflow">default</span>:
00153                                 <span class="comment">/* data sent (could check how many bytes too)</span>
00154 <span class="comment">                                 * if no more data to send, reset flag</span>
00155 <span class="comment">                                 */</span>
00156                                 <a class="code" href="udp__demo_8c.html#a5">udp_demo_senddata</a>=0;
00157                                 <span class="keywordflow">break</span>;
00158                 
00159                 }
00160         }
00161 }
00162 
00163 <span class="comment">/*</span>
00164 <span class="comment"> * Event listener invoked when TCP/IP stack receives UDP datagram for</span>
00165 <span class="comment"> * a given socket. Parameters:</span>
00166 <span class="comment"> * - cbhandle - handle of the socket this packet is intended for. Check it</span>
00167 <span class="comment"> *      just to be sure, but in general case not needed</span>
00168 <span class="comment"> * - event - event that is notified. For UDP, only UDP_EVENT_DATA</span>
00169 <span class="comment"> * - ipaddr - IP address of remote host who sent the UDP datagram</span>
00170 <span class="comment"> * - port - port number of remote host who sent the UDP datagram</span>
00171 <span class="comment"> * - buffindex - buffer index in RTL8019AS allowing you to read </span>
00172 <span class="comment"> *      received data more than once from Ethernet controller by</span>
00173 <span class="comment"> *      invoking NETWORK_RECEIVE_INITIALIZE(buffindex) and then start</span>
00174 <span class="comment"> *      reading the bytes all over again</span>
00175 <span class="comment"> */</span> 
00176 INT32 udp_demo_eventlistener(INT8 cbhandle, UINT8 event, UINT32 ipaddr, UINT16 port, UINT16 buffindex, UINT16 datalen){
00177         UINT16 i;
00178         <span class="keywordflow">if</span>(cbhandle!=<a class="code" href="udp__demo_8c.html#a4">udp_demo_soch</a>){
00179                 DEBUGOUT(<span class="stringliteral">"Not my handle!!!!"</span>);
00180                 <span class="keywordflow">return</span> (-1);
00181         }
00182         
00183         <span class="keywordflow">switch</span>(event){
00184                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a31">UDP_EVENT_DATA</a>:
00185                         
00186                         <span class="comment">/* read data that was received (and </span>
00187 <span class="comment">                         * probably do something with it :-)</span>
00188 <span class="comment">                         */</span>
00189                         <span class="keywordflow">for</span>(i=0;i&lt;datalen;i++)
00190                                 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
00191                                 
00192                         <span class="comment">/* If needed initialize data sending</span>
00193 <span class="comment">                         * by setting udp_demo_senddata variable or</span>
00194 <span class="comment">                         * send data directly from event listener (</span>
00195 <span class="comment">                         * only possible for UDP applications!!!!</span>
00196 <span class="comment">                         */</span>
00197                          
00198                         <span class="keywordflow">break</span>;
00199                         
00200                 <span class="keywordflow">default</span>:
00201                         <span class="comment">/* should never get here */</span>
00202                         DEBUGOUT(<span class="stringliteral">"Unknown UDP event :-("</span>);
00203                         <span class="keywordflow">break</span>;
00204         }
00205         <span class="keywordflow">return</span> 0;
00206 }
00207 
00208 <span class="comment">/* internal function invoked to send UDP message to, in this case,</span>
00209 <span class="comment"> * some predefined host.</span>
00210 <span class="comment"> */</span>
00211 <span class="preprocessor">#define MSG_SIZE 20</span>
00212 <span class="preprocessor"></span>INT16 udp_demo_send(<span class="keywordtype">void</span>){
00213         UINT8   i;
00214         
00215         <span class="comment">/* put message in buffer. Message needs to start from UDP_APP_OFFSET</span>
00216 <span class="comment">         * because TCP/IP stack will put headers in front of the message to</span>
00217 <span class="comment">         * avoid data copying</span>
00218 <span class="comment">         */</span>
00219         <span class="keywordflow">for</span>(i=0;i&lt;MSG_SIZE;i++)
00220                 net_buf[<a class="code" href="tcp__ip_8h.html#a62">UDP_APP_OFFSET</a>+i]=i;
00221         
00222         <span class="comment">/* send message         */</span>
00223         <span class="keywordflow">return</span> <a class="code" href="udp_8c.html#a7">udp_send</a>(<a class="code" href="udp__demo_8c.html#a4">udp_demo_soch</a>,<a class="code" href="udp__demo_8c.html#a1">UDP_DEMO_RMTHOST_IP</a>,<a class="code" href="udp__demo_8c.html#a2">UDP_DEMO_RMTHOST_PRT</a>,net_buf+<a class="code" href="tcp__ip_8h.html#a62">UDP_APP_OFFSET</a>,<a class="code" href="group__opentcp__config.html#a4">NETWORK_TX_BUFFER_SIZE</a>-<a class="code" href="tcp__ip_8h.html#a62">UDP_APP_OFFSET</a>,MSG_SIZE);
00224         
00225 }
</pre></div><hr><address style="align: right;"><small>Generated on Sun Aug 3 20:32:59 2003 for OpenTCP by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 
width=110 height=53></a>1.2.18 </small></address>
</body>
</html>