udp__demo_8c-example.html

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                DEBUGOUT(<span class="stringliteral">"No free UDP sockets!! \r\n"</span>);
                <a name="a1"></a><a class="code" href="system_8h.html#a6">RESET_SYSTEM</a>();
        }
        
        <span class="comment">/* open socket for receiving/sending of the data on defined port*/</span>
        <a name="a2"></a><a class="code" href="group__udp__app__api.html#a2">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>);
        
        <span class="comment">/* for now no data sending */</span>
        <a class="code" href="udp__demo_8c.html#a5">udp_demo_senddata</a>=0;
}

<span class="comment">/* UDP Demo app main loop that is periodically invoked from the</span>
<span class="comment"> * main loop (see main_demo.c)</span>
<span class="comment"> */</span>
<span class="keywordtype">void</span> udp_demo_run(<span class="keywordtype">void</span>){
        <span class="comment">/* do maybe some other UDP demo app stuff</span>
<span class="comment">         * .....</span>
<span class="comment">         */</span>
        <span class="keywordflow">if</span>(udp_demo_senddata) {
                <span class="keywordflow">switch</span>(udp_demo_send()){
                        <span class="keywordflow">case</span> -1:
                                DEBUGOUT(<span class="stringliteral">"Error (General error, e.g. parameters)\r\n"</span>);
                                <span class="keywordflow">break</span>; 
                        <span class="keywordflow">case</span> -2:
                                DEBUGOUT(<span class="stringliteral">"ARP or lower layer not ready, try again\r\n"</span>);
                                <span class="keywordflow">break</span>;
                        <span class="keywordflow">case</span> -3:
                                DEBUGOUT(<span class="stringliteral">"Socket closed or socket handle not valid!\r\n"</span>);
                                <span class="keywordflow">break</span>;
                        <span class="keywordflow">default</span>:
                                <span class="comment">/* data sent (could check how many bytes too)</span>
<span class="comment">                                 * if no more data to send, reset flag</span>
<span class="comment">                                 */</span>
                                <a class="code" href="udp__demo_8c.html#a5">udp_demo_senddata</a>=0;
                                <span class="keywordflow">break</span>;
                
                }
        }
}

<span class="comment">/*</span>
<span class="comment"> * Event listener invoked when TCP/IP stack receives UDP datagram for</span>
<span class="comment"> * a given socket. Parameters:</span>
<span class="comment"> * - cbhandle - handle of the socket this packet is intended for. Check it</span>
<span class="comment"> *      just to be sure, but in general case not needed</span>
<span class="comment"> * - event - event that is notified. For UDP, only UDP_EVENT_DATA</span>
<span class="comment"> * - ipaddr - IP address of remote host who sent the UDP datagram</span>
<span class="comment"> * - port - port number of remote host who sent the UDP datagram</span>
<span class="comment"> * - buffindex - buffer index in RTL8019AS allowing you to read </span>
<span class="comment"> *      received data more than once from Ethernet controller by</span>
<span class="comment"> *      invoking NETWORK_RECEIVE_INITIALIZE(buffindex) and then start</span>
<span class="comment"> *      reading the bytes all over again</span>
<span class="comment"> */</span> 
INT32 udp_demo_eventlistener(INT8 cbhandle, UINT8 event, UINT32 ipaddr, UINT16 port, UINT16 buffindex, UINT16 datalen){
        UINT16 i;
        <span class="keywordflow">if</span>(cbhandle!=<a class="code" href="udp__demo_8c.html#a4">udp_demo_soch</a>){
                DEBUGOUT(<span class="stringliteral">"Not my handle!!!!"</span>);
                <span class="keywordflow">return</span> (-1);
        }
        
        <span class="keywordflow">switch</span>(event){
                <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a31">UDP_EVENT_DATA</a>:
                        
                        <span class="comment">/* read data that was received (and </span>
<span class="comment">                         * probably do something with it :-)</span>
<span class="comment">                         */</span>
                        <span class="keywordflow">for</span>(i=0;i&lt;datalen;i++)
                                <a name="a3"></a><a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
                                
                        <span class="comment">/* If needed initialize data sending</span>
<span class="comment">                         * by setting udp_demo_senddata variable or</span>
<span class="comment">                         * send data directly from event listener (</span>
<span class="comment">                         * only possible for UDP applications!!!!</span>
<span class="comment">                         */</span>
                         
                        <span class="keywordflow">break</span>;
                        
                <span class="keywordflow">default</span>:
                        <span class="comment">/* should never get here */</span>
                        DEBUGOUT(<span class="stringliteral">"Unknown UDP event :-("</span>);
                        <span class="keywordflow">break</span>;
        }
        <span class="keywordflow">return</span> 0;
}

<span class="comment">/* internal function invoked to send UDP message to, in this case,</span>
<span class="comment"> * some predefined host.</span>
<span class="comment"> */</span>
<span class="preprocessor">#define MSG_SIZE 20</span>
<span class="preprocessor"></span>INT16 udp_demo_send(<span class="keywordtype">void</span>){
        UINT8   i;
        
        <span class="comment">/* put message in buffer. Message needs to start from UDP_APP_OFFSET</span>
<span class="comment">         * because TCP/IP stack will put headers in front of the message to</span>
<span class="comment">         * avoid data copying</span>
<span class="comment">         */</span>
        <span class="keywordflow">for</span>(i=0;i&lt;MSG_SIZE;i++)
                net_buf[<a class="code" href="tcp__ip_8h.html#a62">UDP_APP_OFFSET</a>+i]=i;
        
        <span class="comment">/* send message         */</span>
        <span class="keywordflow">return</span> <a name="a4"></a><a class="code" href="group__udp__app__api.html#a4">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);
        
}
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