webport_8c-source.html

针对AVR单片机开发的嵌入式操作系统

00145 <span class="preprocessor"></span><span class="comment"></span>
00146 <span class="comment">/*!</span>
00147 <span class="comment"> * \addtogroup xgWebPort</span>
00148 <span class="comment"> */</span><span class="comment"></span>
00149 <span class="comment">/*@{*/</span>
00150 <span class="comment"></span>
00151 <span class="comment">/*!</span>
00152 <span class="comment"> * \brief CPU reset macro.</span>
00153 <span class="comment"> *</span>
00154 <span class="comment"> * Start all over on fatal initialization errors.</span>
00155 <span class="comment"> *</span>
00156 <span class="comment"> * \note This function currently works on AVR systems only. On other </span>
00157 <span class="comment"> *       architectures an endless loop will be entered.</span>
00158 <span class="comment"> */</span>
00159 <span class="preprocessor">#if defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__)</span>
<a name="l00160"></a><a class="code" href="group__xg_web_port.html#ga3">00160</a> <span class="preprocessor"></span><span class="preprocessor">#define JUMP_RESET { asm("cli"); asm("call 0"); }</span>
00161 <span class="preprocessor"></span><span class="preprocessor">#else</span>
00162 <span class="preprocessor"></span><span class="preprocessor">#define JUMP_RESET for(;;)</span>
00163 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00164 <span class="preprocessor"></span><span class="comment"></span>
00165 <span class="comment">/*!</span>
00166 <span class="comment"> * \brief Process a single HTTP request.</span>
00167 <span class="comment"> *</span>
00168 <span class="comment"> * This routine performs the whole cycle of a HTTP request.</span>
00169 <span class="comment"> *</span>
00170 <span class="comment"> * - Creating a socket.</span>
00171 <span class="comment"> * - Listening on the defined port.</span>
00172 <span class="comment"> * - Processing the request.</span>
00173 <span class="comment"> * - Closing the socket.</span>
00174 <span class="comment"> */</span>
<a name="l00175"></a><a class="code" href="group__xg_web_port.html#ga0">00175</a> <span class="keywordtype">void</span> <a class="code" href="group__xg_web_port.html#ga0">Service</a>(<span class="keywordtype">void</span>)
00176 {
00177     TCPSOCKET *sock;            <span class="comment">/* TCP socket pointer. */</span>
00178     FILE *stream;               <span class="comment">/* TCP stream. */</span>
00179     u_long to = 5000;
00180 
00181     <span class="comment">/*</span>
00182 <span class="comment">     * Let the Nut/OS library create a TCP socket for us.</span>
00183 <span class="comment">     */</span>
00184     <span class="keywordflow">if</span> ((sock = NutTcpCreateSocket()) != 0) {
00185 
00186         NutTcpSetSockOpt(sock, SO_RCVTIMEO, &amp;to, <span class="keyword">sizeof</span>(to));
00187 
00188         <span class="comment">/*</span>
00189 <span class="comment">         * Listen on the port defined in webport.h. Typically this is</span>
00190 <span class="comment">         * port 80.</span>
00191 <span class="comment">         */</span>
00192         <span class="keywordflow">if</span> (NutTcpAccept(sock, <a class="code" href="group__xg_w_p_defs.html#ga4">HTTP_PORT</a>) == 0) {
00193             <span class="comment">/*</span>
00194 <span class="comment">             * The Nut/OS memory manager dynamically allocates and </span>
00195 <span class="comment">             * releases SRAM space. In this application most memory is </span>
00196 <span class="comment">             * used by incoming telegrams and the socket interface. If </span>
00197 <span class="comment">             * the available space becomes low, we sleep for 200 </span>
00198 <span class="comment">             * milliseconds and try again. This way we will always leave </span>
00199 <span class="comment">             * some RAM for more important parts of the system.</span>
00200 <span class="comment">             *</span>
00201 <span class="comment">             * The watermark is defined in webport.h.</span>
00202 <span class="comment">             */</span>
00203             <span class="keywordflow">while</span> (NutHeapAvailable() &lt; <a class="code" href="group__xg_w_p_defs.html#ga5">LOW_MEM_MARK</a>) {
00204                 NutSleep(200);
00205             }
00206 
00207             <span class="comment">/*</span>
00208 <span class="comment">             * Create a stream from the socket, so we can use stdio.</span>
00209 <span class="comment">             */</span>
00210             <span class="keywordflow">if</span> ((stream = _fdopen((<span class="keywordtype">int</span>) sock, <span class="stringliteral">"r+b"</span>)) != 0) {
00211                 <span class="comment">/*</span>
00212 <span class="comment">                 * Process HTTP request. This routine is part of the</span>
00213 <span class="comment">                 * Nut/OS libraries and greatly simplifies our application</span>
00214 <span class="comment">                 * code. It will automatically read requested files from</span>
00215 <span class="comment">                 * the file system and send them to the browser or</span>
00216 <span class="comment">                 * call the proper CGI routines.</span>
00217 <span class="comment">                 */</span>
00218                 NutHttpProcessRequest(stream);
00219 
00220                 <span class="comment">/*</span>
00221 <span class="comment">                 * Close the stream to release its resources.</span>
00222 <span class="comment">                 */</span>
00223                 fclose(stream);
00224             }
00225         }
00226 
00227         <span class="comment">/*</span>
00228 <span class="comment">         * Close the socket. If the client didn't close the connection yet,</span>
00229 <span class="comment">         * it will now be forced to do so.</span>
00230 <span class="comment">         */</span>
00231         NutTcpCloseSocket(sock);
00232     }
00233 }
00234 <span class="comment"></span>
00235 <span class="comment">/*! \fn ServiceThread(void *arg)</span>
00236 <span class="comment"> * \brief Background thread to process HTTP requests.</span>
00237 <span class="comment"> *</span>
00238 <span class="comment"> * This thread calls Service() in an endless loop. It can be started more</span>
00239 <span class="comment"> * than once to support parallel connections.</span>
00240 <span class="comment"> */</span>
<a name="l00241"></a><a class="code" href="group__xg_web_port.html#ga1">00241</a> THREAD(ServiceThread, arg)
00242 {
00243     <span class="comment">/*</span>
00244 <span class="comment">     * Loop endless for connections.</span>
00245 <span class="comment">     */</span>
00246     <span class="keywordflow">for</span> (;;) {
00247         <a class="code" href="group__xg_web_port.html#ga0">Service</a>();
00248     }
00249 }
00250 <span class="comment"></span>
00251 <span class="comment">/*!</span>
00252 <span class="comment"> * \brief Main entry of our application.</span>
00253 <span class="comment"> *</span>
00254 <span class="comment"> * Nut/OS automatically calls this entry after initialization.</span>
00255 <span class="comment"> * </span>
00256 <span class="comment"> * This routine will do all required initialization, start some</span>
00257 <span class="comment"> * background threads and then process incoming HTTP requests together </span>
00258 <span class="comment"> * with the concurrently running background threads.</span>
00259 <span class="comment"> */</span>
<a name="l00260"></a><a class="code" href="group__xg_web_port.html#ga2">00260</a> <span class="keywordtype">int</span> <a class="code" href="group__xg_web_port.html#ga2">main</a>(<span class="keywordtype">void</span>)
00261 {
00262     u_char i;
00263 
00264     <span class="comment">/*</span>
00265 <span class="comment">     * We may optionally use the serial port for debugging output.</span>
00266 <span class="comment">     */</span>
00267 <span class="preprocessor">#if defined(WP_STATUSOUT) || defined(NUTDEBUG)</span>
00268 <span class="preprocessor"></span>    u_long baud = 115200;
00269 
00270     <span class="comment">/*</span>
00271 <span class="comment">     * All Nut/OS devices must be registered. This serves two purposes.</span>
00272 <span class="comment">     * First, it will create a reference to the device driver code, so</span>
00273 <span class="comment">     * this is linked to the application code. Second, it will initialze</span>
00274 <span class="comment">     * the hardware.</span>
00275 <span class="comment">     *</span>
00276 <span class="comment">     * Nut/OS offers several device drivers for RS232 communication. The </span>
00277 <span class="comment">     * device devDebug0 is prefered for debug output, because it is not</span>
00278 <span class="comment">     * only simple, small and fast, but can also used to create output</span>
00279 <span class="comment">     * from within interrupt routines.</span>
00280 <span class="comment">     */</span>
00281     NutRegisterDevice(&amp;devDebug0, 0, 0);
00282 
00283     <span class="comment">/*</span>
00284 <span class="comment">     * Now, after the device is registered, it is known to the system</span>
00285 <span class="comment">     * by its name. We can use a standard C library routine to open it</span>
00286 <span class="comment">     * as our standard output.</span>
00287 <span class="comment">     */</span>
00288     freopen(<a class="code" href="group__xg_w_p_defs.html#ga3">WP_STATUSOUT</a>, <span class="stringliteral">"w"</span>, stdout);
00289 
00290     <span class="comment">/*</span>
00291 <span class="comment">     * Nut/OS uses _ioctl() to set device specific parameters, like</span>
00292 <span class="comment">     * the baudrate for serial communication.</span>
00293 <span class="comment">     */</span>
00294     _ioctl(_fileno(stdout), UART_SETSPEED, &amp;baud);
00295 
00296     <span class="comment">/*</span>
00297 <span class="comment">     * Now we can use the devDebug0 device for standard output. Let's</span>
00298 <span class="comment">     * print a banner including the Nut/OS version we are running.</span>
00299 <span class="comment">     */</span>
00300     printf(<span class="stringliteral">"\n\nNut/OS %s Webport Daemon\n"</span>, NutVersionString());
00301