begriffs open source - cmsis-freertos/blob - Demo/lwIP_Demo_Rowley

1 /*

4

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13 ***************************************************************************

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18 ***************************************************************************

19

20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY

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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following

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25 ***************************************************************************

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67 1 tab == 4 spaces!

68 */

69

70 /*

71 Implements a simplistic WEB server. Every time a connection is made and

72 data is received a dynamic page that shows the current TCP/IP statistics

73 is generated and returned. The connection is then closed.

74

75 This file was adapted from a FreeRTOS lwIP slip demo supplied by a third

76 party.

77 */

78

79 /*

80 Changes from V3.2.2

81

82 + Changed the page returned by the lwIP WEB server demo to display the

83 task status table rather than the TCP/IP statistics.

84 */

85

86

87 /* Standard includes. */

88 #include <stdio.h>

89 #include <string.h>

90

91 /* Scheduler includes. */

92 #include "FreeRTOS.h"

93 #include "task.h"

94 #include "semphr.h"

95

96 /* Demo includes. */

97 #include "BasicWEB.h"

98 #include "SAM7_EMAC.h"

99

100 /* lwIP includes. */

101 #include "lwip/api.h"

102 #include "lwip/tcpip.h"

103 #include "lwip/memp.h"

104 #include "lwip/stats.h"

105 #include "netif/loopif.h"

106

107 /* The size of the buffer in which the dynamic WEB page is created. */

108 #define webMAX_PAGE_SIZE 2048

109

110 /* Standard GET response. */

111 #define webHTTP_OK "HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n"

112

113 /* The port on which we listen. */

114 #define webHTTP_PORT ( 80 )

115

116 /* Delay on close error. */

117 #define webSHORT_DELAY ( 10 )

118

119 /* Format of the dynamic page that is returned on each connection. */

120 #define webHTML_START \

121 "<html>\

122 <head>\

123 </head>\

124 <BODY onLoad=\"window.setTimeout("location.href='index.html'",1000)\"bgcolor=\"#CCCCff\">\

125 \r\nPage Hits = "

126

127 #define webHTML_END \

128 "\r\n</pre>\

129 \r\n</BODY>\

130 </html>"

131

132 /*------------------------------------------------------------*/

133

134 /*

135 * Process an incoming connection on port 80.

136 *

137 * This simply checks to see if the incoming data contains a GET request, and

138 * if so sends back a single dynamically created page. The connection is then

139 * closed. A more complete implementation could create a task for each

140 * connection.

141 */

142 static void vProcessConnection( struct netconn *pxNetCon );

143

144 /*------------------------------------------------------------*/

145

146 static void vProcessConnection( struct netconn *pxNetCon )

147 {

148 static char cDynamicPage[ webMAX_PAGE_SIZE ], cPageHits[ 11 ];

149 struct netbuf *pxRxBuffer;

150 char *pcRxString;

151 unsigned short usLength;

152 static unsigned long ulPageHits = 0;

153

154 /* We expect to immediately get data. */

155 pxRxBuffer = netconn_recv( pxNetCon );

156

157 if( pxRxBuffer != NULL )

158 {

159 /* Where is the data? */

160 netbuf_data( pxRxBuffer, ( void * ) &pcRxString, &usLength );

161

162 /* Is this a GET? We don't handle anything else. */

163 if( !strncmp( pcRxString, "GET", 3 ) )

164 {

165 pcRxString = cDynamicPage;

166

167 /* Update the hit count. */

168 ulPageHits++;

169 sprintf( cPageHits, "%lu", ulPageHits );

170

171 /* Write out the HTTP OK header. */

172 netconn_write(pxNetCon, webHTTP_OK, (u16_t)strlen( webHTTP_OK ), NETCONN_COPY );

173

174 /* Generate the dynamic page...

175

176 ... First the page header. */

177 strcpy( cDynamicPage, webHTML_START );

178 /* ... Then the hit count... */

179 strcat( cDynamicPage, cPageHits );

180 strcat( cDynamicPage, "<p><pre>Task State Priority Stack #<br>************************************************<br>" );

181 /* ... Then the list of tasks and their status... */

182 vTaskList( cDynamicPage + strlen( cDynamicPage ) );

183 /* ... Finally the page footer. */

184 strcat( cDynamicPage, webHTML_END );

185

186 /* Write out the dynamically generated page. */

187 netconn_write(pxNetCon, cDynamicPage, (u16_t)strlen( cDynamicPage ), NETCONN_COPY );

188 }

189

190 netbuf_delete( pxRxBuffer );

191 }

192

193 netconn_close( pxNetCon );

194 }

195 /*------------------------------------------------------------*/

196

197 void vlwIPInit( void )

198 {

199 /* Initialize lwIP and its interface layer. */

200 sys_init();

201 mem_init();

202 memp_init();

203 pbuf_init();

204 netif_init();

205 ip_init();

206 tcpip_init( NULL, NULL );

207 }

208 /*------------------------------------------------------------*/

209

210 void vBasicWEBServer( void *pvParameters )

211 {

212 struct netconn *pxHTTPListener, *pxNewConnection;

213 struct ip_addr xIpAddr, xNetMast, xGateway;

214 extern err_t ethernetif_init( struct netif *netif );

215 static struct netif EMAC_if;

216

217 /* Parameters are not used - suppress compiler error. */

218 ( void ) pvParameters;

219

220

221 /* Create and configure the EMAC interface. */

222 IP4_ADDR(&xIpAddr,emacIPADDR0,emacIPADDR1,emacIPADDR2,emacIPADDR3);

223 IP4_ADDR(&xNetMast,emacNET_MASK0,emacNET_MASK1,emacNET_MASK2,emacNET_MASK3);

224 IP4_ADDR(&xGateway,emacGATEWAY_ADDR0,emacGATEWAY_ADDR1,emacGATEWAY_ADDR2,emacGATEWAY_ADDR3);

225 netif_add(&EMAC_if, &xIpAddr, &xNetMast, &xGateway, NULL, ethernetif_init, tcpip_input);

226

227 /* make it the default interface */

228 netif_set_default(&EMAC_if);

229

230 /* bring it up */

231 netif_set_up(&EMAC_if);

232

233 /* Create a new tcp connection handle */

234

235 pxHTTPListener = netconn_new( NETCONN_TCP );

236 netconn_bind(pxHTTPListener, NULL, webHTTP_PORT );

237 netconn_listen( pxHTTPListener );

238

239 /* Loop forever */

240 for( ;; )

241 {

242 /* Wait for connection. */

243 pxNewConnection = netconn_accept(pxHTTPListener);

244

245 if(pxNewConnection != NULL)

246 {

247 /* Service connection. */

248 vProcessConnection( pxNewConnection );

249 while( netconn_delete( pxNewConnection ) != ERR_OK )

250 {

251 vTaskDelay( webSHORT_DELAY );

252 }

253 }

254 }

255 }

256

257