2 FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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66 * A number of sockets are created and added to a set. One task then blocks on
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67 * the set while the other task sends data to a (pseudo) random member of the
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71 /* Standard includes. */
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75 /* FreeRTOS includes. */
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76 #include "FreeRTOS.h"
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79 /* FreeRTOS+UDP includes. */
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80 #include "FreeRTOS_UDP_IP.h"
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81 #include "FreeRTOS_Sockets.h"
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83 #define selTINY_DELAY ( ( portTickType ) 2 )
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84 #define selNUMBER_OF_SOCKETS ( 3 )
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85 #define selSELECT_QUEUE_SIZE ( selNUMBER_OF_SOCKETS * 2 )
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88 * Sends data to multiple different sockets.
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90 static void prvMultipleSocketTxTask( void *pvParameters );
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93 * Uses the FreeRTOS_select() API function to receive from multiple sockets.
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95 static void prvMultipleSocketRxTask( void *pvParameters );
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97 /*-----------------------------------------------------------*/
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99 static xSocket_t xRxSockets[ selNUMBER_OF_SOCKETS ] = { 0 };
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101 /*-----------------------------------------------------------*/
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103 void vStartSelectUDPServerTasks( uint16_t usStackSize, uint32_t ulFirstPortNumber, unsigned portBASE_TYPE uxPriority )
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105 /* Create task that sends to multiple sockets, and the task that uses the
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106 FreeRTOS_select() function to receive from multiple sockets. The first
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107 port number to use is passed into both tasks using the task's parameter.
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108 Other port numbers are consecutive from the first. */
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109 xTaskCreate( prvMultipleSocketTxTask, ( const signed char * const ) "MultiTx", usStackSize, ( void * ) ulFirstPortNumber, uxPriority, NULL );
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110 xTaskCreate( prvMultipleSocketRxTask, ( const signed char * const ) "MultiRx", usStackSize, ( void * ) ulFirstPortNumber, uxPriority, NULL );
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112 /*-----------------------------------------------------------*/
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114 static void prvMultipleSocketRxTask( void *pvParameters )
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116 xSocketSet_t xFD_Set;
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118 struct freertos_sockaddr xAddress;
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119 uint32_t xClientLength = sizeof( struct freertos_sockaddr ), ulFirstRxPortNumber, x;
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120 uint32_t ulReceivedValue = 0, ulExpectedValue = 0UL, ulReceivedCount[ selNUMBER_OF_SOCKETS ] = { 0 };
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122 const portTickType xRxBlockTime = 0;
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124 /* The number of the port the first Rx socket will be bound to is passed in
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125 as the task parameter. Other port numbers used are consecutive from this. */
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126 ulFirstRxPortNumber = ( uint32_t ) pvParameters;
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128 /* Create the set of sockets that will be passed into FreeRTOS_select(). */
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129 xFD_Set = FreeRTOS_CreateSocketSet( selSELECT_QUEUE_SIZE );
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131 for( x = 0; x < selNUMBER_OF_SOCKETS; x++ )
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133 /* Create the next Rx socket. */
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134 xRxSockets[ x ] = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_DGRAM, FREERTOS_IPPROTO_UDP );
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135 configASSERT( xRxSockets[ x ] );
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137 /* Bind to the next port number. */
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138 xAddress.sin_port = FreeRTOS_htons( ( uint16_t ) ( ulFirstRxPortNumber + x ) );
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139 FreeRTOS_bind( xRxSockets[ x ], &xAddress, sizeof( struct freertos_sockaddr ) );
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141 /* There should always be data available on the socket returned from
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142 FreeRTOS_select() so blocking on a read should not be necessary. */
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143 FreeRTOS_setsockopt( xRxSockets[ x ], 0, FREERTOS_SO_RCVTIMEO, &xRxBlockTime, sizeof( xRxBlockTime ) );
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145 /* Add the created socket to the set. */
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146 FreeRTOS_FD_SET( xRxSockets[ x ], xFD_Set );
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151 /* Wait for a socket from the set to become available for reading. */
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152 xSocket = FreeRTOS_select( xFD_Set, portMAX_DELAY );
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154 /* xSocket should never be NULL because FreeRTOS_select() was called
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155 with an indefinite delay (assuming INCLUDE_vTaskSuspend is set to 1). */
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156 configASSERT( xSocket );
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158 lBytes = FreeRTOS_recvfrom( xSocket, &( ulReceivedValue ), sizeof( uint32_t ), 0, &xAddress, &xClientLength );
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160 /* It is possible that the first value received will not be zero
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161 because the first few transmitted packets may have been dropped to
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162 send an ARP and then wait the ARP reply. */
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163 if( ulExpectedValue == 0 )
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165 if( ulExpectedValue != ulReceivedValue )
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167 /* Correct for packets lost to ARP traffic. */
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168 ulExpectedValue = ulReceivedValue;
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172 /* Data should always be available even though the block time was set
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173 to zero because the socket was returned from FreeRTOS_select(). */
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174 configASSERT( lBytes == 4 );
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175 configASSERT( ulReceivedValue == ulExpectedValue );
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179 /* Keep a record of the number of times each socket has been used so it
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180 can be verified (using the debugger) that they all get used. */
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181 for( x= 0; x < selNUMBER_OF_SOCKETS; x++ )
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183 if( xSocket == xRxSockets[ x ] )
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185 ( ulReceivedCount[ x ] )++;
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191 /*-----------------------------------------------------------*/
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193 static void prvMultipleSocketTxTask( void *pvParameters )
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195 uint32_t ulTxValue = 0;
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196 struct freertos_sockaddr xDestinationAddress;
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197 uint32_t ulIPAddress, ulFirstDestinationPortNumber, xPortNumber;
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198 xSocket_t xTxSocket;
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199 const portTickType xShortDelay = 100 / portTICK_RATE_MS, xSendBlockTime = 500 / portTICK_RATE_MS;
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201 srand( ( unsigned int ) &xPortNumber );
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203 /* The first destination port number is passed in as the task parameter.
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204 Other destination port numbers used are consecutive from this. */
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205 ulFirstDestinationPortNumber = ( uint32_t ) pvParameters;
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207 /* Create the socket used to send to the sockets created by the Rx task.
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208 Let the IP stack select a port to bind to. */
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209 xTxSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_DGRAM, FREERTOS_IPPROTO_UDP );
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210 FreeRTOS_bind( xTxSocket, NULL, sizeof( struct freertos_sockaddr ) );
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212 /* The Rx and Tx tasks execute at the same priority so it is possible that
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213 the Tx task will fill up the send queue - set a Tx block time to ensure
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214 flow control is managed if this happens. */
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215 FreeRTOS_setsockopt( xTxSocket, 0, FREERTOS_SO_SNDTIMEO, &xSendBlockTime, sizeof( xSendBlockTime ) );
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217 /* It is assumed that this task is not created until the network is up,
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218 so the IP address can be obtained immediately. Store the IP address being
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219 used in ulIPAddress. This is done so the socket can send to a different
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220 port on the same IP address. */
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221 FreeRTOS_GetAddressConfiguration( &ulIPAddress, NULL, NULL, NULL );
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223 /* This test sends to itself, so data sent from here is received by a server
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224 socket on the same IP address. Setup the freertos_sockaddr structure with
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225 this nodes IP address. */
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226 xDestinationAddress.sin_addr = ulIPAddress;
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228 /* Block for a short time to ensure the task implemented by the
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229 prvMultipleSocketRxTask() function has finished creating the Rx sockets. */
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230 vTaskDelay( xShortDelay );
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234 /* Pseudo randomly select the destination port number from the range of
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235 valid destination port numbers. */
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236 xPortNumber = rand() % selNUMBER_OF_SOCKETS;
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237 xDestinationAddress.sin_port = ( uint16_t ) ( ulFirstDestinationPortNumber + xPortNumber );
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238 xDestinationAddress.sin_port = FreeRTOS_htons( xDestinationAddress.sin_port );
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240 /* Send an incrementing value. */
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241 FreeRTOS_sendto( xTxSocket, &ulTxValue, sizeof( ulTxValue ), 0, &xDestinationAddress, sizeof( xDestinationAddress ) );
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244 /* Delay here because in the Windows simulator the MAC interrupt
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245 simulator delays, so network trafic cannot be received any faster
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247 vTaskDelay( configWINDOWS_MAC_INTERRUPT_SIMULATOR_DELAY );
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