2 * FreeRTOS Kernel V10.0.1
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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29 * A number of sockets are created and added to a set. One task then blocks on
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30 * the set while the other task sends data to a (pseudo) random member of the
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34 /* Standard includes. */
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38 /* FreeRTOS includes. */
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39 #include "FreeRTOS.h"
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42 /* FreeRTOS+UDP includes. */
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43 #include "FreeRTOS_UDP_IP.h"
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44 #include "FreeRTOS_Sockets.h"
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46 #define selTINY_DELAY ( ( TickType_t ) 2 )
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47 #define selNUMBER_OF_SOCKETS ( 3 )
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48 #define selSELECT_QUEUE_SIZE ( selNUMBER_OF_SOCKETS * 2 )
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51 * Sends data to multiple different sockets.
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53 static void prvMultipleSocketTxTask( void *pvParameters );
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56 * Uses the FreeRTOS_select() API function to receive from multiple sockets.
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58 static void prvMultipleSocketRxTask( void *pvParameters );
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60 /*-----------------------------------------------------------*/
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62 static xSocket_t xRxSockets[ selNUMBER_OF_SOCKETS ] = { 0 };
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64 /*-----------------------------------------------------------*/
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66 void vStartSelectUDPServerTasks( uint16_t usStackSize, uint32_t ulFirstPortNumber, UBaseType_t uxPriority )
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68 /* Create task that sends to multiple sockets, and the task that uses the
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69 FreeRTOS_select() function to receive from multiple sockets. The first
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70 port number to use is passed into both tasks using the task's parameter.
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71 Other port numbers are consecutive from the first. */
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72 xTaskCreate( prvMultipleSocketTxTask, "MultiTx", usStackSize, ( void * ) ulFirstPortNumber, uxPriority, NULL );
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73 xTaskCreate( prvMultipleSocketRxTask, "MultiRx", usStackSize, ( void * ) ulFirstPortNumber, uxPriority, NULL );
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75 /*-----------------------------------------------------------*/
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77 static void prvMultipleSocketRxTask( void *pvParameters )
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79 xSocketSet_t xFD_Set;
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81 struct freertos_sockaddr xAddress;
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82 uint32_t xClientLength = sizeof( struct freertos_sockaddr ), ulFirstRxPortNumber, x;
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83 uint32_t ulReceivedValue = 0, ulExpectedValue = 0UL, ulReceivedCount[ selNUMBER_OF_SOCKETS ] = { 0 };
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85 const TickType_t xRxBlockTime = 0;
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87 /* The number of the port the first Rx socket will be bound to is passed in
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88 as the task parameter. Other port numbers used are consecutive from this. */
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89 ulFirstRxPortNumber = ( uint32_t ) pvParameters;
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91 /* Create the set of sockets that will be passed into FreeRTOS_select(). */
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92 xFD_Set = FreeRTOS_CreateSocketSet( selSELECT_QUEUE_SIZE );
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94 for( x = 0; x < selNUMBER_OF_SOCKETS; x++ )
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96 /* Create the next Rx socket. */
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97 xRxSockets[ x ] = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_DGRAM, FREERTOS_IPPROTO_UDP );
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98 configASSERT( xRxSockets[ x ] );
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100 /* Bind to the next port number. */
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101 xAddress.sin_port = FreeRTOS_htons( ( uint16_t ) ( ulFirstRxPortNumber + x ) );
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102 FreeRTOS_bind( xRxSockets[ x ], &xAddress, sizeof( struct freertos_sockaddr ) );
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104 /* There should always be data available on the socket returned from
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105 FreeRTOS_select() so blocking on a read should not be necessary. */
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106 FreeRTOS_setsockopt( xRxSockets[ x ], 0, FREERTOS_SO_RCVTIMEO, &xRxBlockTime, sizeof( xRxBlockTime ) );
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108 /* Add the created socket to the set. */
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109 FreeRTOS_FD_SET( xRxSockets[ x ], xFD_Set );
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114 /* Wait for a socket from the set to become available for reading. */
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115 xSocket = FreeRTOS_select( xFD_Set, portMAX_DELAY );
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117 /* xSocket should never be NULL because FreeRTOS_select() was called
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118 with an indefinite delay (assuming INCLUDE_vTaskSuspend is set to 1). */
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119 configASSERT( xSocket );
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121 lBytes = FreeRTOS_recvfrom( xSocket, &( ulReceivedValue ), sizeof( uint32_t ), 0, &xAddress, &xClientLength );
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123 /* It is possible that the first value received will not be zero
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124 because the first few transmitted packets may have been dropped to
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125 send an ARP and then wait the ARP reply. */
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126 if( ulExpectedValue == 0 )
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128 if( ulExpectedValue != ulReceivedValue )
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130 /* Correct for packets lost to ARP traffic. */
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131 ulExpectedValue = ulReceivedValue;
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135 /* Data should always be available even though the block time was set
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136 to zero because the socket was returned from FreeRTOS_select(). */
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137 configASSERT( lBytes == 4 );
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138 configASSERT( ulReceivedValue == ulExpectedValue );
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142 /* Keep a record of the number of times each socket has been used so it
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143 can be verified (using the debugger) that they all get used. */
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144 for( x= 0; x < selNUMBER_OF_SOCKETS; x++ )
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146 if( xSocket == xRxSockets[ x ] )
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148 ( ulReceivedCount[ x ] )++;
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154 /*-----------------------------------------------------------*/
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156 static void prvMultipleSocketTxTask( void *pvParameters )
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158 uint32_t ulTxValue = 0;
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159 struct freertos_sockaddr xDestinationAddress;
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160 uint32_t ulIPAddress, ulFirstDestinationPortNumber, xPortNumber;
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161 xSocket_t xTxSocket;
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162 const TickType_t xShortDelay = 100 / portTICK_RATE_MS, xSendBlockTime = 500 / portTICK_RATE_MS;
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164 srand( ( unsigned int ) &xPortNumber );
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166 /* The first destination port number is passed in as the task parameter.
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167 Other destination port numbers used are consecutive from this. */
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168 ulFirstDestinationPortNumber = ( uint32_t ) pvParameters;
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170 /* Create the socket used to send to the sockets created by the Rx task.
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171 Let the IP stack select a port to bind to. */
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172 xTxSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_DGRAM, FREERTOS_IPPROTO_UDP );
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173 FreeRTOS_bind( xTxSocket, NULL, sizeof( struct freertos_sockaddr ) );
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175 /* The Rx and Tx tasks execute at the same priority so it is possible that
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176 the Tx task will fill up the send queue - set a Tx block time to ensure
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177 flow control is managed if this happens. */
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178 FreeRTOS_setsockopt( xTxSocket, 0, FREERTOS_SO_SNDTIMEO, &xSendBlockTime, sizeof( xSendBlockTime ) );
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180 /* It is assumed that this task is not created until the network is up,
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181 so the IP address can be obtained immediately. Store the IP address being
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182 used in ulIPAddress. This is done so the socket can send to a different
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183 port on the same IP address. */
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184 FreeRTOS_GetAddressConfiguration( &ulIPAddress, NULL, NULL, NULL );
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186 /* This test sends to itself, so data sent from here is received by a server
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187 socket on the same IP address. Setup the freertos_sockaddr structure with
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188 this nodes IP address. */
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189 xDestinationAddress.sin_addr = ulIPAddress;
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191 /* Block for a short time to ensure the task implemented by the
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192 prvMultipleSocketRxTask() function has finished creating the Rx sockets. */
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193 vTaskDelay( xShortDelay );
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197 /* Pseudo randomly select the destination port number from the range of
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198 valid destination port numbers. */
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199 xPortNumber = rand() % selNUMBER_OF_SOCKETS;
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200 xDestinationAddress.sin_port = ( uint16_t ) ( ulFirstDestinationPortNumber + xPortNumber );
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201 xDestinationAddress.sin_port = FreeRTOS_htons( xDestinationAddress.sin_port );
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203 /* Send an incrementing value. */
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204 FreeRTOS_sendto( xTxSocket, &ulTxValue, sizeof( ulTxValue ), 0, &xDestinationAddress, sizeof( xDestinationAddress ) );
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207 /* Delay here because in the Windows simulator the MAC interrupt
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208 simulator delays, so network trafic cannot be received any faster
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210 vTaskDelay( configWINDOWS_MAC_INTERRUPT_SIMULATOR_DELAY );
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