2 * FreeRTOS Kernel V10.3.0
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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 /******************************************************************************
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31 * See the following web page for essential TwoEchoClient.c usage and
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32 * configuration details:
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33 * http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_UDP/Embedded_Ethernet_Examples/Common_Echo_Clients.shtml
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35 ******************************************************************************/
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38 /* Standard includes. */
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43 /* FreeRTOS includes. */
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44 #include "FreeRTOS.h"
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47 /* FreeRTOS+UDP includes. */
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48 #include "FreeRTOS_UDP_IP.h"
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49 #include "FreeRTOS_Sockets.h"
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51 /* Small delay used between attempts to obtain a zero copy buffer. */
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52 #define echoTINY_DELAY ( ( TickType_t ) 2 )
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54 /* The echo tasks create a socket, send out a number of echo requests
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55 (listening for each echo reply), then close the socket again before
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56 starting over. This delay is used between each iteration to ensure the
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57 network does not get too congested. */
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58 #define echoLOOP_DELAY ( ( TickType_t ) 250 / portTICK_RATE_MS )
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60 #if ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1
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61 /* When the trace recorder code is included user events are generated to
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62 mark the sending and receiving of the echoed data (only in the zero copy
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64 #define echoMARK_SEND_IN_TRACE_BUFFER( x ) vTraceUserEvent( x )
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65 traceLabel xZeroCopySendEvent, xZeroCopyReceiveEvent;
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68 /* When the trace recorder code is not included just #define away the call
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69 to post the user event. */
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70 #define echoMARK_SEND_IN_TRACE_BUFFER( x )
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71 #define xZeroCopySendEvent 0
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72 #define xZeroCopyReceiveEvent 0
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75 /* The echo server is assumed to be on port 7, which is the standard echo
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77 #define echoECHO_PORT ( 7 )
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80 * Uses a socket to send data to, then receive data from, the standard echo
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81 * port number 7. prvEchoClientTask() uses the standard interface.
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82 * prvZeroCopyEchoClientTask() uses the zero copy interface.
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84 static void prvEchoClientTask( void *pvParameters );
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85 static void prvZeroCopyEchoClientTask( void *pvParameters );
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87 /* The receive timeout is set shorter when the windows simulator is used
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88 because simulated time is slower than real time. */
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90 const TickType_t xReceiveTimeOut = 50 / portTICK_RATE_MS;
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92 const TickType_t xReceiveTimeOut = 500 / portTICK_RATE_MS;
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95 /*-----------------------------------------------------------*/
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97 void vStartEchoClientTasks( uint16_t usTaskStackSize, UBaseType_t uxTaskPriority )
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99 /* Create the echo client task that does not use the zero copy interface. */
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100 xTaskCreate( prvEchoClientTask, /* The function that implements the task. */
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101 "Echo0", /* Just a text name for the task to aid debugging. */
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102 usTaskStackSize, /* The stack size is defined in FreeRTOSIPConfig.h. */
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103 NULL, /* The task parameter, not used in this case. */
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104 uxTaskPriority, /* The priority assigned to the task is defined in FreeRTOSConfig.h. */
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105 NULL ); /* The task handle is not used. */
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107 /* Create the echo client task that does use the zero copy interface. */
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108 xTaskCreate( prvZeroCopyEchoClientTask, /* The function that implements the task. */
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109 "Echo1", /* Just a text name for the task to aid debugging. */
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110 usTaskStackSize, /* The stack size is defined in FreeRTOSIPConfig.h. */
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111 NULL, /* The task parameter, not used in this case. */
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112 uxTaskPriority, /* The priority assigned to the task is defined in FreeRTOSConfig.h. */
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113 NULL ); /* The task handle is not used. */
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115 /*-----------------------------------------------------------*/
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117 static void prvEchoClientTask( void *pvParameters )
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120 struct freertos_sockaddr xEchoServerAddress;
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121 char cTxString[ 25 ], cRxString[ 25 ]; /* Make sure the stack is large enough to hold these. Turn on stack overflow checking during debug to be sure. */
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122 int32_t lLoopCount = 0UL;
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123 const int32_t lMaxLoopCount = 50;
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124 volatile uint32_t ulRxCount = 0UL, ulTxCount = 0UL;
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125 uint32_t xAddressLength = sizeof( xEchoServerAddress );
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127 /* Remove compiler warning about unused parameters. */
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128 ( void ) pvParameters;
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130 /* Echo requests are sent to the echo server. The address of the echo
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131 server is configured by the constants configECHO_SERVER_ADDR0 to
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132 configECHO_SERVER_ADDR3 in FreeRTOSConfig.h. */
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133 xEchoServerAddress.sin_port = FreeRTOS_htons( echoECHO_PORT );
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134 xEchoServerAddress.sin_addr = FreeRTOS_inet_addr_quick( configECHO_SERVER_ADDR0,
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135 configECHO_SERVER_ADDR1,
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136 configECHO_SERVER_ADDR2,
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137 configECHO_SERVER_ADDR3 );
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141 /* Create a socket. */
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142 xSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_DGRAM, FREERTOS_IPPROTO_UDP );
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143 configASSERT( xSocket != FREERTOS_INVALID_SOCKET );
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145 /* Set a time out so a missing reply does not cause the task to block
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147 FreeRTOS_setsockopt( xSocket, 0, FREERTOS_SO_RCVTIMEO, &xReceiveTimeOut, sizeof( xReceiveTimeOut ) );
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149 /* Send a number of echo requests. */
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150 for( lLoopCount = 0; lLoopCount < lMaxLoopCount; lLoopCount++ )
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152 /* Create the string that is sent to the echo server. */
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153 sprintf( cTxString, "Message number %u\r\n", ( unsigned int ) ulTxCount );
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155 /* Send the string to the socket. ulFlags is set to 0, so the zero
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156 copy interface is not used. That means the data from cTxString is
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157 copied into a network buffer inside FreeRTOS_sendto(), and cTxString
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158 can be reused as soon as FreeRTOS_sendto() has returned. 1 is added
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159 to ensure the NULL string terminator is sent as part of the message. */
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160 FreeRTOS_sendto( xSocket, /* The socket being sent to. */
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161 ( void * ) cTxString, /* The data being sent. */
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162 strlen( cTxString ) + 1,/* The length of the data being sent. */
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163 0, /* ulFlags with the FREERTOS_ZERO_COPY bit clear. */
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164 &xEchoServerAddress, /* The destination address. */
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165 sizeof( xEchoServerAddress ) );
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167 /* Keep a count of how many echo requests have been transmitted so
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168 it can be compared to the number of echo replies received. It would
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169 be expected to loose at least one to an ARP message the first time
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170 the connection is created. */
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173 /* Receive data echoed back to the socket. ulFlags is zero, so the
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174 zero copy option is not being used and the received data will be
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175 copied into the buffer pointed to by cRxString. xAddressLength is
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176 not actually used (at the time of writing this comment, anyway) by
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177 FreeRTOS_recvfrom(), but is set appropriately in case future
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178 versions do use it. */
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179 memset( ( void * ) cRxString, 0x00, sizeof( cRxString ) );
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180 FreeRTOS_recvfrom( xSocket, /* The socket being received from. */
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181 cRxString, /* The buffer into which the received data will be written. */
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182 sizeof( cRxString ), /* The size of the buffer provided to receive the data. */
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183 0, /* ulFlags with the FREERTOS_ZERO_COPY bit clear. */
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184 &xEchoServerAddress, /* The address from where the data was sent (the source address). */
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187 /* Compare the transmitted string to the received string. */
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188 if( strcmp( cRxString, cTxString ) == 0 )
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190 /* The echo reply was received without error. */
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195 /* Pause for a short while to ensure the network is not too
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197 vTaskDelay( echoLOOP_DELAY );
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199 /* Close this socket before looping back to create another. */
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200 FreeRTOS_closesocket( xSocket );
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203 /*-----------------------------------------------------------*/
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205 static void prvZeroCopyEchoClientTask( void *pvParameters )
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208 struct freertos_sockaddr xEchoServerAddress;
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209 static char cTxString[ 40 ];
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210 int32_t lLoopCount = 0UL;
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211 volatile uint32_t ulRxCount = 0UL, ulTxCount = 0UL;
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212 uint32_t xAddressLength = sizeof( xEchoServerAddress );
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214 uint8_t *pucUDPPayloadBuffer;
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216 const int32_t lMaxLoopCount = 50;
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217 const char * const pcStringToSend = "Zero copy message number";
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218 /* The buffer is large enough to hold the string, a number, and the string terminator. */
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219 const size_t xBufferLength = strlen( pcStringToSend ) + 15;
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221 #if ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS == 1
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223 /* When the trace recorder code is included user events are generated to
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224 mark the sending and receiving of the echoed data (only in the zero copy
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226 xZeroCopySendEvent = xTraceOpenLabel( "ZeroCopyTx" );
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227 xZeroCopyReceiveEvent = xTraceOpenLabel( "ZeroCopyRx" );
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229 #endif /* ipconfigINCLUDE_EXAMPLE_FREERTOS_PLUS_TRACE_CALLS */
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231 /* Remove compiler warning about unused parameters. */
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232 ( void ) pvParameters;
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234 /* Delay for a little while to ensure the task is out of synch with the
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235 other echo task implemented above. */
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236 vTaskDelay( echoLOOP_DELAY >> 1 );
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238 /* Echo requests are sent to the echo server. The address of the echo
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239 server is configured by the constants configECHO_SERVER_ADDR0 to
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240 configECHO_SERVER_ADDR3 in FreeRTOSConfig.h. */
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241 xEchoServerAddress.sin_port = FreeRTOS_htons( echoECHO_PORT );
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242 xEchoServerAddress.sin_addr = FreeRTOS_inet_addr_quick( configECHO_SERVER_ADDR0,
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243 configECHO_SERVER_ADDR1,
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244 configECHO_SERVER_ADDR2,
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245 configECHO_SERVER_ADDR3 );
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249 /* Create a socket. */
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250 xSocket = FreeRTOS_socket( FREERTOS_AF_INET, FREERTOS_SOCK_DGRAM, FREERTOS_IPPROTO_UDP );
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251 configASSERT( xSocket != FREERTOS_INVALID_SOCKET );
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253 /* Set a time out so a missing reply does not cause the task to block
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255 FreeRTOS_setsockopt( xSocket, 0, FREERTOS_SO_RCVTIMEO, &xReceiveTimeOut, sizeof( xReceiveTimeOut ) );
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257 /* Send a number of echo requests. */
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258 for( lLoopCount = 0; lLoopCount < lMaxLoopCount; lLoopCount++ )
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260 /* This task is going to send using the zero copy interface. The
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261 data being sent is therefore written directly into a buffer that is
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262 passed by reference into the FreeRTOS_sendto() function. First
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263 obtain a buffer of adequate size from the IP stack. Although a max
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264 delay is used, the actual delay will be capped to
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265 ipconfigMAX_SEND_BLOCK_TIME_TICKS, hence the test to ensure a buffer
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266 was actually obtained. */
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267 pucUDPPayloadBuffer = ( uint8_t * ) FreeRTOS_GetUDPPayloadBuffer( xBufferLength, portMAX_DELAY );
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269 if( pucUDPPayloadBuffer != NULL )
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271 /* A buffer was successfully obtained. Create the string that is
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272 sent to the echo server. Note the string is written directly
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273 into the buffer obtained from the IP stack. */
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274 sprintf( ( char * ) pucUDPPayloadBuffer, "%s %u\r\n", "Zero copy message number", ( unsigned int ) ulTxCount );
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276 /* Also copy the string into a local buffer so it can be compared
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277 with the string that is later received back from the echo server. */
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278 strcpy( cTxString, ( char * ) pucUDPPayloadBuffer );
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280 /* Pass the buffer into the send function. ulFlags has the
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281 FREERTOS_ZERO_COPY bit set so the IP stack will take control of
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282 the buffer, rather than copy data out of the buffer. */
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283 echoMARK_SEND_IN_TRACE_BUFFER( xZeroCopySendEvent );
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284 lReturned = FreeRTOS_sendto( xSocket, /* The socket being sent to. */
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285 ( void * ) pucUDPPayloadBuffer, /* The buffer being passed into the IP stack. */
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286 strlen( cTxString ) + 1, /* The length of the data being sent. Plus 1 to ensure the null terminator is part of the data. */
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287 FREERTOS_ZERO_COPY, /* ulFlags with the zero copy bit is set. */
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288 &xEchoServerAddress, /* Where the data is being sent. */
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289 sizeof( xEchoServerAddress ) );
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291 if( lReturned == 0 )
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293 /* The send operation failed, so this task is still
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294 responsible for the buffer obtained from the IP stack. To
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295 ensure the buffer is not lost it must either be used again,
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296 or, as in this case, returned to the IP stack using
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297 FreeRTOS_ReleaseUDPPayloadBuffer(). pucUDPPayloadBuffer can
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298 be safely re-used to receive from the socket below once the
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299 buffer has been returned to the stack. */
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300 FreeRTOS_ReleaseUDPPayloadBuffer( ( void * ) pucUDPPayloadBuffer );
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304 /* The send was successful so the IP stack is now managing
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305 the buffer pointed to by pucUDPPayloadBuffer, and the IP
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306 stack will return the buffer once it has been sent.
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307 pucUDPPayloadBuffer can be safely re-used to receive from
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308 the socket below. */
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311 /* Keep a count of how many echo requests have been transmitted
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312 so it can be compared to the number of echo replies received.
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313 It would be expected to loose at least one to an ARP message the
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314 first time the connection is created. */
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317 /* Receive data on the socket. ulFlags has the zero copy bit set
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318 (FREERTOS_ZERO_COPY) indicating to the stack that a reference to
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319 the received data should be passed out to this task using the
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320 second parameter to the FreeRTOS_recvfrom() call. When this is
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321 done the IP stack is no longer responsible for releasing the
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322 buffer, and the task *must* return the buffer to the stack when
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323 it is no longer needed. By default the receive block time is
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325 echoMARK_SEND_IN_TRACE_BUFFER( xZeroCopyReceiveEvent );
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326 lReturned = FreeRTOS_recvfrom( xSocket, /* The socket to receive from. */
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327 ( void * ) &pucUDPPayloadBuffer, /* pucUDPPayloadBuffer will be set to point to the buffer that already contains the received data. */
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328 0, /* Ignored because the zero copy interface is being used. */
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329 FREERTOS_ZERO_COPY, /* ulFlags with the FREERTOS_ZERO_COPY bit set. */
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330 &xEchoServerAddress, /* The address from which the data was sent. */
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333 if( lReturned > 0 )
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335 /* Compare the string sent to the echo server with the string
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336 received back from the echo server. */
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337 if( strcmp( ( char * ) pucUDPPayloadBuffer, cTxString ) == 0 )
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339 /* The strings matched. */
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343 /* The buffer that contains the data passed out of the stack
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344 *must* be returned to the stack. */
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345 FreeRTOS_ReleaseUDPPayloadBuffer( pucUDPPayloadBuffer );
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350 /* Pause for a short while to ensure the network is not too
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352 vTaskDelay( echoLOOP_DELAY );
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354 /* Close this socket before looping back to create another. */
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355 FreeRTOS_closesocket( xSocket );
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358 /*-----------------------------------------------------------*/
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