2 * FreeRTOS+UDP V1.0.4 (C) 2014 Real Time Engineers ltd.
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3 * All rights reserved
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5 * This file is part of the FreeRTOS+UDP distribution. The FreeRTOS+UDP license
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6 * terms are different to the FreeRTOS license terms.
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8 * FreeRTOS+UDP uses a dual license model that allows the software to be used
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9 * under a pure GPL open source license (as opposed to the modified GPL license
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10 * under which FreeRTOS is distributed) or a commercial license. Details of
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11 * both license options follow:
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13 * - Open source licensing -
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14 * FreeRTOS+UDP is a free download and may be used, modified, evaluated and
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15 * distributed without charge provided the user adheres to version two of the
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16 * GNU General Public License (GPL) and does not remove the copyright notice or
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17 * this text. The GPL V2 text is available on the gnu.org web site, and on the
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18 * following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
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20 * - Commercial licensing -
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21 * Businesses and individuals that for commercial or other reasons cannot comply
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22 * with the terms of the GPL V2 license must obtain a commercial license before
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23 * incorporating FreeRTOS+UDP into proprietary software for distribution in any
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24 * form. Commercial licenses can be purchased from http://shop.freertos.org/udp
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25 * and do not require any source files to be changed.
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27 * FreeRTOS+UDP is distributed in the hope that it will be useful. You cannot
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28 * use FreeRTOS+UDP unless you agree that you use the software 'as is'.
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29 * FreeRTOS+UDP is provided WITHOUT ANY WARRANTY; without even the implied
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30 * warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR
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31 * PURPOSE. Real Time Engineers Ltd. disclaims all conditions and terms, be they
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32 * implied, expressed, or statutory.
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34 * 1 tab == 4 spaces!
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36 * http://www.FreeRTOS.org
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37 * http://www.FreeRTOS.org/udp
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41 /* Standard includes. */
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45 /* FreeRTOS includes. */
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46 #include "FreeRTOS.h"
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51 /* FreeRTOS+UDP includes. */
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52 #include "FreeRTOS_UDP_IP.h"
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53 #include "FreeRTOS_IP_Private.h"
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54 #include "FreeRTOS_Sockets.h"
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55 #include "NetworkBufferManagement.h"
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57 /* Demo includes. */
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58 #include "NetworkInterface.h"
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60 /* If a packet cannot be sent immediately then the task performing the send
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61 operation will be held in the Blocked state (so other tasks can execute) for
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62 niTX_BUFFER_FREE_WAIT ticks. It will do this a maximum of niMAX_TX_ATTEMPTS
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63 before giving up. */
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64 #define niTX_BUFFER_FREE_WAIT ( ( TickType_t ) 2UL / portTICK_RATE_MS )
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65 #define niMAX_TX_ATTEMPTS ( 5 )
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67 /*-----------------------------------------------------------*/
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70 * A deferred interrupt handler task that processes received frames.
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72 static void prvGMACDeferredInterruptHandlerTask( void *pvParameters );
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75 * Called by the ASF GMAC driver when a packet is received.
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77 static void prvGMACRxCallback( uint32_t ulStatus );
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79 /*-----------------------------------------------------------*/
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81 /* The queue used to communicate Ethernet events to the IP task. */
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82 extern xQueueHandle xNetworkEventQueue;
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84 /* The GMAC driver instance. */
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85 static gmac_device_t xGMACStruct;
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87 /* Handle of the task used to process MAC events. */
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88 static TaskHandle_t xMACEventHandlingTask = NULL;
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90 /*-----------------------------------------------------------*/
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92 BaseType_t xNetworkInterfaceInitialise( void )
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94 gmac_options_t xGMACOptions;
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95 extern uint8_t ucMACAddress[ 6 ];
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96 const TickType_t xPHYDelay_400ms = 400UL;
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97 BaseType_t xReturn = pdFALSE;
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99 /* Ensure PHY is ready. */
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100 vTaskDelay( xPHYDelay_400ms / portTICK_RATE_MS );
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102 /* Enable GMAC clock. */
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103 pmc_enable_periph_clk( ID_GMAC );
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105 /* Fill in GMAC options */
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106 xGMACOptions.uc_copy_all_frame = 0;
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107 xGMACOptions.uc_no_boardcast = 0;
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108 memcpy( xGMACOptions.uc_mac_addr, ucMACAddress, sizeof( ucMACAddress ) );
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110 xGMACStruct.p_hw = GMAC;
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112 /* Init GMAC driver structure. */
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113 gmac_dev_init( GMAC, &xGMACStruct, &xGMACOptions );
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115 /* Init MAC PHY driver. */
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116 if( ethernet_phy_init( GMAC, BOARD_GMAC_PHY_ADDR, sysclk_get_cpu_hz() ) == GMAC_OK )
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118 /* Auto Negotiate, work in RMII mode. */
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119 if( ethernet_phy_auto_negotiate( GMAC, BOARD_GMAC_PHY_ADDR ) == GMAC_OK )
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121 /* Establish Ethernet link. */
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122 vTaskDelay( xPHYDelay_400ms * 2UL );
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123 if( ethernet_phy_set_link( GMAC, BOARD_GMAC_PHY_ADDR, 1 ) == GMAC_OK )
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125 /* Register the callbacks. */
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126 gmac_dev_set_rx_callback( &xGMACStruct, prvGMACRxCallback );
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128 /* The Rx deferred interrupt handler task is created at the
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129 highest possible priority to ensure the interrupt handler can
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130 return directly to it no matter which task was running when the
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131 interrupt occurred. */
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132 xTaskCreate( prvGMACDeferredInterruptHandlerTask,/* The function that implements the task. */
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134 configMINIMAL_STACK_SIZE, /* Stack allocated to the task (defined in words, not bytes). */
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135 NULL, /* The task parameter is not used. */
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136 configMAX_PRIORITIES - 1, /* The priority assigned to the task. */
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137 &xMACEventHandlingTask ); /* The handle is stored so the ISR knows which task to notify. */
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139 /* Enable the interrupt and set its priority as configured.
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140 THIS DRIVER REQUIRES configMAC_INTERRUPT_PRIORITY TO BE DEFINED,
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141 PREFERABLY IN FreeRTOSConfig.h. */
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142 NVIC_SetPriority( GMAC_IRQn, configMAC_INTERRUPT_PRIORITY );
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143 NVIC_EnableIRQ( GMAC_IRQn );
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151 /*-----------------------------------------------------------*/
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153 static void prvGMACRxCallback( uint32_t ulStatus )
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155 BaseType_t xHigherPriorityTaskWoken = pdFALSE;
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157 configASSERT( xMACEventHandlingTask );
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159 /* Unblock the deferred interrupt handler task if the event was an Rx. */
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160 if( ulStatus == GMAC_RSR_REC )
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162 xTaskNotifyGiveFromISR( xMACEventHandlingTask, &xHigherPriorityTaskWoken );
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165 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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167 /*-----------------------------------------------------------*/
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169 BaseType_t xNetworkInterfaceOutput( xNetworkBufferDescriptor_t * const pxNetworkBuffer )
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171 BaseType_t xReturn = pdFAIL;
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174 /* Attempt to obtain access to a Tx descriptor. */
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175 for( x = 0; x < niMAX_TX_ATTEMPTS; x++ )
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177 if( gmac_dev_write( &xGMACStruct, pxNetworkBuffer->pucEthernetBuffer, ( uint32_t ) pxNetworkBuffer->xDataLength, NULL ) == GMAC_OK )
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179 /* The Tx has been initiated. */
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185 iptraceWAITING_FOR_TX_DMA_DESCRIPTOR();
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186 vTaskDelay( niTX_BUFFER_FREE_WAIT );
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190 /* Finished with the network buffer. */
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191 vNetworkBufferRelease( pxNetworkBuffer );
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195 /*-----------------------------------------------------------*/
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197 void GMAC_Handler( void )
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199 gmac_handler( &xGMACStruct );
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201 /*-----------------------------------------------------------*/
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203 static void prvGMACDeferredInterruptHandlerTask( void *pvParameters )
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205 xNetworkBufferDescriptor_t *pxNetworkBuffer;
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206 xIPStackEvent_t xRxEvent = { eEthernetRxEvent, NULL };
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207 static const TickType_t xBufferWaitDelay = 1500UL / portTICK_RATE_MS;
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208 uint32_t ulReturned;
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210 /* This is a very simply but also inefficient implementation. */
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212 ( void ) pvParameters;
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216 /* Wait for the GMAC interrupt to indicate that another packet has been
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217 received. The while() loop is only needed if INCLUDE_vTaskSuspend is
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218 set to 0 in FreeRTOSConfig.h. If INCLUDE_vTaskSuspend is set to 1
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219 then portMAX_DELAY would be an indefinite block time and
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220 xTaskNotifyTake() would only return when the task was actually
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222 while( ulTaskNotifyTake( pdFALSE, portMAX_DELAY ) == 0 );
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224 /* Allocate a buffer to hold the data. */
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225 pxNetworkBuffer = pxNetworkBufferGet( ipTOTAL_ETHERNET_FRAME_SIZE, xBufferWaitDelay );
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227 if( pxNetworkBuffer != NULL )
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229 /* At least one packet has been received. */
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230 ulReturned = gmac_dev_read( &xGMACStruct, pxNetworkBuffer->pucEthernetBuffer, ipTOTAL_ETHERNET_FRAME_SIZE, ( uint32_t * ) &( pxNetworkBuffer->xDataLength ) );
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231 if( ulReturned == GMAC_OK )
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233 #if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES == 1
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235 if( pxNetworkBuffer->xDataLength > 0 )
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237 /* If the frame would not be processed by the IP stack then
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238 don't even bother sending it to the IP stack. */
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239 if( eConsiderFrameForProcessing( pxNetworkBuffer->pucEthernetBuffer ) != eProcessBuffer )
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241 pxNetworkBuffer->xDataLength = 0;
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247 if( pxNetworkBuffer->xDataLength > 0 )
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249 /* Store a pointer to the network buffer structure in the
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250 padding space that was left in front of the Ethernet frame.
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251 The pointer is needed to ensure the network buffer structure
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252 can be located when it is time for it to be freed if the
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253 Ethernet frame gets used as a zero copy buffer. */
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254 *( ( xNetworkBufferDescriptor_t ** ) ( ( pxNetworkBuffer->pucEthernetBuffer - ipBUFFER_PADDING ) ) ) = pxNetworkBuffer;
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256 /* Data was received and stored. Send it to the IP task
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258 xRxEvent.pvData = ( void * ) pxNetworkBuffer;
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259 if( xQueueSendToBack( xNetworkEventQueue, &xRxEvent, ( TickType_t ) 0 ) == pdFALSE )
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261 /* The buffer could not be sent to the IP task so the
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262 buffer must be released. */
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263 vNetworkBufferRelease( pxNetworkBuffer );
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264 iptraceETHERNET_RX_EVENT_LOST();
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268 iptraceNETWORK_INTERFACE_RECEIVE();
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273 /* The buffer does not contain any data so there is no
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274 point sending it to the IP task. Just release it. */
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275 vNetworkBufferRelease( pxNetworkBuffer );
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276 iptraceETHERNET_RX_EVENT_LOST();
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281 vNetworkBufferRelease( pxNetworkBuffer );
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282 iptraceETHERNET_RX_EVENT_LOST();
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287 /* Left a frame in the driver as a buffer was not available. */
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288 gmac_dev_reset( &xGMACStruct );
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292 /*-----------------------------------------------------------*/
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