2 FreeRTOS V7.5.1 - 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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65 /* Kernel includes. */
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66 #include "FreeRTOS.h"
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70 /* Demo includes. */
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76 /* Hardware library includes. */
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77 #include "hw_types.h"
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78 #include "hw_memmap.h"
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79 #include "hw_ints.h"
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80 #include "hw_ethernet.h"
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81 #include "ethernet.h"
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82 #include "interrupt.h"
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84 #define emacNUM_RX_BUFFERS 5
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85 #define emacFRAM_SIZE_BYTES 2
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86 #define macNEGOTIATE_DELAY 2000
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87 #define macWAIT_SEND_TIME ( 10 )
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89 /* The task that handles the MAC peripheral. This is created at a high
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90 priority and is effectively a deferred interrupt handler. The peripheral
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91 handling is deferred to a task to prevent the entire FIFO having to be read
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92 from within an ISR. */
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93 void vMACHandleTask( void *pvParameters );
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95 /*-----------------------------------------------------------*/
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97 /* The semaphore used to wake the uIP task when data arrives. */
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98 xSemaphoreHandle xEMACSemaphore = NULL;
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100 /* The semaphore used to wake the interrupt handler task. The peripheral
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101 is processed at the task level to prevent the need to read the entire FIFO from
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102 within the ISR itself. */
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103 xSemaphoreHandle xMACInterruptSemaphore = NULL;
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105 /* The buffer used by the uIP stack. In this case the pointer is used to
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106 point to one of the Rx buffers. */
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107 unsigned portCHAR *uip_buf;
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109 /* Buffers into which Rx data is placed. */
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110 static unsigned portCHAR ucRxBuffers[ emacNUM_RX_BUFFERS ][ UIP_BUFSIZE + ( 4 * emacFRAM_SIZE_BYTES ) ];
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112 /* The length of the data within each of the Rx buffers. */
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113 static unsigned portLONG ulRxLength[ emacNUM_RX_BUFFERS ];
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115 /* Used to keep a track of the number of bytes to transmit. */
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116 static unsigned portLONG ulNextTxSpace;
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118 /*-----------------------------------------------------------*/
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120 portBASE_TYPE vInitEMAC( void )
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122 unsigned long ulTemp;
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123 portBASE_TYPE xReturn;
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125 /* Ensure all interrupts are disabled. */
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126 EthernetIntDisable( ETH_BASE, ( ETH_INT_PHY | ETH_INT_MDIO | ETH_INT_RXER | ETH_INT_RXOF | ETH_INT_TX | ETH_INT_TXER | ETH_INT_RX));
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128 /* Clear any interrupts that were already pending. */
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129 ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE );
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130 EthernetIntClear( ETH_BASE, ulTemp );
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132 /* Initialise the MAC and connect. */
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133 EthernetInit( ETH_BASE );
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134 EthernetConfigSet( ETH_BASE, ( ETH_CFG_TX_DPLXEN | ETH_CFG_TX_CRCEN | ETH_CFG_TX_PADEN ) );
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135 EthernetEnable( ETH_BASE );
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137 /* Mark each Rx buffer as empty. */
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138 for( ulTemp = 0; ulTemp < emacNUM_RX_BUFFERS; ulTemp++ )
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140 ulRxLength[ ulTemp ] = 0;
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143 /* Create the queue and task used to defer the MAC processing to the
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145 vSemaphoreCreateBinary( xMACInterruptSemaphore );
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146 xSemaphoreTake( xMACInterruptSemaphore, 0 );
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147 xReturn = xTaskCreate( vMACHandleTask, ( signed portCHAR * ) "MAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
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148 vTaskDelay( macNEGOTIATE_DELAY );
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150 /* We are only interested in Rx interrupts. */
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151 IntPrioritySet( INT_ETH, configKERNEL_INTERRUPT_PRIORITY );
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152 IntEnable( INT_ETH );
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153 EthernetIntEnable(ETH_BASE, ETH_INT_RX);
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157 /*-----------------------------------------------------------*/
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159 unsigned int uiGetEMACRxData( unsigned char *ucBuffer )
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161 static unsigned long ulNextRxBuffer = 0;
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164 iLen = ulRxLength[ ulNextRxBuffer ];
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168 /* Leave room for the size at the start of the buffer. */
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169 uip_buf = &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
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171 ulRxLength[ ulNextRxBuffer ] = 0;
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174 if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
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176 ulNextRxBuffer = 0;
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182 /*-----------------------------------------------------------*/
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184 void vInitialiseSend( void )
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186 /* Set the index to the first byte to send - skipping over the size
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190 /*-----------------------------------------------------------*/
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192 void vIncrementTxLength( unsigned portLONG ulLength )
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194 ulNextTxSpace += ulLength;
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196 /*-----------------------------------------------------------*/
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198 void vSendBufferToMAC( void )
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200 unsigned long *pulSource;
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201 unsigned portSHORT * pus;
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202 unsigned portLONG ulNextWord;
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204 /* Locate the data to be send. */
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205 pus = ( unsigned portSHORT * ) uip_buf;
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207 /* Add in the size of the data. */
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209 *pus = ulNextTxSpace;
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211 /* Wait for data to be sent if there is no space immediately. */
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212 while( !EthernetSpaceAvail( ETH_BASE ) )
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214 vTaskDelay( macWAIT_SEND_TIME );
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217 pulSource = ( unsigned portLONG * ) pus;
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219 for( ulNextWord = 0; ulNextWord < ulNextTxSpace; ulNextWord += sizeof( unsigned portLONG ) )
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221 HWREG(ETH_BASE + MAC_O_DATA) = *pulSource;
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226 HWREG( ETH_BASE + MAC_O_TR ) = MAC_TR_NEWTX;
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228 /*-----------------------------------------------------------*/
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230 void vEMAC_ISR( void )
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232 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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233 unsigned portLONG ulTemp;
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235 /* Clear the interrupt. */
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236 ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE );
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237 EthernetIntClear( ETH_BASE, ulTemp );
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239 /* Was it an Rx interrupt? */
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240 if( ulTemp & ETH_INT_RX )
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242 xSemaphoreGiveFromISR( xMACInterruptSemaphore, &xHigherPriorityTaskWoken );
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243 EthernetIntDisable( ETH_BASE, ETH_INT_RX );
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246 /* Switch to the uIP task. */
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247 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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249 /*-----------------------------------------------------------*/
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251 void vMACHandleTask( void *pvParameters )
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253 unsigned long ulLen = 0, i;
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254 unsigned portLONG ulLength, ulInt;
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255 unsigned long *pulBuffer;
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256 static unsigned portLONG ulNextRxBuffer = 0;
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257 portBASE_TYPE xSwitchRequired = pdFALSE;
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261 /* Wait for something to do. */
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262 xSemaphoreTake( xMACInterruptSemaphore, portMAX_DELAY );
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264 while( ( ulInt = ( EthernetIntStatus( ETH_BASE, pdFALSE ) & ETH_INT_RX ) ) != 0 )
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266 ulLength = HWREG( ETH_BASE + MAC_O_DATA );
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268 /* Leave room at the start of the buffer for the size. */
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269 pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
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270 *pulBuffer = ( ulLength >> 16 );
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272 /* Get the size of the data. */
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273 pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 4 ] );
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274 ulLength &= 0xFFFF;
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280 if( ulLength >= UIP_BUFSIZE )
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282 /* The data won't fit in our buffer. Ensure we don't
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283 try to write into the buffer. */
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287 /* Read out the data into our buffer. */
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288 for( i = 0; i < ulLength; i += sizeof( unsigned portLONG ) )
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290 *pulBuffer = HWREG( ETH_BASE + MAC_O_DATA );
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294 /* Store the length of the data into the separate array. */
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295 ulRxLength[ ulNextRxBuffer ] = ulLength;
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297 /* Use the next buffer the next time through. */
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299 if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
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301 ulNextRxBuffer = 0;
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304 /* Ensure the uIP task is not blocked as data has arrived. */
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305 xSemaphoreGive( xEMACSemaphore );
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309 EthernetIntEnable( ETH_BASE, ETH_INT_RX );
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