2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License (version 2) as published by the
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8 Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS without being obliged to provide the
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11 source code for proprietary components outside of the FreeRTOS kernel.
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12 Alternative commercial license and support terms are also available upon
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13 request. See the licensing section of http://www.FreeRTOS.org for full
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16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 You should have received a copy of the GNU General Public License along
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22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ***************************************************************************
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28 * The FreeRTOS eBook and reference manual are available to purchase for a *
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29 * small fee. Help yourself get started quickly while also helping the *
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30 * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
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32 ***************************************************************************
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36 Please ensure to read the configuration and relevant port sections of the
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37 online documentation.
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39 http://www.FreeRTOS.org - Documentation, latest information, license and
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42 http://www.SafeRTOS.com - A version that is certified for use in safety
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45 http://www.OpenRTOS.com - Commercial support, development, porting,
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46 licensing and training services.
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49 /* Kernel includes. */
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50 #include "FreeRTOS.h"
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54 /* Demo includes. */
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60 /* Hardware library includes. */
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61 #include "hw_types.h"
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62 #include "hw_memmap.h"
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63 #include "hw_ints.h"
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64 #include "hw_ethernet.h"
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65 #include "ethernet.h"
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66 #include "interrupt.h"
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68 #define emacNUM_RX_BUFFERS 5
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69 #define emacFRAM_SIZE_BYTES 2
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70 #define macNEGOTIATE_DELAY 2000
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71 #define macWAIT_SEND_TIME ( 10 )
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73 /* The task that handles the MAC peripheral. This is created at a high
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74 priority and is effectively a deferred interrupt handler. The peripheral
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75 handling is deferred to a task to prevent the entire FIFO having to be read
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76 from within an ISR. */
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77 void vMACHandleTask( void *pvParameters );
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79 /*-----------------------------------------------------------*/
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81 /* The semaphore used to wake the uIP task when data arrives. */
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82 xSemaphoreHandle xEMACSemaphore = NULL;
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84 /* The semaphore used to wake the interrupt handler task. The peripheral
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85 is processed at the task level to prevent the need to read the entire FIFO from
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86 within the ISR itself. */
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87 xSemaphoreHandle xMACInterruptSemaphore = NULL;
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89 /* The buffer used by the uIP stack. In this case the pointer is used to
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90 point to one of the Rx buffers. */
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91 unsigned portCHAR *uip_buf;
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93 /* Buffers into which Rx data is placed. */
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94 static unsigned portCHAR ucRxBuffers[ emacNUM_RX_BUFFERS ][ UIP_BUFSIZE + ( 4 * emacFRAM_SIZE_BYTES ) ];
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96 /* The length of the data within each of the Rx buffers. */
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97 static unsigned portLONG ulRxLength[ emacNUM_RX_BUFFERS ];
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99 /* Used to keep a track of the number of bytes to transmit. */
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100 static unsigned portLONG ulNextTxSpace;
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102 /*-----------------------------------------------------------*/
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104 portBASE_TYPE vInitEMAC( void )
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106 unsigned long ulTemp;
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107 portBASE_TYPE xReturn;
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109 /* Ensure all interrupts are disabled. */
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110 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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112 /* Clear any interrupts that were already pending. */
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113 ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE );
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114 EthernetIntClear( ETH_BASE, ulTemp );
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116 /* Initialise the MAC and connect. */
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117 EthernetInit( ETH_BASE );
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118 EthernetConfigSet( ETH_BASE, ( ETH_CFG_TX_DPLXEN | ETH_CFG_TX_CRCEN | ETH_CFG_TX_PADEN ) );
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119 EthernetEnable( ETH_BASE );
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121 /* Mark each Rx buffer as empty. */
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122 for( ulTemp = 0; ulTemp < emacNUM_RX_BUFFERS; ulTemp++ )
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124 ulRxLength[ ulTemp ] = 0;
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127 /* Create the queue and task used to defer the MAC processing to the
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129 vSemaphoreCreateBinary( xMACInterruptSemaphore );
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130 xSemaphoreTake( xMACInterruptSemaphore, 0 );
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131 xReturn = xTaskCreate( vMACHandleTask, ( signed portCHAR * ) "MAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
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132 vTaskDelay( macNEGOTIATE_DELAY );
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134 /* We are only interested in Rx interrupts. */
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135 IntPrioritySet( INT_ETH, configKERNEL_INTERRUPT_PRIORITY );
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136 IntEnable( INT_ETH );
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137 EthernetIntEnable(ETH_BASE, ETH_INT_RX);
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141 /*-----------------------------------------------------------*/
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143 unsigned int uiGetEMACRxData( unsigned char *ucBuffer )
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145 static unsigned long ulNextRxBuffer = 0;
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148 iLen = ulRxLength[ ulNextRxBuffer ];
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152 /* Leave room for the size at the start of the buffer. */
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153 uip_buf = &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
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155 ulRxLength[ ulNextRxBuffer ] = 0;
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158 if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
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160 ulNextRxBuffer = 0;
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166 /*-----------------------------------------------------------*/
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168 void vInitialiseSend( void )
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170 /* Set the index to the first byte to send - skipping over the size
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174 /*-----------------------------------------------------------*/
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176 void vIncrementTxLength( unsigned portLONG ulLength )
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178 ulNextTxSpace += ulLength;
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180 /*-----------------------------------------------------------*/
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182 void vSendBufferToMAC( void )
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184 unsigned long *pulSource;
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185 unsigned portSHORT * pus;
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186 unsigned portLONG ulNextWord;
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188 /* Locate the data to be send. */
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189 pus = ( unsigned portSHORT * ) uip_buf;
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191 /* Add in the size of the data. */
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193 *pus = ulNextTxSpace;
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195 /* Wait for data to be sent if there is no space immediately. */
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196 while( !EthernetSpaceAvail( ETH_BASE ) )
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198 vTaskDelay( macWAIT_SEND_TIME );
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201 pulSource = ( unsigned portLONG * ) pus;
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203 for( ulNextWord = 0; ulNextWord < ulNextTxSpace; ulNextWord += sizeof( unsigned portLONG ) )
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205 HWREG(ETH_BASE + MAC_O_DATA) = *pulSource;
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210 HWREG( ETH_BASE + MAC_O_TR ) = MAC_TR_NEWTX;
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212 /*-----------------------------------------------------------*/
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214 void vEMAC_ISR( void )
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216 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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217 unsigned portLONG ulTemp;
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219 /* Clear the interrupt. */
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220 ulTemp = EthernetIntStatus( ETH_BASE, pdFALSE );
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221 EthernetIntClear( ETH_BASE, ulTemp );
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223 /* Was it an Rx interrupt? */
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224 if( ulTemp & ETH_INT_RX )
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226 xSemaphoreGiveFromISR( xMACInterruptSemaphore, &xHigherPriorityTaskWoken );
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227 EthernetIntDisable( ETH_BASE, ETH_INT_RX );
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230 /* Switch to the uIP task. */
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231 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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233 /*-----------------------------------------------------------*/
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235 void vMACHandleTask( void *pvParameters )
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237 unsigned long ulLen = 0, i;
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238 unsigned portLONG ulLength, ulInt;
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239 unsigned long *pulBuffer;
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240 static unsigned portLONG ulNextRxBuffer = 0;
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241 portBASE_TYPE xSwitchRequired = pdFALSE;
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245 /* Wait for something to do. */
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246 xSemaphoreTake( xMACInterruptSemaphore, portMAX_DELAY );
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248 while( ( ulInt = ( EthernetIntStatus( ETH_BASE, pdFALSE ) & ETH_INT_RX ) ) != 0 )
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250 ulLength = HWREG( ETH_BASE + MAC_O_DATA );
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252 /* Leave room at the start of the buffer for the size. */
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253 pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
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254 *pulBuffer = ( ulLength >> 16 );
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256 /* Get the size of the data. */
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257 pulBuffer = ( unsigned long * ) &( ucRxBuffers[ ulNextRxBuffer ][ 4 ] );
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258 ulLength &= 0xFFFF;
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264 if( ulLength >= UIP_BUFSIZE )
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266 /* The data won't fit in our buffer. Ensure we don't
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267 try to write into the buffer. */
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271 /* Read out the data into our buffer. */
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272 for( i = 0; i < ulLength; i += sizeof( unsigned portLONG ) )
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274 *pulBuffer = HWREG( ETH_BASE + MAC_O_DATA );
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278 /* Store the length of the data into the separate array. */
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279 ulRxLength[ ulNextRxBuffer ] = ulLength;
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281 /* Use the next buffer the next time through. */
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283 if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
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285 ulNextRxBuffer = 0;
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288 /* Ensure the uIP task is not blocked as data has arrived. */
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289 xSemaphoreGive( xEMACSemaphore );
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293 EthernetIntEnable( ETH_BASE, ETH_INT_RX );
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