2 * FreeRTOS+UDP V1.0.3 (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 standard GPL open source license, or a commercial license. The
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10 * standard GPL license (unlike the modified GPL license under which FreeRTOS
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11 * itself is distributed) requires that all software statically linked with
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12 * FreeRTOS+UDP is also distributed under the same GPL V2 license terms.
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13 * Details of both license options follow:
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15 * - Open source licensing -
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16 * FreeRTOS+UDP is a free download and may be used, modified, evaluated and
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17 * distributed without charge provided the user adheres to version two of the
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18 * GNU General Public License (GPL) and does not remove the copyright notice or
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19 * this text. The GPL V2 text is available on the gnu.org web site, and on the
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20 * following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
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22 * - Commercial licensing -
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23 * Businesses and individuals that for commercial or other reasons cannot comply
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24 * with the terms of the GPL V2 license must obtain a commercial license before
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25 * incorporating FreeRTOS+UDP into proprietary software for distribution in any
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26 * form. Commercial licenses can be purchased from http://shop.freertos.org/udp
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27 * and do not require any source files to be changed.
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29 * FreeRTOS+UDP is distributed in the hope that it will be useful. You cannot
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30 * use FreeRTOS+UDP unless you agree that you use the software 'as is'.
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31 * FreeRTOS+UDP is provided WITHOUT ANY WARRANTY; without even the implied
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32 * warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR
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33 * PURPOSE. Real Time Engineers Ltd. disclaims all conditions and terms, be they
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34 * implied, expressed, or statutory.
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36 * 1 tab == 4 spaces!
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38 * http://www.FreeRTOS.org
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39 * http://www.FreeRTOS.org/udp
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43 /* FreeRTOS includes. */
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44 #include "FreeRTOS.h"
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48 /* FreeRTOS+UDP includes. */
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49 #include "FreeRTOS_UDP_IP.h"
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50 #include "FreeRTOS_IP_Private.h"
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51 #include "NetworkBufferManagement.h"
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53 /* Library includes. */
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56 /* Descriptors that reference received buffers are expected to have both the
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57 first and last frame bits set because buffers are dimensioned to hold complete
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59 #define emacEXPECTED_RX_STATUS_MASK ( RDES_LS | RDES_FS )
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61 /*-----------------------------------------------------------*/
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64 * Set the Rx and Tx descriptors into their expected initial state.
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66 static void prvResetRxDescriptors( void );
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67 static void prvResetTxDescriptors( void );
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70 * Returns the length of the data pointed to by the next Rx descriptor.
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72 static uint32_t prvReceivedDataLength( void );
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75 /*-----------------------------------------------------------*/
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77 /* Rx and Tx descriptors and data array. */
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78 static volatile IP_ENET_001_ENHRXDESC_T xRXDescriptors[ configNUM_RX_ETHERNET_DMA_DESCRIPTORS ];
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79 static volatile IP_ENET_001_ENHTXDESC_T xTxDescriptors[ configNUM_TX_ETHERNET_DMA_DESCRIPTORS ];
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81 /* Indexes into the Rx and Tx descriptor arrays. */
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82 static unsigned int xRxDescriptorIndex = 0;
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83 static unsigned int xTxDescriptorIndex = 0;
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85 /*-----------------------------------------------------------*/
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87 BaseType_t xEMACInit( uint8_t ucMACAddress[ 6 ] )
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90 uint32_t ulPHYStatus;
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92 /* Configure the hardware. */
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93 Chip_ENET_Init( LPC_ETHERNET );
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95 if( lpc_phy_init( pdTRUE, vTaskDelay ) == SUCCESS )
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97 /* The MAC address is passed in as the function parameter. */
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98 Chip_ENET_SetADDR( LPC_ETHERNET, ucMACAddress );
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100 /* Wait for autonegotiation to complete. */
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104 ulPHYStatus = lpcPHYStsPoll();
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105 } while( ( ulPHYStatus & PHY_LINK_CONNECTED ) == 0x00 );
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107 /* Configure the hardware as per the negotiated link. */
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108 if( ( ulPHYStatus & PHY_LINK_FULLDUPLX ) == PHY_LINK_FULLDUPLX )
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110 IP_ENET_SetDuplex( LPC_ETHERNET, pdTRUE );
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114 IP_ENET_SetDuplex( LPC_ETHERNET, pdFALSE );
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117 if( ( ulPHYStatus & PHY_LINK_SPEED100 ) == PHY_LINK_SPEED100 )
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119 IP_ENET_SetSpeed( LPC_ETHERNET, pdTRUE );
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123 IP_ENET_SetSpeed( LPC_ETHERNET, pdFALSE );
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126 /* Set descriptors to their initial state. */
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127 prvResetRxDescriptors();
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128 prvResetTxDescriptors();
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130 /* Enable RX and TX. */
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131 Chip_ENET_TXEnable( LPC_ETHERNET );
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132 Chip_ENET_RXEnable( LPC_ETHERNET );
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134 /* Enable the interrupt and set its priority as configured. THIS
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135 DRIVER REQUIRES configMAC_INTERRUPT_PRIORITY TO BE DEFINED, PREFERABLY
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136 IN FreeRTOSConfig.h. */
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137 NVIC_SetPriority( ETHERNET_IRQn, configMAC_INTERRUPT_PRIORITY );
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138 NVIC_EnableIRQ( ETHERNET_IRQn );
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140 /* Enable interrupts. */
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141 LPC_ETHERNET->DMA_INT_EN = DMA_IE_NIE | DMA_IE_RIE;
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152 /*-----------------------------------------------------------*/
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154 BaseType_t xEMACIsTxDescriptorAvailable( void )
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156 BaseType_t xReturn;
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158 if( ( xTxDescriptors[ xTxDescriptorIndex ].CTRLSTAT & RDES_OWN ) == 0 )
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169 /*-----------------------------------------------------------*/
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171 void vEMACAssignBufferToDescriptor( uint8_t * pucBuffer )
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173 /* The old packet is now finished with and can be freed. */
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174 vEthernetBufferRelease( ( void * ) xTxDescriptors[ xTxDescriptorIndex ].B1ADD );
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176 /* Assign the new packet to the descriptor. */
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177 xTxDescriptors[ xTxDescriptorIndex ].B1ADD = ( uint32_t ) pucBuffer;
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179 /*-----------------------------------------------------------*/
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181 void vEMACStartNextTransmission( uint32_t ulLength )
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183 xTxDescriptors[ xTxDescriptorIndex ].BSIZE = ulLength;
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184 xTxDescriptors[ xTxDescriptorIndex ].CTRLSTAT |= RDES_OWN;
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186 /* Wake Up the DMA if it's in Suspended Mode. */
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187 LPC_ETHERNET->DMA_TRANS_POLL_DEMAND = 1;
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188 xTxDescriptorIndex++;
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190 if( xTxDescriptorIndex == configNUM_TX_ETHERNET_DMA_DESCRIPTORS )
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192 xTxDescriptorIndex = 0;
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195 /*-----------------------------------------------------------*/
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197 static uint32_t prvReceivedDataLength( void )
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199 unsigned short RxLen = 0;
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201 RxLen = ( xRXDescriptors[ xRxDescriptorIndex ].STATUS >> 16 ) & 0x03FFF;
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204 /*-----------------------------------------------------------*/
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206 void vEMACReturnRxDescriptor( void )
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208 xRXDescriptors[ xRxDescriptorIndex ].STATUS = RDES_OWN;
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209 xRxDescriptorIndex++;
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211 if( xRxDescriptorIndex == configNUM_RX_ETHERNET_DMA_DESCRIPTORS )
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213 xRxDescriptorIndex = 0;
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216 /*-----------------------------------------------------------*/
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218 BaseType_t xEMACRxDataAvailable( void )
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220 BaseType_t xReturn;
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222 if( ( xRXDescriptors[ xRxDescriptorIndex ].STATUS & RDES_OWN ) == 0 )
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233 /*-----------------------------------------------------------*/
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235 void vEMACSwapEmptyBufferForRxedData( xNetworkBufferDescriptor_t *pxNetworkBuffer )
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239 /* Swap the buffer in the network buffer with the buffer used by the DMA.
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240 This allows the data to be passed out without having to perform any copies. */
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241 pucTemp = ( uint8_t * ) xRXDescriptors[ xRxDescriptorIndex ].B1ADD;
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242 xRXDescriptors[ xRxDescriptorIndex ].B1ADD = ( uint32_t ) pxNetworkBuffer->pucEthernetBuffer;
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243 pxNetworkBuffer->pucEthernetBuffer = pucTemp;
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245 /* Only supports frames coming in single buffers. If this frame is split
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246 across multiple buffers then reject it (and if the frame is needed increase
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247 the ipconfigNETWORK_MTU setting). */
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248 if( ( xRXDescriptors[ xRxDescriptorIndex ].STATUS & emacEXPECTED_RX_STATUS_MASK ) != emacEXPECTED_RX_STATUS_MASK )
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250 pxNetworkBuffer->xDataLength = 0;
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254 pxNetworkBuffer->xDataLength = ( size_t ) prvReceivedDataLength() - ( ipETHERNET_CRC_BYTES - 1U );;
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257 /*-----------------------------------------------------------*/
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259 static void prvResetRxDescriptors( void )
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262 size_t xBufferSize = ipTOTAL_ETHERNET_FRAME_SIZE;
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264 for( x = 0; x < configNUM_RX_ETHERNET_DMA_DESCRIPTORS; x++ )
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266 /* Obtain the buffer first, as the size of the buffer might be changed
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267 within the pucEthernetBufferGet() call. */
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268 xRXDescriptors[ x ].B1ADD = ( uint32_t ) pucEthernetBufferGet( &xBufferSize );
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269 xRXDescriptors[ x ].STATUS = RDES_OWN;
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270 xRXDescriptors[ x ].CTRL = xBufferSize;
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271 xRXDescriptors[ x ].B2ADD = ( uint32_t ) &xRXDescriptors[ x + 1 ];
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273 configASSERT( ( ( ( uint32_t ) xRXDescriptors[x].B1ADD ) & 0x07 ) == 0 );
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276 /* Last Descriptor */
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277 xRXDescriptors[ configNUM_RX_ETHERNET_DMA_DESCRIPTORS - 1 ].CTRL |= RDES_ENH_RER;
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279 xRxDescriptorIndex = 0;
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281 /* Set Starting address of RX Descriptor list */
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282 LPC_ETHERNET->DMA_REC_DES_ADDR = ( uint32_t ) xRXDescriptors;
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284 /*-----------------------------------------------------------*/
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286 static void prvResetTxDescriptors( void )
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288 /* Initialize Transmit Descriptor and Status array. */
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291 for( x = 0; x < configNUM_TX_ETHERNET_DMA_DESCRIPTORS; x++ )
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293 xTxDescriptors[ x ].CTRLSTAT = TDES_ENH_FS | TDES_ENH_LS;
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294 xTxDescriptors[ x ].BSIZE = 0;
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295 xTxDescriptors[ x ].B2ADD = ( uint32_t ) &xTxDescriptors[ x + 1 ];
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297 /* Packet is assigned when a Tx is initiated. */
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298 xTxDescriptors[ x ].B1ADD = ( uint32_t )NULL;
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301 /* Last Descriptor? */
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302 xTxDescriptors[ configNUM_TX_ETHERNET_DMA_DESCRIPTORS-1 ].CTRLSTAT |= TDES_ENH_TER;
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304 /* Set Starting address of TX Descriptor list */
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305 LPC_ETHERNET->DMA_TRANS_DES_ADDR = ( uint32_t ) xTxDescriptors;
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307 /*-----------------------------------------------------------*/
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309 void ETH_IRQHandler( void )
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311 uint32_t ulInterruptCause;
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312 extern xSemaphoreHandle xEMACRxEventSemaphore;
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314 configASSERT( xEMACRxEventSemaphore );
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316 ulInterruptCause = LPC_ETHERNET->DMA_STAT ;
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318 /* Clear the interrupt. */
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319 LPC_ETHERNET->DMA_STAT |= ( DMA_ST_NIS | DMA_ST_RI );
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321 /* Clear fatal error conditions. NOTE: The driver does not clear all
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322 errors, only those actually experienced. For future reference, range
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323 errors are not actually errors so can be ignored. */
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324 if( ( ulInterruptCause & DMA_ST_FBI ) != 0U )
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326 LPC_ETHERNET->DMA_STAT |= DMA_ST_FBI;
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329 /* Unblock the deferred interrupt handler task if the event was an Rx. */
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330 if( ( ulInterruptCause & DMA_IE_RIE ) != 0UL )
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332 xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL );
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335 /* ulInterruptCause is used for convenience here. A context switch is
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336 wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a
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337 compiler warning. */
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338 portEND_SWITCHING_ISR( ulInterruptCause );
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