2 * FreeRTOS+TCP V2.0.1
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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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28 /* Standard includes. */
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31 /* FreeRTOS includes. */
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32 #include "FreeRTOS.h"
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37 /* Hardware abstraction. */
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38 #include "FreeRTOS_IO.h"
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40 /* FreeRTOS+TCP includes. */
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41 #include "FreeRTOS_UDP_IP.h"
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42 #include "FreeRTOS_Sockets.h"
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43 #include "NetworkBufferManagement.h"
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45 /* Driver includes. */
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46 #include "lpc17xx_emac.h"
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47 #include "lpc17xx_pinsel.h"
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49 /* Demo includes. */
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50 #include "NetworkInterface.h"
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52 #if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES != 1
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53 #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer
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55 #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) )
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58 /* When a packet is ready to be sent, if it cannot be sent immediately then the
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59 task performing the transmit will block for niTX_BUFFER_FREE_WAIT
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60 milliseconds. It will do this a maximum of niMAX_TX_ATTEMPTS before giving
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62 #define niTX_BUFFER_FREE_WAIT ( pdMS_TO_TICKS( 2UL ) )
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63 #define niMAX_TX_ATTEMPTS ( 5 )
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65 /* The length of the queue used to send interrupt status words from the
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66 interrupt handler to the deferred handler task. */
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67 #define niINTERRUPT_QUEUE_LENGTH ( 10 )
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69 /*-----------------------------------------------------------*/
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72 * A deferred interrupt handler task that processes
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74 static void prvEMACHandlerTask( void *pvParameters );
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76 /*-----------------------------------------------------------*/
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78 /* The queue used to communicate Ethernet events with the IP task. */
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79 extern QueueHandle_t xNetworkEventQueue;
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81 /* The semaphore used to wake the deferred interrupt handler task when an Rx
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82 interrupt is received. */
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83 static SemaphoreHandle_t xEMACRxEventSemaphore = NULL;
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84 /*-----------------------------------------------------------*/
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86 BaseType_t xNetworkInterfaceInitialise( void )
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88 EMAC_CFG_Type Emac_Config;
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89 PINSEL_CFG_Type xPinConfig;
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90 BaseType_t xStatus, xReturn;
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91 extern uint8_t ucMACAddress[ 6 ];
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93 /* Enable Ethernet Pins */
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94 boardCONFIGURE_ENET_PINS( xPinConfig );
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96 Emac_Config.Mode = EMAC_MODE_AUTO;
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97 Emac_Config.pbEMAC_Addr = ucMACAddress;
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98 xStatus = EMAC_Init( &Emac_Config );
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100 LPC_EMAC->IntEnable &= ~( EMAC_INT_TX_DONE );
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102 if( xStatus != ERROR )
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104 vSemaphoreCreateBinary( xEMACRxEventSemaphore );
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105 configASSERT( xEMACRxEventSemaphore );
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107 /* The handler task is created at the highest possible priority to
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108 ensure the interrupt handler can return directly to it. */
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109 xTaskCreate( prvEMACHandlerTask, "EMAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
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111 /* Enable the interrupt and set its priority to the minimum
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112 interrupt priority. */
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113 NVIC_SetPriority( ENET_IRQn, configMAC_INTERRUPT_PRIORITY );
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114 NVIC_EnableIRQ( ENET_IRQn );
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123 configASSERT( xStatus != ERROR );
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127 /*-----------------------------------------------------------*/
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129 BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer )
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131 BaseType_t xReturn = pdFAIL;
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133 extern void EMAC_StartTransmitNextBuffer( uint32_t ulLength );
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134 extern void EMAC_SetNextPacketToSend( uint8_t * pucBuffer );
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137 /* Attempt to obtain access to a Tx buffer. */
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138 for( x = 0; x < niMAX_TX_ATTEMPTS; x++ )
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140 if( EMAC_CheckTransmitIndex() == TRUE )
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142 /* Will the data fit in the Tx buffer? */
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143 if( pxNetworkBuffer->xDataLength < EMAC_ETH_MAX_FLEN ) /*_RB_ The size needs to come from FreeRTOSIPConfig.h. */
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145 /* Assign the buffer to the Tx descriptor that is now known to
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147 EMAC_SetNextPacketToSend( pxNetworkBuffer->pucBuffer );
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149 /* The EMAC now owns the buffer. */
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150 pxNetworkBuffer->pucBuffer = NULL;
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152 /* Initiate the Tx. */
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153 EMAC_StartTransmitNextBuffer( pxNetworkBuffer->xDataLength );
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154 iptraceNETWORK_INTERFACE_TRANSMIT();
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156 /* The Tx has been initiated. */
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163 vTaskDelay( niTX_BUFFER_FREE_WAIT );
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167 /* Finished with the network buffer. */
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168 vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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172 /*-----------------------------------------------------------*/
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174 void ENET_IRQHandler( void )
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176 uint32_t ulInterruptCause;
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178 while( ( ulInterruptCause = LPC_EMAC->IntStatus ) != 0 )
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180 /* Clear the interrupt. */
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181 LPC_EMAC->IntClear = ulInterruptCause;
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183 /* Clear fatal error conditions. NOTE: The driver does not clear all
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184 errors, only those actually experienced. For future reference, range
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185 errors are not actually errors so can be ignored. */
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186 if( ( ulInterruptCause & EMAC_INT_TX_UNDERRUN ) != 0U )
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188 LPC_EMAC->Command |= EMAC_CR_TX_RES;
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191 /* Unblock the deferred interrupt handler task if the event was an
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193 if( ( ulInterruptCause & EMAC_INT_RX_DONE ) != 0UL )
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195 xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL );
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199 /* ulInterruptCause is used for convenience here. A context switch is
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200 wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a
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201 compiler warning. */
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202 portEND_SWITCHING_ISR( ulInterruptCause );
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204 /*-----------------------------------------------------------*/
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206 static void prvEMACHandlerTask( void *pvParameters )
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208 size_t xDataLength;
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209 const uint16_t usCRCLength = 4;
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210 NetworkBufferDescriptor_t *pxNetworkBuffer;
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211 IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL };
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213 /* This is not included in the header file for some reason. */
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214 extern uint8_t *EMAC_NextPacketToRead( void );
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216 ( void ) pvParameters;
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217 configASSERT( xEMACRxEventSemaphore );
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221 /* Wait for the EMAC interrupt to indicate that another packet has been
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222 received. The while() loop is only needed if INCLUDE_vTaskSuspend is
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223 set to 0 in FreeRTOSConfig.h. */
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224 while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE );
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226 /* At least one packet has been received. */
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227 while( EMAC_CheckReceiveIndex() != FALSE )
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229 /* Obtain the length, minus the CRC. The CRC is four bytes
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230 but the length is already minus 1. */
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231 xDataLength = ( size_t ) EMAC_GetReceiveDataSize() - ( usCRCLength - 1U );
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233 if( xDataLength > 0U )
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235 /* Obtain a network buffer to pass this data into the
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236 stack. No storage is required as the network buffer
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237 will point directly to the buffer that already holds
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238 the received data. */
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239 pxNetworkBuffer = pxGetNetworkBufferWithDescriptor( 0, ( TickType_t ) 0 );
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241 if( pxNetworkBuffer != NULL )
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243 pxNetworkBuffer->pucBuffer = EMAC_NextPacketToRead();
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244 pxNetworkBuffer->xDataLength = xDataLength;
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245 xRxEvent.pvData = ( void * ) pxNetworkBuffer;
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247 /* Data was received and stored. Send a message to the IP
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248 task to let it know. */
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249 if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL )
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251 vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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252 iptraceETHERNET_RX_EVENT_LOST();
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257 iptraceETHERNET_RX_EVENT_LOST();
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260 iptraceNETWORK_INTERFACE_RECEIVE();
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263 /* Release the frame. */
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264 EMAC_UpdateRxConsumeIndex();
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268 /*-----------------------------------------------------------*/
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