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://aws.amazon.com/freertos
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23 http://www.FreeRTOS.org
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26 /* Standard includes. */
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29 /* FreeRTOS includes. */
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30 #include "FreeRTOS.h"
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35 /* Hardware abstraction. */
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36 #include "FreeRTOS_IO.h"
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38 /* FreeRTOS+TCP includes. */
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39 #include "FreeRTOS_UDP_IP.h"
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40 #include "FreeRTOS_Sockets.h"
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41 #include "NetworkBufferManagement.h"
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43 /* Driver includes. */
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44 #include "lpc17xx_emac.h"
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45 #include "lpc17xx_pinsel.h"
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47 /* Demo includes. */
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48 #include "NetworkInterface.h"
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50 #if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES != 1
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51 #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer
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53 #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) )
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56 /* When a packet is ready to be sent, if it cannot be sent immediately then the
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57 task performing the transmit will block for niTX_BUFFER_FREE_WAIT
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58 milliseconds. It will do this a maximum of niMAX_TX_ATTEMPTS before giving
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60 #define niTX_BUFFER_FREE_WAIT ( pdMS_TO_TICKS( 2UL ) )
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61 #define niMAX_TX_ATTEMPTS ( 5 )
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63 /* The length of the queue used to send interrupt status words from the
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64 interrupt handler to the deferred handler task. */
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65 #define niINTERRUPT_QUEUE_LENGTH ( 10 )
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67 /*-----------------------------------------------------------*/
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70 * A deferred interrupt handler task that processes
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72 static void prvEMACHandlerTask( void *pvParameters );
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74 /*-----------------------------------------------------------*/
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76 /* The queue used to communicate Ethernet events with the IP task. */
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77 extern QueueHandle_t xNetworkEventQueue;
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79 /* The semaphore used to wake the deferred interrupt handler task when an Rx
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80 interrupt is received. */
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81 static SemaphoreHandle_t xEMACRxEventSemaphore = NULL;
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82 /*-----------------------------------------------------------*/
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84 BaseType_t xNetworkInterfaceInitialise( void )
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86 EMAC_CFG_Type Emac_Config;
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87 PINSEL_CFG_Type xPinConfig;
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88 BaseType_t xStatus, xReturn;
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89 extern uint8_t ucMACAddress[ 6 ];
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91 /* Enable Ethernet Pins */
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92 boardCONFIGURE_ENET_PINS( xPinConfig );
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94 Emac_Config.Mode = EMAC_MODE_AUTO;
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95 Emac_Config.pbEMAC_Addr = ucMACAddress;
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96 xStatus = EMAC_Init( &Emac_Config );
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98 LPC_EMAC->IntEnable &= ~( EMAC_INT_TX_DONE );
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100 if( xStatus != ERROR )
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102 vSemaphoreCreateBinary( xEMACRxEventSemaphore );
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103 configASSERT( xEMACRxEventSemaphore );
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105 /* The handler task is created at the highest possible priority to
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106 ensure the interrupt handler can return directly to it. */
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107 xTaskCreate( prvEMACHandlerTask, "EMAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
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109 /* Enable the interrupt and set its priority to the minimum
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110 interrupt priority. */
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111 NVIC_SetPriority( ENET_IRQn, configMAC_INTERRUPT_PRIORITY );
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112 NVIC_EnableIRQ( ENET_IRQn );
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121 configASSERT( xStatus != ERROR );
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125 /*-----------------------------------------------------------*/
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127 BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer )
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129 BaseType_t xReturn = pdFAIL;
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131 extern void EMAC_StartTransmitNextBuffer( uint32_t ulLength );
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132 extern void EMAC_SetNextPacketToSend( uint8_t * pucBuffer );
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135 /* Attempt to obtain access to a Tx buffer. */
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136 for( x = 0; x < niMAX_TX_ATTEMPTS; x++ )
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138 if( EMAC_CheckTransmitIndex() == TRUE )
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140 /* Will the data fit in the Tx buffer? */
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141 if( pxNetworkBuffer->xDataLength < EMAC_ETH_MAX_FLEN ) /*_RB_ The size needs to come from FreeRTOSIPConfig.h. */
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143 /* Assign the buffer to the Tx descriptor that is now known to
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145 EMAC_SetNextPacketToSend( pxNetworkBuffer->pucBuffer );
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147 /* The EMAC now owns the buffer. */
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148 pxNetworkBuffer->pucBuffer = NULL;
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150 /* Initiate the Tx. */
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151 EMAC_StartTransmitNextBuffer( pxNetworkBuffer->xDataLength );
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152 iptraceNETWORK_INTERFACE_TRANSMIT();
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154 /* The Tx has been initiated. */
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161 vTaskDelay( niTX_BUFFER_FREE_WAIT );
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165 /* Finished with the network buffer. */
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166 vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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170 /*-----------------------------------------------------------*/
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172 void ENET_IRQHandler( void )
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174 uint32_t ulInterruptCause;
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176 while( ( ulInterruptCause = LPC_EMAC->IntStatus ) != 0 )
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178 /* Clear the interrupt. */
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179 LPC_EMAC->IntClear = ulInterruptCause;
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181 /* Clear fatal error conditions. NOTE: The driver does not clear all
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182 errors, only those actually experienced. For future reference, range
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183 errors are not actually errors so can be ignored. */
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184 if( ( ulInterruptCause & EMAC_INT_TX_UNDERRUN ) != 0U )
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186 LPC_EMAC->Command |= EMAC_CR_TX_RES;
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189 /* Unblock the deferred interrupt handler task if the event was an
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191 if( ( ulInterruptCause & EMAC_INT_RX_DONE ) != 0UL )
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193 xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL );
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197 /* ulInterruptCause is used for convenience here. A context switch is
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198 wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a
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199 compiler warning. */
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200 portEND_SWITCHING_ISR( ulInterruptCause );
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202 /*-----------------------------------------------------------*/
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204 static void prvEMACHandlerTask( void *pvParameters )
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206 size_t xDataLength;
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207 const uint16_t usCRCLength = 4;
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208 NetworkBufferDescriptor_t *pxNetworkBuffer;
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209 IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL };
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211 /* This is not included in the header file for some reason. */
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212 extern uint8_t *EMAC_NextPacketToRead( void );
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214 ( void ) pvParameters;
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215 configASSERT( xEMACRxEventSemaphore );
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219 /* Wait for the EMAC interrupt to indicate that another packet has been
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220 received. The while() loop is only needed if INCLUDE_vTaskSuspend is
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221 set to 0 in FreeRTOSConfig.h. */
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222 while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE );
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224 /* At least one packet has been received. */
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225 while( EMAC_CheckReceiveIndex() != FALSE )
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227 /* Obtain the length, minus the CRC. The CRC is four bytes
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228 but the length is already minus 1. */
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229 xDataLength = ( size_t ) EMAC_GetReceiveDataSize() - ( usCRCLength - 1U );
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231 if( xDataLength > 0U )
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233 /* Obtain a network buffer to pass this data into the
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234 stack. No storage is required as the network buffer
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235 will point directly to the buffer that already holds
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236 the received data. */
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237 pxNetworkBuffer = pxGetNetworkBufferWithDescriptor( 0, ( TickType_t ) 0 );
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239 if( pxNetworkBuffer != NULL )
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241 pxNetworkBuffer->pucBuffer = EMAC_NextPacketToRead();
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242 pxNetworkBuffer->xDataLength = xDataLength;
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243 xRxEvent.pvData = ( void * ) pxNetworkBuffer;
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245 /* Data was received and stored. Send a message to the IP
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246 task to let it know. */
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247 if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL )
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249 vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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250 iptraceETHERNET_RX_EVENT_LOST();
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255 iptraceETHERNET_RX_EVENT_LOST();
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258 iptraceNETWORK_INTERFACE_RECEIVE();
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261 /* Release the frame. */
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262 EMAC_UpdateRxConsumeIndex();
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266 /*-----------------------------------------------------------*/
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