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/*
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FreeRTOS+TCP V2.0.11
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Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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http://aws.amazon.com/freertos
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http://www.FreeRTOS.org
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*/
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/* Standard includes. */
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#include <stdint.h>
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/* FreeRTOS includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "queue.h"
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#include "semphr.h"
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/* Hardware abstraction. */
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#include "FreeRTOS_IO.h"
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/* FreeRTOS+TCP includes. */
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#include "FreeRTOS_UDP_IP.h"
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#include "FreeRTOS_Sockets.h"
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#include "NetworkBufferManagement.h"
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/* Driver includes. */
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#include "lpc17xx_emac.h"
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#include "lpc17xx_pinsel.h"
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/* Demo includes. */
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#include "NetworkInterface.h"
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#if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES != 1
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#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer
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#else
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#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) )
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#endif
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/* When a packet is ready to be sent, if it cannot be sent immediately then the
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task performing the transmit will block for niTX_BUFFER_FREE_WAIT
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milliseconds. It will do this a maximum of niMAX_TX_ATTEMPTS before giving
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up. */
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#define niTX_BUFFER_FREE_WAIT ( pdMS_TO_TICKS( 2UL ) )
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#define niMAX_TX_ATTEMPTS ( 5 )
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/* The length of the queue used to send interrupt status words from the
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interrupt handler to the deferred handler task. */
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#define niINTERRUPT_QUEUE_LENGTH ( 10 )
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/*-----------------------------------------------------------*/
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/*
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* A deferred interrupt handler task that processes
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*/
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static void prvEMACHandlerTask( void *pvParameters );
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/*-----------------------------------------------------------*/
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/* The queue used to communicate Ethernet events with the IP task. */
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extern QueueHandle_t xNetworkEventQueue;
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/* The semaphore used to wake the deferred interrupt handler task when an Rx
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interrupt is received. */
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static SemaphoreHandle_t xEMACRxEventSemaphore = NULL;
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/*-----------------------------------------------------------*/
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BaseType_t xNetworkInterfaceInitialise( void )
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{
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EMAC_CFG_Type Emac_Config;
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PINSEL_CFG_Type xPinConfig;
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BaseType_t xStatus, xReturn;
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extern uint8_t ucMACAddress[ 6 ];
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/* Enable Ethernet Pins */
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boardCONFIGURE_ENET_PINS( xPinConfig );
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Emac_Config.Mode = EMAC_MODE_AUTO;
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Emac_Config.pbEMAC_Addr = ucMACAddress;
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xStatus = EMAC_Init( &Emac_Config );
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LPC_EMAC->IntEnable &= ~( EMAC_INT_TX_DONE );
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if( xStatus != ERROR )
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{
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vSemaphoreCreateBinary( xEMACRxEventSemaphore );
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configASSERT( xEMACRxEventSemaphore );
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/* The handler task is created at the highest possible priority to
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ensure the interrupt handler can return directly to it. */
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xTaskCreate( prvEMACHandlerTask, "EMAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
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/* Enable the interrupt and set its priority to the minimum
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interrupt priority. */
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NVIC_SetPriority( ENET_IRQn, configMAC_INTERRUPT_PRIORITY );
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NVIC_EnableIRQ( ENET_IRQn );
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xReturn = pdPASS;
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}
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else
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{
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xReturn = pdFAIL;
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}
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configASSERT( xStatus != ERROR );
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer )
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{
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BaseType_t xReturn = pdFAIL;
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int32_t x;
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extern void EMAC_StartTransmitNextBuffer( uint32_t ulLength );
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extern void EMAC_SetNextPacketToSend( uint8_t * pucBuffer );
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/* Attempt to obtain access to a Tx buffer. */
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for( x = 0; x < niMAX_TX_ATTEMPTS; x++ )
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{
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if( EMAC_CheckTransmitIndex() == TRUE )
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{
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/* Will the data fit in the Tx buffer? */
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if( pxNetworkBuffer->xDataLength < EMAC_ETH_MAX_FLEN ) /*_RB_ The size needs to come from FreeRTOSIPConfig.h. */
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{
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/* Assign the buffer to the Tx descriptor that is now known to
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be free. */
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EMAC_SetNextPacketToSend( pxNetworkBuffer->pucBuffer );
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/* The EMAC now owns the buffer. */
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pxNetworkBuffer->pucBuffer = NULL;
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/* Initiate the Tx. */
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EMAC_StartTransmitNextBuffer( pxNetworkBuffer->xDataLength );
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iptraceNETWORK_INTERFACE_TRANSMIT();
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/* The Tx has been initiated. */
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xReturn = pdPASS;
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}
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break;
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}
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else
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{
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vTaskDelay( niTX_BUFFER_FREE_WAIT );
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}
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}
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/* Finished with the network buffer. */
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vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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void ENET_IRQHandler( void )
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{
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uint32_t ulInterruptCause;
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while( ( ulInterruptCause = LPC_EMAC->IntStatus ) != 0 )
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{
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/* Clear the interrupt. */
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LPC_EMAC->IntClear = ulInterruptCause;
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/* Clear fatal error conditions. NOTE: The driver does not clear all
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errors, only those actually experienced. For future reference, range
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errors are not actually errors so can be ignored. */
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if( ( ulInterruptCause & EMAC_INT_TX_UNDERRUN ) != 0U )
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{
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LPC_EMAC->Command |= EMAC_CR_TX_RES;
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}
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/* Unblock the deferred interrupt handler task if the event was an
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Rx. */
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if( ( ulInterruptCause & EMAC_INT_RX_DONE ) != 0UL )
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{
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xSemaphoreGiveFromISR( xEMACRxEventSemaphore, NULL );
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}
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}
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/* ulInterruptCause is used for convenience here. A context switch is
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wanted, but coding portEND_SWITCHING_ISR( 1 ) would likely result in a
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compiler warning. */
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portEND_SWITCHING_ISR( ulInterruptCause );
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}
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/*-----------------------------------------------------------*/
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static void prvEMACHandlerTask( void *pvParameters )
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{
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size_t xDataLength;
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const uint16_t usCRCLength = 4;
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NetworkBufferDescriptor_t *pxNetworkBuffer;
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IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL };
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/* This is not included in the header file for some reason. */
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extern uint8_t *EMAC_NextPacketToRead( void );
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( void ) pvParameters;
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configASSERT( xEMACRxEventSemaphore );
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for( ;; )
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{
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/* Wait for the EMAC interrupt to indicate that another packet has been
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received. The while() loop is only needed if INCLUDE_vTaskSuspend is
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set to 0 in FreeRTOSConfig.h. */
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while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE );
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/* At least one packet has been received. */
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while( EMAC_CheckReceiveIndex() != FALSE )
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{
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/* Obtain the length, minus the CRC. The CRC is four bytes
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but the length is already minus 1. */
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xDataLength = ( size_t ) EMAC_GetReceiveDataSize() - ( usCRCLength - 1U );
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if( xDataLength > 0U )
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{
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/* Obtain a network buffer to pass this data into the
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stack. No storage is required as the network buffer
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will point directly to the buffer that already holds
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the received data. */
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pxNetworkBuffer = pxGetNetworkBufferWithDescriptor( 0, ( TickType_t ) 0 );
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if( pxNetworkBuffer != NULL )
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{
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pxNetworkBuffer->pucBuffer = EMAC_NextPacketToRead();
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pxNetworkBuffer->xDataLength = xDataLength;
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xRxEvent.pvData = ( void * ) pxNetworkBuffer;
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/* Data was received and stored. Send a message to the IP
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task to let it know. */
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if( xSendEventStructToIPTask( &xRxEvent, ( TickType_t ) 0 ) == pdFAIL )
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{
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vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );
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iptraceETHERNET_RX_EVENT_LOST();
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}
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}
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else
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{
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iptraceETHERNET_RX_EVENT_LOST();
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}
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iptraceNETWORK_INTERFACE_RECEIVE();
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}
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/* Release the frame. */
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EMAC_UpdateRxConsumeIndex();
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}
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}
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}
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/*-----------------------------------------------------------*/
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