text: /*
  FreeRTOS+TCP V2.0.11
  Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  
  Permission is hereby granted, free of charge, to any person obtaining a copy of
  this software and associated documentation files (the "Software"), to deal in
  the Software without restriction, including without limitation the rights to
  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  the Software, and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
   http://aws.amazon.com/freertos
   http://www.FreeRTOS.org
  */
  
  /* Standard includes. */
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  /* FreeRTOS includes. */
  #include "FreeRTOS.h"
  #include "task.h"
  #include "queue.h"
  #include "semphr.h"
  
  /* FreeRTOS+TCP includes. */
  #include "FreeRTOS_IP.h"
  #include "FreeRTOS_Sockets.h"
  #include "FreeRTOS_IP_Private.h"
  #include "NetworkBufferManagement.h"
  #include "NetworkInterface.h"
  
  /* Some files from the Atmel Software Framework */
  /*_RB_ The SAM4E portable layer has three different header files called gmac.h! */
  #include "instance/gmac.h"
  #include <sysclk.h>
  #include <ethernet_phy.h>
  
  #ifndef	BMSR_LINK_STATUS
  	#define BMSR_LINK_STATUS            0x0004  //!< Link status
  #endif
  
  #ifndef	PHY_LS_HIGH_CHECK_TIME_MS
  	/* Check if the LinkSStatus in the PHY is still high after 15 seconds of not
  	receiving packets. */
  	#define PHY_LS_HIGH_CHECK_TIME_MS	15000
  #endif
  
  #ifndef	PHY_LS_LOW_CHECK_TIME_MS
  	/* Check if the LinkSStatus in the PHY is still low every second. */
  	#define PHY_LS_LOW_CHECK_TIME_MS	1000
  #endif
  
  /* Interrupt events to process.  Currently only the Rx event is processed
  although code for other events is included to allow for possible future
  expansion. */
  #define EMAC_IF_RX_EVENT        1UL
  #define EMAC_IF_TX_EVENT        2UL
  #define EMAC_IF_ERR_EVENT       4UL
  #define EMAC_IF_ALL_EVENT       ( EMAC_IF_RX_EVENT | EMAC_IF_TX_EVENT | EMAC_IF_ERR_EVENT )
  
  #define ETHERNET_CONF_PHY_ADDR  BOARD_GMAC_PHY_ADDR
  
  #define HZ_PER_MHZ				( 1000000UL )
  
  #ifndef	EMAC_MAX_BLOCK_TIME_MS
  	#define	EMAC_MAX_BLOCK_TIME_MS	100ul
  #endif
  
  #if !defined( GMAC_USES_TX_CALLBACK ) || ( GMAC_USES_TX_CALLBACK != 1 )
  	#error Please define GMAC_USES_TX_CALLBACK as 1
  #endif
  
  /* Default the size of the stack used by the EMAC deferred handler task to 4x
  the size of the stack used by the idle task - but allow this to be overridden in
  FreeRTOSConfig.h as configMINIMAL_STACK_SIZE is a user definable constant. */
  #ifndef configEMAC_TASK_STACK_SIZE
  	#define configEMAC_TASK_STACK_SIZE ( 4 * configMINIMAL_STACK_SIZE )
  #endif
  
  /*-----------------------------------------------------------*/
  
  /*
   * Wait a fixed time for the link status to indicate the network is up.
   */
  static BaseType_t xGMACWaitLS( TickType_t xMaxTime );
  
  #if( ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM == 1 ) && ( ipconfigHAS_TX_CRC_OFFLOADING == 0 )
  	void vGMACGenerateChecksum( uint8_t *apBuffer );
  #endif
  
  /*
   * Called from the ASF GMAC driver.
   */
  static void prvRxCallback( uint32_t ulStatus );
  static void prvTxCallback( uint32_t ulStatus, uint8_t *puc_buffer );
  
  /*
   * A deferred interrupt handler task that processes GMAC interrupts.
   */
  static void prvEMACHandlerTask( void *pvParameters );
  
  /*
   * Initialise the ASF GMAC driver.
   */
  static BaseType_t prvGMACInit( void );
  
  /*
   * Try to obtain an Rx packet from the hardware.
   */
  static uint32_t prvEMACRxPoll( void );
  
  /*-----------------------------------------------------------*/
  
  /* Bit map of outstanding ETH interrupt events for processing.  Currently only
  the Rx interrupt is handled, although code is included for other events to
  enable future expansion. */
  static volatile uint32_t ulISREvents;
  
  /* A copy of PHY register 1: 'PHY_REG_01_BMSR' */
  static uint32_t ulPHYLinkStatus = 0;
  static volatile BaseType_t xGMACSwitchRequired;
  
  /* ethernet_phy_addr: the address of the PHY in use.
  Atmel was a bit ambiguous about it so the address will be stored
  in this variable, see ethernet_phy.c */
  extern int ethernet_phy_addr;
  
  /* LLMNR multicast address. */
  static const uint8_t llmnr_mac_address[] = { 0x01, 0x00, 0x5E, 0x00, 0x00, 0xFC };
  
  /* The GMAC object as defined by the ASF drivers. */
  static gmac_device_t gs_gmac_dev;
  
  /* MAC address to use. */
  extern const uint8_t ucMACAddress[ 6 ];
  
  /* Holds the handle of the task used as a deferred interrupt processor.  The
  handle is used so direct notifications can be sent to the task for all EMAC/DMA
  related interrupts. */
  TaskHandle_t xEMACTaskHandle = NULL;
  
  static QueueHandle_t xTxBufferQueue;
  int tx_release_count[ 4 ];
  
  /* xTXDescriptorSemaphore is a counting semaphore with
  a maximum count of GMAC_TX_BUFFERS, which is the number of
  DMA TX descriptors. */
  static SemaphoreHandle_t xTXDescriptorSemaphore = NULL;
  
  /*-----------------------------------------------------------*/
  
  /*
   * GMAC interrupt handler.
   */
  void GMAC_Handler(void)
  {
  	xGMACSwitchRequired = pdFALSE;
  
  	/* gmac_handler() may call prvRxCallback() which may change
  	the value of xGMACSwitchRequired. */
  	gmac_handler( &gs_gmac_dev );
  
  	if( xGMACSwitchRequired != pdFALSE )
  	{
  		portEND_SWITCHING_ISR( xGMACSwitchRequired );
  	}
  }
  /*-----------------------------------------------------------*/
  
  static void prvRxCallback( uint32_t ulStatus )
  {
  	if( ( ( ulStatus & GMAC_RSR_REC ) != 0 ) && ( xEMACTaskHandle != NULL ) )
  	{
  		/* let the prvEMACHandlerTask know that there was an RX event. */
  		ulISREvents |= EMAC_IF_RX_EVENT;
  		/* Only an RX interrupt can wakeup prvEMACHandlerTask. */
  		vTaskNotifyGiveFromISR( xEMACTaskHandle, ( BaseType_t * ) &xGMACSwitchRequired );
  	}
  }
  /*-----------------------------------------------------------*/
  
  static void prvTxCallback( uint32_t ulStatus, uint8_t *puc_buffer )
  {
  	if( ( xTxBufferQueue != NULL ) && ( xEMACTaskHandle != NULL ) )
  	{
  		/* let the prvEMACHandlerTask know that there was an RX event. */
  		ulISREvents |= EMAC_IF_TX_EVENT;
  
  		vTaskNotifyGiveFromISR( xEMACTaskHandle, ( BaseType_t * ) &xGMACSwitchRequired );
  		xQueueSendFromISR( xTxBufferQueue, &puc_buffer, ( BaseType_t * ) &xGMACSwitchRequired );
  		tx_release_count[ 2 ]++;
  	}
  }
  /*-----------------------------------------------------------*/
  
  BaseType_t xNetworkInterfaceInitialise( void )
  {
  const TickType_t x5_Seconds = 5000UL;
  
  	if( xEMACTaskHandle == NULL )
  	{
  		prvGMACInit();
  
  		/* Wait at most 5 seconds for a Link Status in the PHY. */
  		xGMACWaitLS( pdMS_TO_TICKS( x5_Seconds ) );
  
  		/* The handler task is created at the highest possible priority to
  		ensure the interrupt handler can return directly to it. */
  		xTaskCreate( prvEMACHandlerTask, "EMAC", configEMAC_TASK_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, &xEMACTaskHandle );
  		configASSERT( xEMACTaskHandle );
  	}
  
  	if( xTxBufferQueue == NULL )
  	{
  		xTxBufferQueue = xQueueCreate( GMAC_TX_BUFFERS, sizeof( void * ) );
  		configASSERT( xTxBufferQueue );
  	}
  
  	if( xTXDescriptorSemaphore == NULL )
  	{
  		xTXDescriptorSemaphore = xSemaphoreCreateCounting( ( UBaseType_t ) GMAC_TX_BUFFERS, ( UBaseType_t ) GMAC_TX_BUFFERS );
  		configASSERT( xTXDescriptorSemaphore );
  	}
  	/* When returning non-zero, the stack will become active and
      start DHCP (in configured) */
  	return ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0;
  }
  /*-----------------------------------------------------------*/
  
  BaseType_t xGetPhyLinkStatus( void )
  {
  BaseType_t xResult;
  
  	/* This function returns true if the Link Status in the PHY is high. */
  	if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0 )
  	{
  		xResult = pdTRUE;
  	}
  	else
  	{
  		xResult = pdFALSE;
  	}
  
  	return xResult;
  }
  /*-----------------------------------------------------------*/
  
  BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxDescriptor, BaseType_t bReleaseAfterSend )
  {
  /* Do not wait too long for a free TX DMA buffer. */
  const TickType_t xBlockTimeTicks = pdMS_TO_TICKS( 50u );
  
  	do {
  		if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) == 0 )
  		{
  			/* Do not attempt to send packets as long as the Link Status is low. */
  			break;
  		}
  		if( xTXDescriptorSemaphore == NULL )
  		{
  			/* Semaphore has not been created yet? */
  			break;
  		}
  		if( xSemaphoreTake( xTXDescriptorSemaphore, xBlockTimeTicks ) != pdPASS )
  		{
  			/* Time-out waiting for a free TX descriptor. */
  			tx_release_count[ 3 ]++;
  			break;
  		}
  		#if( ipconfigZERO_COPY_TX_DRIVER != 0 )
  		{
  			/* Confirm that the pxDescriptor may be kept by the driver. */
  			configASSERT( bReleaseAfterSend != pdFALSE );
  		}
  		#endif /* ipconfigZERO_COPY_TX_DRIVER */
  
  		gmac_dev_write( &gs_gmac_dev, (void *)pxDescriptor->pucEthernetBuffer, pxDescriptor->xDataLength, prvTxCallback );
  
  		#if( ipconfigZERO_COPY_TX_DRIVER != 0 )
  		{
  			/* Confirm that the pxDescriptor may be kept by the driver. */
  			bReleaseAfterSend = pdFALSE;
  		}
  		#endif /* ipconfigZERO_COPY_TX_DRIVER */
  		/* Not interested in a call-back after TX. */
  		iptraceNETWORK_INTERFACE_TRANSMIT();
  	} while( 0 );
  
  	if( bReleaseAfterSend != pdFALSE )
  	{
  		vReleaseNetworkBufferAndDescriptor( pxDescriptor );
  	}
  	return pdTRUE;
  }
  /*-----------------------------------------------------------*/
  
  static BaseType_t prvGMACInit( void )
  {
  uint32_t ncfgr;
  
  	gmac_options_t gmac_option;
  
  	memset( &gmac_option, '\0', sizeof( gmac_option ) );
  	gmac_option.uc_copy_all_frame = 0;
  	gmac_option.uc_no_boardcast = 0;
  	memcpy( gmac_option.uc_mac_addr, ucMACAddress, sizeof( gmac_option.uc_mac_addr ) );
  
  	gs_gmac_dev.p_hw = GMAC;
  	gmac_dev_init( GMAC, &gs_gmac_dev, &gmac_option );
  
  	NVIC_SetPriority( GMAC_IRQn, configMAC_INTERRUPT_PRIORITY );
  	NVIC_EnableIRQ( GMAC_IRQn );
  
  	/* Contact the Ethernet PHY and store it's address in 'ethernet_phy_addr' */
  	ethernet_phy_init( GMAC, ETHERNET_CONF_PHY_ADDR, sysclk_get_cpu_hz() );
  
  	ethernet_phy_auto_negotiate( GMAC, ethernet_phy_addr );
  	ethernet_phy_set_link( GMAC, ethernet_phy_addr, 1 );
  
  	/* The GMAC driver will call a hook prvRxCallback(), which
  	in turn will wake-up the task by calling vTaskNotifyGiveFromISR() */
  	gmac_dev_set_rx_callback( &gs_gmac_dev, prvRxCallback );
  	gmac_set_address( GMAC, 1, (uint8_t*)llmnr_mac_address );
  
  	ncfgr = GMAC_NCFGR_SPD | GMAC_NCFGR_FD;
  
  	GMAC->GMAC_NCFGR = ( GMAC->GMAC_NCFGR & ~( GMAC_NCFGR_SPD | GMAC_NCFGR_FD ) ) | ncfgr;
  
  	return 1;
  }
  /*-----------------------------------------------------------*/
  
  static inline unsigned long ulReadMDIO( unsigned /*short*/ usAddress )
  {
  uint32_t ulValue, ulReturn;
  int rc;
  
  	gmac_enable_management( GMAC, 1 );
  	rc = gmac_phy_read( GMAC, ethernet_phy_addr, usAddress, &ulValue );
  	gmac_enable_management( GMAC, 0 );
  	if( rc == GMAC_OK )
  	{
  		ulReturn = ulValue;
  	}
  	else
  	{
  		ulReturn = 0UL;
  	}
  
  	return ulReturn;
  }
  /*-----------------------------------------------------------*/
  
  static BaseType_t xGMACWaitLS( TickType_t xMaxTime )
  {
  TickType_t xStartTime = xTaskGetTickCount();
  TickType_t xEndTime;
  BaseType_t xReturn;
  const TickType_t xShortTime = pdMS_TO_TICKS( 100UL );
  
  	for( ;; )
  	{
  		xEndTime = xTaskGetTickCount();
  
  		if( ( xEndTime - xStartTime ) > xMaxTime )
  		{
  			/* Wated more than xMaxTime, return. */
  			xReturn = pdFALSE;
  			break;
  		}
  
  		/* Check the link status again. */
  		ulPHYLinkStatus = ulReadMDIO( PHY_REG_01_BMSR );
  
  		if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0 )
  		{
  			/* Link is up - return. */
  			xReturn = pdTRUE;
  			break;
  		}
  
  		/* Link is down - wait in the Blocked state for a short while (to allow
  		other tasks to execute) before checking again. */
  		vTaskDelay( xShortTime );
  	}
  
  	FreeRTOS_printf( ( "xGMACWaitLS: %ld (PHY %d) freq %lu Mz\n",
  		xReturn,
  		ethernet_phy_addr,
  		sysclk_get_cpu_hz() / HZ_PER_MHZ ) );
  
  	return xReturn;
  }
  /*-----------------------------------------------------------*/
  
  //#if( ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM == 1 ) && ( ipconfigHAS_TX_CRC_OFFLOADING == 0 )
  
  	void vGMACGenerateChecksum( uint8_t *apBuffer )
  	{
  	ProtocolPacket_t *xProtPacket = (ProtocolPacket_t *)apBuffer;
  
  		if ( xProtPacket->xTCPPacket.xEthernetHeader.usFrameType == ipIPv4_FRAME_TYPE )
  		{
  			IPHeader_t *pxIPHeader = &(xProtPacket->xTCPPacket.xIPHeader);
  
  			/* Calculate the IP header checksum. */
  			pxIPHeader->usHeaderChecksum = 0x00;
  			pxIPHeader->usHeaderChecksum = usGenerateChecksum( 0, ( uint8_t * ) &( pxIPHeader->ucVersionHeaderLength ), ipSIZE_OF_IPv4_HEADER );
  			pxIPHeader->usHeaderChecksum = ~FreeRTOS_htons( pxIPHeader->usHeaderChecksum );
  
  			/* Calculate the TCP checksum for an outgoing packet. */
  			usGenerateProtocolChecksum( ( uint8_t * ) apBuffer, pdTRUE );
  		}
  	}
  
  //#endif
  /*-----------------------------------------------------------*/
  
  static uint32_t prvEMACRxPoll( void )
  {
  unsigned char *pucUseBuffer;
  uint32_t ulReceiveCount, ulResult, ulReturnValue = 0;
  static NetworkBufferDescriptor_t *pxNextNetworkBufferDescriptor = NULL;
  const UBaseType_t xMinDescriptorsToLeave = 2UL;
  const TickType_t xBlockTime = pdMS_TO_TICKS( 100UL );
  static IPStackEvent_t xRxEvent = { eNetworkRxEvent, NULL };
  
  	for( ;; )
  	{
  		/* If pxNextNetworkBufferDescriptor was not left pointing at a valid
  		descriptor then allocate one now. */
  		if( ( pxNextNetworkBufferDescriptor == NULL ) && ( uxGetNumberOfFreeNetworkBuffers() > xMinDescriptorsToLeave ) )
  		{
  			pxNextNetworkBufferDescriptor = pxGetNetworkBufferWithDescriptor( ipTOTAL_ETHERNET_FRAME_SIZE, xBlockTime );
  		}
  
  		if( pxNextNetworkBufferDescriptor != NULL )
  		{
  			/* Point pucUseBuffer to the buffer pointed to by the descriptor. */
  			pucUseBuffer = ( unsigned char* ) ( pxNextNetworkBufferDescriptor->pucEthernetBuffer - ipconfigPACKET_FILLER_SIZE );
  		}
  		else
  		{
  			/* As long as pxNextNetworkBufferDescriptor is NULL, the incoming
  			messages will be flushed and ignored. */
  			pucUseBuffer = NULL;
  		}
  
  		/* Read the next packet from the hardware into pucUseBuffer. */
  		ulResult = gmac_dev_read( &gs_gmac_dev, pucUseBuffer, ipTOTAL_ETHERNET_FRAME_SIZE, &ulReceiveCount );
  
  		if( ( ulResult != GMAC_OK ) || ( ulReceiveCount == 0 ) )
  		{
  			/* No data from the hardware. */
  			break;
  		}
  
  		if( pxNextNetworkBufferDescriptor == NULL )
  		{
  			/* Data was read from the hardware, but no descriptor was available
  			for it, so it will be dropped. */
  			iptraceETHERNET_RX_EVENT_LOST();
  			continue;
  		}
  
  		iptraceNETWORK_INTERFACE_RECEIVE();
  		pxNextNetworkBufferDescriptor->xDataLength = ( size_t ) ulReceiveCount;
  		xRxEvent.pvData = ( void * ) pxNextNetworkBufferDescriptor;
  
  		/* Send the descriptor to the IP task for processing. */
  		if( xSendEventStructToIPTask( &xRxEvent, xBlockTime ) != pdTRUE )
  		{
  			/* The buffer could not be sent to the stack so must be released
  			again. */
  			vReleaseNetworkBufferAndDescriptor( pxNextNetworkBufferDescriptor );
  			iptraceETHERNET_RX_EVENT_LOST();
  			FreeRTOS_printf( ( "prvEMACRxPoll: Can not queue return packet!\n" ) );
  		}
  
  		/* Now the buffer has either been passed to the IP-task,
  		or it has been released in the code above. */
  		pxNextNetworkBufferDescriptor = NULL;
  		ulReturnValue++;
  	}
  
  	return ulReturnValue;
  }
  /*-----------------------------------------------------------*/
  
  static void prvEMACHandlerTask( void *pvParameters )
  {
  TimeOut_t xPhyTime;
  TickType_t xPhyRemTime;
  UBaseType_t uxLastMinBufferCount = 0, uxCount;
  UBaseType_t uxCurrentCount;
  #if( ipconfigCHECK_IP_QUEUE_SPACE != 0 )
  	UBaseType_t uxLastMinQueueSpace;
  #endif
  #if( ipconfigZERO_COPY_TX_DRIVER != 0 )
  	NetworkBufferDescriptor_t *pxBuffer;
  #endif
  uint8_t *pucBuffer;
  BaseType_t xResult = 0;
  uint32_t xStatus;
  const TickType_t ulMaxBlockTime = pdMS_TO_TICKS( EMAC_MAX_BLOCK_TIME_MS );
  
  	/* Remove compiler warnings about unused parameters. */
  	( void ) pvParameters;
  
  	configASSERT( xEMACTaskHandle );
  
  	vTaskSetTimeOutState( &xPhyTime );
  	xPhyRemTime = pdMS_TO_TICKS( PHY_LS_LOW_CHECK_TIME_MS );
  
  	for( ;; )
  	{
  		uxCurrentCount = uxGetMinimumFreeNetworkBuffers();
  		if( uxLastMinBufferCount != uxCurrentCount )
  		{
  			/* The logging produced below may be helpful
  			while tuning +TCP: see how many buffers are in use. */
  			uxLastMinBufferCount = uxCurrentCount;
  			FreeRTOS_printf( ( "Network buffers: %lu lowest %lu\n",
  				uxGetNumberOfFreeNetworkBuffers(), uxCurrentCount ) );
  		}
  
  		#if( ipconfigCHECK_IP_QUEUE_SPACE != 0 )
  		{
  			uxCurrentCount = uxGetMinimumIPQueueSpace();
  			if( uxLastMinQueueSpace != uxCurrentCount )
  			{
  				/* The logging produced below may be helpful
  				while tuning +TCP: see how many buffers are in use. */
  				uxLastMinQueueSpace = uxCurrentCount;
  				FreeRTOS_printf( ( "Queue space: lowest %lu\n", uxCurrentCount ) );
  			}
  		}
  		#endif /* ipconfigCHECK_IP_QUEUE_SPACE */
  
  		if( ( ulISREvents & EMAC_IF_ALL_EVENT ) == 0 )
  		{
  			/* No events to process now, wait for the next. */
  			ulTaskNotifyTake( pdFALSE, ulMaxBlockTime );
  		}
  
  		if( ( ulISREvents & EMAC_IF_RX_EVENT ) != 0 )
  		{
  			ulISREvents &= ~EMAC_IF_RX_EVENT;
  
  			/* Wait for the EMAC interrupt to indicate that another packet has been
  			received. */
  			xResult = prvEMACRxPoll();
  		}
  
  		if( ( ulISREvents & EMAC_IF_TX_EVENT ) != 0 )
  		{
  			/* Future extension: code to release TX buffers if zero-copy is used. */
  			ulISREvents &= ~EMAC_IF_TX_EVENT;
  			while( xQueueReceive( xTxBufferQueue, &pucBuffer, 0 ) != pdFALSE )
  			{
  				#if( ipconfigZERO_COPY_TX_DRIVER != 0 )
  				{
  					pxBuffer = pxPacketBuffer_to_NetworkBuffer( pucBuffer );
  					if( pxBuffer != NULL )
  					{
  						vReleaseNetworkBufferAndDescriptor( pxBuffer );
  						tx_release_count[ 0 ]++;
  					}
  					else
  					{
  						tx_release_count[ 1 ]++;
  					}
  				}
  				#else
  				{
  					tx_release_count[ 0 ]++;
  				}
  				#endif
  				uxCount = uxQueueMessagesWaiting( ( QueueHandle_t ) xTXDescriptorSemaphore );
  				if( uxCount < GMAC_TX_BUFFERS )
  				{
  					/* Tell the counting semaphore that one more TX descriptor is available. */
  					xSemaphoreGive( xTXDescriptorSemaphore );
  				}
  			}
  		}
  
  		if( ( ulISREvents & EMAC_IF_ERR_EVENT ) != 0 )
  		{
  			/* Future extension: logging about errors that occurred. */
  			ulISREvents &= ~EMAC_IF_ERR_EVENT;
  		}
  
  		if( xResult > 0 )
  		{
  			/* A packet was received. No need to check for the PHY status now,
  			but set a timer to check it later on. */
  			vTaskSetTimeOutState( &xPhyTime );
  			xPhyRemTime = pdMS_TO_TICKS( PHY_LS_HIGH_CHECK_TIME_MS );
  			xResult = 0;
  		}
  		else if( xTaskCheckForTimeOut( &xPhyTime, &xPhyRemTime ) != pdFALSE )
  		{
  			/* Check the link status again. */
  			xStatus = ulReadMDIO( PHY_REG_01_BMSR );
  
  			if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != ( xStatus & BMSR_LINK_STATUS ) )
  			{
  				ulPHYLinkStatus = xStatus;
  				FreeRTOS_printf( ( "prvEMACHandlerTask: PHY LS now %d\n", ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0 ) );
  			}
  
  			vTaskSetTimeOutState( &xPhyTime );
  			if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0 )
  			{
  				xPhyRemTime = pdMS_TO_TICKS( PHY_LS_HIGH_CHECK_TIME_MS );
  			}
  			else
  			{
  				xPhyRemTime = pdMS_TO_TICKS( PHY_LS_LOW_CHECK_TIME_MS );
  			}
  		}
  	}
  }
  /*-----------------------------------------------------------*/
  