/*
 * FreeRTOS+TCP Labs Build 150406 (C) 2015 Real Time Engineers ltd.
 * Authors include Hein Tibosch and Richard Barry
 *
 *******************************************************************************
 ***** NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE ***
 ***                                                                         ***
 ***                                                                         ***
 ***   FREERTOS+TCP IS STILL IN THE LAB:                                     ***
 ***                                                                         ***
 ***   This product is functional and is already being used in commercial    ***
 ***   products.  Be aware however that we are still refining its design,    ***
 ***   the source code does not yet fully conform to the strict coding and   ***
 ***   style standards mandated by Real Time Engineers ltd., and the         ***
 ***   documentation and testing is not necessarily complete.                ***
 ***                                                                         ***
 ***   PLEASE REPORT EXPERIENCES USING THE SUPPORT RESOURCES FOUND ON THE    ***
 ***   URL: http://www.FreeRTOS.org/contact  Active early adopters may, at   ***
 ***   the sole discretion of Real Time Engineers Ltd., be offered versions  ***
 ***   under a license other than that described below.                      ***
 ***                                                                         ***
 ***                                                                         ***
 ***** NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE ******* NOTE ***
 *******************************************************************************
 *
 * - Open source licensing -
 * While FreeRTOS+TCP is in the lab it is provided only under version two of the
 * GNU General Public License (GPL) (which is different to the standard FreeRTOS
 * license).  FreeRTOS+TCP is free to download, use and distribute under the
 * terms of that license provided the copyright notice and this text are not
 * altered or removed from the source files.  The GPL V2 text is available on
 * the gnu.org web site, and on the following
 * URL: http://www.FreeRTOS.org/gpl-2.0.txt.  Active early adopters may, and
 * solely at the discretion of Real Time Engineers Ltd., be offered versions
 * under a license other then the GPL.
 *
 * FreeRTOS+TCP is distributed in the hope that it will be useful.  You cannot
 * use FreeRTOS+TCP unless you agree that you use the software 'as is'.
 * FreeRTOS+TCP is provided WITHOUT ANY WARRANTY; without even the implied
 * warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. Real Time Engineers Ltd. disclaims all conditions and terms, be they
 * implied, expressed, or statutory.
 *
 * 1 tab == 4 spaces!
 *
 * http://www.FreeRTOS.org
 * http://www.FreeRTOS.org/plus
 * http://www.FreeRTOS.org/labs
 *
 */

/* Standard includes. */
#include <stdint.h>

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"

/* FreeRTOS+TCP includes. */
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_Sockets.h"
#include "NetworkBufferManagement.h"

/* Hardware includes. */
#include "hwEthernet.h"

/* Demo includes. */
#include "NetworkInterface.h"

#if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES != 1
	#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eProcessBuffer
#else
	#define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer ) eConsiderFrameForProcessing( ( pucEthernetBuffer ) )
#endif

/* When a packet is ready to be sent, if it cannot be sent immediately then the
task performing the transmit will block for niTX_BUFFER_FREE_WAIT
milliseconds.  It will do this a maximum of niMAX_TX_ATTEMPTS before giving
up. */
#define niTX_BUFFER_FREE_WAIT	( ( TickType_t ) 2UL / portTICK_PERIOD_MS )
#define niMAX_TX_ATTEMPTS		( 5 )

/* The length of the queue used to send interrupt status words from the
interrupt handler to the deferred handler task. */
#define niINTERRUPT_QUEUE_LENGTH	( 10 )

/*-----------------------------------------------------------*/

/*
 * A deferred interrupt handler task that processes
 */
extern void vEMACHandlerTask( void *pvParameters );

/*-----------------------------------------------------------*/

/* The queue used to communicate Ethernet events with the IP task. */
extern QueueHandle_t xNetworkEventQueue;

/* The semaphore used to wake the deferred interrupt handler task when an Rx
interrupt is received. */
SemaphoreHandle_t xEMACRxEventSemaphore = NULL;
/*-----------------------------------------------------------*/

BaseType_t xNetworkInterfaceInitialise( void )
{
BaseType_t xStatus, xReturn;
extern uint8_t ucMACAddress[ 6 ];

	/* Initialise the MAC. */
	vInitEmac();

	while( lEMACWaitForLink() != pdPASS )
    {
        vTaskDelay( 20 );
    }

	vSemaphoreCreateBinary( xEMACRxEventSemaphore );
	configASSERT( xEMACRxEventSemaphore );

	/* The handler task is created at the highest possible priority to
	ensure the interrupt handler can return directly to it. */
	xTaskCreate( vEMACHandlerTask, "EMAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
	xReturn = pdPASS;

	return xReturn;
}
/*-----------------------------------------------------------*/

BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer )
{
extern void vEMACCopyWrite( uint8_t * pucBuffer, uint16_t usLength );

	vEMACCopyWrite( pxNetworkBuffer->pucBuffer, pxNetworkBuffer->xDataLength );

	/* Finished with the network buffer. */
	vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );

	return pdTRUE;
}
/*-----------------------------------------------------------*/