/*
 * FreeRTOS+TCP V2.0.1
 * 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://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */

/* 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;
}
/*-----------------------------------------------------------*/