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 *         ATMEL Microcontroller Software Support 
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 * Copyright (c) 2008, Atmel Corporation
 *
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// peripherals/emac/emac.h

#ifndef EMAC_H
#define EMAC_H

//-----------------------------------------------------------------------------
/// \dir
/// !Purpose
///
///     Definition of methods and structures for using EMAC
///     
/// !Usage
///
/// -# Initialize EMAC with EMAC_Init.
/// -# Setup EMAC with EMAC_SetupTx, EMAC_SetupRx, EMAC_SetupMacAddress
///    and EMAC_SetupStack. 
/// -# Drive the EMAC status machine by EMAC_Task.
/// -# EMAC_GetStatus give EMAC status machine current status 
/// -# Send a packet to network with EMAC_SendPacket.
/// -# Get a packet from network with EMAC_GetPacket.
///
//-----------------------------------------------------------------------------


//-----------------------------------------------------------------------------
//         Headers
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
//         Definitions
//-----------------------------------------------------------------------------
/// Number of buffer for RX, be carreful: MUST be 2^n
#define RX_BUFFERS  16
/// Number of buffer for TX, be carreful: MUST be 2^n
#define TX_BUFFERS   8

/// Buffer Size
#define EMAC_RX_UNITSIZE            128     /// Fixed size for RX buffer
#define EMAC_TX_UNITSIZE            1518    /// Size for ETH frame length

// The MAC can support frame lengths up to 1536 bytes.
#define EMAC_FRAME_LENTGH_MAX       1536


//-----------------------------------------------------------------------------
//         Types
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
/// Describes the statistics of the EMAC.
//-----------------------------------------------------------------------------
typedef struct _EmacStats {

    // TX errors
    unsigned int tx_packets;    /// Total Number of packets sent
    unsigned int tx_comp;       /// Packet complete
    unsigned int tx_errors;     /// TX errors ( Retry Limit Exceed )
    unsigned int collisions;    /// Collision
    unsigned int tx_exausts;    /// Buffer exhausted
    unsigned int tx_underruns;  /// Under Run, not able to read from memory
    // RX errors
    unsigned int rx_packets;    /// Total Number of packets RX
    unsigned int rx_eof;        /// No EOF error
    unsigned int rx_ovrs;       /// Over Run, not able to store to memory
    unsigned int rx_bnas;       /// Buffer is not available

} EmacStats, *PEmacStats;

//-----------------------------------------------------------------------------
//         PHY Exported functions
//-----------------------------------------------------------------------------
extern unsigned char EMAC_SetMdcClock( unsigned int mck );

extern void EMAC_EnableMdio( void );

extern void EMAC_DisableMdio( void );

extern void EMAC_EnableMII( void );

extern void EMAC_EnableRMII( void );

extern unsigned char EMAC_ReadPhy(unsigned char PhyAddress,
                                  unsigned char Address,
                                  unsigned int *pValue,
                                  unsigned int retry);

extern unsigned char EMAC_WritePhy(unsigned char PhyAddress,
                                   unsigned char Address,
                                   unsigned int Value,
                                   unsigned int retry);

extern void EMAC_SetLinkSpeed(unsigned char speed,
                              unsigned char fullduplex);

//-----------------------------------------------------------------------------
//         EMAC Exported functions
//-----------------------------------------------------------------------------
/// Callback used by send function
typedef void (*EMAC_TxCallback)(unsigned int status);
typedef void (*EMAC_RxCallback)(unsigned int status);
typedef void (*EMAC_WakeupCallback)(void);

extern void EMAC_Init( unsigned char id, const unsigned char *pMacAddress,
                unsigned char enableCAF, unsigned char enableNBC );
#define EMAC_CAF_DISABLE  0
#define EMAC_CAF_ENABLE   1
#define EMAC_NBC_DISABLE  0
#define EMAC_NBC_ENABLE   1

extern void EMAC_Handler(void);

extern unsigned char EMAC_Send(void *pBuffer, 
                               unsigned int size, 
                               EMAC_TxCallback fEMAC_TxCallback);
/// Return for EMAC_Send function
#define EMAC_TX_OK                     0
#define EMAC_TX_BUFFER_BUSY            1
#define EMAC_TX_INVALID_PACKET         2


extern unsigned char EMAC_Poll(unsigned char *pFrame,
                               unsigned int frameSize,
                               unsigned int *pRcvSize);
/// Return for EMAC_Poll function
#define EMAC_RX_OK                   0
#define EMAC_RX_NO_DATA              1
#define EMAC_RX_FRAME_SIZE_TOO_SMALL 2

extern void EMAC_GetStatistics(EmacStats *pStats, unsigned char reset);

#endif // #ifndef EMAC_H