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void eth_init();

void eth_interrupt();

void eth_recv_ack(void);

int eth_send(int length);   //return (-1) or length (still processing previous) or asserted

#define ETH_MODER               0x00

#define ETH_INT_SOURCE      0x04

#define ETH_INT_MASK        0x08

#define ETH_IPGT                0x0C

#define ETH_IPGR1               0x10

#define ETH_IPGR2               0x14

#define ETH_PACKETLEN       0x18

#define ETH_COLLCONF        0x1C

#define ETH_TX_BD_NUM       0x20

#define ETH_CTRLMODER       0x24

#define ETH_MIIMODER        0x28

#define ETH_MIICOMMAND          0x2C

#define ETH_MIIADDRESS      0x30

#define ETH_MIITX_DATA      0x34

#define ETH_MIIRX_DATA      0x38

#define ETH_MIISTATUS       0x3C

#define ETH_MAC_ADDR0       0x40

#define ETH_MAC_ADDR1       0x44

#define ETH_HASH0_ADR       0x48

#define ETH_HASH1_ADR       0x4C

#define ETH_TXCTRL              0x50

#define ETH_TXBD0H              0x404

#define ETH_TXBD0L              0x400

#define ETH_RXBD0H              0x604   //this depends on TX_BD_NUM but this is the standard value

#define ETH_RXBD0L              0x600   //this depends on TX_BD_NUM but this is the standard value

//MODER BITS

#define ETH_RECSMALL        0x00010000

#define ETH_PAD                 0x00008000

#define ETH_HUGEN               0x00004000

#define ETH_CRCEN               0x00002000

#define ETH_DLYCRCEN        0x00001000

#define ETH_FULLD               0x00000400

#define ETH_EXDFREN             0x00000200

#define ETH_NOBCKOF             0x00000100

#define ETH_LOOPBCK             0x00000080

#define ETH_IFG                 0x00000040

#define ETH_PRO                 0x00000020

#define ETH_IAM                 0x00000010

#define ETH_BRO                 0x00000008

#define ETH_NOPRE               0x00000004

#define ETH_TXEN                0x00000002

#define ETH_RXEN                0x00000001

//INTERRUPTS BITS

#define ETH_RXC                 0x00000040

#define ETH_TXC                 0x00000020

#define ETH_BUSY                0x00000010

#define ETH_RXE                 0x00000008

#define ETH_RXB                 0x00000004

#define ETH_TXE                 0x00000002

#define ETH_TXB                 0x00000001

//BUFFER DESCRIPTOR BITS

#define ETH_RXBD_EMPTY      0x00008000

#define ETH_RXBD_IRQ        0x00004000

#define ETH_RXBD_WRAP       0x00002000

#define ETH_RXBD_CF             0x00000100

#define ETH_RXBD_MISS       0x00000080

#define ETH_RXBD_OR             0x00000040

#define ETH_RXBD_IS             0x00000020

#define ETH_RXBD_DN             0x00000010

#define ETH_RXBD_TL             0x00000008

#define ETH_RXBD_SF             0x00000004

#define ETH_RXBD_CRC        0x00000002

#define ETH_RXBD_LC             0x00000001

#define ETH_TXBD_READY      0x00008000

#define ETH_TXBD_IRQ        0x00004000

#define ETH_TXBD_WRAP       0x00002000

#define ETH_TXBD_PAD        0x00001000

#define ETH_TXBD_CRC        0x00000800

#define ETH_TXBD_UR             0x00000100

#define ETH_TXBD_RL             0x00000008

#define ETH_TXBD_LC             0x00000004

#define ETH_TXBD_DF             0x00000002

#define ETH_TXBD_CS             0x00000001

//user defines

#define OWN_MAC_ADDRESS_5       0x55

#define OWN_MAC_ADDRESS_4       0x47

#define OWN_MAC_ADDRESS_3       0x34

#define OWN_MAC_ADDRESS_2       0x22

#define OWN_MAC_ADDRESS_1       0x88

#define OWN_MAC_ADDRESS_0       0x92

#define BROADCAST_ADDRESS_5     0xFF

#define BROADCAST_ADDRESS_4     0xFF

#define BROADCAST_ADDRESS_3     0xFF

#define BROADCAST_ADDRESS_2     0xFF

#define BROADCAST_ADDRESS_1     0xFF

#define BROADCAST_ADDRESS_0     0xFF

#define HDR_LEN       14

#define CRC_LEN       4

#define BD_SND  ( ETH_TXBD_READY | ETH_TXBD_IRQ | ETH_TXBD_WRAP | ETH_TXBD_PAD | ETH_TXBD_CRC )

#define RX_READY    ( ETH_RXBD_EMPTY | ETH_RXBD_IRQ | ETH_RXBD_WRAP )

#define TX_READY ( ETH_TXBD_IRQ | ETH_TXBD_WRAP | ETH_TXBD_PAD | ETH_TXBD_CRC )

//~user defines