// the key API for the NIC - encapsulates NIC specific functionality
//
// echo_packet(unsigned int length,unsigned char *packet) - sends packet to NIC
// ignoreFrame() - does what it says
// getPacket(unsigned int maxLength,unsigned char *packet) - gets data into packet from NIC up to maxLength, bytes returns length
// initNIC(unsigned char *macAddress) - does what it says
// unsigned char dataToRead() - returns 1 if there's a packet waiting to be read, 0 otherwise
// waitToTransmit() - wait until the NIC is free to send a packet

void echo_packet(unsigned int,unsigned char *);
void ignoreFrame(void);
unsigned int getPacket(unsigned int,unsigned char *);
void initNIC(const rom unsigned char *);  // initialise NIC with MAC address as argument
unsigned char dataToRead(void);
void waitToTransmit(void);