while(!(I_STATUS[0] & SSYS_INIT_OK));
}

/*
********************************************************************************
*               Subnet mask setup function
*
* Description : Subnet mask setup function
* Arguments   : addr - pointer having the value for setting up the Subnet Mask
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void setsubmask(u_char * addr)
{
	u_char i;

	for (i = 0; i < 4; i++) {
		*(SUBNET_MASK_PTR + i) = addr[i];
	}
}

/*
********************************************************************************
*               gateway IP setup function
*
* Description : gateway IP setup function
* Arguments   : addr - pointer having the value for setting up the gateway IP
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void setgateway(u_char * addr)
{
	u_char i;

	for (i = 0; i < 4; i++) {
		*(GATEWAY_PTR + i) = addr[i];
	}
}

/*
********************************************************************************
*               W3100A IP Address setup function
*
* Description : W3100A IP Address setup function
* Arguments   : addr - pointer having the value for setting up the source IP Address
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void setIP(u_char * addr)
{
	u_char i;

	for (i = 0; i < 4; i++) {
		*(SRC_IP_PTR + i) = addr[i];
	}
}

/*
********************************************************************************
*               MAC Address setup function
*
* Description : MAC Address setup function
* Arguments   : addr - pointer having the value for setting up the MAC Address
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void setMACAddr(u_char * addr)
{
	u_char i;

	for (i = 0; i < 6; i++) {
		*(SRC_HA_PTR + i) = addr[i];
	}
}

#ifdef __IP_RAW__
/*
********************************************************************************
*               Upper layer protocol setup function in IP RAW Mode
*
* Description : Upper layer protocol setup function in protocol field of IP header when
*                    developing upper layer protocol like ICMP, IGMP, EGP etc. by using IP Protocol
* Arguments   : s          - Channel number
*               ipprotocol - Upper layer protocol setting value of IP Protocol
*                            (Possible to use designated IPPROTO_ in header file)
* Returns     : None
* Note        : API Function
*                  This function should be called before calling socket() that is, before socket initialization.
********************************************************************************
*/
void setIPprotocol(SOCKET s, u_char ipprotocol)
{
	IP_PROTOCOL(s) = ipprotocol;
}
#endif


#ifdef	__OPT__

/*
********************************************************************************
*               TCP timeout setup function
*
* Description : TCP retransmission time setup function.
*     Timeout Interrupt occurs if the number of retransmission exceed the limit when establishing connection and data transmission. 
* Arguments   : val - Pointer having the value to setup timeout
*     Upper 2byte is for initial timeout, lower 1byte is for the number of retransmission by timeout
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void settimeout(u_char * val)
{
	u_char i;

	for (i = 0; i < 3; i++) {
		*(TIMEOUT_PTR + i) = val[i];
	}
}

/*
********************************************************************************
*               interrupt mask setup function
*
* Description : Interrupt mask setup function. Enable/Disable appropriate Interrupt.
* Arguments   : mask - mask value to setup ('1' : interrupt enable)
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void setINTMask(u_char mask)
{
	INTMASK = mask;
}

/*
********************************************************************************
*               TOS value setup function for TOS field of IP header
*
* Description : TOS value setup function for TOS field of IP header
* Arguments   : s   - channel number
*    tos - Valuse to setup for TOS field of IP Header
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void setTOS(SOCKET s, u_char tos)
{
	TOS(s) = tos;
}
#endif

/*
********************************************************************************
*               Initialization function to appropriate channel
*
* Description : Initialize designated channel and wait until W3100 has done.
* Arguments   : s - channel number
*               protocol - designate protocol for channel
*                          SOCK_STREAM(0x01) -> TCP.
*                          SOCK_DGRAM(0x02)  -> UDP.
*                          SOCK_IPL_RAW(0x03) -> IP LAYER RAW.
*                          SOCK_MACL_RAW(0x04) -> MAC LAYER RAW.
*               port     - designate source port for appropriate channel
*               flag     - designate option to be used in appropriate.
*                          SOCKOPT_BROADCAST(0x80) -> Send/receive broadcast message in UDP
*                          SOCKOPT_NDTIMEOUT(0x40) -> Use register value which designated TIMEOUT value
*                          SOCKOPT_NDACK(0x20)     -> When not using no delayed ack
*                          SOCKOPT_SWS(0x10)       -> When not using silly window syndrome
* Returns     : When succeeded : Channel number, failed :1
* Note        : API Function
********************************************************************************
*/
char socket(SOCKET s, u_char protocol, u_int port, u_char flag)
{
	u_char k;

	OPT_PROTOCOL(s) = protocol | flag;                // Designate socket protocol and option

	if (port != 0)                                    // setup designated port number
	 {
		k = (u_char)((port & 0xff00) >> 8);
		*(SRC_PORT_PTR(s)) = k;
		k = (u_char)(port & 0x00ff);
		*(SRC_PORT_PTR(s) + 1) = k;
	} 
	else                                              // Designate random port number which is managed by local when you didn't designate source port
	{
		Local_Port++;					
		*SRC_PORT_PTR(s) = (u_char)((Local_Port & 0xff00) >> 8);
		*(SRC_PORT_PTR(s) + 1) = (u_char)(Local_Port & 0x00ff);
	}

	I_STATUS[s] = 0;
	COMMAND(s) = CSOCK_INIT;                          // SOCK_INIT
	while (I_STATUS[s] == 0);                         // Waiting Interrupt to CSOCK_INIT

	if (!(I_STATUS[s] & SSOCK_INIT_OK)) return (-1);  // Error
	
	initseqnum(s);                                    // Use initial seq# with random number

	return	(s);
}

#ifdef	__TCP_CLIENT__
/*
********************************************************************************
*               Connection establishing function to designated peer.
*
* Description : This function establish a connection to the peer by designated channel,
*     and wait until the connection is established successfully. (TCP client mode)
* Arguments   : s    - channel number
*               addr - destination IP Address
*               port - destination Port Number
* Returns     : when succeeded : 1, failed : -1
* Note        : API Function
********************************************************************************
*/
char connect(SOCKET s, u_char * addr, u_int port)
{
	if (port != 0) 
	{                                                           // designate destination port
		*DST_PORT_PTR(s) = (u_char)((port & 0xff00) >> 8);
		*(DST_PORT_PTR(s) + 1) = (u_char)(port & 0x00ff);
	}
	else    return (-1);

	*DST_IP_PTR(s) = addr[0];                                   // designate destination IP address
	*(DST_IP_PTR(s) + 1) = addr[1];
	*(DST_IP_PTR(s) + 2) = addr[2];        
	*(DST_IP_PTR(s) + 3) = addr[3];

	I_STATUS[s] = 0;

	COMMAND(s) = CCONNECT;                                      // CONNECT

	
	while (I_STATUS[s] == 0)                                    // Wait until connection is established successfully
		if (select(s, SEL_CONTROL) == SOCK_CLOSED) return -1;   // When failed, appropriate channel will be closed and return an error

	if (!(I_STATUS[s] & SESTABLISHED)) return (-1);             // Error

    return	(1);
}
#endif

#ifdef	__TCP_SERVER__
/*
********************************************************************************
*               Waits for connection request from a peer (Blocking Mode)
*
* Description : Wait for connection request from a peer through designated channel (TCP Server mode)
* Arguments   : s    - channel number
*               addr - IP Address of the peer when a connection is established
*               port - Port number of the peer when a connection is established 
* Returns     : When succeeded : 1, failed : -1
* Note        : API Function
********************************************************************************
*/
/*
char listen(SOCKET s, u_char * addr, u_int * port)
{
	u_int i;

	I_STATUS[s] = 0;

	COMMAND(s) = CLISTEN;                                       // LISTEN

	while (I_STATUS[s] == 0)                                    // Wait until connection is established
	    if (select(s, SEL_CONTROL) == SOCK_CLOSED) return -1;   // When failed to connect, the designated channel will be closed and return an error.

	if (I_STATUS[s] & SESTABLISHED)                             // Receive IP address and port number of the peer connected
	{ 
		i = *DST_PORT_PTR(s);
		*port = (u_int)((i & 0xff00) >> 8);
		i = *(DST_PORT_PTR(s) + 1);
		i = (u_int)(i & 0x00ff);
		*port += (i << 8);

		addr[0] = *DST_IP_PTR(s);
		addr[1] = *(DST_IP_PTR(s) + 1);
		addr[2] = *(DST_IP_PTR(s) + 2);
		addr[3] = *(DST_IP_PTR(s) + 3);
	} 
	else	return (-1);                                        // Error

	return (1);
}
*/

/*
********************************************************************************
*              Waits for connection request from a peer (Non-blocking Mode)
*
* Description : Wait for connection request from a peer through designated channel (TCP Server mode)
* Arguments   : s - channel number
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void NBlisten(SOCKET s)
{
	I_STATUS[s] = 0;
	COMMAND(s) = CLISTEN;         // LISTEN
}
#endif

/*
********************************************************************************
*               Create random value for initial Seq# when establishing TCP connection
*
* Description : In this function, you can add some source codes to create random number for initial Seq#
*     In real, TCP initial SEQ# should be random value. 
*               (Currently, we're using static value in EVB/DK.)
* Arguments   : s - channel number
* Returns     : None
* Note        : API Function
********************************************************************************
*/
void initseqnum(SOCKET s)
{
	int i;

	i = s;

	SEQ_NUM.lVal++;     // Designate initial seq#
                            // If you have random number generation function, assign random number instead of SEQ_NUM.lVal++.

	*TX_WR_PTR(s)	    = SEQ_NUM.cVal[0];
	*(TX_WR_PTR(s) + 1) = SEQ_NUM.cVal[1];
	*(TX_WR_PTR(s) + 2) = SEQ_NUM.cVal[2];
	*(TX_WR_PTR(s) + 3) = SEQ_NUM.cVal[3];
	wait_1us(2);	    // Wait until TX_WR_PRT has been written safely. ( Must have delay(1.6us) if next action is to write 4byte-pointer register )

	*TX_RD_PTR(s)	    = SEQ_NUM.cVal[0];
	*(TX_RD_PTR(s) + 1) = SEQ_NUM.cVal[1];
	*(TX_RD_PTR(s) + 2) = SEQ_NUM.cVal[2];
	*(TX_RD_PTR(s) + 3) = SEQ_NUM.cVal[3];
	wait_1us(2);	    // Wait until TX_RD_PRT has been written safely.

	*TX_ACK_PTR(s)	     = SEQ_NUM.cVal[0];
	*(TX_ACK_PTR(s) + 1) = SEQ_NUM.cVal[1];
	*(TX_ACK_PTR(s) + 2) = SEQ_NUM.cVal[2];
	*(TX_ACK_PTR(s) + 3) = SEQ_NUM.cVal[3];
}

#ifdef	__TCP__
/*
********************************************************************************
*               Function for sending TCP data.
*
* Description : Function for sending TCP data and Composed of the send() and send_in() functions.
*     The send() function is an application I/F function.
*     It continues to call the send_in() function to complete the sending of the data up to the size of the data to be sent