W6100 datasheet(90/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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if( send_size > gSn_TX_MAX ) send_size = gSn_TX_MAX;

while(send_size > Sn_TX_FSR); // wait until SOCKET n TX Buffer is free */

/* If you don’t want to wait TX Buffer Free

send_size = Sn_TX_FSR; // write DATA as Size of Free Buffer

/* calculate Write Offset Address */

get_start_address = Sn_TX_WR;

/* copy get_size of get_start_address to destination_address */

memcpy(get_start_address, destination_address, send_size);

/* increase Sn_TX_WR as send_size */

Sn_TX_WR += send_size;

/* set SEND and SEND6 Command in each TCP and TCP6 Mode */

Sn_CR = SEND; /* set SEND command in TCP Mode */

while(Sn_CR != 0x00); /* wait until SEND or SEND6 Command is cleared */

/* wait until SEND or SEND6 Command is completed or Timeout is occurred */

while(Sn_IR[SENDOK] == ‘0’ and Sn_IR[TIMEOUT] = ‘0’);

/* clear SOCKET Interrupt*/

if(Sn_IR[SENDOK] == ‘1’) Sn_IRCLR[SENDOK] = ‘1’;

else

goto Timeout?;

}

 Received FIN (Passive Close)

This is the passive close process.

When W6100 receives FIN packet from peer, Sn_IR[DISCON] interrupt occurs and Sn_SR value

will change to SOCK_CLOSE_WAIT.

First Method:

{

If(Sn_SR == SOCK_CLOSE_WAIT) goto Disconnecting Process;

}

Second Method:

{

If(Sn_IR[DISCON] == ‘1’) goto Disconnecting Process;

W6100 Datasheet(PDF) 90 Page - WIZnet Co., Ltd