W6100 datasheet(107/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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/* check SOCKET for UDPD Mode */

if(Sn_SR != SOCK_UDP) goto START;

}

 Received DATA?

Refer to 6.2.1 TCP SERVER: Received DATA?

 Receiving Process

UDP dual mode SOCKET can receive UDP4 / UDP6 packets from one or more destinations, and

the received data packets are stored in SOCKET n RX buffer with 'PACKET INFO’. HOST can know

the IP version, transmission method, and destination information of received data packet from

the 'PACKET INFO’.

HOST must read data from SOCKET n RX buffer in the format of Figure 24. If the received data

is fragmented or bigger than SOCKET n RX buffer free size, it is discarded.

Refer to Figure 24 and Table 4

{

/* extract upper 2 bytes in PACKINFO */

goto 6.2.1 TCP SERVER: Receiving Process with get_size = 2 bytes;

data_size = (destination_address[0] & “00000111” << 8) + destination_address[1];

check UDP4 or UDP6 DATA Packet, extract Destination IP, Port, Size in PACKE INFO

if(destination_address[0] & “10000000” == 0) /* UDP4 DATA Packet */

{

goto 6.2.1 TCP SERVER: Receiving Process with get_size = 6 bytes;

dest_ip[0:3] = destination_address[0:3];

dest_port = (destination_address[4] << 8) + destination_address[5];

}

else /* UDP6 DATA Packet */

{

goto 6.2.1 TCP SERVER: Receiving Process with get_size = 18 bytes;

dest_ip[0:15] = destination_address[0:15];

dest_port = (destination_address[16] << 8) + destination_address[17];

}

/* read UDP DATA */

W6100 Datasheet(PDF) 107 Page - WIZnet Co., Ltd