Data Sheet

iEthernet

W5200

IP address. At this time, there is no need to get the destination hardware address

about destination A, B and C, and also ARP

is not occurred.

Note: Broadcast IP

=> The Broadcast IP address can be obtained by performing a bit-wise logical OR

operation between the bit complement of the subnet mask and the host’s IP address.

ex> If IP:”222.98.173.123” and the subnet mask:“255.255.255.0”, broadcast IP is

“222.98.173.255”

Description Decimal Binary

HOST IP 222.098.173.123

11011110.01100010.10101101.01111011

Bit Complement Subnet mask 000.000.000.255

00000000.00000000.00000000.11111111

Bitwise OR - -

Broadcast IP 222.098.173.255

11011110.01100010.10101101.11111111

SOCKET Initialization

For the UDP data communication, SOCKET initialization is required; it opens the

SOCKET. The SOCKET open process is as followed. At first, choose one SOCKET among

the 8 SOCKETS of W5200, then set the protocol mode (Sn_MR(P3:P0)) of the chosen

SOCKET and set the source port number Sn_PORT0 for communication. Finally, execute

the OPEN command. After the OPEN command, the state of Sn_SR is changed to

SOCK_UDP. Then the SOCKET initialization is complete.

{

START:

Sn_MR = 0x02; /* sets UDP mode */

Sn_PORT0 = source_port; /* sets source port number */

Sn_CR = OPEN; /* sets OPEN command */

/* wait until Sn_SR is changed to SOCK_UDP */

if (Sn_SR != SOCK_UDP) Sn_CR = CLOSE; goto START;

}

Check received data

Check the reception of UDP data from destination. User can also check for received

data via TCP communication. It is strongly recommended to use the second method

because of the same reasoning from TCP. Please refer to the “5.2.1.1 TCP SERVER”.

First method :

{

if (Sn_IR(RECV) == ‘1’) Sn_IR(RECV) = ‘1’; goto Receiving Process stage;