W5100 datasheet(52/72 Pages) WIZNET

Part #	W5100

Description	Single-chip Internet-enabled 10/100 Ethernet Controller

PDF	72 Pages

Scroll/Zoom	100%

Manufacturer	WIZNET [WIZnet Co., Ltd]

Direct Link	https://www.wiznet.io/ko/Product/

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52 / 72 page

5.2.2 UDP

UDP provides unreliable and connectionless datagram transmission structure. It processes

data without connection establishment. Therefore, UDP message can be lost, overlapped or

reversed. As packets can arrive faster, recipient can not process all of them. In this case, user

application should guarantee the reliability of data transmission. UDP transmission can be

processed as below,

◼

Socket Initialization

Initialize the socket n as UDP.

{

START:

/* sets UDP mode */

Sn_MR = 0x02;

/* sets source port number */

/* ※ The value of Source Port can be appropriately delivered when remote HOST knows it. */

Sn_PORT = source_port;

/* sets OPEN command */

Sn_CR = OPEN;

/* Check if the value of Socket n Status Register(Sn_SR) is SOCK_UDP. */

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

}

W5100 Datasheet(PDF) 52 Page - WIZnet Co., Ltd