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5.2.3 IPRAW

IPRAW is data communication using TCP, UDP, and IP layers, which are the lower protocol

layers. IPRAW supports IP layer protocol such as ICMP (0x01) and IGMP (0x02) according

to the protocol number. The ‘ping’ of ICMP or IGMP v1/v2 is already included in W5200

by hardware logic. But if the user needs, the host can directly process the IPRAW by

opening the Socket n to IPRAW. In the case of using IPRAW mode, user must set the

protocol number field of the IP header to what the user wants to use. The protocol

number

defined

IANA.

Refer

the

web

(

http://www.iana.org

/assignments/protocol-numbers

). The protocol number must be configured to

Sn_PROTO before ‘SOCKET open.’ In IPRAW mode, W5200 does not support TCP (0x06)

or UDP (0x11) protocol number. The SOCKET communication of IPRAW mode only allows

the communication of an assigned protocol number. The ICMP SOCKET cannot receive

unassigned protocol data except assigned protocol data such as IGMP.

Figure 14 IPRAW Operation Flow

SOCKET Initialization

Select the SOCKET and set the protocol number. Then set the Sn_MR(P3:P0) to IPRAW

mode and execute ‘OPEN’ command. If the Sn_SR is changed to SOCK_IPRAW after the

‘OPEN’ command, the SOCKET initialization is completed.

{

START:

/* sets Protocol number */

/* The protocol number is used in Protocol Field of IP Header. */

Sn_PROTO = protocol_num;

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