W5100E01-AVR WIZnet, W5100E01-AVR Datasheet - Page 63

• Manufacturer Part Number: W5100E01-AVR
• Description: Development Boards & Kits - AVR W5100 EVAL BOARD BASED ON AVR
• Manufacturer: WIZnet

Specifications of W5100E01-AVR

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: ATMEGA128
• Core: AVR8
• Interface Type: LAN, RS-232
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 bit

3.2.6.3.
Loopback UDP Program is a program that uses unicast datagram communication of UDP protocol. It
operates same as Loopback TCP Server/Client program does. UDP communication includes unicast
datagram communication and broadcast datagram communication, and basically supports 1-to-many
communication that is used for many destinations with one channel.
Loopback UDP program uses loopback_udp() and <Fig 3-16> shows processing procedure of
loopback_udp().
u_char * data_buf = TX_BUF
u_long destip = 0
u_int destport = 0
Declare & Initialize Local Variables
Select Socket Status
SOCK_CLOSED
loopback_udp()
SOCK_UDP?
SOCK_INIT?
getSn_SR()
Loopback UDP
?
N
N
Y
Y
Y
© Copyright 2007 WIZnet Co., Inc. All rights reserved.
socket(ch,SOCK_DGRAM,port,flag)
len = getSn_RX_RSR()
Select Recieved Size
Create a TCP Socket
RETURN
<Fig 3.16: loopback_udp()>
len > 0
N
Y
recvfrom(ch,data_buf,len,&destip,&destport)
sendto(ch,data_buf,len,destip,destport)
Send the Received Data
Receive the Data
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