EVB-PIC24 WIZnet, EVB-PIC24 Datasheet - Page 80

• Manufacturer Part Number: EVB-PIC24
• Description: Development Boards & Kits - PIC / DSPIC W3150A+EVAL BOARD BASED ON PIC24
• Manufacturer: WIZnet

Specifications of EVB-PIC24

• Rohs: yes
• Product: Development Kits
• Interface Type: RS-232
• Data Bus Width: 16 bit
• Dimensions: 50 mm x 40 mm

Third, management of Network Information obtained from DHCP server can be performed by
check_DHCP_state().<Fig 3.30> shows DHCP message flow due to DHCP client state change in the
check_DHCP_state() process.
check_DHCP_state() checks if there is DHCP message from DHCP server, it receives and analyze DHCP
message. By types of analyzed DHCP message, if it‟s DHCP message that can be receivable, it changes to
next state after it changes DHCP Client State as DHCP Message Flow of <Fig 3.30> indicates.
After the half of leased time
STATE_DHCP_REREQUEST
STATE_DHCP_DISCOVER
STATE_DHCP_DISCOVER
STATE_DHCP_REQUEST
STATE_DHCP_REQUEST
#define DHCP_FLAGSBROADCAST
pRIPMSG->flags = htons(DHCP_FLAGSBROADCAST);
STATE_DHCP_LEASED
STATE_DHCP_LEASED
Receive Timeout
Receive Timeout
<Fig 3.30: DHCP Message Flow by DHCP Client State>
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<Table 3-35: DHCP Message Flag Field Setup>
DHCP Client
DHCP_REQUEST (Unicast)
DHCP_DISCOVER
DHCP_DISCOVER
DHCP_REQUEST
DHCP_REQUEST
DHCP_DISCOVER
DHCP_REQUEST
0x8000
DHCP_OFFER
DHCP_OFFER
DHCP_NACK
DHCP_ACK
DHCP_ACK
DHCP Server
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