EVB-B1+ WIZnet, EVB-B1+ Datasheet - Page 81

• Manufacturer Part Number: EVB-B1+
• Description: Development Boards & Kits - ARM W3150A+EVAL BOARD BASED ON AVR
• Manufacturer: WIZnet

Specifications of EVB-B1+

• Rohs: yes
• Product: Evaluation Boards
• Interface Type: RS-232, SPI
• Operating Supply Voltage: 3.3 V, 5 V
• Data Bus Width: 8 bit
• Dimensions: 50 mm x 40 mm
• Processor Series: ATmega128

<Fig 3.29: getIP_DHCPS()>
+
getIP_DHCPS() initializes W3150A
using setIP(),setMACAddr(),and etc, and it initializes ‘dhcp_state’
variable as DHCP client program state to ‘STATE_DHCP_DISCOVER’. After the initialization, it calls
send_DHCP_DISCOVER() to transfer a DHCP DISCOVERY message to DHCP server.
After transmitting DISCOVERY DHCP message, it initializes timer variables which are the leased time of
network information received from DHCP server by calling reset_DHCP_time() and uses ‘DHCP Timer’ for 1-
sec interval using set_timer(). After the initialization of DHCP_Timeout with 0, it waits for DHCP message to
be received from DHCP server as long as the ‘DHCP_WAIT_TIME’ defines and as many as the
‘MAX_DHCP_RETRY’defines. While waiting for ‘DHCP_WAIT_TIME & MAX_DHCP_RETRY’ time, it
continuously checks if dhcp_state is changed to STATE_DHCP_LEASED through check_DHCP_state().
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