EVB-PIC24 WIZnet, EVB-PIC24 Datasheet - Page 78

• 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

getIP_DHCPS(), it initializes iinChip™ using setSIPR(),setSHAR(),and etc. And then 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 it‟s defines at
„MAX_DHCP_RETRY.‟ While waiting for „DHCP_WAIT_TIME x MAX_DHCP_RETRY‟ time it continuously
checks if dhcp_state is changed to STATE_DHCP_LEASED through check_DHCP_state().
RETURN Success
N
dhcp_state != STATE_DHCP_LEASED
dhcp_state = STATE_DHCP_DISCOVER
Assign a random integer to DHCP_XID
GET_SIP = 0x00000000
GET_GW_IP = 0x00000000
GET_SN_MASK = 0x00000000
Set iinChip
Reset timeout value & retry count
Initialize DHCP Client Variables
setSHAR(SRC_MAC_ADDR)
Set iinChip
send_DHCP_DISCOVER()
DHCP_XID = 0x12345678
Set Timer for DHCP Client
iinChip
Find a DHCP Server
reset_DHCP_time()
setSIPR(GET_SIP)
DHCP_Timeout = 0
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sysinit(0x55,0x55)
Initialize iinChip
getIP_DHCPS()
TM
set_timer(1s)
iinchip_init()
TM
's IP Address to 0.0.0.0
TM
System Initialize
’s MAC Address
N
TM
<Fig 3.29: getIP_DHCPS()>
Y
dhcp_state = check_DHCP_state()
DHCP_Timeout == 1
Check dhcp_state
N
Y
Kill Timer for DHCP Client
RETURN Fail
kill_timer()
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