RE: [lwip-users] Problem with use DHCP and IP fixed

[Andrew Foster]

Diecol,

If I'm not mistaken you will need to leave both:

  #define LWIP_DHCP  1
  #define LWIP_UDP   1

This will allow you to make a runtime decision on what IP mode the user 
has enabled. Keep in mind, the underlying protocol for receiving DHCP 
packets is handled by the UDP portion of the lwIP stack (or at least 
that is the way I remember it). 

As for configuring your interface at runtime, look into lwiplib.h. It 
contains the structure, definitions and prototypes to configure your 
network interface for both modes.

Once you have assigned the proper parameters to the structure, you can 
call lwIPLib_Init(lwIPLib_IPInfo_t *pInitParams).

If you need to reconfigure call:
lwIPLib_NetworkConfigChange(
 unsigned long ulIPAddr,  // the new IP address to be used (static)
 unsigned long ulNetMask, // the new network mask to be used (static)
 unsigned long ulGWAddr,  // the new Gateway address to be used (static)
 unsigned long ulIPMode)  // the IP Address Mode

Hope this helps,

Andrew 


-----Original Message-----
From: Diecol [mailto:address@hidden 
Sent: Monday, December 20, 2010 13:11
To: address@hidden
Subject: [lwip-users] Problem with use DHCP and IP fixed


Hello there, 

I'm working with lwip on at91sam9260 board and I'm using Eclipse 
platform.
well, 

When I set at lwipopts.h like this:
                #define LWIP_DHCP  1
                #define LWIP_UDP    1
DHCP works fine..
And when I set like this:
                #define LWIP_DHCP  0
                #define LWIP_UDP    0
My Ip fixed works fine too..

But in my code, users can changed from ip fixed to dhcp on and 
contrariwise!

When I used uIP protocol, I just did like this:

uip_ipaddr_t ipaddr;
uip_ipaddr(ipaddr, 0, 0, 0, 0);
uip_sethostaddr(ipaddr);
uip_ipaddr(ipaddr, 0, 0, 0, 0);
uip_setdraddr(ipaddr);
uip_ipaddr(ipaddr, 0, 0, 0, 0);
uip_setnetmask(ipaddr);
uip_setethaddr(MacAddress);
dhcpc_init(MacAddress.addr, 6);
uip_restart();

And It worked..
But now, I needed to change to lwip and when I try to change the
configuration It didnt work!

Someone has any idea?

Thanks

Regards

Oliveira, Diego

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