static/DHCP networking with LWIP

[alanb]

I generally want to support both static/auto/dhcp in software config. This is most easily done by changing LWIP.c

Around line 62:

/* IP addresses initialization with DHCP (IPv4) */
ipaddr.addr = gstate.ipaddr; // NOT 0
netmask.addr = gstate.netmask; // NOT 0
gw.addr = gstate.gwaddr; // NOT 0

Around 92

 if (gstate.dhcp) {
  dhcp_start(&gnetif);
  }
  else
  {
   ipaddr.addr = gstate.ipaddr;
   netmask.addr = gstate.netmask;
   gw.addr = gstate.gwaddr;
   dhcp_stop(&gnetif);
   netif_set_down(&gnetif);

   netif_set_addr(&gnetif, &ipaddr, &netmask, &gw);

   if (netif_is_link_up(&gnetif))
       {
       /* When the netif is fully configured this function must be called */
       netif_set_up(&gnetif);
   }
  }

However such changed keep getting trampled on by code generation when I update STM32Cube. Is there any way to protect changes so they don't get overwritten?

I appreciate that to support either Static or DHCP this is a config option in the code generator, but I generally want to support everything I can!

Alan

[Pavel A.]

A good idea, but should be more or less easy to do this with the "user code areas"  and ifdefs.

[alanb]

It _so nearly_ is, but unfortunately the call to 

 dhcp_start(&gnetif);

is just before the /* USER CODE BEGIN 3 */

block which makes it hard to bypass and the init of ipaddr/netmask/gwneeds to be done before this and there isn't a user code block available.

Alan

[Pavel A.]

// something like this ...
#ifdef USE_STATIC
#define dhcp_start(x) /*nothing*/
#endif