[lwip-users] Lwip 1.4.1 initialization

[Keith Rubow]

I am trying to use LwIP for the first time, and am having trouble 
figuring out what I need to do to properly initialize it.

I am trying to run LwIP version 1.4.1 on an STM23F427 Arm processor, but 
I am NOT using the on-chip ethernet interface. I am using it with a 
Wiznet W810MJ ethernet module in mac-raw mode. I wish to use the netconn 
api in a multi-threaded system. My operating system is a very simple 
cooperative multitasking system with no preemption and no task priorities.

So far I have implemented the sys_arch with semaphores, mailboxes, 
thread creation and sys_now. I have also written the basic low level 
driver interface for my Wiznet ethernet module, including hardware 
iniitialization and sending/receiving ethernet frames. For this I 
followed the "skeleton" driver sample code.

Now I am trying to get LwIP 1.4.1 initialized. I am doing the following:

tcp_init(NULL,NULL);
netif_add(&wiznetif,&ipaddr,&netmask,&gateway,NULL,&ethernetif_init,&tcpip_input);

Where wiznetif is a netif struct, and the IP addresses are initiallized 
to my desired static IP, netmask and gateway. When I run my code, I get 
as far as calling netif_add, but netif_add never returns. It seems to be 
hung in sys_arch_mbox_fetch where it is waiting for a message to be 
posted to a mailbox. The mailbox is empty, and nothing is getting posted 
to it, which is not surprising since the only LwIP related thread 
running is the tcp_ip thread.

I suspect I am doing something wrong in my initialization sequence. Can 
someone give me a hint/clue/example of how to initialize LwIP 1.4.1 in a 
simple multi-threaded environment?

Keith