LWIP initialization Process

You should first look at the Doc/rawapi.txt in the source package, which describes the initialization process.

The first half of the initialization process is mainly for LWIP memory management and each protocol layer, in src/core/init.c there is a lwip_init () function has been done for us, directly call it;

The second half of the initialization process initializes the network interface, calling the following function in turn:

Netif_add (multiple calls are required if there is more than one interface)

Netif_set_default

Netif_set_up

Dhcp_start

When calling the Netif_add function we need to provide an INIT function pointer, which points to our own hardware interface initialization function, which is generally the ethernetif_init () in ETHERNETIF.C.

LWIP initialization Process