LWIP学习系列（二）：STM32中ETH外设的配置与LWIP的结合使用_stm32 leip low_level_input()(2)

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netif->name[1] = IFNAME1;
/* We directly use etharp_output() here to save a function call.

• You can instead declare your own function an call etharp_output()
• from it if you have to do some checks before sending (e.g. if link
• is available…) */

#if LWIP_IPV4
#if LWIP_ARP || LWIP_ETHERNET
#if LWIP_ARP
netif->output = etharp_output;
#else
/* The user should write ist own code in low_level_output_arp_off function /
netif->output = low_level_output_arp_off;
#endif / LWIP_ARP /
#endif / LWIP_ARP || LWIP_ETHERNET /
#endif / LWIP_IPV4 */

#if LWIP_IPV6
netif->output_ip6 = ethip6_output;
#endif /* LWIP_IPV6 */

netif->linkoutput = low_level_output;

/* initialize the hardware */
low_level_init(netif);

return ERR_OK;
}

* 由**lwip官方**下载的示例代码

err_t
ethernetif_init(struct netif *netif)
{
struct ethernetif *ethernetif;

LWIP_ASSERT(“netif != NULL”, (netif != NULL));

ethernetif = mem_malloc(sizeof(struct ethernetif));
if (ethernetif == NULL) {
LWIP_DEBUGF(NETIF_DEBUG, (“ethernetif_init: out of memory\n”));
return ERR_MEM;
}

#if LWIP_NETIF_HOSTNAME
/* Initialize interface hostname /
netif->hostname = “lwip”;
#endif / LWIP_NETIF_HOSTNAME */

/*

• Initialize the snmp variables and counters inside the struct netif.
• The last argument should be replaced with your link speed, in units
• of bits per second.
  */
  MIB2_INIT_NETIF(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);

netif->state = ethernetif;
netif->name[0] = IFNAME0;
netif->name[1] = IFNAME1;
/* We directly use etharp_output() here to save a function call.

• You can instead declare your own function an call etharp_output()
• from it if you have to do some checks before sending (e.g. if link
• is available…) /
  #if LWIP_IPV4
  netif->output = etharp_output;
  #endif / LWIP_IPV4 /
  #if LWIP_IPV6
  netif->output_ip6 = ethip6_output;
  #endif / LWIP_IPV6 */
  netif->linkoutput = low_level_output;

ethernetif->ethaddr = (struct eth_addr *) & (netif->hwaddr[0]);

/* initialize the hardware */
low_level_init(netif);

return ERR_OK;
}

**小结：**由上面两种程序对比，可以看出大同小异。基本上都是对**netif 网卡结构体进行赋值**，然后**真正的初始化**交由**low\_level\_init**来进行。


#### （3）**