RTT LWIP初始化问题

发布于 2016-05-04 11:08:00 浏览：2871 订阅该版

在TCPIP回调函数中，如果netif_set_link_up(ethif->netif); 这个函数不注释掉，就会导致程序有时候会跑不起来，初始化完成不了，注释掉以后就没有问题，请问这个函数不是应该在连接状态改变时才调用的么，为什么在初始化时也需要调用，下面是我的程序代码，请多多指教
```static void tcpip_init_done_callback(void *arg)
{
	rt_device_t device;
	struct eth_device *ethif;
	struct ip_addr ipaddr, netmask, gw;
	struct rt_list_node* node;
	struct rt_object* object;
	struct rt_object_information *information;

extern struct rt_object_information rt_object_container[];

LWIP_ASSERT("invalid arg.
",arg);

IP4_ADDR(&gw, 0,0,0,0);
	IP4_ADDR(&ipaddr, 0,0,0,0);
	IP4_ADDR(&netmask, 0,0,0,0);

/* enter critical */
	rt_enter_critical();

/* for each network interfaces */
	information = &rt_object_container[RT_Object_Class_Device];
	for (node = information->object_list.next; node != &(information->object_list); node = node->next)
	{
		object = rt_list_entry(node, struct rt_object, list);
		device = (rt_device_t) object;
		if (device->type == RT_Device_Class_NetIf)
		{
			ethif = (struct eth_device*)device;

/* leave critical ?????÷?????ò*/
			rt_exit_critical();

netif_add(ethif->netif, &ipaddr, &netmask, &gw, 
				ethif, netif_device_init, tcpip_input);

if (netif_default == RT_NULL)
				netif_set_default(ethif->netif);

#if LWIP_DHCP
			dhcp_start(ethif->netif);
#else
			netif_set_up(ethif->netif);
#endif

#ifdef LWIP_NETIF_LINK_CALLBACK
			//netif_set_link_up(ethif->netif);   //20160503
#endif

/* enter critical ???¨?÷?????ò*/
			rt_enter_critical();
		}
	}

/* leave critical */
	rt_exit_critical();

rt_sem_release((rt_sem_t)arg);
}
void lwip_system_init(void)
{
	rt_err_t rc;
	struct rt_semaphore done_sem;
	struct ip_addr ipaddr, netmask, gw;
	
	rc = rt_sem_init(&done_sem, "done", 0, RT_IPC_FLAG_FIFO);
	
	if(rc != RT_EOK)
	{
    	LWIP_ASSERT("Failed to create semaphore", 0);
		return;
	}

tcpip_init(tcpip_init_done_callback,(void *)&done_sem);		//?????????? ???¨????????

/* waiting for initialization done */
	if (rt_sem_take(&done_sem, RT_WAITING_FOREVER) != RT_EOK)
	{
		rt_sem_detach(&done_sem);
		return;
	}
	rt_sem_detach(&done_sem);

/*?????è??ip */
	IP4_ADDR(&ipaddr, RT_LWIP_IPADDR0, RT_LWIP_IPADDR1, RT_LWIP_IPADDR2, RT_LWIP_IPADDR3);		//?è??IP???· 192.168.1.199
	IP4_ADDR(&gw, RT_LWIP_GWADDR0, RT_LWIP_GWADDR1, RT_LWIP_GWADDR2, RT_LWIP_GWADDR3);			//?è??????   192.168.1.1
	IP4_ADDR(&netmask, RT_LWIP_MSKADDR0, RT_LWIP_MSKADDR1, RT_LWIP_MSKADDR2, RT_LWIP_MSKADDR3);	//?è??????	 255.255.255.0

netifapi_netif_set_addr(netif_default, &ipaddr, &netmask, &gw);
}```