找到lwip网线插拔回调函数，测试通过

MDK-ARM/LWIP.uvguix.29643

@@ -1822,7 +1822,7 @@
         <Name>Build</Name>
         <Buttons>
           <Len>968</Len>
-          <Data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ata>
+          <Data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ata>
         </Buttons>
         <OriginalItems>
           <Len>583</Len>

Src/lwip.c

@@ -119,7 +119,7 @@ void MX_LWIP_Init(void)
   if (!netif_is_up(&gnetif)){
     netif_set_up(&gnetif);
     if (dhcp_start(&gnetif) == ERR_ARG){
-      NVIC_SystemReset(); /* 软�� */
+      NVIC_SystemReset(); /* 软��? */
     }
   }
 
@@ -143,11 +143,15 @@ static void ethernet_link_status_updated(struct netif *netif)
   if (netif_is_up(netif))
   {
 /* USER CODE BEGIN 5 */
+    extern void netif_link_up_user_func();
+    netif_link_up_user_func();
 /* USER CODE END 5 */
   }
   else /* netif is down */
   {
 /* USER CODE BEGIN 6 */
+    extern void netif_link_down_user_func();
+    netif_link_down_user_func();
 /* USER CODE END 6 */
   }
 }

usersrc/usermain.c

@@ -98,6 +98,16 @@ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
   }
 }
 
+void netif_link_up_user_func(void)
+{
+  printf("netif link up\r\n");
+}
+
+void netif_link_down_user_func(void)
+{
+  printf("netif link down\r\n");
+}
+
 void user_main()
 {
   printf("==============ethernet_sound_acquisition_card=============\r\n");