MCU芯片：STM32F407ZGT6

软件：keil5+cubemx6.11(需要6.11及以上版本)+freertos

PHY芯片:LAN8742

协议：tcp/ip

连接方式：soket

功能：单片机板子做服务器实现以太网数据回显+热拔插

一，硬件电路：

二，软件：

CUBMX配置：

1.先配置好freertos系统，栈大小选择为1024字，优先级为osPriorityNormal

2.配置ETH:

3.配置lwip协议：选择phy芯片

设置为静态ip地址，关闭UDP(我是直连电脑的所以网关地址就随便设置了)

4.keil5程序：在freertos.c中void StartDefaultTask(void *argument)中添加：

void StartDefaultTask(void *argument) {   /* init code for LWIP */   MX_LWIP_Init();   /* USER CODE BEGIN StartDefaultTask */   /* Infinite loop */   for(;;)   {     int sock = -1, connected; 		struct sockaddr_in server_addr, client_addr; 		socklen_t sin_size;  		printf("/--------------------ETHInit Begin--------------------/\r\n"); 		printf("LOCAL_PORT:%d\r\n", LOCAL_PORT); 		printf("IP_ADDRESS:%d.%d.%d.%d\r\n", IP_ADDRESS[0], IP_ADDRESS[1], IP_ADDRESS[2], IP_ADDRESS[3]); 		printf("NETMASK_ADDRESS:%d.%d.%d.%d\r\n", NETMASK_ADDRESS[0], NETMASK_ADDRESS[1], NETMASK_ADDRESS[2], NETMASK_ADDRESS[3]); 		printf("GATEWAY_ADDRESS:%d.%d.%d.%d\r\n", GATEWAY_ADDRESS[0], GATEWAY_ADDRESS[1], GATEWAY_ADDRESS[2], GATEWAY_ADDRESS[3]); 		printf("ETH Linkl Success\r\n"); 		printf("/--------------------ETHInit END--------------------/\r\n"); 		if ((char *)pvPortMalloc(1536) == NULL) 		{ 			printf("No memory\n"); 			goto __exit; 		}  		sock = socket(AF_INET, SOCK_STREAM, 0); 		if (sock < 0) 		{ 			printf("Socket error\n"); 			goto __exit; 		}  		server_addr.sin_family = AF_INET; 		server_addr.sin_addr.s_addr = INADDR_ANY; 		server_addr.sin_port = htons(LOCAL_PORT); 		memset(&(server_addr.sin_zero), 0, sizeof(server_addr.sin_zero)); 		if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) 		{ 			printf("Unable to bind\n"); 			goto __exit; 		}  		if (listen(sock, 5) == -1) 		{ 			printf("Listen error\n"); 			goto __exit; 		} 		while (1) 		{ 			sin_size = sizeof(struct sockaddr_in); 			connected = accept(sock, (struct sockaddr *)&client_addr, &sin_size); 			printf("new client connected from (%s, %d)\n", 				   inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port)); 			{ 				int flag = 1; 				setsockopt(connected, 						   IPPROTO_TCP,	  /* set option at TCP level */ 						   TCP_NODELAY,	  /* name of option */ 						   (void *)&flag, /* the cast is historical cruft */ 						   sizeof(int));  /* length of option value */ 			} 			while (1) 			{ 				if (recv(connected, eth_resbuff, 1024, 0) <= 0)break; 				if (write(connected, eth_resbuff, strlen((char *)eth_resbuff)) < 0)break; 			} 			if (connected >= 0) 				closesocket(connected);  			connected = -1; 		} 	__exit: 		if (sock >= 0) 			closesocket(sock); 		free(eth_resbuff);   }   /* USER CODE END StartDefaultTask */ }

电脑以太网设置为静态ip要和单片机在同一个网段，我设置为（192.168.2.8）

ping一下（如图所示为成功）：

查看串口是否正常打印和连接以太网（如图所示为成功）：

添加热拔插功能：在cubemx中打开链路检测回调函数

在keil程序中找到lwip.c中的void MX_LWIP_Init(void)

将创建的任务优先级改为osPriorityNormal，再在static void ethernet_link_status_updated(struct netif *netif)添加相应的拔开与插入提示

查看串口是否有拔插提示且拔插后是否仍可以保持以太网连接（如图所示为成功）