STM32F407以太网服务器配置及热拔插详解

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）

作者：大能人499