C#上位机和单片机TCP通信数据传输怎么写代码

在C#上位机和单片机之间进行TCP通信数据传输，需要编写两端的代码。下面是一个简单的示例代码，演示了如何在C#上位机和STM32单片机之间进行TCP通信数据传输。

C#上位机代码：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class TcpClientExample
{
    public static void Main()
    {
        try
        {
            // 创建一个新的TcpClient对象
            TcpClient tcpClient = new TcpClient();

            // 连接到STM32单片机的IP地址和端口号
            tcpClient.Connect(IPAddress.Parse("192.168.1.100"), 1234);

            // 获取网络流对象
            NetworkStream networkStream = tcpClient.GetStream();

            // 发送数据到STM32单片机
            byte[] sendBytes = Encoding.UTF8.GetBytes("Hello STM32!");
            networkStream.Write(sendBytes, 0, sendBytes.Length);

            // 接收STM32单片机的回复
            byte[] receiveBytes = new byte[1024];
            int receiveCount = networkStream.Read(receiveBytes, 0, receiveBytes.Length);
            string receiveString = Encoding.UTF8.GetString(receiveBytes, 0, receiveCount);
            Console.WriteLine("Received from STM32: {0}", receiveString);

            // 关闭网络流和TcpClient对象
            networkStream.Close();
            tcpClient.Close();
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception: {0}", ex);
        }
    }
}

STM32单片机代码（使用ST的HAL库）：

#include "stm32f4xx_hal.h"
#include <string.h>

#define TCP_SERVER_PORT 1234

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART6_UART_Init(void);
static void MX_ETH_Init(void);

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_USART6_UART_Init();
  MX_ETH_Init();

  // 创建一个TCP服务器
  int serverSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (serverSocket < 0) {
    Error_Handler();
  }

  // 绑定服务器IP地址和端口号
  struct sockaddr_in serverAddr;
  memset(&serverAddr, 0, sizeof(serverAddr));
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  serverAddr.sin_port = htons(TCP_SERVER_PORT);
  if (bind(serverSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
    Error_Handler();
  }

  // 监听客户端连接请求
  if (listen(serverSocket, 1) < 0) {
    Error_Handler();
  }

  while (1) {
    // 接受客户端连接请求
    struct sockaddr_in clientAddr;
    socklen_t clientAddrLen = sizeof(clientAddr);
    int clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddr, &clientAddrLen);
    if (clientSocket < 0) {
      Error_Handler();
    }

    // 接收客户端发送的数据
    char buf[1024];
    int rcvCnt = recv(clientSocket, buf, sizeof(buf), 0);
    if (rcvCnt > 0) {
      printf("Received from C#: %s\n", buf);

      // 发送回复给客户端
      char *sendStr = "Hello C#!";
      int sendCnt = send(clientSocket, sendStr, strlen(sendStr), 0);
      if (sendCnt < 0) {
        Error_Handler();
      }
    }

    // 关闭客户端连接
    close(clientSocket);
  }
}

注意：以上代码仅供参考，实际使用时需要根据自己的需求进行修改。在实际应用中，还需要考虑网络传输的稳定性和安全性等问题。