C++在嵌入式系统开发中的各个协议通信功能实现技巧

#include <iostream>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>

int main()
{
    int fd;
    char buffer[255];

    // 打开串口
    fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1)
    {
        perror("打开串口失败");
        return -1;
    }

    // 配置串口参数
    struct termios options;
    tcgetattr(fd, &options);
    cfsetispeed(&options, B9600);   // 设置输入波特率为9600
    cfsetospeed(&options, B9600);   // 设置输出波特率为9600
    options.c_cflag |= (CLOCAL | CREAD);
    tcsetattr(fd, TCSANOW, &options);

    // 读取串口数据
    while (1)
    {
        memset(buffer, 0, sizeof(buffer));
        read(fd, buffer, sizeof(buffer));
        std::cout << "收到数据：" << buffer << std::endl;
    }

    // 关闭串口
    close(fd);

    return 0;
}

#include <iostream>
#include <boost/asio.hpp>

int main()
{
    boost::asio::io_context io_context;
    boost::asio::ip::tcp::socket socket(io_context);

    // 连接服务器
    boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::address::from_string("127.0.0.1"), 1234);
    socket.connect(endpoint);

    // 发送数据
    std::string message = "Hello, server!";
    boost::system::error_code error;
    boost::asio::write(socket, boost::asio::buffer(message), error);
    if (error)
    {
        std::cerr << "发送数据失败：" << error.message() << std::endl;
        return -1;
    }

    // 接收数据
    char buffer[255];
    boost::asio::read(socket, boost::asio::buffer(buffer), error);
    if (error)
    {
        std::cerr << "接收数据失败：" << error.message() << std::endl;
        return -1;
    }

    std::cout << "收到数据：" << buffer << std::endl;

    // 断开连接
    socket.close();

    return 0;
}

#include <iostream>
#include <wiringPiI2C.h>

int main()
{
    int fd = wiringPiI2CSetup(0x04);
    if (fd == -1)
    {
        std::cerr << "打开 I2C 设备失败" << std::endl;
        return -1;
    }

    // 发送数据
    wiringPiI2CWrite(fd, 'h');
    
    // 接收数据
    char data = wiringPiI2CRead(fd);
    std::cout << "收到数据：" << data << std::endl;

    return 0;
}