用C语言编写Linux环境下读写串口的代码

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

int main()
{
    int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY);
    if (fd < 0) {
        printf("Open serial port failed!\n");
        return -1;
    }

    struct termios options;
    tcgetattr(fd, &options);

    options.c_cflag |= CLOCAL;
    options.c_cflag |= CREAD;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CRTSCTS;

    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_iflag &= ~(IXON | IXOFF | IXANY);
    options.c_oflag &= ~OPOST;

    options.c_cc[VTIME] = 0;
    options.c_cc[VMIN] = 1;

    cfsetispeed(&options, B9600);
    cfsetospeed(&options, B9600);

    tcsetattr(fd, TCSANOW, &options);

    char buf[1024];

    // 读取串口数据
    int n = read(fd, buf, sizeof(buf));
    if (n > 0) {
        printf("Read data: %s\n", buf);
    }

    // 写入串口数据
    char data[] = "Hello, serial port!";
    write(fd, data, sizeof(data));

    close(fd);

    return 0;
}