linux下串口read

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

int main() {
    int fd;
    struct termios options;
    char buffer[256];

    // 打开串口设备文件
    fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY);
    if (fd == -1) {
        perror("open_port: Unable to open port");
        return -1;
    }

    // 获取当前串口设置
    tcgetattr(fd, &options);

    // 设置波特率
    cfsetispeed(&options, B9600);
    cfsetospeed(&options, B9600);

    // 设置数据位、停止位和校验位
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;

    // 应用设置
    tcsetattr(fd, TCSANOW, &options);

    // 读取数据
    int n = read(fd, buffer, sizeof(buffer));
    if (n < 0) {
        perror("read: Unable to read data");
    } else {
        printf("Read %d bytes: %s
", n, buffer);
    }

    // 关闭串口设备文件
    close(fd);

    return 0;
}