linux 串口例程

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

int main(int argc, char *argv[]) {
    int fd;
    struct termios options;
    char buffer[256];

    if (argc != 2) {
        fprintf(stderr, "Usage: %s <serial_port>\n", argv[0]);
        exit(1);
    }

    fd = open(argv[1], O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open");
        exit(1);
    }

    tcgetattr(fd, &options);
    cfsetispeed(&options, B9600);
    cfsetospeed(&options, B9600);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_oflag &= ~OPOST;
    tcsetattr(fd, TCSANOW, &options);

    while (1) {
        int n = read(fd, buffer, sizeof(buffer));
        if (n > 0) {
            write(STDOUT_FILENO, buffer, n);
        }
    }

    close(fd);
    return 0;
}