linux 串口读写代码

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.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_port: Unable to open serial port");
        return -1;
    }

    // 设置串口参数
    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);

    // 写入数据
    char *data = "Hello, Serial Port!";
    write(fd, data, strlen(data));

    // 读取数据
    int n = read(fd, buffer, sizeof(buffer));
    if (n > 0) {
        buffer[n] = '\0';
        printf("Received: %s\n", buffer);
    } else {
        perror("read");
    }

    close(fd);
    return 0;
}