linux 串口 ioctl

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/serial.h>

int main() {
    int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY);
    if (fd == -1) {
        perror("Failed to open serial port");
        return 1;
    }

    struct serial_struct ser_info;
    if (ioctl(fd, TIOCGSERIAL, &ser_info) == -1) {
        perror("Failed to get serial info");
        close(fd);
        return 1;
    }

    ser_info.flags &= ~ASYNC_SPD_MASK;
    ser_info.flags |= ASYNC_SPD_9600; // 设置波特率为9600
    ser_info.cflag &= ~CSIZE;
    ser_info.cflag |= CS8; // 设置数据位为8
    ser_info.cflag &= ~PARENB; // 禁用校验
    ser_info.cflag &= ~CSTOPB; // 设置停止位为1

    if (ioctl(fd, TIOCSSERIAL, &ser_info) == -1) {
        perror("Failed to set serial info");
        close(fd);
        return 1;
    }

    close(fd);
    return 0;
}