linux 串口中断接收

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char **argv)
{
    int fd;
    struct termios oldtio, newtio;
    char buf[256];

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

    fd = open(argv[1], O_RDWR | O_NOCTTY);
    if (fd < 0) {
        perror("open");
        exit(1);
    }

    tcgetattr(fd, &oldtio); /* save old port settings */
    newtio = oldtio; /* copy old settings */

    cfsetispeed(&newtio, B9600); /* set baud rate */
    cfsetospeed(&newtio, B9600);

    newtio.c_cflag |= (CLOCAL | CREAD); /* enable receiver and set local mode */
    newtio.c_cflag &= ~PARENB; /* no parity */
    newtio.c_cflag &= ~CSTOPB; /* 1 stop bit */
    newtio.c_cflag &= ~CSIZE;
    newtio.c_cflag |= CS8; /* 8 data bits */

    newtio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /* raw input mode */
    newtio.c_iflag &= ~(IXON | IXOFF | IXANY); /* no software flow control */
    newtio.c_oflag &= ~OPOST; /* raw output mode */

    tcsetattr(fd, TCSANOW, &newtio); /* set new port settings */

    // Enable serial port interrupts
    fcntl(fd, F_SETFL, FNDELAY); // Non-blocking mode

    while (1) {
        int n = read(fd, buf, sizeof(buf));
        if (n > 0) {
            printf("Received data: %s\n", buf);
            memset(buf, 0, sizeof(buf)); // Clear the buffer
        }
    }

    close(fd);
    return 0;
}