linux 内核 stm32

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

int main() {
    int serial_port = open("/dev/ttyUSB0", O_RDWR);
    if (serial_port < 0) {
        printf("Error %i from open: %s\n", errno, strerror(errno));
        return 1;
    }

    struct termios tty;
    if (tcgetattr(serial_port, &tty) != 0) {
        printf("Error %i from tcgetattr: %s\n", errno, strerror(errno));
        return 1;
    }

    cfsetospeed(&tty, B9600);
    cfsetispeed(&tty, B9600);

    tty.c_cflag &= ~PARENB; // Clear parity bit
    tty.c_cflag &= ~CSTOPB; // Clear stop field
    tty.c_cflag &= ~CSIZE;
    tty.c_cflag |= CS8; // 8 bits per byte
    tty.c_cflag &= ~CRTSCTS; // Disable RTS/CTS hardware flow control
    tty.c_cflag |= CREAD | CLOCAL; // Turn on READ & ignore ctrl lines

    if (tcsetattr(serial_port, TCSANOW, &tty) != 0) {
        printf("Error %i from tcsetattr: %s\n", errno, strerror(errno));
        return 1;
    }

    char read_buf [256];
    while (1) {
        int n = read(serial_port, &read_buf, sizeof(read_buf));
        if (n < 0) {
            printf("Error reading: %s", strerror(errno));
            break;
        }
        printf("%.*s", n, read_buf);
    }

    close(serial_port);
    return 0;
}