linux内核串口驱动使用

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

int main() {
    int serial_port = open("/dev/ttyS0", 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 *message = "Hello, Serial Port!\n";
    write(serial_port, message, strlen(message));

    close(serial_port);
    return 0;
}