linux环境 串口编程工程

sudo chmod 666 /dev/ttyS0

struct termios options;
tcgetattr(fd, &options);
cfsetispeed(&options, B9600); // 设置输入波特率为9600
cfsetospeed(&options, B9600); // 设置输出波特率为9600
options.c_cflag |= (CLOCAL | CREAD);
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
options.c_cflag &= ~CSIZE;
options.c_cflag |= CS8;
tcsetattr(fd, TCSANOW, &options);

char buffer[256];
int n = read(fd, buffer, sizeof(buffer));
if (n > 0) {
    buffer[n] = '\0';
    printf("Received data: %s\n", buffer);
}

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

int main() {
    int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open_port: Unable to open /dev/ttyS0");
        return -1;
    }

    struct termios options;
    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;
    tcsetattr(fd, TCSANOW, &options);

    char write_buffer[] = "Hello, Serial Port!";
    write(fd, write_buffer, sizeof(write_buffer));

    char read_buffer[256];
    int n = read(fd, read_buffer, sizeof(read_buffer));
    if (n > 0) {
        read_buffer[n] = '\0';
        printf("Received data: %s\n", read_buffer);
    }

    close(fd);
    return 0;
}