linux串口接收和发送

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

#define SERIAL_PORT "/dev/ttyS0"
#define BAUD_RATE B9600

int main() {
    int fd;
    struct termios options;

    // 打开串口设备
    fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open");
        exit(EXIT_FAILURE);
    }

    // 设置串口参数
    tcgetattr(fd, &options);
    cfsetispeed(&options, BAUD_RATE);
    cfsetospeed(&options, BAUD_RATE);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_oflag &= ~OPOST;
    tcsetattr(fd, TCSANOW, &options);

    // 发送数据
    const char *send_data = "Hello, Serial Port!";
    write(fd, send_data, strlen(send_data));

    // 接收数据
    char receive_data[256];
    int n = read(fd, receive_data, sizeof(receive_data) - 1);
    if (n > 0) {
        receive_data[n] = '\0';
        printf("Received data: %s\n", receive_data);
    } else {
        perror("read");
    }

    // 关闭串口设备
    close(fd);

    return 0;
}