linux 串口程序加载

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

int open_serial_port(const char *port) {
    int fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open_serial_port: Unable to open port");
        return -1;
    }
    return fd;
}

int configure_serial_port(int fd, int baud_rate) {
    struct termios options;
    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;
    tcsetattr(fd, TCSANOW, &options);
    return 0;
}

ssize_t read_serial_port(int fd, void *buffer, size_t length) {
    return read(fd, buffer, length);
}

ssize_t write_serial_port(int fd, const void *buffer, size_t length) {
    return write(fd, buffer, length);
}

void close_serial_port(int fd) {
    close(fd);
}

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

int main() {
    int fd = open_serial_port("/dev/ttyUSB0");
    if (fd == -1) {
        return 1;
    }

    configure_serial_port(fd, B9600);

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

    const char *data = "Hello, Serial Port!";
    write_serial_port(fd, data, strlen(data));

    close_serial_port(fd);
    return 0;
}