写一段关于风速变送器的c485语言代码和其makefile文件

以下是一个简单的C485语言代码示例，用于读取风速变送器的数据并将其显示在终端上：

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

#define BAUDRATE B9600
#define DEVICE "/dev/ttyUSB0"

int main()
{
    int fd;
    struct termios options;
    unsigned char buf[256];

    fd = open(DEVICE, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1)
    {
        fprintf(stderr, "Failed to open %s\n", DEVICE);
        return EXIT_FAILURE;
    }

    fcntl(fd, F_SETFL, 0);

    tcgetattr(fd, &options);
    cfsetispeed(&options, BAUDRATE);
    cfsetospeed(&options, BAUDRATE);
    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CRTSCTS;
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_oflag &= ~OPOST;
    options.c_cc[VMIN] = 0;
    options.c_cc[VTIME] = 10;

    tcsetattr(fd, TCSANOW, &options);

    while (1)
    {
        int n = read(fd, buf, sizeof(buf));
        if (n > 0)
        {
            buf[n] = '\0';
            printf("%s", buf);
        }
    }

    close(fd);

    return EXIT_SUCCESS;
}

以下是该代码的Makefile文件：

CC = gcc
CFLAGS = -Wall -Wextra -Werror

all: main

main: main.c
    $(CC) $(CFLAGS) -o $@ $<

clean:
    rm -f main

请注意，此代码仅供参考，您需要根据您的设备和需求进行修改。