串口上不常见的波特率 - Linux

Question

我正在尝试制作一个程序来读取串口。在这个端口上，我收到波特率为875000的数据。这种情况并不常见，我没有成功修改它。我做了一个小C程序来做到这一点，但它不适用于875000 ...这里的代码的一部分与串口的编程：

    #include <stdio.h>
    #include <stdlib.h>
    #include <asm/termios.h>
    #include <sys/fcntl.h>
    #include <unistd.h>
    #include <errno.h>
    #include <string.h>
    #include "test.h"

    void read_Serial_Port(const char* DEVICE_PORT)
    {
        int file;
        struct ktermios options;
        unsigned int nCountMax = 60;
        bool b;

        file = open(DEVICE_PORT, O_RDONLY | O_NOCTTY | O_NDELAY);

        if(file == -1){perror("Unable to open the serial port
");}
        //printf("Serial port open successful !
");
        int speed = atoi("875000");

        ioctl(file, TCGETS2, &options);     


        options.c_ispeed = speed;
        options.c_ospeed = speed;

        options.c_cflag |= (CLOCAL | CREAD);              
        options.c_cflag |= PARENB;                  
        options.c_cflag |= PARODD; 
        options.c_cflag &= ~CBAUD;

        options.c_cflag |= BOTHER;                                          
        options.c_cflag &= ~CSIZE;                      
        options.c_cflag |= CS8;     

        ioctl(file, TCSETS2, &options); 


        //printf("Reading serial port ...

"); 
        b = readMessage(file, nCountMax);

        if (b == 0){printf("Error while reading serial port
");}
        //else printf("
Serial port read successful
");

        close(file);
        //printf("Serial port closed
");
    };