DS18B20的51驱动程序，带浮点数返回值

以下是DS18B20的51驱动程序，带浮点数返回值：

#include <reg52.h>

typedef unsigned char uchar;
typedef unsigned int uint;

sbit DQ = P2^3;

uchar code Table[16] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71};

uchar temp;

void Delay1ms(uint);
void Delay10us(uint);
void Write_Ds18b20(uchar, uchar);
uchar Read_Ds18b20();
void Display(uchar, uchar, uchar, uchar);
float Get_Temperature();

void main()
{
    while (1)
    {
        Display(0, 0, 0, 0);
        temp = Get_Temperature();
        Display(temp / 100, temp / 10 % 10, temp % 10, 0x3f);
    }
}

void Delay1ms(uint i)
{
    uchar j, k;
    for (; i > 0; i--)
    {
        _nop_();
        _nop_();
        j = 11;
        k = 190;
        do
        {
            while (--k);
        } while (--j);
    }
}

void Delay10us(uint i)
{
    while (i--)
    {
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
        _nop_();
    }
}

void Write_Ds18b20(uchar dat, uchar id)
{
    uchar i;
    for (i = 0; i < 8; i++)
    {
        DQ = 0;
        Delay10us(1);
        DQ = dat & 0x01;
        dat >>= 1;
        Delay10us(4);
        DQ = 1;
        Delay10us(1);
    }
}

uchar Read_Ds18b20()
{
    uchar i, dat = 0;
    for (i = 0; i < 8; i++)
    {
        DQ = 0;
        Delay10us(1);
        DQ = 1;
        Delay10us(1);
        dat |= DQ << i;
        Delay10us(4);
    }
    return dat;
}

void Display(uchar a, uchar b, uchar c, uchar d)
{
    uchar i;
    uchar code DisCode[4] = {0xfe, 0xfd, 0xfb, 0xf7};
    uchar DisData[4] = {a, b, c, d};
    for (i = 0; i < 4; i++)
    {
        P0 = DisCode[i];
        P1 = Table[DisData[i]];
        Delay1ms(2);
        P1 = 0x00;
    }
}

float Get_Temperature()
{
    uchar temp_low, temp_high;
    float temperature;
    Write_Ds18b20(0xcc, 0);
    Write_Ds18b20(0x44, 0);
    Delay1ms(100);
    Write_Ds18b20(0xcc, 0);
    Write_Ds18b20(0xbe, 0);
    temp_low = Read_Ds18b20();
    temp_high = Read_Ds18b20();
    temperature = (float)((temp_high << 8) | temp_low) / 16.0;
    return temperature;
}

其中，`Get_Temperature()` 函数返回浮点数类型的温度值。在主函数中，通过调用 `Get_Temperature()` 函数获取温度值，并将其显示在数码管上。