用AT89C51和DS18B20采集温度，在UG-2864HSWEG01上显示代码

以下是基于AT89C51和DS18B20采集温度，并在UG-2864HSWEG01上显示的示例代码：

#include <reg51.h>
#include <intrins.h>
#include <stdio.h>

#define DS18B20_DQ P3_7
#define UG_EN P2_3
#define UG_RW P2_2
#define UG_RS P2_1
#define UG_E P2_0

#define DS18B20_SKIP_ROM 0xCC
#define DS18B20_CONVERT_T 0x44
#define DS18B20_READ_SCRATCHPAD 0xBE

sbit SDA = P1^3;
sbit SCL = P1^2;

unsigned char code g_LcdInitCmd[] = {0x38, 0x0c, 0x06, 0x01, 0x02, 0x80};
unsigned char code g_LcdClearCmd[] = {0x01};

void delay_us(unsigned int us)
{
    while (us--)
    {
        _nop_();
    }
}

void delay_ms(unsigned int ms)
{
    while (ms--)
    {
        delay_us(1000);
    }
}

void DS18B20_Write_Byte(unsigned char dat)
{
    unsigned char i;
    for (i = 0; i < 8; i++)
    {
        DS18B20_DQ = 0;
        _nop_();
        _nop_();
        DS18B20_DQ = dat & 0x01;
        _nop_();
        _nop_();
        DS18B20_DQ = 1;
        dat >>= 1;
    }
}

unsigned char DS18B20_Read_Byte()
{
    unsigned char i, dat = 0;
    for (i = 0; i < 8; i++)
    {
        DS18B20_DQ = 0;
        _nop_();
        _nop_();
        dat >>= 1;
        if (DS18B20_DQ)
        {
            dat |= 0x80;
        }
        _nop_();
        _nop_();
        DS18B20_DQ = 1;
    }
    return dat;
}

void UG_Write_Cmd(unsigned char cmd)
{
    UG_EN = 0;
    UG_RW = 0;
    UG_RS = 0;
    P0 = cmd;
    UG_EN = 1;
    delay_us(1);
    UG_EN = 0;
    delay_ms(2);
}

void UG_Write_Data(unsigned char dat)
{
    UG_EN = 0;
    UG_RW = 0;
    UG_RS = 1;
    P0 = dat;
    UG_EN = 1;
    delay_us(1);
    UG_EN = 0;
    delay_ms(2);
}

void UG_Init()
{
    unsigned char i;
    UG_Write_Cmd(0x38);
    UG_Write_Cmd(0x0c);
    UG_Write_Cmd(0x06);
    UG_Write_Cmd(0x01);
    UG_Write_Cmd(0x02);
    UG_Write_Cmd(0x80);
}

void UG_Clear()
{
    UG_Write_Cmd(0x01);
}

void UG_Puts(unsigned char x, unsigned char y, unsigned char *str)
{
    unsigned char i = 0;
    if (y == 1)
    {
        UG_Write_Cmd(0x80 + x);
    }
    else
    {
        UG_Write_Cmd(0xc0 + x);
    }
    while (str[i] != '\0')
    {
        UG_Write_Data(str[i]);
        i++;
    }
}

void UG_Putc(unsigned char x, unsigned char y, unsigned char c)
{
    if (y == 1)
    {
        UG_Write_Cmd(0x80 + x);
    }
    else
    {
        UG_Write_Cmd(0xc0 + x);
    }
    UG_Write_Data(c);
}

void UG_Display_Temperature(float temperature)
{
    char str[17];
    sprintf(str, "Temperature: %.1f C", temperature);
    UG_Clear();
    UG_Puts(0, 0, "AT89C51+DS18B20");
    UG_Puts(0, 1, str);
}

void DS18B20_Start_Convert()
{
    DS18B20_Write_Byte(DS18B20_SKIP_ROM);
    DS18B20_Write_Byte(DS18B20_CONVERT_T);
}

unsigned int DS18B20_Read_Temperature()
{
    unsigned char temp_l, temp_h;
    unsigned int temp;
    DS18B20_Write_Byte(DS18B20_SKIP_ROM);
    DS18B20_Write_Byte(DS18B20_READ_SCRATCHPAD);
    temp_l = DS18B20_Read_Byte();
    temp_h = DS18B20_Read_Byte();
    temp = temp_h;
    temp <<= 8;
    temp |= temp_l;
    return temp;
}

void main()
{
    float temperature;
    unsigned int temp;
    UG_Init();
    UG_Clear();
    UG_Puts(0, 0, "AT89C51+DS18B20");
    while (1)
    {
        DS18B20_Start_Convert();
        delay_ms(750);
        temp = DS18B20_Read_Temperature();
        temperature = (float)temp / 16.0;
        UG_Display_Temperature(temperature);
        delay_ms(2000);
    }
}

需要注意的是，这个示例代码是基于AT89C51的，如果你使用的是其他型号的单片机，需要对代码进行相应的修改。同时，UG-2864HSWEG01显示屏需要通过SPI通信方式进行控制，如有需要也需要对代码进行修改。