帮我写一个基于89C52单片机用DS18B20控制步进电机随温度升高电机转速由慢到快并用LCD1602显示实时温度的程序源码

您可以参考下面的源码示例，这是一个基于89C52单片机、DS18B20温度传感器、步进电机和LCD1602显示屏的程序，实现了温度升高时电机转速由慢到快，并在LCD1602上显示实时温度。

#include <reg52.h>
#include <stdio.h>
#include <intrins.h>

#define LCD1602_DB P0
sbit LCD1602_RS = P2^0;
sbit LCD1602_RW = P2^1;
sbit LCD1602_E = P2^2;

sbit STEP = P1^0; // 步进电机控制引脚

unsigned char code lcd_init_cmd[] = {0x38, 0x0c, 0x06, 0x01, 0x80};
unsigned char lcd_buf[16]; // 用于存储LCD显示的字符串

void delay(unsigned int n)
{
    unsigned int i, j;
    for (i = n; i > 0; i--)
        for (j = 110; j > 0; j--);
}

void lcd_write_cmd(unsigned char cmd)
{
    LCD1602_RS = 0;
    LCD1602_RW = 0;
    LCD1602_DB = cmd;
    LCD1602_E = 1;
    _nop_();
    _nop_();
    _nop_();
    LCD1602_E = 0;
    delay(5);
}

void lcd_write_data(unsigned char dat)
{
    LCD1602_RS = 1;
    LCD1602_RW = 0;
    LCD1602_DB = dat;
    LCD1602_E = 1;
    _nop_();
    _nop_();
    _nop_();
    LCD1602_E = 0;
    delay(5);
}

void lcd_init()
{
    unsigned char i;
    lcd_write_cmd(0x01); // 清屏命令
    delay(5);
    for (i = 0; i < 5; i++)
    {
        lcd_write_cmd(lcd_init_cmd[i]);
        delay(5);
    }
}

void lcd_gotoxy(unsigned char x, unsigned char y)
{
    unsigned char addr;
    if (y == 0)
        addr = 0x80 + x;
    else
        addr = 0xc0 + x;
    lcd_write_cmd(addr);
    delay(5);
}

void lcd_display_string(unsigned char x, unsigned char y, unsigned char *str)
{
    lcd_gotoxy(x, y);
    while (*str != '\0')
    {
        lcd_write_data(*str++);
        delay(5);
    }
}

void ds18b20_init()
{
    DSPORT = 1;
    delay(8);
    DSPORT = 0;
    delay(80);
    DSPORT = 1;
    delay(30);
}

bit ds18b20_check()
{
    bit flag;
    DSPORT = 1;
    delay(1);
    DSPORT = 0;
    delay(80);
    DSPORT = 1;
    delay(30);
    flag = DSPORT;
    delay(30);
    return flag;
}

unsigned char ds18b20_read_byte()
{
    unsigned char i, j, dat;
    dat = 0;
    for (i = 0; i < 8; i++)
    {
        DSPORT = 0;
        dat >>= 1;
        DSPORT = 1;
        j = DSPORT;
        delay(5);
        if (j)
            dat |= 0x80;
        delay(40);
    }
    return dat;
}

void ds18b20_read_temp()
{
    unsigned char temp;
    ds18b20_init();
    ds18b20_check();
    delay(30);
    ds18b20_init();
    ds18b20_write_byte(0xcc);
    ds18b20_write_byte(0x44);
    delay(30);
    ds18b20_init();
    ds18b20_write_byte(0xcc);
    ds18b20_write_byte(0xbe);
    temp = ds18b20_read_byte();
    lcd_display_string(0, 1, "Temp: ");
    sprintf(lcd_buf, "%d", temp);
    lcd_display_string(6, 1, lcd_buf);
}

void main()
{
    unsigned int i;
    unsigned char speed;
    lcd_init();
    lcd_display_string(0, 0, "Temp Control Motor");
    while (1)
    {
        ds18b20_read_temp();
        speed = 100 - temp; // 根据温度计算转速，此处为简化示例
        for (i = 0; i < speed; i++) // 控制电机转速
        {
            STEP = 1;
            delay(10);
            STEP = 0;
            delay(10);
        }
        delay(500); // 延时一段时间后再次读取温度
    }
}

请注意，这只是一个简单的示例，具体的硬件连接和代码实现可能需要根据您的电路设计和开发环境进行适当的调整。建议您参考相关的硬件和软件资料，以确保正确实现您的项目需求。