DSPORT = 0;他欠定义

抱歉，我在之前的代码示例中没有为DSPORT进行定义。在使用DS18B20温度传感器时，需要定义和设置一个IO口作为数据线。请根据您实际的硬件连接情况，将DSPORT定义为相应的IO口。

以下是修改后的代码示例，您可以根据您的硬件连接情况将DSPORT定义为合适的IO口：

#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

sbit DSPORT = P3^4; // DS18B20数据线引脚，根据实际连接设置

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
    }
}

请根据实际情况修改代码中的DSPORT定义，并确保正确连接DS18B20数据线。