大家帮忙看看megal16+18B20+1602测温程序只显示一个小箭头怎么回事啊？？？

dp1987829

/*****************************************************
This program was produced by the
CodeWizardAVR V2.03.4 Standard
Automatic Program Generator
?Copyright 1998-2008 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com

Project :
Version :
Date    : 2010-8-13
Author  :
Company :
Comments:


Chip type           : ATmega16
Program type        : Application
Clock frequency     : 8.000000 MHz
Memory model        : Small
External RAM size   : 0
Data Stack size     : 256
*****************************************************/
#define MAX_DEVICES 8   
#include <mega16.h>
#include <delay.h>  
#include <stdio.h>  
#include <stdlib.h> // DS1820 Temperature Sensor functions
#include <ds18b20.h>
#include <lcd.h>  
#asm
.equ __lcd_port=0x15
#endasm

// 1 Wire Bus functions
#include <1wire.h>
#asm
   .equ __w1_port=0x1b
   .equ __w1_bit=0
#endasm

unsigned char ds18b20_devices;         
             //number of DS1820 devices connected to the 1 Wire bus  
unsigned char rom_code[MAX_DEVICES][9]; //DS18B20 devices ROM code storage area  

//定义18B20检测
void DS18B20_cfg(void)  
          //Search DS18B20 Device and Configure each DS18B20 device;  
{   
    unsigned char i;  
    // detect how many DS18B20 devices are connected to the 1 Wire bus   
    ds18b20_devices=w1_search(DS18B20_SEARCH_ROM_CMD,rom_code);   
   
    // configure each DS18B20 device for 12 bit temperature measurement resolution   
    for (i=0;i<ds18b20_devices;i++)  
      ds18b20_init(&rom_code[i++][0],10,30,DS18B20_12BIT_RES);  
}   
void main(void)
{
w1_init();  
lcd_init(16);
lcd_clear();  
lcd_gotoxy(0,0);
DS18B20_cfg(); //检测DS18B20是否存在

if(ds18b20_devices)  
{
lcd_putsf("Init Successful");   
}
else
{   
   lcd_putsf("ERROR !!!");  
   lcd_gotoxy(0,1);
   lcd_putsf("Out of connect!");
   while(1);
}

while(1)
      {
       lcd_gotoxy(1,1);
       lcd_putchar(ds18b20_temperature(&rom_code[0][0]));  //显示温度
       delay_ms(300);        
      };
}

swustlx86

估计是延时问题