请高手指点！

请高手帮我看看这程序，出错在那里，为怎么上电时一直显示“当前温度0e℃"
#include
#include
#define uchar unsigned char
#define uint unsigned int

***it LCD_RS = P2 ^ 0;
***it LCD_RW = P2 ^ 1;
***it LCD_EN = P2 ^ 2;
***it LCD_PSB = P2 ^ 3;
***it LCD_RST = P2 ^ 5;
***it DQ=P3^7;
sfr P1M0 =0X92;

uchar temp,I;
uchar code DIS[]={"当前温度27℃"};
uchar code shuzu[]={"0123456789"};

void delayds18b20(uchar i)
{
while(i--);
}
void delayms(uint ms)
{
uchar y;
while (ms--)
{
for (y = 0; y < 114; y++);
}
}

void delayNOP()
{
_nop_();
_nop_();
_nop_();
_nop_();

_nop_();
_nop_();
_nop_();
_nop_();

}

void lcd_wcmd(uchar cmd)
{
LCD_RS=0;
LCD_RW=0;
LCD_EN=0;
P0=cmd;
delayms(5);
LCD_EN=1;
delayms(5);
LCD_EN=0;
}

void lcd_wdat(uchar dat)
{

LCD_RS=1;
LCD_RW=0;
LCD_EN=0;
P0=dat;
delayms(5);
LCD_EN=1;
delayms(5);
LCD_EN=0;
}

void lcd_init()//12864液晶初始化
{
LCD_PSB=1;
delayms(5);
lcd_wcmd(0x30);
delayms(5);
lcd_wcmd(0x0C);
delayms(5);
lcd_wcmd(0x06);
delayms(5);
lcd_wcmd(0x01);
delayms(5);
}

void lcd_pos(uchar X, uchar Y)
{
uchar pos;

if (X==1)
{
X=0x80;
}
else if (X==2)
{
X=0x90;
}
else if (X==3)
{
X=0x88;
}
else if (X==4)
{
X=0x98;
}
pos=X+Y; //确定显示地址

lcd_wcmd(pos); //写显示地址

}

void xianshi()
{
uchar k,l;

k=shuzu[temp%10];
l=shuzu[temp/10];

lcd_pos(2,4);
lcd_wdat(l+0x30);
lcd_wdat(k+0x30);

}

void init_ds18b20(void)
{
uchar n;
DQ=1;
delayds18b20(8);
DQ=0;
delayds18b20(80);
DQ=1;
delayds18b20(8);
n=DQ;
delayds18b20(4);

}

void ds18b20write_byte(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
DQ=0;
DQ=dat&0x01;
delayds18b20(4);
DQ=1;
dat>>=1;
}
delayds18b20(4);
}

uchar ds18b20read_byte(void)
{
uchar i,value;
for(i=0;i<8;i++)
{
DQ=0;
value>>=1;
DQ=1;
if(DQ)
value|=0x80;
delayds18b20(4);

}
return value;
}

uchar readtemperature(void)
{
uchar a,b;
init_ds18b20();
ds18b20write_byte(0xcc); //跳过ROM
ds18b20write_byte(0x44); //启动温度测量
delayds18b20(300);

init_ds18b20();
ds18b20write_byte(0xcc);
ds18b20write_byte(0xbe);
a=ds18b20read_byte();
b=ds18b20read_byte();
b<<=4;
b+=(a&0xf0)>>4;
return b;

}

void main(void)
{

P1M0=0XB0;
temp=readtemperature();
delayms(1);

P0=0xff;
P0=0;
lcd_init();

lcd_pos(2,0);
I=0;
while(DIS[I]!='')
{lcd_wdat(DIS[I]);
I++;}
delayms(1);
while(1)
{
xianshi();
}
}

lstcspring · 2012-10-3 15:04:17

这种程序网上一大堆，主要看一下读写时序，是否正确，不行直接用示波器看

h1654155758.5699 · 2012-10-3 19:09:46

谢谢！

肖玉堂 · 2012-10-3 20:56:54

看看时序对不，这样看也很难能够看出来

h1654155758.5699 · 2012-10-5 23:05:34

18B20的读写时序我已经详细看过没有错.也把18B20程序函数放到数码上读写显示正常，就是放到12864上就出这问题，难道是12864函数出错。没有老师带，自学真的很难。坚持..再坚持

h1654155758.5699 · 2012-10-7 22:17:09

终于找出问题出错在那里了。谢谢，版主和玉堂兄

辛星 · 2012-10-7 22:34:17

问题出在哪里呢？希望能给我们新手解答

h1654155758.5699 · 2012-10-7 23:12:24

我的表达能力很弱，我把程序贴出来，大家自己对比看看OK！
#include
#include
#define uchar unsigned char
#define uint unsigned int

***it LCD_RS = P2 ^ 0;
***it LCD_RW = P2 ^ 1;
***it LCD_EN = P2 ^ 2;
***it LCD_PSB = P2 ^ 3;
***it LCD_RST = P2 ^ 5;
***it DQ=P3^7;
sfr P1M0 =0X92;

uchar I,temp;
uchar code DIS4[16]={"当前温度27℃"};
uchar code shuzu[]={"0123456789"};

void delayus(uchar i)
{
while(i--);
}
void delayms(uint ms)
{
uchar y;
while (ms--)
{
for (y = 0; y < 114; y++);
}
}

void delayNOP()
{
_nop_();
_nop_();
_nop_();
_nop_();

_nop_();
_nop_();
_nop_();
_nop_();

}

void lcd_wcmd(uchar cmd)
{
LCD_RS=0;
LCD_RW=0;
LCD_EN=0;
P0=cmd;
delayms(5);
LCD_EN=1;
delayms(5);
LCD_EN=0;
}

void lcd_wdat(uchar dat)
{

LCD_RS=1;
LCD_RW=0;
LCD_EN=0;
P0=dat;
delayms(5);
LCD_EN=1;
delayms(5);
LCD_EN=0;
}

void lcd_init()//12864液晶初始化
{
LCD_PSB=1;
delayms(5);
lcd_wcmd(0x30);
delayms(5);
lcd_wcmd(0x0C);
delayms(5);
lcd_wcmd(0x06);
delayms(5);
lcd_wcmd(0x01);
delayms(5);
}

void lcd_pos(uchar X, uchar Y)
{
uchar pos;

if (X==1)
{
X=0x80;
}
else if (X==2)
{
X=0x90;
}
else if (X==3)
{
X=0x88;
}
else if (X==4)
{
X=0x98;
}
pos=X+Y; //确定显示地址

lcd_wcmd(pos); //写显示地址

}

void xianshi()
{
uchar k,l;

k=temp%10;
l=temp/10;

lcd_pos(4,4);
lcd_wdat(l+0x30);
lcd_wdat(k+0x30);

}

void init_ds18b20()
{
uchar j;
DQ=0;
delayus(100);
DQ=1;
delayus(5);
j=DQ;
delayus(15);

}

void ds18b20write_byte(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
DQ=0;
DQ=dat&0x01;
delayus(8);
DQ=1;
dat>>=1;
}
delayus(8);
}

uchar ds18b20read_byte(void)
{
uchar j,value;
for(j=0;j<8;j++)
{
DQ=0;
value>>=1;
DQ=1;
if(DQ==1)
value|=0x80;
delayus(6);

}
return value;
}

uchar readtemperature()
{
uchar a,b;
init_ds18b20();
ds18b20write_byte(0xcc); //跳过ROM
ds18b20write_byte(0x44); //启动温度测量
delayus(30);

init_ds18b20();
ds18b20write_byte(0xcc);
ds18b20write_byte(0xbe);
a=ds18b20read_byte();
b=ds18b20read_byte();
b<<=4;
b+=(a&0xf0)>>4;
return b;

}
void wenduweiz()
{
{
lcd_pos(4,3);
lcd_wcmd(0x0f);
{
shuzu[temp];
}
}
xianshi();
}

void main(void)
{

P1M0=0XB0;
init_ds18b20();
delayms(10);

P0=0xff;
P0=0;
lcd_init();

lcd_pos(4,0);
I=0;
while(DIS4[I]!='')
{lcd_wdat(DIS4[I]);
I++;}
delayms(100);
while(1)
{
temp=readtemperature();
xianshi();
}
}

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