基于矩阵按键可调上下限温度报警1602显示空白 -

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit BEEP=P2^1;//蜂鸣器接口定义
sbit DQ=P1^6; //ds18b20数据线接口定义
sbit RS=P3^0;
sbit RW=P3^1;
sbit E=P3^2;
/*函数定义*/
void delay(uint k);
void init_watch(void);
void lcd_init(void);
void showchar(void);
void lcd_write_command(uchar dat);
void lcd_write_data(uchar dat);
void display(uchar *p);
void watch_show(void);
uint read_temp(void);
void ds18b20_reset(void);
uchar ds18b20_readdata(void);
void ds18b20_writedata(uchar dat);
void ds18b20_temp_display(void);
void key_scan(void);
uchar code table[]={0x10,0x06,0x09,
0x08,0x08,0x09,0x06,0x00};//字符℃
uchar tab[]={0x30,0x31,0x32,0x33,0x34,
0x35,0x36,0x37,0x38,0x39};//0~9ASCII码
/*字符串及变量定义*/
uchar code str1[]={"TEMP:"};
uchar code str2[]={"TH:"};
uchar code str3[]={"TL:"};
uchar code str4[]={"member1:"};
uchar code str5[]={"chen feng!"};
uchar code str6[]={"member2:"};
uchar code str7[]={"zhang shun!"};
uchar code str8[]={"member3:"};
uchar code str9[]={"yang zheng ru!"};
uchar code str10[]={" Welcome"};
uchar code str11[]={"To wen kong!"};
uchar hour1,hour2,min1,min2,sec1,
sec2,t,hour,min,sec,tflag;
uchar year1,year2,year3,year4,month,
month1,month2,day,day1,day2;
uchar moshi=0;//初始显示界面定义
uint year,tvalue,temph=30,templ=15;
unsigned data disdata[5];
void delay(uint k)
{ while(k--);}
/*lcd初始化*/
void lcd_init(void)
{ lcd_write_command(0x30);
lcd_write_command(0x30);
lcd_write_command(0x30);
lcd_write_command(0x38);
lcd_write_command(0x08);
lcd_write_command(0x01);
lcd_write_command(0x06);
lcd_write_command(0x0c);
}
/*始终初始化及中断定义*/
void init_watch()
{ hour=10;year=2012;month=7;day=5;
lcd_init();
TMOD=0x01; //工作方式1
TH0=(65536-5000)/256;
TL0=(65536-5000)%256;
EA=1; //开总中断
ET0=1; //开定时器中断0
EX0=1; //开外部中断0
IT0=1;//外部中断0下降沿触发
TR0=1;//启动定时器0
}
/*显示温度界面提示字符*/
void showchar(void)
{ lcd_init();
lcd_write_command(0x80);
display(str1);//显示字符串str1
}
/*lcd写命令子程序*/
void lcd_write_command(uchar dat)
{
delay(5);//操作前短暂延时，保证信号稳定
P0=dat;
RS=0;
RW=0;
E=1;
E=0;
delay(100);
}
/*lcd写数据子程序*/
void lcd_write_data(uchar dat)
{
delay(5);//操作前短暂延时，保证信号稳定
P0=dat;
RS=1;
RW=0;
E=1;
E=0;
delay(100);
}
/*lcd显示时间*/
void watch_show()
{ year1=year/1000;year2=year/100%10;
year3=year%100/10;year4=year%10;
month1=month/10;month2=month%10;
day1=day/10;day2=day%10;hour1=hour/10;
hour2=hour%10;min1=min/10;
min2=min%10; sec1=sec/10;sec2=sec%10;
lcd_write_command(0x84);
lcd_write_data(tab[hour1]);//显示时高位
lcd_write_data(tab[hour2]);//显示时低位
lcd_write_data(0x3a);
lcd_write_data(tab[min1]);//显示分高位
lcd_write_data(tab[min2]);//显示分低位
lcd_write_data(0x3a);
lcd_write_data(tab[sec1]);//显示秒高位
lcd_write_data(tab[sec2]);//显示秒低位
lcd_write_command(0xc3);//下四行显示年
lcd_write_data(tab[year1]);
lcd_write_data(tab[year2]);
lcd_write_data(tab[year3]);
lcd_write_data(tab[year4]);
lcd_write_data('-');//显示-
lcd_write_data(tab[month1]);//显示月高位
lcd_write_data(tab[month2]);//显示月低位
lcd_write_data('-');
lcd_write_data(tab[day1]);//显示日高位
lcd_write_data(tab[day2]);//显示日低位
}
/*显示字符子程序*/
void display(uchar *p)
{ while(*p!='\0')
{ lcd_write_data(*p);p++; }
}
/*ds18b20复位*/
void ds18b20_reset(void)
{ DQ=0;
delay(100);
DQ=1;
delay(50);
}
/*读ds8b20数据*/
uchar ds18b20_readdata(void)
{ uchar i,value;
value=0;
for(i=8;i>0;i--)
{ DQ=0;
value>>=1;
DQ=1;
if(DQ)
{ value|=0x80;}
delay(5);
}
return(value);
}
/*ds18b20写数据*/
void ds18b20_writedata(uchar dat)
{ uchar i;
for(i=8;i>0;i--)
{ DQ=0;
DQ=dat&0x01;
delay(5);
DQ=1;
dat>>=1;
}
}
/*读取温度并转换*/
uint read_temp(void)
{ uchar a,b;
ds18b20_reset();
ds18b20_writedata(0xcc);
ds18b20_writedata(0x44);
delay(100);
ds18b20_reset();
ds18b20_writedata(0xcc);
ds18b20_writedata(0xbe);
delay(100);
a=ds18b20_readdata();
b=ds18b20_readdata();
tvalue=b;
tvalue<<=8;
tvalue=tvalue|a;
if(tvalue<=0x0fff)
tflag=0;//温度符号位为正
else
{ tvalue=~tvalue+1;tflag=1; }//符号位为负
tvalue=tvalue*0.625;
return(tvalue);
}
/*温度显示*/
void ds18b20_temp_display(void)
{ char flagdat,m=0;
disdata[0]=tvalue/1000+0x30;
disdata[1]=(tvalue%1000)/100+0x30;
disdata[2]=(tvalue%100)/10+0x30;
disdata[3]=tvalue%10+0x30;
if(tflag==0) flagdat=' ';//温度为正不显示
else flagdat=0x2d;//温度为负则显示-
if(disdata[0]==0x30)
{ disdata[0]=0x20;//温度最高位为0不显示
if(disdata[1]==0x30)
{ disdata[1]=0x20; }
}
lcd_write_command(0x89);
lcd_write_data(flagdat);//显示符号位
lcd_write_data(disdata[0]);//显示温度
lcd_write_data(disdata[1]);
lcd_write_data(disdata[2]);
lcd_write_data(0x2e);//显示小数点
lcd_write_data(disdata[3]);//显示温度小数位
lcd_write_command(0x40); for(m=0;m<8;m++) //CGRAM中写入字符℃
{ lcd_write_data(table[m]); }
lcd_write_command(0x8f);
lcd_write_data(0x00);//显示字符℃
lcd_write_command(0xc0);
display(str2);
lcd_write_data((temph/10)+0x30);
lcd_write_data((temph%10)+0x30);
lcd_write_command(0xc5);
lcd_write_data(0x00);
lcd_write_command(0xc9);
display(str3);
lcd_write_data((templ/10)+0x30);
lcd_write_data((templ%10)+0x30);
lcd_write_command(0xce);
lcd_write_data(0x00);
}
/*定时器0中断产生时间*/
void timer0() interrupt 1
{TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
t++;
if(t==20)
{ t=0;
sec++;
if(sec==60)
{ sec=0;
min++;
if(min==60)
{ min=0;
hour++;
if(hour==24)
{ hour=0;
day++;
if((month==1||month==3||month==5||
month==7||month==8||month==10||
month==12)&day==32)
{ day=1;
month++;
}
if((month==4||month==6||month==9||
month==11)&&day==31)
{ day=1;
month++;
}
if(year%4!=0&&month==2&&day==29)
{ day=1;
month++;
}
if(year%4==0&&month==2&&day==30)
{ day=1;
month++;
}
if(month==13)
{ month=1;
year++;
}
}
}
}
}
}
/*外部中断0实现显示界面的转换*/
void iint0() interrupt 0
{ moshi++;//一次中断则显示界面转换一次
if(moshi==6) moshi=0;//共6个显示界面
}
/*4*4键盘扫描*/
uchar Keycan(void)
{ uchar rcode, ccode;
P1=0xF0;
if((P1&0xF0) != 0xF0)
{ delay(30000);
if((P1&0xF0) != 0xF0)
{rcode=0xFE;
while((rcode&0x10) != 0)
{P1=rcode;
if((P1&0xF0) != 0xF0)
{ ccode = (P1&0xF0)|0x0F;
do{;}while((P1&0xF0)!=0xF0);
return ((~rcode) + (~ccode));
}
else
rcode = (rcode<<1)|0x01;
}
}
}
return 0;
}
/*根据扫描结果调整报警上下限、日期及时间*/
void KeyDispaly(uchar key)
{ switch(key)
{case 0x11: temph++; break;//提高报警上限
case 0x21: temph--; break;//降低报警上限
case 0x41: templ++; break;//提高报警下限
case 0x81: templ--; break;//降低报警下限
case 0x12: sec++; break;//按键增加秒
case 0x22: sec--; break;//按键降低秒
case 0x42: min++; break;//按键增加分
case 0x82: min--; break;//按键降低分
case 0x14: hour++; break;//按键增加时
case 0x24: hour--; break;//按键降低时
case 0x44: day++; break;//按键增加日
case 0x84: day--; break;//按键降低日
case 0x18: month++; break;//按键增加月
case 0x28: month--; break;//按键降低月
case 0x48: year++; break;//按键增加年
case 0x88: year--; break;//按键降低年
default: break;
}
}
/*主程序*/
void main(void)
{ uchar Key;
DQ=1;
BEEP=1;//初始蜂鸣器不报警
init_watch();
while(1)
{ if(moshi==0)//显示界面1
{ lcd_write_command(0x01);
while(moshi==0)
{ lcd_write_command(0x80);
display(str10);
lcd_write_command(0xc1);
display(str11);
}
}
if(moshi==1)//显示界面2
{ lcd_write_command(0x01);//lcd清屏
while(moshi==1)
{ lcd_write_command(0x80);
display(str4);
lcd_write_command(0xc2);
display(str5);
}
}
if(moshi==2)//显示界面3
{ lcd_write_command(0x01);
while(moshi==2)
{ lcd_write_command(0x80);
display(str6);
lcd_write_command(0xc3);
display(str7);
}
}
if(moshi==3)//显示界面4
{ lcd_write_command(0x01);
while(moshi==3)
{ lcd_write_command(0x80);
display(str8);
lcd_write_command(0xc1);
display(str9);
}
}
if(moshi==4)//显示界面5
{ lcd_write_command(0x01);
showchar();
while(moshi==4)
{ read_temp();//读温度
if(((tvalue/10)%100)>=temph)
BEEP=0;//温度大于上限时报警
else if(((tvalue/10)%100)<=templ)
BEEP=0;//温度小于下限时报警
else BEEP=1;//否则不报警
ds18b20_temp_display();
Key = Keycan();//键盘扫描
KeyDispaly(Key);//调整报警上下限
}
}
if(moshi==5)//显示界面6
{ lcd_write_command(0x01);
while(moshi==5)
{ watch_show();//显示日期时间
Key = Keycan();
KeyDispaly(Key);
}
}
}
}

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