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想問(wèn)一下怎么修改程序把溫度下限可以設(shè)置為負(fù)數(shù)
uchar code tab1[]={"Now Tem: . C "};
uchar code tab2[]={"TH: C TL: C"};
uint c;
uchar Mode=0; //狀態(tài)標(biāo)志
signed char TH=40; //上限報(bào)警溫度，默認(rèn)值為40
signed char TL=-15; //下限報(bào)警溫度，默認(rèn)值為-15
//============================================================================================
//====================================DS18B20=================================================
//============================================================================================
/*****延時(shí)子程序*****/
void Delay_DS18B20(int num)
{
while(num--) ;
}
void delay(uint xms)//延時(shí)函數(shù)，有參函數(shù)
{
uint x,y;
for(x=xms;x>0;x--)
for(y=110;y>0;y--);
}
/*****初始化DS18B20*****/
void Init_DS18B20(void)
{
unsigned char x=0;
DQ = 1; //DQ復(fù)位
Delay_DS18B20(8); //稍做延時(shí)
DQ = 0; //單片機(jī)將DQ拉低
Delay_DS18B20(80); //精確延時(shí)，大于480us
DQ = 1; //拉高總線(xiàn)
Delay_DS18B20(14);
x = DQ; //稍做延時(shí)后，如果x=0則初始化成功，x=1則初始化失敗
Delay_DS18B20(20);
}
/*****讀一個(gè)字節(jié)*****/
unsigned char ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
{
DQ = 0; // 給脈沖信號(hào)
dat>>=1;
DQ = 1; // 給脈沖信號(hào)
if(DQ)
dat|=0x80;
Delay_DS18B20(4);
}
return(dat);
}
/*****寫(xiě)一個(gè)字節(jié)*****/
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
Delay_DS18B20(5);
DQ = 1;
dat>>=1;
}
}
/*****讀取溫度*****/
unsigned int ReadTemperature(void)
{
unsigned char a=0;
unsigned char b=0;
unsigned int t=0;
float tt=0;
Init_DS18B20();
WriteOneChar(0xCC); //跳過(guò)讀序號(hào)列號(hào)的操作
WriteOneChar(0x44); //啟動(dòng)溫度轉(zhuǎn)換
Init_DS18B20();
WriteOneChar(0xCC); //跳過(guò)讀序號(hào)列號(hào)的操作
WriteOneChar(0xBE); //讀取溫度寄存器
a=ReadOneChar(); //讀低8位
b=ReadOneChar(); //讀高8位
t=b;
t<<=8;
t=t|a;
tt=t*0.0625;
// t= tt*10+0.5; //放大10倍輸出并四舍五入
t= tt*10+0.5;
return(t);
}
/*****讀取溫度*****/
void check_wendu(void)
{
c=ReadTemperature()-5; //獲取溫度值并減去DS18B20的溫漂誤差
if(c>1200)
c=1200;
}
/********液晶寫(xiě)入指令函數(shù)與寫(xiě)入數(shù)據(jù)函數(shù)，以后可調(diào)用**************/
void write_1602com(uchar com)//****液晶寫(xiě)入指令函數(shù)****
{
RS=0;//數(shù)據(jù)/指令選擇置為指令
// rw=0; //讀寫(xiě)選擇置為寫(xiě)
LCD1602=com;//送入數(shù)據(jù)
delay(1);
EN=1;//拉高使能端，為制造有效的下降沿做準(zhǔn)備
delay(1);
EN=0;//en由高變低，產(chǎn)生下降沿，液晶執(zhí)行命令
}
void write_1602dat(uchar dat)//***液晶寫(xiě)入數(shù)據(jù)函數(shù)****
{
RS=1;//數(shù)據(jù)/指令選擇置為數(shù)據(jù)
// rw=0; //讀寫(xiě)選擇置為寫(xiě)
LCD1602=dat;//送入數(shù)據(jù)
delay(1);
EN=1; //en置高電平，為制造下降沿做準(zhǔn)備
delay(1);
EN=0; //en由高變低，產(chǎn)生下降沿，液晶執(zhí)行命令
}
void lcd_init()//***液晶初始化函數(shù)****
{
uchar a;
write_1602com(0x38);//設(shè)置液晶工作模式，意思：16*2行顯示，5*7點(diǎn)陣，8位數(shù)據(jù)
write_1602com(0x0c);//開(kāi)顯示不顯示光標(biāo)
write_1602com(0x06);//整屏不移動(dòng)，光標(biāo)自動(dòng)右移
write_1602com(0x01);//清顯示
write_1602com(0x80);//日歷顯示固定符號(hào)從第一行第1個(gè)位置之后開(kāi)始顯示
for(a=0;a<16;a++)
{
write_1602dat(tab1[a]);//向液晶屏寫(xiě)日歷顯示的固定符號(hào)部分
delay(3);
}
write_1602com(0x80+0x40);//時(shí)間顯示固定符號(hào)寫(xiě)入位置，從第2個(gè)位置后開(kāi)始顯示
for(a=0;a<16;a++)
{
write_1602dat(tab2[a]);//寫(xiě)顯示時(shí)間固定符號(hào)，兩個(gè)冒號(hào)
delay(3);
}
}
void display()
{
if(Mode==0)
{
write_1602com(0x80+8);
write_1602dat(c/1000+0x30);
write_1602dat((c%1000)/100+0x30);
write_1602dat(((c%1000)%100)/10+0x30);
write_1602com(0x80+12);
write_1602dat(((c%1000)%100)%10+0x30);
write_1602com(0x80+13);
write_1602dat(0xdf);
write_1602com(0x80+0x40+3);
write_1602dat(TH/10+0x30);
write_1602dat(TH%10+0x30);
write_1602dat(0xdf);
write_1602com(0x80+0x40+12);
write_1602dat(TL/10+0x30);
write_1602dat(TL%10+0x30);
write_1602dat(0xdf);
}
}
//=====================================================================================
/*****初始化定時(shí)器0*****/
void InitTimer(void)
{
TMOD=0x1;
TH0=0x3c;
TL0=0xb0; //50ms（晶振12M）
EA=1; //全局中斷開(kāi)關(guān)
TR0=1;
ET0=1; //開(kāi)啟定時(shí)器0
}
void KEY()
{
//功能鍵
if(SET==0)
{
BUZZ=0;
delay(10);
if(SET==0)
{
Mode++;
if(Mode==3)
Mode=0;
BUZZ=1;
}
while(SET==0)
{
if(Mode==0)
{
// write_1602com(0x80+0x40+6);
write_1602com(0x0c);
}
else if(Mode==1)
{
write_1602com(0x80+0x40+4);
write_1602com(0x0f);
}
else
{
write_1602com(0x80+0x40+13);
write_1602com(0x0f);
}
}
}
//增加
if(ADD==0&&Mode==1)
{
BUZZ=0;
delay(10);
if(ADD==0)
{
TH++;
if(TH>=99)
TH=99;
write_1602com(0x80+0x40+3);
write_1602dat(TH/10+0x30);
write_1602dat(TH%10+0x30);
write_1602com(0x80+0x40+4);
BUZZ=1;
}
while(ADD==0);
}
//減少
if(DEC==0&&Mode==1)
{
BUZZ=0;
delay(10);
if(DEC==0)
{
TH--;
if(TH==TL)
TH=TL+1;
write_1602com(0x80+0x40+3);
write_1602dat(TH/10+0x30);
write_1602dat(TH%10+0x30);
write_1602com(0x80+0x40+4);
BUZZ=1;
}
while(DEC==0);
}
if(ADD==0&&Mode==2)
{
BUZZ=0;
delay(10);
if(ADD==0)
{
TL++;
if(TL==TH)
TL=TH-1;
write_1602com(0x80+0x40+12);
write_1602dat(TL/10+0x30);
write_1602dat(TL%10+0x30);
write_1602com(0x80+0x40+13);
BUZZ=1;
}
while(ADD==0);
}
//減少
if(DEC==0&&Mode==2)
{
BUZZ=0;
delay(10);
if(DEC==0)
{
TL--;
if(TL<=0)
TL=0;
write_1602com(0x80+0x40+12);
write_1602dat(TL/10+0x30);
write_1602dat(TL%10+0x30);
write_1602com(0x80+0x40+13);
BUZZ=1;
}
while(DEC==0);
}
}
/*****報(bào)警子程序*****/
void Alarm()
{
if(x>=10){beep_st=~beep_st;x=0;}
if(Mode==0)
{
if((c/10)>=TH)
{
ALAM=0;
ALAM1=1;
if(beep_st==1)
BUZZ=0;
else
BUZZ=1;
}
else if((c/10)<TL)
{
ALAM1=0;
ALAM=1;
if(beep_st==1)
BUZZ=0;
else
BUZZ=1;
}
else
{
BUZZ=1;
ALAM=1;
ALAM1=1;
}
}
else
{
BUZZ=1;
ALAM=1;
ALAM1=1;
}
}
/*****主函數(shù)*****/
void main(void)
{
uint z;
delay(1);
lcd_init();
delay(1);
InitTimer(); //初始化定時(shí)器
for(z=0;z<100;z++)
{
check_wendu();
delay(1);
}
while(1)
{
display();
KEY();
Alarm();
check_wendu();
}
}
/*****定時(shí)器0中斷服務(wù)程序*****/
void timer0(void) interrupt 1
{
TH0=0x3c;
TL0=0xb0;
x++;
}
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