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#include<reg51.h>
bit DHT_Start();
bit DHT_ByteRead(unsigned char *dat);
void ConfigTimer0(unsigned int ms);
void Display_hum(unsigned char *num);
void Display_temp(unsigned char *num);
unsigned char T0RH = 0; //T0重載值的高字節(jié)
unsigned char T0RL = 0; //T0重載值的低字節(jié)
unsigned char str=88;
unsigned char DHT[5];
unsigned int tmr1s = 0;
unsigned int tmr10ms = 0;
unsigned char st=0;
unsigned int sdd=0;
unsigned char td=0;
unsigned char mode=0;
bit flag1s = 0;
bit flag10ms = 0;
int x;
sbit button1=P0^0;
sbit dot=P1^3; //數(shù)碼管小數(shù)點(diǎn)
void delay(unsigned char x) //延時(shí)ms
{
unsigned char a,b,c;
for(c=x;c>0;c--)
{
for(b=102;b>0;b--)
for(a=3;a>0;a--);
}
}
void main()
{
bit tmp;
dot=0;
EA = 1; //開總中斷
ConfigTimer0(10); //T0定時(shí)10ms
// M1=0; M1=0;M2=0;M3=0;D1=0;D2=0;
DHT_Start();
delay(5);
while (1)
{
if(flag10ms) //數(shù)碼管刷新頻率
{
if(st==0){
Display_temp(&str);
flag10ms=0;
}
else if(st==1)
{
Display_hum(&str);
flag10ms=0;
}
}
else if (flag1s) //每秒更新一次溫度、濕度
{
DHT_Start();
tmp=DHT_ByteRead(&DHT);
if(tmp==1)
{
if(st==0)
{
str = DHT[2] ; //溫度
Display_temp(&str);
flag1s =0; //標(biāo)志位清零
}
else if(st==1){
str = DHT[0] ; //濕度
Display_hum(&str);
flag1s =0; //標(biāo)志位清零
}
}
}
if(button1==0)
{
delay(2);
if(button1==0)
{
mode++;
switch(mode)
{
case 0: st=0; break;
case 1: st=1; break;
case 2: td=1; break;
default: break;
}
if(mode>=3)
{
td=0;
mode=0;
}
while(button1==0)
{
}
}
}
}
}
/* 配置并啟動(dòng)T0，ms-T0定時(shí)時(shí)間 */
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp; //臨時(shí)變量
tmp = 11059200 / 12; //定時(shí)器計(jì)數(shù)頻率
tmp = (tmp * ms) / 1000; //計(jì)算所需的計(jì)數(shù)值
tmp = 65536 - tmp; //計(jì)算定時(shí)器重載值
tmp = tmp + 12; //補(bǔ)償中斷響應(yīng)延時(shí)造成的誤差
T0RH = (unsigned char)(tmp>>8); //定時(shí)器重載值拆分為高低字節(jié)
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0為模式1
TH0 = T0RH; //加載T0重載值
TL0 = T0RL;
ET0 = 1; //使能T0中斷
TR0 = 1; //啟動(dòng)T0
}
/* T0中斷服務(wù)函數(shù)，完成1秒定時(shí) */
void InterruptTimer0() interrupt 1
{
TH0 = T0RH; //重新加載重載值
TL0 = T0RL;
tmr1s++;
sdd++;
tmr10ms++;
if(tmr10ms>=1) // 數(shù)碼管刷新頻率
{
tmr10ms=0;
flag10ms = 1;
}
if(td==1)
{
if(sdd>=500) //溫度顯示5s 、濕度顯示5s
{
sdd=0;
if(st==0)
{
st=1;
}
else st=0;
}
}
if (tmr1s >= 200) //1s 數(shù)據(jù)更新頻率
{
tmr1s = 0;
flag1s = 1;
}
}

復(fù)制代碼