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两段程序用的DHT11驱动是同一个文件，
下面这段程序可以正常运行，可以正常显示数据，数据也是正常的：
#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char //无符号字符型类型数据
#define uint unsigned int //无符号整型数据
extern void InitLCD1602();
extern void LcdShowStr(uchar x, uchar y, uchar *str);
extern void DHT11GetData(uchar *dat);
extern void Delay20ms();
void Delay1000ms();
void RefreashDHT11DataShow();
sbit lcd1602bg = P2^2;
uchar dht11data[5] = {48,49,50,51,'\0'};
void main()
{
lcd1602bg = 0;
Delay1000ms();
InitLCD1602();
while(1)
{
Delay1000ms();
DHT11GetData(dht11data);
LcdShowStr(0,0,dht11data);
RefreashDHT11DataShow();
}
}
void RefreashDHT11DataShow()
{
static uchar RH[3],Temp[3];
RH[0] = dht11data[0];
RH[1] = dht11data[1];
RH[2] = '\0';
Temp[0] = dht11data[2];
Temp[1] = dht11data[3];
Temp[2] = '\0';
LcdShowStr(13,0,RH);
LcdShowStr(12,1,Temp);
}
void Delay1000ms() //@11.0592MHz
{
unsigned char i, j, k;
_nop_();
i = 8;
j = 1;
k = 243;
do
{
do
{
while (--k);
} while (--j);
} while (--i);
}
下面这段程序就会出现数据时而正确，时而错误（省去了关于时间和按键的代码，时间和按键的代码也是完全正常的运行，之前测试过了）：
#include <reg52.h>
typedef unsigned char uchar;
typedef unsigned int uint;
bit timeflag200ms = 1;
bit dht11flag1s = 0;
struct stime buftime; //日期时间缓冲区
uchar dht11data[4]; //湿度十位，湿度个位，温度十位，温度个位
uchar T0RH = 0; //T0重载值的高字节
uchar T0RL = 0; //T0重载值的低字节
uint setindex = 0; //时间设置索引
sbit lcd1602gb = P2^2;
extern void KeyScan(); //扫描按键
extern void KeyDriver(); //按键驱动
extern void InitDS1302(); //初始化DS1302
extern void GetRealTime(struct stime *time); //获得时间
extern void SetRealTime(struct stime *time); //设置时间
extern void InitLcd1602(); //初始化LCD1602
extern void LcdShowStr(uchar x, uchar y, uchar *str); //显示字符串 在液晶上显示字符串，(x,y)-对应屏幕上的起始坐标，str-字符串指针
extern void LcdSetCursor(uchar x, uchar y); //设置坐标
extern void LcdOpenCursor(); //打开闪烁光标
extern void LcdCloseCursor(); //关闭光标
extern void LcdWriteDat(uchar dat); //写字符
extern void LcdSetCursor(uchar x, uchar y); //设置光标位置
extern void DHT11GetData(uchar *dat); //获取DHT11数据
void ConfigTimer0(uint ms); //配置计时器T0
void RefreshTimeShow(); //刷新时间显示
void RefreashDHT11DataShow(); //刷新DHT11数据显示
void main()
{
uchar psec = 0xAA; //秒备份，初值AA确保首次读取时间后会刷新显示
uchar du = 0xdf; //°ascii码
EA = 1; //开总中断
ConfigTimer0(1); //T0定时1ms
InitDS1302(); //初始化实时时钟
InitLcd1602(); //初始化液晶
//初始化屏幕上固定不变的内容
LcdShowStr(0, 0, "20 - - %");
LcdShowStr(0, 1, " : : C");
LcdSetCursor(14,1);
LcdWriteDat(du); //显示°符号
lcd1602gb = 0; //默认打开背光
while(1)
{
KeyDriver();
if(timeflag200ms && (setindex == 0))
{
timeflag200ms = 0;
GetRealTime(&buftime); //获取当前时间
if (psec != buftime.sec) //检测到时间有变化时刷新显示
{
RefreshTimeShow();
psec = buftime.sec; //用当前值更新上次秒数
}
}
if(dht11flag1s && (setindex == 0))
{
dht11flag1s = 0;
DHT11GetData(dht11data);
RefreashDHT11DataShow();
}
}
}
void ConfigTimer0(uint ms)
{
unsigned long tmp; //临时变量
tmp = 11059200 / 12; //定时器计数频率
tmp = (tmp * ms) / 1000; //计算所需的计数值
tmp = 65536 - tmp; //计算定时器重载值
tmp = tmp + 28; //补偿中断响应延时造成的误差
T0RH = (uchar)(tmp>>8); //定时器重载值拆分为高低字节
T0RL = (uchar)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0为模式1
TH0 = T0RH; //加载T0重载值
TL0 = T0RL;
ET0 = 1; //使能T0中断
TR0 = 1; //启动T0
}
void RefreashDHT11DataShow()
{
static uchar RH[3],Temp[3];
RH[0] = dht11data[0];
RH[1] = dht11data[1];
RH[2] = '\0';
Temp[0] = dht11data[2];
Temp[1] = dht11data[3];
Temp[2] = '\0';
LcdShowStr(13,0,RH);
LcdShowStr(12,1,Temp);
}
void InterruptTimer0() interrupt 1
{
static uint tmr200ms = 0;
static uint tmr1s = 0;
TH0 = T0RH; //重新加载重载值
TL0 = T0RL;
KeyScan();
tmr200ms++;
tmr1s++;
if (tmr200ms >= 200) //定时200ms
{
tmr200ms = 0;
timeflag200ms = 1;
}
if(tmr1s >= 1000)
{
tmr1s = 0;
dht11flag1s = 1;
}
}
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