最近使用DHt11测温度和湿度，结果显示在1602上面，1602的显示看过没有问题，但是
“8bit湿度整数数据 + 8bit湿度小数数据+8bit温度整数数据 +
8bit温度小数数据”所得结果的末8位不等于8bit校验位等于，求各位大神看看程序具体哪里出错了？
#include <msp430x14x.h>
#include "cry1602.c"

///////////////引脚定义///////////////////////
#define DHT11_OUTPUT P2DIR|=BIT0
//P2.0
#define DHT11_INPUT
P2DIR&=~BIT0 //P2.0
#define DHT11_H P2OUT|=BIT0 //P2.0

#define DHT11_L
P2OUT&=~BIT0 //P2.0
#define
DHT11_IN (P2IN&BIT0)

uchar shuzi[] = {"0123456789."};
uchar tem[2];


///////////////DHT11输出数据//////////////////
unsigned char DHT11T_Data_H;
//温度高8位
unsigned char
DHT11T_Data_L; //温度低8位
unsigned char DHT11RH_Data_H;
//湿度高8位
unsigned char
DHT11RH_Data_L; //适度低8位

/////////////函数声明///////////////////////
unsigned char start_DHT11(void);
unsigned char DHT11_ReadChar(void);
void dht11(void);
void Delayus(int n);
////////////////////////////////////////////
//函数名称：Delayus
//功能：延时（us）,定时器查询方法
//调用：无
//返回：无
///////////////////////////////////////////
void Delayus(int n)
{

CCR0 = n;
TACTL |=
TACLR;
TACTL |= MC_1;

while(!(TACTL & BIT0));
//等待

TACTL &= ~MC_1; //停止计数
TACTL &= ~BIT0;
//清除中断标志
}

///////////主函数///////////////////
void main(void)
{

unsigned int readflag = 0;

WDTCTL = WDTPW + WDTHOLD;

TACTL|= TASSEL_2 + ID_3;
//时钟选择SMCLK，1/8分频,计数器1M频率

unsigned char humidity=0;

unsigned char temperature = 0;

LcdReset(); //显示提示信息

Disp1Char(8,0,'C'); //显示温度单位
while(1)
{
readflag = start_DHT11();
if(1)
{
temperature =
DHT11T_Data_H;//温度值，没有考虑小数

humidity = DHT11RH_Data_H; //湿度值，没有考虑小数

tem[0]=temperature/10; //验证是否执行到此

tem[1]=temperature%10;

Disp1Char(2,0,shuzi[tem[0]]);

Disp1Char(3,0,shuzi[tem[1]]);

}

Disp1Char(1,1,shuzi[readflag]); //读出readflag的值
}
}
////////////////////////////////////////////
//函数名称：start_DHT11
//功能：DHT11初始化及读取湿度值和温度值
//调用：DHT11_ReadChar（）
//返回：无
///////////////////////////////////////////
unsigned char start_DHT11(void)
{

unsigned char TData_H_temp = 0; //温度高8位中间变量
unsigned char TData_L_temp = 0;
//温度低8位中间变量
unsigned char
RHData_H_temp =0; //湿度高8位中间变量

unsigned char RHData_L_temp = 0; //湿度低8位中间变量
unsigned char CheckData_temp = 0;
//校验位8位中间变量
char checktemp =
0; //校验值

unsigned
char flag = 0;
unsigned int
count = 0;

DHT11_OUTPUT;
//设置P2.0输出 #define DHT11_OUTPUT P2DIR|=BIT0
DHT11_H; //输出高 #define DHT11_H
P2OUT|=BIT0
Delayus(10);
//延时10us
DHT11_L;
//输出低 #define DHT11_L P2OUT&=~BIT0
//拉低18ms以上
Delayus(30000);
DHT11_H; //输出高
DHT11_INPUT; //设置P2.0输入 #define
DHT11_INPUT P2DIR&=~BIT0

Delayus(60); //延时60us
if(!(DHT11_IN))
//检测P2.O输入电平,若为低电平

{
count=2;
//计数值设置为2

while((!DHT11_IN)&&count++);
count=2;
while((DHT11_IN)&&count++);

RHData_H_temp =
DHT11_ReadChar();

RHData_L_temp = DHT11_ReadChar();
TData_H_temp = DHT11_ReadChar();

TData_L_temp =
DHT11_ReadChar();

CheckData_temp = DHT11_ReadChar();
DHT11_OUTPUT;
//设置P2.0输出
DHT11_H;
//P2.0输出高，释放总线
checktemp = (RHData_H_temp + RHData_L_temp
+ TData_H_temp + TData_L_temp); //判断校验位是否正确
if (checktemp == CheckData_temp)

{
DHT11RH_Data_H = RHData_H_temp;

DHT11RH_Data_L =
RHData_L_temp;

DHT11T_Data_H = TData_H_temp;

DHT11T_Data_L = TData_L_temp;
flag=1;
}
}
return flag;
//返回flag，若返回1说明读取正确
}
////////////////////////////////////////////
//函数名称：DHT11_ReadChar
//功能：DHT11读取1字节数据
//调用：
//返回：无
///////////////////////////////////////////
unsigned char DHT11_ReadChar(void)
{

unsigned char dat=0;
unsigned
int count; //计数防止死等

unsigned char i;

for(i=0;i<8;i++)
{

count=2;
while((!DHT11_IN)&&count++);
//等待50us低电平结束,程序进入死循环退出 #define DHT11_IN (P2IN&BIT0)
Delayus(35);
dat <<= 1;

if(DHT11_IN)
//50us低电平+28us高电平表示'0',50us低电平+70us高电平表示'1'
{
dat |= 1;
}
count=2;
while((DHT11_IN)&&count++);
//程序进入死循环退出

/*while(DHT11_IN);

if(count==1) //超时则跳出for循环
{
break;
}*/
}
return dat;
} 此帖出自小平头技术问答