接温湿度模块 DHT11 问题

catbal · 发表于 2012-11-28 17:19:39

显示的都是0 我找不到问题的所在
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "key.h"
#include "usart.h"
#include "exti.h"
#include "wdg.h"
#include "timer.h"
#include "pwm.h"
#include "lcd.h"
#include "rtc.h"
//#include "dht11.h"

const u8 *COMPILED_DATE=__DATE__;//获得编译日期
const u8 *COMPILED_TIME=__TIME__;//获得编译时间

const u8* Week[7]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

#define dht11 PBin(9)
unsigned char ly_dis[4];//定义显示缓冲区
u8 U8FLAG,k;
u8 U8count,U8temp;
u8 U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;
u8 U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;
u8 U8comdata;

void dht11_init(void) //配置IO口
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
GPIO_Init(GPIOB, &GPIO_InitStructure);

}
void COM(void)
{
u8 i;
    for(i=0;i<8;i++)
{
    U8FLAG=2;
    while((!dht11)&&U8FLAG++);
  delay_us(30);
   U8temp=0;
     if(dht11)
   U8temp=1;
  U8FLAG=2;
  while((dht11)&&U8FLAG++);
    //超时则跳出for循环
    if(U8FLAG==1)break;
    //判断数据位是0还是1
  // 如果高电平高过预定0高电平值则数据位为 1
   U8comdata<<=1;
    U8comdata|=U8temp;        //0
}
}
void RH(void)
{
dht11=0;
delay_ms(18);
dht11=1;

delay_us(40);
dht11=1;

if(!dht11)
{
    U8FLAG=2;
    while((!dht11)&&U8FLAG++);
    U8FLAG=2;
    while((dht11)&&U8FLAG++);
   //数据接收状态
     COM();
    U8RH_data_H_temp=U8comdata;
    COM();
    U8RH_data_L_temp=U8comdata;
    COM();
    U8T_data_H_temp=U8comdata;
    COM();
    U8T_data_L_temp=U8comdata;
    COM();
    U8checkdata_temp=U8comdata;
    dht11=1;
    U8temp=(U8T_data_H_temp+U8T_data_L_temp+U8RH_data_H_temp+U8RH_data_L_temp);
    if(U8temp==U8checkdata_temp)
    {
       U8RH_data_H=U8RH_data_H_temp;
       U8RH_data_L=U8RH_data_L_temp;
    U8T_data_H=U8T_data_H_temp;
       U8T_data_L=U8T_data_L_temp;
       U8checkdata=U8checkdata_temp;
    }

}
}
int main(void)
{
SystemInit();
delay_init(72);      //延时初始化
NVIC_Configuration();
  uart_init(9600);
  LED_Init();
LCD_Init();
RTC_Init();
dht11_init();
OINT_COLOR=RED;//设置字体为红色
LED0=1;

while(1)
{
RH(); //调用温湿度读取子程序

  ly_dis[0]=U8RH_data_H/10; //数据转换，因DHT11小断部份是保留，所以这里只显示出整数部份
  ly_dis[1]=U8RH_data_H%10;
  ly_dis[2]=U8T_data_H/10;
  ly_dis[3]=U8T_data_H%10;
  LCD_ShowNum(108,162,ly_dis[0],1,16);
  LCD_ShowNum(122,162,ly_dis[1],1,16);
  LCD_ShowNum(136,162,ly_dis[2],1,16);
  LCD_ShowNum(150,162,ly_dis[3],1,16);
  delay_ms(1000);
  delay_ms(1000);
  LED0=!LED0;

}
}