STM8S操作DHT11温湿度传感器c语言程序模组

STM8S @ 16M 定时器定时5ms中断一次

#define _G_DHT11

#include "dht11.h"

unsigned char uc_DHT11Value[SIZE];

//全局变量得到的温湿度值

unsigned int ui_TempValue = 0;

unsigned int ui_HumiValue = 0;

extern unsigned char uc_20mstimeflag;

/************************************************************* 函数名称:

函数功能:

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*************************************************************/ unsigned char s_ComDHT11(void)

{

unsigned char i,temp,comdata;

for(i = 8;i>0;i--)

{

while(!DHT11_DATA_VALUE);

DHT11_Delay_10us();

DHT11_Delay_10us();

DHT11_Delay_10us();

DHT11_Delay_10us();

temp = 0;

if(DHT11_DATA_VALUE)

{

temp =1;

}

comdata = comdata << 1;

comdata = comdata|temp;

while(DHT11_DATA_VALUE);

}

return comdata;

}

函数名称:

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入口参数的类型和含义:

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*************************************************************/

void g_ReadTempAndHumi(void)

{

DHT11_DATA_OUT;

DHT11_DATA_LOW;

//layTime(40);// 至少18MS的延时,在中断计时里实现

uc_20mstimeflag = 1;

while(uc_20mstimeflag);

DHT11_DATA_HIGH;

DHT11_DATA_IN;

DHT11_Delay_10us();

DHT11_Delay_10us();

DHT11_Delay_10us();

while(!DHT11_DATA_VALUE); //80us的应答信号 DHT11 TO MCU while(DHT11_DATA_VALUE); //80us的通知信号 DHT11 TO MCU

uc_DHT11Value[0] = s_ComDHT11();

uc_DHT11Value[1] = s_ComDHT11();

uc_DHT11Value[2] = s_ComDHT11();

uc_DHT11Value[3] = s_ComDHT11();

uc_DHT11Value[4] = s_ComDHT11();

if((uc_DHT11Value[0] + uc_DHT11Value[1] + uc_DHT11Value[2] + uc_DHT11Value[3]) == uc_DHT11Value[4])

{

ui_HumiValue = uc_DHT11Value[0];

ui_TempValue = uc_DHT11Value[2];

}

}

函数名称:

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入口参数的类型和含义:

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备注:

*************************************************************/ void DHT11_Delay_10us(void)

{

for(unsigned char uc_10us = 0;uc_10us < 34;uc_10us ++);

}

头文件部分

#ifndef __DHT11_H

#define __DHT11_H

#include "iostm8s105c6.h"

#ifdef __cplusplus

extern "C" {

#endif

#ifndef _G_DHT11

#define DHT11_extern extern

#else

#define DHT11_extern

#endif

/**************宏定义****************/

//#define DATA_DR PA_ODR_ODR6 //OUTPUT

//#define DATA_SR PA_IDR_IDR6 //IN STATE

#define DHT11_DATA_OUT PE_DDR_DDR3 = 1 //输出

#define DHT11_DATA_IN PE_DDR_DDR3 = 0 //输入

#define DHT11_DATA_HIGH PE_ODR_ODR3 = 1 //拉高

#define DHT11_DATA_LOW PE_ODR_ODR3 = 0 //拉低

#define DHT11_DATA_PULL_UP PE_CR1_C13 = 1 //上拉#define DHT11_DATA_FLOATING PE_CR1_C13 = 0 //浮空#define DHT11_DATA_PUSH_PULL PE_CR1_C13 = 1 //推挽#define DHT11_DATA_OPEN_DRAIN PE_CR1_C13 = 0 //开漏#define DHT11_DATA_VALUE PE_IDR_IDR3 //DQ值

#define SIZE 5

/**************接口函数***************/

unsigned char s_ComDHT11(void);

DHT11_extern void g_ReadTempAndHumi(void); void DHT11_Delay_10us(void);

#ifdef __cplusplus

}

#endif

#endif