初始化GPIOB11

//对于stm32来说，是输入
void DH11_GPIO_Init_IN(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	
	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IN_FLOATING; //浮空输入
	GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	
	GPIO_Init(GPIOB, &GPIO_InitStructure);

}

//对于stm32来说，是输出
void DH11_GPIO_Init_OUT(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	
	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP; //推挽输出
	GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	
	GPIO_Init(GPIOB, &GPIO_InitStructure);

}

启动DHT11

#define read0 GPIO_ResetBits(GPIOB, GPIO_Pin_11)
#define read1 GPIO_SetBits(GPIOB, GPIO_Pin_11)

void DHT11_Start(void)
{
	DH11_GPIO_Init_OUT(); //输出模式
	
	read1; //先拉高
	delay_us(30);
	
	read0; //拉低电平至少18us
	delay_ms(20);
	
	read1; //拉高电平20~40us
	delay_us(30);
	
	DH11_GPIO_Init_IN(); //输入模式
}

获取一个字节

#define Read_Data GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11)

unsigned char DHT11_Rec_Byte(void)
{
	unsigned char i = 0;
	unsigned char data;
	
	for(i=0;i<8;i++) //1个数据就是1个字节byte，1个字节byte有8位bit
	{
		while( Read_Data == 0); //从1bit开始，低电平变高电平，等待低电平结束
		delay_us(30); //延迟30us是为了区别数据0和数据1，0只有26~28us
		
		data <<= 1; //左移
		
		if( Read_Data == 1 ) //如果过了30us还是高电平的话就是数据1
		{
			data |= 1; //数据+1
			//data += 1;
		}
		
		while( Read_Data == 1 ); //高电平变低电平，等待高电平结束
	}
	
	return data;
}

获取数据

void DH11_REC_Data(void)
{
	unsigned int R_H,R_L,T_H,T_L;
	unsigned char RH,RL,TH,TL,CHECK;
	
	DH11_Start(); //主机发送信号
	read1; //拉高电平
	
	if( Read_Data == 0 ) //判断DHT11是否响应
	{
		while( Read_Data == 0); //低电平变高电平，等待低电平结束
		while( Read_Data == 1); //高电平变低电平，等待高电平结束
		
		R_H = DHT11_REC_Byte();
		R_L = DHT11_REC_Byte();
		T_H = DHT11_REC_Byte();
		T_L = DHT11_REC_Byte();
		CHECK = DHT11_REC_Byte(); //接收5个数据
		
		read0; //当最后一bit数据传送完毕后，DHT11拉低总线 50us
		delay_us(55); //这里延时55us
		read1; //随后总线由上拉电阻拉高进入空闲状态。
		
		if(R_H + R_L + T_H + T_L == CHECK) //和检验位对比，判断校验接收到的数据是否正确
		{
			RH = R_H;
			RL = R_L;
			TH = T_H;
			TL = T_L;
		}
	}
	rec_data[0] = RH;
	rec_data[1] = RL;
	rec_data[2] = TH;
	rec_data[3] = TL;
}

代码整合

DHT11.h

#ifndef _DHT11_H_
#define _DHT11_H_

#include "stm32f10x.h"

#define read0 GPIO_ResetBits(GPIOB, GPIO_Pin_11)
#define read1 GPIO_SetBits(GPIOB, GPIO_Pin_11)
#define Read_Data GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_11)

void DHT11_GPIO_Init_IN(void);
void DHT11_GPIO_Init_OUT(void);
void DHT11_Start(void);
unsigned char DHT11_REC_Byte(void);
void DHT11_REC_Data(void);

DHT11.c

#include "DHT11.h"
#include "SysTick.h"
#include "stm32f10x.h"

unsigned int rec_data[4];

//对于stm32来说，是输入
void DHT11_GPIO_Init_IN(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	
	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IN_FLOATING;
	GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	
	GPIO_Init(GPIOB, &GPIO_InitStructure);

}

//对于stm32来说，是输出
void DHT11_GPIO_Init_OUT(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	
	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;
	GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	
	GPIO_Init(GPIOB, &GPIO_InitStructure);

}

void DHT11_Start(void)
{
	DHT11_GPIO_Init_OUT();
	
	read1;
	delay_us(30);
	
	read0;
	delay_ms(20);
	
	read1;
	delay_us(30);
	
	DHT11_GPIO_Init_IN();
	
}

unsigned char DHT11_REC_Byte(void)
{
	unsigned char i = 0;
	unsigned char data;
	
	for(i=0;i<8;i++)
	{
		while(Read_Data == 0);
		delay_us(30);
		
		data <<= 1;
		
		if(Read_Data == 1)
		{
			data += 1;
		}
		
		while(Read_Data == 1);
	}
	
	return data;
}

void DHT11_REC_Data(void)
{
	unsigned int R_H,R_L,T_H,T_L;
	unsigned char RH,RL,TH,TL,CHECK;
	
	DHT11_Start();
	read1;
	
	if(Read_Data == 0)
	{
		while(Read_Data == 0);
		while(Read_Data == 1);
		
		R_H = DHT11_REC_Byte();
		R_L = DHT11_REC_Byte();
		T_H = DHT11_REC_Byte();
		T_L = DHT11_REC_Byte();
		CHECK = DHT11_REC_Byte();
		
		read0;
		delay_us(55);
		read1;
		
		if(R_H + R_L + T_H + T_L == CHECK)
		{
			RH = R_H;
			RL = R_L;
			TH = T_H;
			TL = T_L;
		}
	}
	
	rec_data[0] = RH;
	rec_data[1] = RL;
	rec_data[2] = TH;
	rec_data[3] = TL;
}

oled.h

在15. STM32——软件IIC驱动OLED屏幕显示字符、字符串、数字、汉字中有

oled.c

在15. STM32——软件IIC驱动OLED屏幕显示字符、字符串、数字、汉字中有

main.c

#include "stm32f10x.h"
#include "main.h"
#include "led.h"
#include "shake.h"
#include "relay.h"
#include "exti.h"
#include "usart.h"
#include "tim.h"
#include "motor.h"
#include "SysTick.h"
#include "HC_SR04.h"
#include "oled.h"
#include "DHT11.h"

extern unsigned int rec_data[4];

int main()
{
	delay_ms(1000);
	
	OLED_Init();
	OLED_Clear();
	delay_ms(1000);
	
	//起手让OLED显示下列一些字
	OLED_ShowChinese(0,2,6);		//当	
	OLED_ShowChinese(16,2,7);		//前
	OLED_ShowChinese(32,2,8);		//温
	OLED_ShowChinese(48,2,9);		//度
	OLED_ShowChinese(64,2,10);		//:
	OLED_ShowChinese(90,2,15);		//.
	OLED_ShowChinese(112,2,11);		//℃
	//这种都来自于字库文件 oledfont.h
	OLED_ShowChinese(0,5,6);		//当
	OLED_ShowChinese(16,5,7);		//前
	OLED_ShowChinese(32,5,12);		//湿
	OLED_ShowChinese(48,5,9);		//度
	OLED_ShowChinese(64,5,10);		//:
	OLED_ShowChinese(90,5,15);		//.
	OLED_ShowChinese(112,5,13);		//%

	while(1)
	{
		delay_ms(1000); //1s更新一次数据
		
		DHT11_REC_Data(); //接收温度和湿度的数据
		
		OLED_ShowNum(74,2,rec_data[2],2,16);
		OLED_ShowNum(98,2,rec_data[3],1,16);
		OLED_ShowNum(74,5,rec_data[0],2,16);
		OLED_ShowNum(98,5,rec_data[1],2,16);
		
	}
}