stm32通过I2C接口实现温湿度的采集

文章目录

  • 前言
  • 一、什么是I2C协议
    • 硬件I2C与软件I2C
  • 二 代码实现
  • 三 添加代码到工程下
    • 编译运行


前言

本文是为了学习Stm32下通过I2C测量温度与湿度


一、什么是I2C协议

1.I2C总线是由Philips公司开发的一种简单、双向二线制同步串行总线。它只需要两根线即可在连接于总线上的器件之间传送信息。
2.I2C是一个能够支持多个设备的总线,包含一条双向串行数据线SDA,一条串行时钟线SCL。每个连接到总线的设备都有一个独立的地址,主机可以通过该地址来访问不同设备。主机通过SDA线发送设备地址(SLAVE_ADDRESS)查找从机,SLAVE_ADDRESS可以是7位或10位,紧跟着SLAVE_ADDRESS的一个数据位用来表示数据传输方向,即第8位或11位。为0时表示写数据,为1时表示读数据。

因为SDA 线上的数据必须在时钟的高电平周期保持稳定,数据线的高或低电平状态只有在 SCL 线的时钟信号是低电平时才能改变。
SCL为高电平时表示有效数据,SDA为高电平表示“1”,低电平表示“0”;SCL为低电平时表示无效数据,此时SDA会进行电平切换,为下次数据表示做准备。

硬件I2C与软件I2C

硬件I2C:硬件I2C对应芯片上的I2C外设,有相应I2C驱动电路,其所使用的I2C管脚也是专用的;
软件I2C:软件I2C一般是用GPIO管脚,用软件控制管脚状态以模拟I2C通信波形
区别:硬件I2C的效率要远高于软件的,而软件I2C由于不受管脚限制,接口比较灵活。

二 代码实现

main

int main(void)
{	
	delay_init();	    	       //ÑÓʱº¯Êý³õʼ»¯    	  
	uart_init(115200);	 
	IIC_Init();
		  
	NVIC_Configuration(); 	   //ÉèÖÃNVICÖжϷÖ×é2:2λÇÀÕ¼ÓÅÏȼ¶£¬2λÏìÓ¦ÓÅÏȼ¶ 	
	OLED_Init();			         //³õʼ»¯OLED  
	OLED_Clear(0); 
	while(1)
	{
		//printf("ζÈʪ¶ÈÏÔʾ");
		read_AHT20_once();
		OLED_Clear(0); 
		delay_ms(1500);
  }
}

ustart.c

#include "sys.h"
#include "usart.h"


//STM32F103o?D?¡ã?¨¤y3¨¬
//?ao¡¥¨ºy¡ã?¡À?¨¤y3¨¬
/********** mcudev.taobao.com 3??¡¤  ********/


// 	 
//¨¨?1?¨º1¨®?ucos,?¨°¡ã¨¹¨¤¡§????¦Ì?¨ª¡¤???t?¡ä?¨¦.
#if SYSTEM_SUPPORT_UCOS
#include "includes.h"					//ucos ¨º1¨®?	  
#endif
//	 
//STM32?a¡¤¡é¡ã?
//¡ä??¨²13?¨º??¡¥		   

// 	  
 

//
//?¨®¨¨?¨°???¡ä¨²??,?¡ì3?printfo¡¥¨ºy,??2?D¨¨¨°a????use MicroLIB	  
#if 1
#pragma import(__use_no_semihosting)             
//¡À¨º¡Á??aD¨¨¨°a¦Ì??¡ì3?o¡¥¨ºy                 
struct __FILE 
{ 
	int handle; 

}; 

FILE __stdout;       
//?¡§¨°?_sys_exit()¨°?¡À¨¹?a¨º1¨®?¡ã??¡Â?¨²?¡ê¨º?    
void _sys_exit(int x) 
{ 
	x = x; 
} 
//???¡§¨°?fputco¡¥¨ºy 
int fputc(int ch, FILE *f)
{      
	while((USART1->SR&0X40)==0);//?-?¡¤¡¤¡é?¨ª,?¡À¦Ì?¡¤¡é?¨ª¨ª¨º¡À?   
    USART1->DR = (u8) ch;      
	return ch;
}
#endif 

/*¨º1¨®?microLib¦Ì?¡¤?¡¤¡§*/
 /* 
int fputc(int ch, FILE *f)
{
	USART_SendData(USART1, (uint8_t) ch);

	while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}	
   
    return ch;
}
int GetKey (void)  { 

    while (!(USART1->SR & USART_FLAG_RXNE));

    return ((int)(USART1->DR & 0x1FF));
}
*/
 
#if EN_USART1_RX   //¨¨?1?¨º1?¨¹¨¢??¨®¨º?
//¡ä??¨²1?D??¡¤t??3¨¬D¨°
//¡Á¡é¨°a,?¨¢¨¨?USARTx->SR?¨¹¡À¨¹?a?a??????¦Ì?¡ä¨ª?¨®   	
u8 USART_RX_BUF[USART_REC_LEN];     //?¨®¨º??o3?,¡Á?¡ä¨®USART_REC_LEN??¡Á??¨².
//?¨®¨º?¡Á¡ä¨¬?
//bit15¡ê?	?¨®¨º?¨ª¨º3¨¦¡À¨º??
//bit14¡ê?	?¨®¨º?¦Ì?0x0d
//bit13~0¡ê?	?¨®¨º?¦Ì?¦Ì?¨®DD¡ì¡Á??¨²¨ºy??
u16 USART_RX_STA=0;       //?¨®¨º?¡Á¡ä¨¬?¡À¨º??	  
  
void uart_init(u32 bound){
    //GPIO???¨²¨¦¨¨??
  GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);	//¨º1?¨¹USART1¡ê?GPIOA¨º¡À?¨®
     //USART1_TX   PA.9
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//?¡ä¨®?¨ª?¨ª¨¬¨º?3?
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   
    //USART1_RX	  PA.10
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//????¨º?¨¨?
    GPIO_Init(GPIOA, &GPIO_InitStructure);  

   //Usart1 NVIC ????

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//?¨¤??¨®??¨¨??3
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//¡Á¨®¨®??¨¨??3
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ¨ª¡§¦Ì¨¤¨º1?¨¹
	NVIC_Init(&NVIC_InitStructure);	//?¨´?Y???¡§¦Ì?2?¨ºy3?¨º??¡¥VIC??¡ä??¡Â
  
   //USART 3?¨º??¡¥¨¦¨¨??

	USART_InitStructure.USART_BaudRate = bound;//¨°?¡ã?¨¦¨¨???a9600;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;//¡Á?3¡è?a8??¨ºy?Y??¨º?
	USART_InitStructure.USART_StopBits = USART_StopBits_1;//¨°???¨ª¡ê?1??
	USART_InitStructure.USART_Parity = USART_Parity_No;//?T????D¡ê?¨¦??
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//?T¨®2?t¨ºy?Y¨¢¡Â????
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//¨º?¡¤¡é?¡ê¨º?

    USART_Init(USART1, &USART_InitStructure); //3?¨º??¡¥¡ä??¨²
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//?a???D??
    USART_Cmd(USART1, ENABLE);                    //¨º1?¨¹¡ä??¨² 

}



void USART1_IRQHandler(void)                	//¡ä??¨²1?D??¡¤t??3¨¬D¨°
	{
	u8 Res;
#ifdef OS_TICKS_PER_SEC	 	//¨¨?1?¨º¡À?¨®?¨²??¨ºy?¡§¨°?¨¢?,?¦Ì?¡Â¨°a¨º1¨®?ucosII¨¢?.
	OSIntEnter();    
#endif
	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //?¨®¨º??D??(?¨®¨º?¦Ì?¦Ì?¨ºy?Y¡À?D?¨º?0x0d 0x0a?¨¢?2)
		{
		Res =USART_ReceiveData(USART1);//(USART1->DR);	//?¨¢¨¨??¨®¨º?¦Ì?¦Ì?¨ºy?Y
		
		if((USART_RX_STA&0x8000)==0)//?¨®¨º??¡ä¨ª¨º3¨¦
			{
			if(USART_RX_STA&0x4000)//?¨®¨º?¦Ì?¨¢?0x0d
				{
				if(Res!=0x0a)USART_RX_STA=0;//?¨®¨º?¡ä¨ª?¨®,??D??a¨º?
				else USART_RX_STA|=0x8000;	//?¨®¨º?¨ª¨º3¨¦¨¢? 
				}
			else //?1??¨º?¦Ì?0X0D
				{	
				if(Res==0x0d)USART_RX_STA|=0x4000;
				else
					{
					USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
					USART_RX_STA++;
					if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//?¨®¨º?¨ºy?Y¡ä¨ª?¨®,??D??a¨º??¨®¨º?	  
					}		 
				}
			}   		 
     } 
#ifdef OS_TICKS_PER_SEC	 	//¨¨?1?¨º¡À?¨®?¨²??¨ºy?¡§¨°?¨¢?,?¦Ì?¡Â¨°a¨º1¨®?ucosII¨¢?.
	OSIntExit();  											 
#endif
} 
#endif	

usart.h

#ifndef __USART_H
#define __USART_H
#include "stdio.h"	
#include "sys.h" 

//STM32F103ºËÐÄ°åÀý³Ì
//¿âº¯Êý°æ±¾Àý³Ì
/********** mcudev.taobao.com ³öÆ·  ********/

//	 
//STM32¿ª·¢°å
//´®¿Ú1³õʼ»¯		   

#define USART_REC_LEN  			200  	//¶¨Òå×î´ó½ÓÊÕ×Ö½ÚÊý 200
#define EN_USART1_RX 			1		    //ʹÄÜ£¨1£©/½ûÖ¹£¨0£©´®¿Ú1½ÓÊÕ
	  	
extern u8  USART_RX_BUF[USART_REC_LEN]; //½ÓÊÕ»º³å,×î´óUSART_REC_LEN¸ö×Ö½Ú.Ä©×Ö½ÚΪ»»Ðзû 
extern u16 USART_RX_STA;         		//½ÓÊÕ״̬±ê¼Ç	
//Èç¹ûÏë´®¿ÚÖжϽÓÊÕ£¬Ç벻ҪעÊÍÒÔϺ궨Òå
void uart_init(u32 bound);
#endif


bsp_i2c.c

#include "bsp_i2c.h"
#include "delay.h"

uint8_t   ack_status=0;
uint8_t   readByte[6];
uint8_t   AHT20_status=0;

uint32_t  H1=0;  //Humility
uint32_t  T1=0;  //Temperature

uint8_t  AHT20_OutData[4];
uint8_t  AHT20sendOutData[10] = {0xFA, 0x06, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF};

void IIC_Init(void)
{					     
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(	RCC_APB2Periph_GPIOB, ENABLE );	
	   
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;   //ÍÆÍìÊä³ö
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
 
	IIC_SCL=1;
	IIC_SDA=1;
 
}
//²úÉúIICÆðʼÐźÅ
void IIC_Start(void)
{
	SDA_OUT();     //sdaÏßÊä³ö
	IIC_SDA=1;	  	  
	IIC_SCL=1;
	delay_us(4);
 	IIC_SDA=0;//START:when CLK is high,DATA change form high to low 
	delay_us(4);
	IIC_SCL=0;//ǯסI2C×ÜÏߣ¬×¼±¸·¢ËÍ»ò½ÓÊÕÊý¾Ý 
}	  
//²úÉúIICÍ£Ö¹ÐźÅ
void IIC_Stop(void)
{
	SDA_OUT();//sdaÏßÊä³ö
	IIC_SCL=0;
	IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
 	delay_us(4);
	IIC_SCL=1; 
	IIC_SDA=1;//·¢ËÍI2C×ÜÏß½áÊøÐźÅ
	delay_us(4);							   	
}
//µÈ´ýÓ¦´ðÐźŵ½À´
//·µ»ØÖµ£º1£¬½ÓÊÕÓ¦´ðʧ°Ü
//        0£¬½ÓÊÕÓ¦´ð³É¹¦
u8 IIC_Wait_Ack(void)
{
	u8 ucErrTime=0;
	SDA_IN();      //SDAÉèÖÃΪÊäÈë  
	IIC_SDA=1;delay_us(1);	   
	IIC_SCL=1;delay_us(1);	 
	while(READ_SDA)
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			IIC_Stop();
			return 1;
		}
	}
	IIC_SCL=0;//ʱÖÓÊä³ö0 	   
	return 0;  
} 
//²úÉúACKÓ¦´ð
void IIC_Ack(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA=0;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}
//²»²úÉúACKÓ¦´ð		    
void IIC_NAck(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA=1;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}					 				     
//IIC·¢ËÍÒ»¸ö×Ö½Ú
//·µ»Ø´Ó»úÓÐÎÞÓ¦´ð
//1£¬ÓÐÓ¦´ð
//0£¬ÎÞÓ¦´ð			  
void IIC_Send_Byte(u8 txd)
{                        
    u8 t;   
		SDA_OUT(); 	    
    IIC_SCL=0;//À­µÍʱÖÓ¿ªÊ¼Êý¾Ý´«Êä
    for(t=0;t<8;t++)
    {              
        IIC_SDA=(txd&0x80)>>7;
        txd<<=1; 	  
		delay_us(2);   //¶ÔTEA5767ÕâÈý¸öÑÓʱ¶¼ÊDZØÐëµÄ
		IIC_SCL=1;
		delay_us(2); 
		IIC_SCL=0;	
		delay_us(2);
    }	 
} 	    
//¶Á1¸ö×Ö½Ú£¬ack=1ʱ£¬·¢ËÍACK£¬ack=0£¬·¢ËÍnACK   
u8 IIC_Read_Byte(unsigned char ack)
{
	unsigned char i,receive=0;
	SDA_IN();//SDAÉèÖÃΪÊäÈë
  for(i=0;i<8;i++ )
	{
    IIC_SCL=0; 
    delay_us(2);
		IIC_SCL=1;
    receive<<=1;
    if(READ_SDA)receive++;   
		delay_us(1); 
  }					 
	if (!ack)
			IIC_NAck();//·¢ËÍnACK
	else
			IIC_Ack(); //·¢ËÍACK   
	return receive;
}
 
void IIC_WriteByte(uint16_t addr,uint8_t data,uint8_t device_addr)
{
	IIC_Start();  
	
	if(device_addr==0xA0) //eepromµØÖ·´óÓÚ1×Ö½Ú
		IIC_Send_Byte(0xA0 + ((addr/256)<<1));//·¢Ë͸ߵØÖ·
	else
		IIC_Send_Byte(device_addr);	    //·¢Æ÷¼þµØÖ·
	IIC_Wait_Ack(); 
	IIC_Send_Byte(addr&0xFF);   //·¢Ë͵͵ØÖ·
	IIC_Wait_Ack(); 
	IIC_Send_Byte(data);     //·¢ËÍ×Ö½Ú							   
	IIC_Wait_Ack();  		    	   
  IIC_Stop();//²úÉúÒ»¸öÍ£Ö¹Ìõ¼þ 
	if(device_addr==0xA0) //
		delay_ms(10);
	else
		delay_us(2);
}
 
uint16_t IIC_ReadByte(uint16_t addr,uint8_t device_addr,uint8_t ByteNumToRead)  //¶Á¼Ä´æÆ÷»ò¶ÁÊý¾Ý
{	
		uint16_t data;
		IIC_Start();  
		if(device_addr==0xA0)
			IIC_Send_Byte(0xA0 + ((addr/256)<<1));
		else
			IIC_Send_Byte(device_addr);	
		IIC_Wait_Ack();
		IIC_Send_Byte(addr&0xFF);   //·¢Ë͵͵ØÖ·
		IIC_Wait_Ack(); 
 
		IIC_Start();  	
		IIC_Send_Byte(device_addr+1);	    //·¢Æ÷¼þµØÖ·
		IIC_Wait_Ack();
		if(ByteNumToRead == 1)//LM75ζÈÊý¾ÝΪ11bit
		{
			data=IIC_Read_Byte(0);
		}
		else
			{
				data=IIC_Read_Byte(1);
				data=(data<<8)+IIC_Read_Byte(0);
			}
		IIC_Stop();//²úÉúÒ»¸öÍ£Ö¹Ìõ¼þ	    
		return data;
}


/**********
*ÉÏÃ沿·ÖΪIO¿ÚÄ£¿éI2CÅäÖÃ
*
*´ÓÕâÒÔÏ¿ªÊ¼ÎªAHT20µÄÅäÖÃI2C
*º¯ÊýÃûÓÐIICºÍI2CµÄÇø±ð£¬Çë×¢Ò⣡£¡£¡£¡£¡
*
*2020/2/23×îºóÐÞ¸ÄÈÕÆÚ
*
***********/
void  read_AHT20_once(void)
{
	delay_ms(10);

	reset_AHT20();
	delay_ms(10);

	init_AHT20();
	delay_ms(10);

	startMeasure_AHT20();
	delay_ms(80);

	read_AHT20();
	delay_ms(5);
}


void  reset_AHT20(void)
{

	I2C_Start();

	I2C_WriteByte(0x70);
	ack_status = Receive_ACK();
	if(ack_status) printf("1");
	else printf("1-n-");
	I2C_WriteByte(0xBA);
	ack_status = Receive_ACK();
		if(ack_status) printf("2");
	else printf("2-n-");
	I2C_Stop();

	/*
	AHT20_OutData[0] = 0;
	AHT20_OutData[1] = 0;
	AHT20_OutData[2] = 0;
	AHT20_OutData[3] = 0;
	*/
}



void  init_AHT20(void)
{
	I2C_Start();

	I2C_WriteByte(0x70);
	ack_status = Receive_ACK();
	if(ack_status) printf("3");
	else printf("3-n-");	
	I2C_WriteByte(0xE1);
	ack_status = Receive_ACK();
	if(ack_status) printf("4");
	else printf("4-n-");
	I2C_WriteByte(0x08);
	ack_status = Receive_ACK();
	if(ack_status) printf("5");
	else printf("5-n-");
	I2C_WriteByte(0x00);
	ack_status = Receive_ACK();
	if(ack_status) printf("6");
	else printf("6-n-");
	I2C_Stop();
}



void  startMeasure_AHT20(void)
{
	//------------
	I2C_Start();

	I2C_WriteByte(0x70);
	ack_status = Receive_ACK();
	if(ack_status) printf("7");
	else printf("7-n-");
	I2C_WriteByte(0xAC);
	ack_status = Receive_ACK();
	if(ack_status) printf("8");
	else printf("8-n-");
	I2C_WriteByte(0x33);
	ack_status = Receive_ACK();
	if(ack_status) printf("9");
	else printf("9-n-");
	I2C_WriteByte(0x00);
	ack_status = Receive_ACK();
	if(ack_status) printf("10");
	else printf("10-n-");
	I2C_Stop();
}



void read_AHT20(void)
{
	uint8_t   i;

	for(i=0; i<6; i++)
	{
		readByte[i]=0;
	}

	//-------------
	I2C_Start();

	I2C_WriteByte(0x71);
	ack_status = Receive_ACK();
	readByte[0]= I2C_ReadByte();
	Send_ACK();

	readByte[1]= I2C_ReadByte();
	Send_ACK();

	readByte[2]= I2C_ReadByte();
	Send_ACK();

	readByte[3]= I2C_ReadByte();
	Send_ACK();

	readByte[4]= I2C_ReadByte();
	Send_ACK();

	readByte[5]= I2C_ReadByte();
	SendNot_Ack();
	//Send_ACK();

	I2C_Stop();

	//--------------
	if( (readByte[0] & 0x68) == 0x08 )
	{
		H1 = readByte[1];
		H1 = (H1<<8) | readByte[2];
		H1 = (H1<<8) | readByte[3];
		H1 = H1>>4;

		H1 = (H1*1000)/1024/1024;

		T1 = readByte[3];
		T1 = T1 & 0x0000000F;
		T1 = (T1<<8) | readByte[4];
		T1 = (T1<<8) | readByte[5];

		T1 = (T1*2000)/1024/1024 - 500;

		AHT20_OutData[0] = (H1>>8) & 0x000000FF;
		AHT20_OutData[1] = H1 & 0x000000FF;

		AHT20_OutData[2] = (T1>>8) & 0x000000FF;
		AHT20_OutData[3] = T1 & 0x000000FF;
	}
	else
	{
		AHT20_OutData[0] = 0xFF;
		AHT20_OutData[1] = 0xFF;

		AHT20_OutData[2] = 0xFF;
		AHT20_OutData[3] = 0xFF;
		printf("ʧ°ÜÁË");

	}
	printf("\r\n");
	printf("ζÈ:%d%d.%d",T1/100,(T1/10)%10,T1%10);
	printf("ʪ¶È:%d%d.%d",H1/100,(H1/10)%10,H1%10);
	printf("\r\n");
}




uint8_t  Receive_ACK(void)
{
	uint8_t result=0;
	uint8_t cnt=0;

	IIC_SCL = 0;
	SDA_IN(); 
	delay_us(4);

	IIC_SCL = 1;
	delay_us(4);

	while(READ_SDA && (cnt<100))
	{
		cnt++;
	}

	IIC_SCL = 0;
	delay_us(4);

	if(cnt<100)
	{
		result=1;
	}
	return result;
}



void  Send_ACK(void)
{
	SDA_OUT();
	IIC_SCL = 0;
	delay_us(4);

	IIC_SDA = 0;
	delay_us(4);

	IIC_SCL = 1;
	delay_us(4);
	IIC_SCL = 0;
	delay_us(4);

	SDA_IN();
}



void  SendNot_Ack(void)
{
	SDA_OUT();
	IIC_SCL = 0;
	delay_us(4);

	IIC_SDA = 1;
	delay_us(4);

	IIC_SCL = 1;
	delay_us(4);

	IIC_SCL = 0;
	delay_us(4);

	IIC_SDA = 0;
	delay_us(4);
}


void I2C_WriteByte(uint8_t  input)
{
	uint8_t  i;
	SDA_OUT();
	for(i=0; i<8; i++)
	{
		IIC_SCL = 0;
		delay_ms(5);

		if(input & 0x80)
		{
			IIC_SDA = 1;
			//delaymm(10);
		}
		else
		{
			IIC_SDA = 0;
			//delaymm(10);
		}

		IIC_SCL = 1;
		delay_ms(5);

		input = (input<<1);
	}

	IIC_SCL = 0;
	delay_us(4);

	SDA_IN();
	delay_us(4);
}	


uint8_t I2C_ReadByte(void)
{
	uint8_t  resultByte=0;
	uint8_t  i=0, a=0;

	IIC_SCL = 0;
	SDA_IN();
	delay_ms(4);

	for(i=0; i<8; i++)
	{
		IIC_SCL = 1;
		delay_ms(3);

		a=0;
		if(READ_SDA)
		{
			a=1;
		}
		else
		{
			a=0;
		}

		//resultByte = resultByte | a;
		resultByte = (resultByte << 1) | a;

		IIC_SCL = 0;
		delay_ms(3);
	}

	SDA_IN();
	delay_ms(10);

	return   resultByte;
}


void  set_AHT20sendOutData(void)
{
	/* --------------------------
	 * 0xFA 0x06 0x0A temperature(2 Bytes) humility(2Bytes) short Address(2 Bytes)
	 * And Check (1 byte)
	 * -------------------------*/
	AHT20sendOutData[3] = AHT20_OutData[0];
	AHT20sendOutData[4] = AHT20_OutData[1];
	AHT20sendOutData[5] = AHT20_OutData[2];
	AHT20sendOutData[6] = AHT20_OutData[3];

//	AHT20sendOutData[7] = (drf1609.shortAddress >> 8) & 0x00FF;
//	AHT20sendOutData[8] = drf1609.shortAddress  & 0x00FF;

//	AHT20sendOutData[9] = getXY(AHT20sendOutData,10);
}


void  I2C_Start(void)
{
	SDA_OUT();
	IIC_SCL = 1;
	delay_ms(4);

	IIC_SDA = 1;
	delay_ms(4);
	IIC_SDA = 0;
	delay_ms(4);

	IIC_SCL = 0;
	delay_ms(4);
}



void  I2C_Stop(void)
{
	SDA_OUT();
	IIC_SDA = 0;
	delay_ms(4);

	IIC_SCL = 1;
	delay_ms(4);

	IIC_SDA = 1;
	delay_ms(4);
}


delay.c

#include "delay.h"
#include "sys.h"

//STM32F103ºËÐÄ°åÀý³Ì
//¿âº¯Êý°æ±¾Àý³Ì
/********** mcudev.taobao.com ³öÆ·  ********/


// 	 
//Èç¹ûʹÓÃucos,Ôò°üÀ¨ÏÂÃæµÄÍ·Îļþ¼´¿É.
#if SYSTEM_SUPPORT_UCOS
#include "includes.h"					//ucos ʹÓÃ	  
#endif
//	 

//STM32¿ª·¢°å
//ʹÓÃSysTickµÄÆÕͨ¼ÆÊýģʽ¶ÔÑÓ³Ù½øÐйÜÀí
//°üÀ¨delay_us,delay_ms

// 	 
static u8  fac_us=0;//usÑÓʱ±¶³ËÊý
static u16 fac_ms=0;//msÑÓʱ±¶³ËÊý
#ifdef OS_CRITICAL_METHOD 	//Èç¹ûOS_CRITICAL_METHOD¶¨ÒåÁË,˵Ã÷ʹÓÃucosIIÁË.
//systickÖжϷþÎñº¯Êý,ʹÓÃucosʱÓõ½
void SysTick_Handler(void)
{				   
	OSIntEnter();		//½øÈëÖжÏ
    OSTimeTick();       //µ÷ÓÃucosµÄʱÖÓ·þÎñ³ÌÐò               
    OSIntExit();        //´¥·¢ÈÎÎñÇл»ÈíÖжÏ
}
#endif

//³õʼ»¯ÑÓ³Ùº¯Êý
//µ±Ê¹ÓÃucosµÄʱºò,´Ëº¯Êý»á³õʼ»¯ucosµÄʱÖÓ½ÚÅÄ
//SYSTICKµÄʱÖӹ̶¨ÎªHCLKʱÖÓµÄ1/8
//SYSCLK:ϵͳʱÖÓ
void delay_init()	 
{

#ifdef OS_CRITICAL_METHOD 	//Èç¹ûOS_CRITICAL_METHOD¶¨ÒåÁË,˵Ã÷ʹÓÃucosIIÁË.
	u32 reload;
#endif
	SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);	//Ñ¡ÔñÍⲿʱÖÓ  HCLK/8
	fac_us=SystemCoreClock/8000000;	//ΪϵͳʱÖÓµÄ1/8  
	 
#ifdef OS_CRITICAL_METHOD 	//Èç¹ûOS_CRITICAL_METHOD¶¨ÒåÁË,˵Ã÷ʹÓÃucosIIÁË.
	reload=SystemCoreClock/8000000;		//ÿÃëÖӵļÆÊý´ÎÊý µ¥Î»ÎªK	   
	reload*=1000000/OS_TICKS_PER_SEC;//¸ù¾ÝOS_TICKS_PER_SECÉ趨Òç³öʱ¼ä
							//reloadΪ24λ¼Ä´æÆ÷,×î´óÖµ:16777216,ÔÚ72MÏÂ,Ô¼ºÏ1.86s×óÓÒ	
	fac_ms=1000/OS_TICKS_PER_SEC;//´ú±íucos¿ÉÒÔÑÓʱµÄ×îÉÙµ¥Î»	   
	SysTick->CTRL|=SysTick_CTRL_TICKINT_Msk;   	//¿ªÆôSYSTICKÖжÏ
	SysTick->LOAD=reload; 	//ÿ1/OS_TICKS_PER_SECÃëÖжÏÒ»´Î	
	SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk;   	//¿ªÆôSYSTICK    
#else
	fac_ms=(u16)fac_us*1000;//·ÇucosÏÂ,´ú±íÿ¸ömsÐèÒªµÄsystickʱÖÓÊý   
#endif
}								    

#ifdef OS_CRITICAL_METHOD	//ʹÓÃÁËucos
//ÑÓʱnus
//nusΪҪÑÓʱµÄusÊý.		    								   
void delay_us(u32 nus)
{		
	u32 ticks;
	u32 told,tnow,tcnt=0;
	u32 reload=SysTick->LOAD;	//LOADµÄÖµ	    	 
	ticks=nus*fac_us; 			//ÐèÒªµÄ½ÚÅÄÊý	  		 
	tcnt=0;
	told=SysTick->VAL;        	//¸Õ½øÈëʱµÄ¼ÆÊýÆ÷Öµ
	while(1)
	{
		tnow=SysTick->VAL;	
		if(tnow!=told)
		{	    
			if(tnow<told)tcnt+=told-tnow;//ÕâÀï×¢ÒâÒ»ÏÂSYSTICKÊÇÒ»¸öµÝ¼õµÄ¼ÆÊýÆ÷¾Í¿ÉÒÔÁË.
			else tcnt+=reload-tnow+told;	    
			told=tnow;
			if(tcnt>=ticks)break;//ʱ¼ä³¬¹ý/µÈÓÚÒªÑÓ³ÙµÄʱ¼ä,ÔòÍ˳ö.
		}  
	}; 									    
}
//ÑÓʱnms
//nms:ÒªÑÓʱµÄmsÊý
void delay_ms(u16 nms)
{	
	if(OSRunning==TRUE)//Èç¹ûosÒѾ­ÔÚÅÜÁË	    
	{		  
		if(nms>=fac_ms)//ÑÓʱµÄʱ¼ä´óÓÚucosµÄ×îÉÙʱ¼äÖÜÆÚ 
		{
   			OSTimeDly(nms/fac_ms);//ucosÑÓʱ
		}
		nms%=fac_ms;				//ucosÒѾ­ÎÞ·¨ÌṩÕâôСµÄÑÓʱÁË,²ÉÓÃÆÕͨ·½Ê½ÑÓʱ    
	}
	delay_us((u32)(nms*1000));	//ÆÕͨ·½Ê½ÑÓʱ,´ËʱucosÎÞ·¨Æô¶¯µ÷¶È.
}
#else//²»ÓÃucosʱ
//ÑÓʱnus
//nusΪҪÑÓʱµÄusÊý.		    								   
void delay_us(u32 nus)
{		
	u32 temp;	    	 
	SysTick->LOAD=nus*fac_us; //ʱ¼ä¼ÓÔØ	  		 
	SysTick->VAL=0x00;        //Çå¿Õ¼ÆÊýÆ÷
	SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;          //¿ªÊ¼µ¹Êý	 
	do
	{
		temp=SysTick->CTRL;
	}
	while(temp&0x01&&!(temp&(1<<16)));//µÈ´ýʱ¼äµ½´ï   
	SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;       //¹Ø±Õ¼ÆÊýÆ÷
	SysTick->VAL =0X00;       //Çå¿Õ¼ÆÊýÆ÷	 
}
//ÑÓʱnms
//×¢ÒânmsµÄ·¶Î§
//SysTick->LOADΪ24λ¼Ä´æÆ÷,ËùÒÔ,×î´óÑÓʱΪ:
//nms<=0xffffff*8*1000/SYSCLK
//SYSCLKµ¥Î»ÎªHz,nmsµ¥Î»Îªms
//¶Ô72MÌõ¼þÏÂ,nms<=1864 
void delay_ms(u16 nms)
{	 		  	  
	u32 temp;		   
	SysTick->LOAD=(u32)nms*fac_ms;//ʱ¼ä¼ÓÔØ(SysTick->LOADΪ24bit)
	SysTick->VAL =0x00;           //Çå¿Õ¼ÆÊýÆ÷
	SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;          //¿ªÊ¼µ¹Êý  
	do
	{
		temp=SysTick->CTRL;
	}
	while(temp&0x01&&!(temp&(1<<16)));//µÈ´ýʱ¼äµ½´ï   
	SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;       //¹Ø±Õ¼ÆÊýÆ÷
	SysTick->VAL =0X00;       //Çå¿Õ¼ÆÊýÆ÷	  	    
} 
#endif

sys.c

#include "sys.h"


//STM32F103ºËÐÄ°åÀý³Ì
//¿âº¯Êý°æ±¾Àý³Ì
/********** mcudev.taobao.com ³öÆ·  ********/

//	 

//STM32¿ª·¢°å
//ϵͳÖжϷÖ×éÉèÖû¯		   

//********************************************************************************  
void NVIC_Configuration(void)
{

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);	//ÉèÖÃNVICÖжϷÖ×é2:2λÇÀÕ¼ÓÅÏȼ¶£¬2λÏìÓ¦ÓÅÏȼ¶

}


sys.h

#ifndef __SYS_H
#define __SYS_H	
#include "stm32f10x.h"
//	 


//STM32F103ºËÐÄ°åÀý³Ì
//¿âº¯Êý°æ±¾Àý³Ì
/********** mcudev.taobao.com ³öÆ·  ********/



// 	 

//0,²»Ö§³Öucos
//1,Ö§³Öucos
#define SYSTEM_SUPPORT_UCOS		0		//¶¨ÒåϵͳÎļþ¼ÐÊÇ·ñÖ§³ÖUCOS
																	    
	 
//λ´ø²Ù×÷,ʵÏÖ51ÀàËƵÄGPIO¿ØÖƹ¦ÄÜ
//¾ßÌåʵÏÖ˼Ïë,²Î¿¼<>µÚÎåÕÂ(87Ò³~92Ò³).
//IO¿Ú²Ù×÷ºê¶¨Òå
#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 
#define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr)) 
#define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum)) 
//IO¿ÚµØÖ·Ó³Éä
#define GPIOA_ODR_Addr    (GPIOA_BASE+12) //0x4001080C 
#define GPIOB_ODR_Addr    (GPIOB_BASE+12) //0x40010C0C 
#define GPIOC_ODR_Addr    (GPIOC_BASE+12) //0x4001100C 
#define GPIOD_ODR_Addr    (GPIOD_BASE+12) //0x4001140C 
#define GPIOE_ODR_Addr    (GPIOE_BASE+12) //0x4001180C 
#define GPIOF_ODR_Addr    (GPIOF_BASE+12) //0x40011A0C    
#define GPIOG_ODR_Addr    (GPIOG_BASE+12) //0x40011E0C    

#define GPIOA_IDR_Addr    (GPIOA_BASE+8) //0x40010808 
#define GPIOB_IDR_Addr    (GPIOB_BASE+8) //0x40010C08 
#define GPIOC_IDR_Addr    (GPIOC_BASE+8) //0x40011008 
#define GPIOD_IDR_Addr    (GPIOD_BASE+8) //0x40011408 
#define GPIOE_IDR_Addr    (GPIOE_BASE+8) //0x40011808 
#define GPIOF_IDR_Addr    (GPIOF_BASE+8) //0x40011A08 
#define GPIOG_IDR_Addr    (GPIOG_BASE+8) //0x40011E08 
 
//IO¿Ú²Ù×÷,Ö»¶Ôµ¥Ò»µÄIO¿Ú!
//È·±£nµÄֵСÓÚ16!
#define PAout(n)   BIT_ADDR(GPIOA_ODR_Addr,n)  //Êä³ö 
#define PAin(n)    BIT_ADDR(GPIOA_IDR_Addr,n)  //ÊäÈë 

#define PBout(n)   BIT_ADDR(GPIOB_ODR_Addr,n)  //Êä³ö 
#define PBin(n)    BIT_ADDR(GPIOB_IDR_Addr,n)  //ÊäÈë 

#define PCout(n)   BIT_ADDR(GPIOC_ODR_Addr,n)  //Êä³ö 
#define PCin(n)    BIT_ADDR(GPIOC_IDR_Addr,n)  //ÊäÈë 

#define PDout(n)   BIT_ADDR(GPIOD_ODR_Addr,n)  //Êä³ö 
#define PDin(n)    BIT_ADDR(GPIOD_IDR_Addr,n)  //ÊäÈë 

#define PEout(n)   BIT_ADDR(GPIOE_ODR_Addr,n)  //Êä³ö 
#define PEin(n)    BIT_ADDR(GPIOE_IDR_Addr,n)  //ÊäÈë

#define PFout(n)   BIT_ADDR(GPIOF_ODR_Addr,n)  //Êä³ö 
#define PFin(n)    BIT_ADDR(GPIOF_IDR_Addr,n)  //ÊäÈë

#define PGout(n)   BIT_ADDR(GPIOG_ODR_Addr,n)  //Êä³ö 
#define PGin(n)    BIT_ADDR(GPIOG_IDR_Addr,n)  //ÊäÈë



void NVIC_Configuration(void);



#endif


三 添加代码到工程下

stm32通过I2C接口实现温湿度的采集_第1张图片

编译运行

编译后把产生的hex文件烧录到stm32中,打开串口调试助手,即可看到实验结果。
在这里插入图片描述
演示

stm32

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