STM32F103,HAL实现软件I2C，与硬件I2C

1,硬件I2C

HAL_I2C_Mem_Write(&hi2c1,0x88,0,I2C_MEMADD_SIZE_8BIT,0,0,0X10);//写

HAL_I2C_Master_Receive(&hi2c1,0x89,(uint8_t*)datatemp,4,0x10);//读

2 软件I2C

#ifndef __MYI2C_H__
#define __MYI2C_H__

#include "stm32f1xx_hal.h"
#include "main.h"
#include "stdint.h"

#define CPU_FREQUENCY_MHZ  72
#define MYI2C_SCL_PIN	  	I2C_SCL_Pin
#define MYI2C_SCL_PORT		I2C_SCL_GPIO_Port
#define MYI2C_SDA_PIN			I2C_SDL_Pin
#define MYI2C_SDA_PORT		I2C_SDL_GPIO_Port

#define SDA_Dout_LOW()                          HAL_GPIO_WritePin(MYI2C_SDA_PORT,MYI2C_SDA_PIN,GPIO_PIN_RESET) 
#define SDA_Dout_HIGH()                         HAL_GPIO_WritePin(MYI2C_SDA_PORT,MYI2C_SDA_PIN,GPIO_PIN_SET)
#define SDA_Data_IN()                           HAL_GPIO_ReadPin(MYI2C_SDA_PORT,MYI2C_SDA_PIN)
#define SCL_Dout_LOW()                          HAL_GPIO_WritePin(MYI2C_SCL_PORT,MYI2C_SCL_PIN,GPIO_PIN_RESET) 
#define SCL_Dout_HIGH()                         HAL_GPIO_WritePin(MYI2C_SCL_PORT,MYI2C_SCL_PIN,GPIO_PIN_SET)
#define SCL_Data_IN()                           HAL_GPIO_ReadPin(MYI2C_SCL_PORT,MYI2C_SCL_PIN)
#define SDA_Write(XX)   												HAL_GPIO_WritePin(MYI2C_SDA_PORT,MYI2C_SDA_PIN,(XX?GPIO_PIN_SET:GPIO_PIN_RESET))

void 			I2C_Init(void);
void 			I2C_Start(void);
void 			I2C_Stop(void);
void 			I2C_Send_Byte(uint8_t txd); 
uint8_t 	    I2C_Read_Byte(uint8_t ack);
void 			I2C_NAck(void);
void 			I2C_Ack(void);
uint8_t 	    I2C_Wait_Ack(void);




void delay_xus(__IO uint32_t nTime);


#define Delay_us(xx)  delay_xus(xx)

#endif

#include "myi2c.h"



void delay_xus(__IO uint32_t nTime)
{
    int old_val,new_val,val;

    if(nTime > 900)
    {
        for(old_val = 0; old_val < nTime/900; old_val++)
        {
            delay_xus(900);
        }
        nTime = nTime%900;
    }

    old_val = SysTick->VAL;
    new_val = old_val - CPU_FREQUENCY_MHZ*nTime;
    if(new_val >= 0)
    {
        do
        {
            val = SysTick->VAL;
        }
        while((val < old_val)&&(val >= new_val));
    }
    else
    {
        new_val +=CPU_FREQUENCY_MHZ*1000;
        do
        {
            val = SysTick->VAL;
        }
        while((val <= old_val)||(val > new_val));

    }
}

//--------------------------------------------
void SDA_Output(void)
{
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.Pin = MYI2C_SDA_PIN;
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitStruct.Speed =GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(MYI2C_SDA_PORT,&GPIO_InitStruct);
}


void SDA_Input(void)
{
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.Pin = MYI2C_SDA_PIN;
	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
	GPIO_InitStruct.Speed =GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(MYI2C_SDA_PORT,&GPIO_InitStruct);
}

void SCL_Output(void)
{
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.Pin = MYI2C_SCL_PIN;
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitStruct.Speed =GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(MYI2C_SCL_PORT,&GPIO_InitStruct);
}


void SCL_Input(void)
{
	GPIO_InitTypeDef GPIO_InitStruct;
	GPIO_InitStruct.Pin = MYI2C_SCL_PIN;
	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
	GPIO_InitStruct.Speed =GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(MYI2C_SCL_PORT,&GPIO_InitStruct);	
}




void I2C_Init(void)
{
	
	SCL_Output();
	SDA_Output();
	SCL_Dout_HIGH();
	SDA_Dout_HIGH();
}


//产生IIC起始信号

void I2C_Start(void)
{
	SDA_Output();
	SDA_Dout_HIGH();
	SCL_Dout_HIGH();
	Delay_us(4);
	SDA_Dout_LOW();
	Delay_us(4);
	SCL_Dout_LOW();
}

  
//产生IIC停止信号

void I2C_Stop(void)
{
	SDA_Output();
	SCL_Dout_LOW();
	SDA_Dout_LOW();
	Delay_us(4);
	SCL_Dout_HIGH();
	SDA_Dout_HIGH();
	Delay_us(4);						   	
}

uint8_t I2C_Wait_Ack(void)
{
	uint8_t ucErrTime=0;
	SDA_Input();
	SDA_Dout_HIGH();Delay_us(1);	   
	SCL_Dout_HIGH();Delay_us(1);	 
	while(SDA_Data_IN())
	{
		ucErrTime++;
		if(ucErrTime>250)
		{
			I2C_Stop();
			return 1;
		}
	}
	SCL_Dout_LOW();//时钟输出0 	   
	return 0; 
}

//产生ACK应答

void I2C_Ack(void)
{
	SCL_Dout_LOW();
	SDA_Output();
	SDA_Dout_LOW();
	Delay_us(2);
	SCL_Dout_HIGH();
	Delay_us(2);
	SCL_Dout_LOW();
}

//不产生ACK应答		  

void I2C_NAck(void)
{
	SCL_Dout_LOW();
	SDA_Output();
	SDA_Dout_HIGH();
	Delay_us(2);
	SCL_Dout_HIGH();
	Delay_us(2);
	SCL_Dout_LOW();
}					 				     
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答	
void I2C_Send_Byte(uint8_t txd) 
{                        
	uint8_t t;      
	//拉低时钟开始数据传输
	SDA_Output();
	SCL_Dout_LOW();
	for(t=0;t<8;t++)
	{  
		SDA_Write((txd&0x80)>>7);		   
		txd<<=1; 	  
		Delay_us(5);   //对TEA5767这三个延时都是必须的
		SCL_Dout_HIGH();
		Delay_us(5); 	
		SCL_Dout_LOW();
		//Delay_us(2);
  }	 
} 	    
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK   
uint8_t I2C_Read_Byte(uint8_t ack)
{
	unsigned char i,receive=0;
	//SDA设置为输入
	SDA_Input();
  for(i=0;i<8;i++ )
	{
		SCL_Dout_LOW();
		Delay_us(5);
		SCL_Dout_HIGH();
		receive<<=1;
		if(SDA_Data_IN())receive++;   
		Delay_us(5); 
  }					 
  if(!ack)I2C_NAck();//发送nACK
  else  I2C_Ack(); //发送ACK   
  
	return receive;
}




 

完整工程​