嵌入式-软件模拟I2C通信

使用软件模拟I2C通信，扩展I2C资源

/*********************************************************************************
*
*
* 软件模拟I2C通信的接口
* author：jindouliu2024@163.com 
* date：2025.4.10
* 
*
* Copyright (c)  2024-2025   jindouliu2024@163.com   All right Reserved
* *********************************************************************************/

I2C.c

#include "stm32f10x.h"                  // Device header

void myi2c_w_scl(uint8_t bitvalue)
{
	GPIO_WriteBit(GPIOB,GPIO_Pin_10,(BitAction)bitvalue);
}
void myi2c_w_sda(uint8_t bitvalue)
{
	GPIO_WriteBit(GPIOB,GPIO_Pin_11,(BitAction)bitvalue);
}

uint8_t myi2c_r_sda()
{
	uint8_t readbit;
	readbit=GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_11);
	return readbit;
}

void myi2c_Init()
{
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);	
	GPIO_InitTypeDef GPIO_InitStructure;					
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;		
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_11;				
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;		
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	GPIO_SetBits(GPIOB,GPIO_Pin_11|GPIO_Pin_10);
}

void myi2c_start()
{
	myi2c_w_sda(1);
	myi2c_w_scl(1);
	myi2c_w_sda(0);
	myi2c_w_scl(0);
}
void myi2c_end()
{
	myi2c_w_sda(0);
	myi2c_w_scl(1);
	myi2c_w_sda(1);
	
}
void myi2c_sendbyte(uint8_t byte)
{
	uint8_t i;
	
	for(i=0;i<8;i++)
	{
		myi2c_w_sda(byte&(0x80>>i));
		myi2c_w_scl(1);
		myi2c_w_scl(0);
	}
}

uint8_t myi2c_receivebyte()
{
	uint8_t i,byte=0x00;
	myi2c_w_sda(1);
	for(i=0;i<8;i++)
	{
		myi2c_w_scl(1);
		if(myi2c_r_sda()==1){byte |=(0x80>>i);}
		myi2c_w_scl(0);
	}
	return byte;
}
void myi2c_sendack(uint8_t ack)
{
	
	
	myi2c_w_sda(ack);
	myi2c_w_scl(1);
	myi2c_w_scl(0);
	
}
uint8_t myi2c_receiveack()
{
	uint8_t ack;
	myi2c_w_sda(1);
	myi2c_w_scl(1);
	ack = myi2c_r_sda();
	myi2c_w_scl(0);
	
	return ack;
}	
	
		
		

I2C.h

#ifndef __MYI2C_H
#define __MYI2C_H
void myi2c_Init();
void myi2c_start();
void myi2c_end();
void myi2c_sendbyte(uint8_t byte);
uint8_t myi2c_receivebyte();
void myi2c_sendack(uint8_t ack);
uint8_t myi2c_receiveack();

#endif