Punctuality atom stm32 simulation IIC

#ifndef __MYIIC_H
#define __MYIIC_H
#include "sys.h"
//////////////////////////////////////////////////////////////////////////////////	 
//This program is for learning use only, and may not be used for any other purpose without the author's permission
//Mini STM32 development board
//IIC driver function	   
// Punctual atom @ALIENTEK
//Technical Forum: www.openedv.com
//Modified date: 2010/6/10
//Version: V1.0
//All rights reserved, piracy must be investigated.
//Copyright(C) Punctual Atom 2009-2019
//All rights reserved
////////////////////////////////////////////////////////////////////////////////// 	  

   	   		   
//IO direction setting
#define SDA_IN()  {GPIOB->CRH&=0XFFFF0FFF;GPIOB->CRH|=8<<12;}
#define SDA_OUT() {GPIOB->CRH&=0XFFFF0FFF;GPIOB->CRH|=3<<12;}

//IO operation function	 
#define IIC_SCL    PBout(9) //SCL
#define IIC_SDA    PBout(8) //SDA	 
#define READ_SDA PBin (8) // Imported SDA

//All operation functions of IIC
void IIC_Init(void); //Initialize the IO port of IIC				 
void IIC_Start(void); //Send IIC start signal
void IIC_Stop(void); //Send IIC stop signal
void IIC_Send_Byte(u8 txd); //IIC sends a byte
u8 IIC_Read_Byte(unsigned char ack);//IIC reads a byte
u8 IIC_Wait_Ack(void); //IIC waits for ACK signal
void IIC_Ack(void); //IIC sends ACK signal
void IIC_NAck(void); //IIC does not send ACK signal

void IIC_Write_One_Byte(u8 daddr,u8 addr,u8 data);
u8 IIC_Read_One_Byte(u8 daddr,u8 addr);	  
#endif

#include "myiic.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////	 
//This program is for learning use only, and may not be used for any other purpose without the author's permission
//Mini STM32 development board
//IIC driver function	   
// Punctual atom @ALIENTEK
//Technical Forum: www.openedv.com
//Modified date: 2010/6/10
//Version: V1.0
//All rights reserved, piracy must be investigated.
//Copyright(C) Punctual Atom 2009-2019
//All rights reserved
////////////////////////////////////////////////////////////////////////////////// 	  

//Initialize IIC
void IIC_Init(void)
{					     
	GPIO_InitTypeDef GPIO_InitStructure;
	//RCC->APB2ENR|=1<<4;//Enable peripheral IO PORTC clock first
	RCC_APB2PeriphClockCmd(	RCC_APB2Periph_GPIOB, ENABLE );	
	   
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //Push-pull output
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
 
	IIC_SCL=1;
	IIC_SDA = 1;

}
//Generate IIC start signal
void IIC_Start(void)
{
	SDA_OUT(); //sda line output
	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;//Clamp the I2C bus, ready to send or receive data
}	  
//Generate IIC stop signal
void IIC_Stop(void)
{
	SDA_OUT();//sda line output
	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;//Send I2C bus end signal
	delay_us(4);							   	
}
//Wait for the reply signal to arrive
//Return value: 1, failed to receive response
// 0, the received response is successful
u8 IIC_Wait_Ack(void)
{
	u8 ucErrTime=0;
	SDA_IN(); //SDA is set as input  
	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;//Clock output 0 	   
	return 0;  
}
//generate ACK response
void IIC_Ack(void)
{
	IIC_SCL=0;
	SDA_OUT();
	IIC_SDA = 0;
	delay_us(2);
	IIC_SCL=1;
	delay_us(2);
	IIC_SCL=0;
}
//Do not generate ACK response		    
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 sends a byte
//Return whether the slave has a response
//1, there is a response
//0, no response			  
void IIC_Send_Byte(u8 txd)
{                        
    u8 t;   
	SDA_OUT(); 	    
    IIC_SCL=0;//Pull down the clock to start data transfer
    for(t=0;t<8;t++)
    {              
        IIC_SDA=(txd&0x80)>>7;
        txd<<=1; 	  
		delay_us(2); //These three delays are required for TEA5767
		IIC_SCL=1;
		delay_us(2);
		IIC_SCL=0;	
		delay_us(2);
    }	 
} 	    
//Read 1 byte, when ack=1, send ACK, ack=0, send nACK   
u8 IIC_Read_Byte(unsigned char ack)
{
	unsigned char i,receive=0;
	SDA_IN();//SDA is set as input
    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();//Send nACK
    else
        IIC_Ack(); //Send ACK   
    return receive;
}