模拟I2C主机（CH579 CH573 CH582）

#include "I2C.h"


//模拟IIC初始化
void I2CInit(void)
{
    SCL_out;        
    SDA_out;        
}


void I2C_delay(void)
{
   mDelayuS(100);
}

int I2C_Start(void)
{
    SDA_H;
    SDA_out;        
    SCL_H;
    I2C_delay();
    if(!SDA_read)return 0;    //SDA线为低电平则总线忙,退出
    SDA_L;
    I2C_delay();
    if(SDA_read) return 0;    //SDA线为高电平则总线出错,退出
    SDA_L;
    I2C_delay();
    return 1;    
}

void I2C_Stop(void)
{
    SCL_L;
    I2C_delay();
    SDA_L;
    SDA_out;        
    I2C_delay();
    SCL_H;
    I2C_delay();
    SDA_H;
    I2C_delay();
} 

void I2C_Ack(void)
{    
    SCL_L;
    I2C_delay();
    SDA_L;
    SDA_out;        
    I2C_delay();
    SCL_H;
    I2C_delay();
    I2C_delay();
    SCL_L;
    I2C_delay();
}   

void I2C_NoAck(void)
{    
    SCL_L;
    I2C_delay();
    SDA_H;
    SDA_out;        
    I2C_delay();
    SCL_H;
    I2C_delay();
    SCL_L;
    I2C_delay();
} 

int I2C_WaitAck(void)      //返回为:=1有ACK,=0无ACK
{
    SCL_L;
    I2C_delay();
    I2C_delay();
    SDA_in;
    SCL_H;        
    I2C_delay();
    I2C_delay();
    if(SDA_read)
    {
        SCL_L;
        return 0;
    }
    SCL_L;
    return 1;
}

void I2C_SendByte(u8 SendByte) //数据从高位到低位//
{
    u8 i=8;
    SDA_out;        
    while(i--)
    {
        SCL_L;
        I2C_delay();
        if(SendByte&0x80)
            SDA_H;  
        else 
            SDA_L;   
        SendByte<<=1;
        I2C_delay();
        SCL_H;
        I2C_delay();
        I2C_delay();
    }
    SCL_L;
}  

u8 I2C_ReadByte(void)  //数据从高位到低位//
{ 
    u8 i=8;
    u8 ReceiveByte=0;

    SDA_H;                
    SDA_out;        
    while(i--)
    {
        ReceiveByte<<=1;      
        SCL_L;
        I2C_delay();
        I2C_delay();
        SCL_H;
        SDA_in;        
        I2C_delay();    
        I2C_delay();
        if(SDA_read)
        {
            ReceiveByte|=0x01;
        }
    }
    SCL_L;
    return ReceiveByte;
} 

//7bit地址单字节写入*******************************************
int I2C_7bit_Single_Write(u8 SlaveAddress, u8 REG_data)        
{
    if(!I2C_Start())return 0;
    I2C_SendByte(SlaveAddress);   //发送设备地址+写信号//I2C_SendByte(((REG_Address & 0x0700) >>7) | SlaveAddress & 0xFFFE);//设置高起始地址+器件地址 
    if(!I2C_WaitAck()){I2C_Stop(); return 0;}
    I2C_SendByte(REG_data);
    I2C_WaitAck();   
    I2C_Stop(); 
    return 1;
}

//7bit地址单字节读取*****************************************
u8 I2C_7bit_Single_Read(u8 SlaveAddress)
{   
    unsigned char REG_data;         
    if(!I2C_Start())return 0;
    I2C_SendByte(SlaveAddress); //I2C_SendByte(((REG_Address & 0x0700) >>7) | REG_Address & 0xFFFE);//设置高起始地址+器件地址 
    if(!I2C_WaitAck())
    {
        I2C_Stop();
        return 0;
    }
    I2C_Start();
    I2C_SendByte(SlaveAddress+1);
    I2C_WaitAck();

    REG_data= I2C_ReadByte();
    I2C_NoAck();
    I2C_Stop();
    //return TRUE;
    return REG_data;

}    

//7bit地址多字节读取*****************************************
int I2C_7bit_Mult_Read(u8 SlaveAddress,u8 * ptChar,u8 size)
{
    u8 i;
    
    if(size < 1)
        return 0;
    if(!I2C_Start())
        return 0;
    I2C_SendByte(SlaveAddress);
    if(!I2C_WaitAck())
    {
        I2C_Stop();
        return 0;
    }
    I2C_Start();
    I2C_SendByte(SlaveAddress+1);
    I2C_WaitAck();
    
    for(i=1;i<size; i++)
    {
        *ptChar++ = I2C_ReadByte();
        I2C_Ack();
    }
    *ptChar++ = I2C_ReadByte();
    I2C_NoAck();
    I2C_Stop();
    return 1;    
}    



//10bit地址单字节写入*******************************************
int I2C_10bit_Single_Write(u8 SlaveAddress,u8 REG_Address,u8 REG_data)        
{
    if(!I2C_Start())return 0;
    I2C_SendByte(SlaveAddress);   //发送设备地址+写信号//I2C_SendByte(((REG_Address & 0x0700) >>7) | SlaveAddress & 0xFFFE);//设置高起始地址+器件地址 
    if(!I2C_WaitAck()){I2C_Stop(); return 0;}
    I2C_SendByte(REG_Address );   //设置低起始地址      
    I2C_WaitAck();    
    I2C_SendByte(REG_data);
    I2C_WaitAck();   
    I2C_Stop(); 
    return 1;
}

//10bit地址单字节读取*****************************************
u8 I2C_10bit_Single_Read(u8 SlaveAddress,u8 REG_Address)
{   
    unsigned char REG_data;         
    if(!I2C_Start())return 0;
    I2C_SendByte(SlaveAddress); //I2C_SendByte(((REG_Address & 0x0700) >>7) | REG_Address & 0xFFFE);//设置高起始地址+器件地址 
    if(!I2C_WaitAck())
    {
        I2C_Stop();
        return 0;
    }
    I2C_SendByte((u8) REG_Address);   //设置低起始地址      
    I2C_WaitAck();
    I2C_Start();
    I2C_SendByte(SlaveAddress+1);
    I2C_WaitAck();

    REG_data= I2C_ReadByte();
    I2C_NoAck();
    I2C_Stop();
    //return TRUE;
    return REG_data;

}    

//10bit地址多字节读取*****************************************
int I2C_10bit_Mult_Read(u8 SlaveAddress,u8 REG_Address,u8 * ptChar,u8 size)
{
    u8 i;
    
    if(size < 1)
        return 0;
    if(!I2C_Start())
        return 0;
    I2C_SendByte(SlaveAddress);
    if(!I2C_WaitAck())
    {
        I2C_Stop();
        return 0;
    }
    I2C_SendByte(REG_Address);    
    I2C_WaitAck();
    
    I2C_Start();
    I2C_SendByte(SlaveAddress+1);
    I2C_WaitAck();
    
    for(i=1;i<size; i++)
    {
        *ptChar++ = I2C_ReadByte();
        I2C_Ack();
    }
    *ptChar++ = I2C_ReadByte();
    I2C_NoAck();
    I2C_Stop();
    return 1;    
}