main.c

IO口模拟I2C 读写操作

#include "C8051F340.h"
#include <intrins.h>
#define SomeNop()    _nop_();_nop_();_nop_();_nop_();_nop_();
sbit SCL=P0^1;
sbit SDA=P0^0;
sbit RST=P0^6;
/////////////////////////////////////
//  Generated Initialization File  //
/////////////////////////////////////
// Peripheral specific initialization functions,
// Called from the Init_Device() function
void PCA_Init()
{
    PCA0MD    &= ~0x40;
    PCA0MD    = 0x00;	 //禁止看门狗
}

void Port_IO_Init()
{
    // P0.0  -  Skipped,     Open-Drain, Digital
    // P0.1  -  Skipped,     Open-Drain, Digital
    // P0.2  -  Unassigned,  Open-Drain, Digital
    // P0.3  -  Unassigned,  Open-Drain, Digital
    // P0.4  -  Unassigned,  Open-Drain, Digital
    // P0.5  -  Unassigned,  Open-Drain, Digital
    // P0.6  -  Unassigned,  Push-Pull,  Digital
    // P0.7  -  Unassigned,  Open-Drain, Digital

    // P1.0  -  Unassigned,  Open-Drain, Digital
    // P1.1  -  Unassigned,  Open-Drain, Digital
    // P1.2  -  Unassigned,  Open-Drain, Digital
    // P1.3  -  Unassigned,  Open-Drain, Digital
    // P1.4  -  Unassigned,  Open-Drain, Digital
    // P1.5  -  Unassigned,  Open-Drain, Digital
    // P1.6  -  Unassigned,  Open-Drain, Digital
    // P1.7  -  Unassigned,  Open-Drain, Digital

    // P2.0  -  Unassigned,  Open-Drain, Digital
    // P2.1  -  Unassigned,  Open-Drain, Digital
    // P2.2  -  Unassigned,  Open-Drain, Digital
    // P2.3  -  Unassigned,  Open-Drain, Digital
    // P2.4  -  Unassigned,  Open-Drain, Digital
    // P2.5  -  Unassigned,  Open-Drain, Digital
    // P2.6  -  Unassigned,  Open-Drain, Digital
    // P2.7  -  Unassigned,  Open-Drain, Digital

    // P3.0  -  Unassigned,  Open-Drain, Digital
    // P3.1  -  Unassigned,  Open-Drain, Digital
    // P3.2  -  Unassigned,  Open-Drain, Digital
    // P3.3  -  Unassigned,  Open-Drain, Digital
    // P3.4  -  Unassigned,  Open-Drain, Digital
    // P3.5  -  Unassigned,  Open-Drain, Digital
    // P3.6  -  Unassigned,  Open-Drain, Digital
    // P3.7  -  Unassigned,  Open-Drain, Digital
    P0MDOUT   = 0x40;   
    P0SKIP    = 0x03;
    XBR1      = 0x40;
}

void Oscillator_Init()
{
    OSCICN    = 0x83;	 //系统时钟12MHz；
}

// Initialization function for device,
// Call Init_Device() from your main program
void Init_Device(void)
{
    PCA_Init();
    Port_IO_Init();
    Oscillator_Init();
}
//----------------------------------------------------------------------------
void Delay(unsigned int x)
{
    unsigned int i, j;
    
    for (i=0; i<x; i++)
    {
        for (j=0; j<0xff; j++)
        {;}
    }
}
//----------------------------------------------------------------------------
void Init_TTQH6(void)
{
    RST=0;
	Delay(1);
	RST=1;
	Delay(20);
    
}

void I2C_Delay(void)
{
   	
// SomeNop();
_nop_();//_nop_();//_nop_();_nop_();// 1uS ,>0.6uS

}

//----------------------------------------------------------------------------
/*
**start
**    ________      
**SCL         \______
**    ____         
**SDA     \__________
**
*/
void I2C_Start(void)
{
    SCL = 0;
    I2C_Delay();
    I2C_Delay();
    SDA = 1;
    I2C_Delay();
    SCL = 1;
    I2C_Delay();
    SDA = 0;
    I2C_Delay();
    SCL = 0;
    I2C_Delay();  //jm add
}
//----------------------------------------------------------------------------
/*
**stop
**          _______
**SCL  ____/       -------
**             ____
**SDA  _______/    ----
**
*/
void I2C_Stop(void)
{
    SCL = 0;
    I2C_Delay();
    SDA = 0;
    I2C_Delay();
    SCL = 1;
    I2C_Delay();
    while(SCL != 1) SCL = 1;
    SDA = 1;
    I2C_Delay();
}
//----------------------------------------------------------------------------
void I2C_Write_Byte(unsigned char w_dat)
{
    unsigned char i;
    
    for (i=0; i<8; i++)
    {
        SDA = (bit)(w_dat & 0x80);
        I2C_Delay();
        SCL = 1;
        w_dat <<= 1;
        I2C_Delay();
        SCL = 0;
    	I2C_Delay();  //jm add


    }
    SDA = 1;	   //释放SDA数据线	
    I2C_Delay();

}
//----------------------------------------------------------------------------
unsigned char I2C_Read_Ack(void)
{	
     SCL = 1;
   do
    {
         SDA = 1;

    }while (SDA != 0);
	
	
    SCL = 0;
    I2C_Delay(); //jm add
    return(0);
}
//----------------------------------------------------------------------------
unsigned char I2C_Read_Byte(void)
{
    unsigned char i, r_dat;
    
    SDA = 1;
    SCL = 1;
    while(SCL != 1)
    {				  //释放
        SCL = 1;
    }

    for (i=0; i<8; i++)
    {
        SCL = 1;
        I2C_Delay();
        r_dat <<= 1;
        r_dat |= (char)SDA;
        SCL = 0;
        I2C_Delay();  //jm add
        I2C_Delay(); //jm add
    }
    SDA = 1;		//释放
    I2C_Delay();
    SCL = 1;
    I2C_Delay();
    SCL = 0;
    return(r_dat);
}
//----------------------------------------------------------------------------
//---------------------------------------------------------------------------

unsigned char Read_TTQH6(unsigned char device_ID,unsigned char register_address)
{
    unsigned char dat;
    
  //  I2C_Stop();	//jm delete
    I2C_Start();
    I2C_Write_Byte(device_ID);             // 器件写地址
    I2C_Read_Ack();
    I2C_Write_Byte(register_address); // 寄存器地址
    I2C_Read_Ack();	
					 
    I2C_Stop();				      //
    I2C_Start();				//

    I2C_Write_Byte(device_ID+1);             //器件读地址
    I2C_Read_Ack();
    dat = I2C_Read_Byte();
    //I2C_Write_Ack();                //数据已从TTQH6中读出不用再理会回传应答
    I2C_Stop();

    return(dat);
}
//----------------------------------------------------------------------------
void Write_TTQH6(unsigned char device_ID,unsigned char register_address,unsigned char value)
{
   
   // I2C_Stop();	 //jm delete
    I2C_Start();
    I2C_Write_Byte(device_ID);              // 器件写地址
    I2C_Read_Ack();
    I2C_Write_Byte(register_address);  // 寄存器地址
    I2C_Read_Ack();
    I2C_Write_Byte(value);             // 写数据
    I2C_Read_Ack();
    I2C_Stop();
	SomeNop(); 
	SomeNop(); 
	SomeNop();
	SomeNop();											
	 
}
//------------------------------------------------------------------------
 void main(void)
{
unsigned char Rdata1,Rdata2;
	Init_Device();						   
	Init_TTQH6();											


// Write_TTQH6(0xC4,0x00,0x10);
//while(1)
//{

  Rdata1=Read_TTQH6(0xC4,0x00);

//}

// Rdata2=Read_TTQH6(0xC4,0x00);
// while(1);


}