i2c.h

PHILIPS FQ1286高频头c51驱动程序

//i2c driver

#define x2402dev   0xa0
#define CHECK_I2C_TIME  0x32

sbit I2C_SCL  = P1^7;
sbit I2C_ACK  = P1^6;
sbit I2C_SDA  = P1^6;

unsigned char i2c_data;

void delay5us()
{
// unsigned char i;
// for(i=0;i<1;i++)
//  {}
   _nop_();
   _nop_();
   _nop_();

}

void delay100us()
{unsigned char i;
// EA=0;
// for(i=0;i<30;i++)
// for(i=0;i<10;i++)
 for(i=0;i<9;i++)
  {}
}

void delay30ms()
{unsigned int i;
 EA=0;
 for(i=0;i<330;i++)
 delay100us();
 EA=1;
}

i2c_delay()
{
//	unsigned char j;
//      for(j=0;j<5;j++)
        delay5us();
}

void i2c_init()
{

 I2C_SDA  =  1;//0;   //SDA = 1
 I2C_SCL  =  1;//0    //SCL = 1
 delay30ms();
}

void i2c_startcode(void)
{
	I2C_SDA  = 1;//0;		// SDA = 1
	I2C_SCL = 1;//0;		// SCL = 1

	i2c_delay();

	I2C_SDA = 0;//1;		// SDA = 0
	i2c_delay();

}

void i2c_stopcode()
{
	I2C_SDA = 0;//1;		// SDA = 0
	i2c_delay();

	I2C_SCL = 1;//0;		// SCL = 1
	i2c_delay();
	I2C_SDA = 1;//0;		// SDA = 1
	i2c_delay();
}

unsigned char i2c_check_ack()
{
    unsigned char i,j;
	
	I2C_SCL = 0;//1;   //SCL = 0
	I2C_SDA  = 1;//0;   //SDA = 1
	i2c_delay();

	I2C_SCL = 1;//0;   //SCL = 1
	
	for(i=0;i<CHECK_I2C_TIME;i++)
	for(j=0;j<5;j++)
	{
	    i2c_delay();
//        if(I2C_ACK!=0) //SDA ==1
        if(I2C_ACK!=1) //SDA ==1
		{
		    I2C_SCL = 0;//1;  //SCL = 0       
	        i2c_delay();
			return  1;
        }
	}

	 return 0;
}

void send_Unack()
{
    unsigned char  i,j;

	I2C_SCL = 0;//1;    //SCL = 0
	I2C_SDA = 1;//0;     //SDA = 1
	i2c_delay();
	I2C_SCL = 1;//0;    //SCL = 1
	
	i2c_delay();
	I2C_SCL =0;//1 ;	 // SCL = 0
}

char i2c_read(unsigned char dev_addr,unsigned char sub_addr)
{
    unsigned char i;
    unsigned char datacode;
     
    EA=0; 
	
    //STARTCODE
    i2c_startcode();
    
	//send dev addr
	datacode = dev_addr;
    for(i=0;i<8;i++)
	{ 
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;  //SDA = 1  
      else    
	    I2C_SDA = 0;//1;  //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;  //SCL = 1
      i2c_delay();
      datacode<<=1;
	}

	//receive ack
	//error return 
	if(i2c_check_ack()==0)
    {
        i2c_stopcode(); 
		EA =1;
		return 0;
	}
  
    //write sub_addr
    datacode = sub_addr;
    i2c_delay();
    for(i=0;i<8;i++)
	{ 
	  I2C_SCL  = 0;//1;   //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;   //SDA = 1 
      else    
	    I2C_SDA = 0;//1;   //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;   //SCL = 1
      i2c_delay();
      datacode<<=1;
	}

   //receive ack
   //error return 
   if(i2c_check_ack()==0)
   {	  
       i2c_stopcode();
	   EA = 1;
	   return 0;
   }
  
   //START 
   i2c_startcode();
   //send dev_addr for read data
   datacode = dev_addr|0x01;
   i2c_delay();
   for(i=0;i<8;i++)
   { 
	  I2C_SCL  = 0;//1;    //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;    //SDA = 1 
      else    
	    I2C_SDA = 0;//1;    //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;    //SCL = 1
      i2c_delay();
      datacode<<=1;
   }

   //receive ack
   //error return 
   if(i2c_check_ack()==0)
   {
       i2c_stopcode();  
       EA =1;
	   return 0;
   }

   //read data from I2C bus
   i2c_delay();
   datacode = 0;
   for(i=0;i<8;i++)
	{ 
	  datacode = datacode <<1;
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
      I2C_SCL  = 1;//0;  //SCL = 1	  
      i2c_delay();
//	  if(I2C_ACK == 0) //ACK ==1
	  if(I2C_ACK == 1) //ACK ==1
		  datacode = datacode | 0x01;	
	}

   i2c_data = datacode;

   // send no_ack
   send_Unack();
   //STOP
   i2c_stopcode();

 EA = 1; 
 return 1;
}

char i2c_read_without_subaddr(unsigned char dev_addr)
{
    unsigned char i;
    unsigned char datacode;
     
    EA=0; 
	
  
   //START 
   i2c_startcode();
   //send dev_addr for read data
   datacode = dev_addr|0x01;
   i2c_delay();
   for(i=0;i<8;i++)
   { 
	  I2C_SCL  = 0;//1;    //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;    //SDA = 1 
      else    
	    I2C_SDA = 0;//1;    //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;    //SCL = 1
      i2c_delay();
      datacode<<=1;
   }

   //receive ack
   //error return 
   if(i2c_check_ack()==0)
   {
       i2c_stopcode();  
       EA =1;
	   return 0;
   }

   //read data from I2C bus
   i2c_delay();
   datacode = 0;
   for(i=0;i<8;i++)
	{ 
	  datacode = datacode <<1;
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
      I2C_SCL  = 1;//0;  //SCL = 1	  
      i2c_delay();
//	  if(I2C_ACK == 0) //ACK ==1
	  if(I2C_ACK == 1) //ACK ==1
		  datacode = datacode | 0x01;	
	}

   i2c_data = datacode;

   // send no_ack
   send_Unack();
   //STOP
   i2c_stopcode();

 EA = 1; 
 return 1;
}


char i2c_write(unsigned char dev_addr,unsigned char sub_addr)
{
    unsigned char i;
    unsigned char datacode;
     
    EA=0; 
	
    //START
    i2c_startcode();

    //send dev addr
	datacode = dev_addr;
    for(i=0;i<8;i++)
	{ 
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;   //SDA = 1 
      else    
	    I2C_SDA = 0;//1;   //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;   //SCL = 1
      i2c_delay();
      datacode<<=1;
	}

    //receive ack
	//error return 
	if(i2c_check_ack()==0)
    {
        i2c_stopcode();
		EA =1;
		return 0;
	}
  
    //write sub_addr
    datacode = sub_addr;
    i2c_delay();
    for(i=0;i<8;i++)
	{ 
	  I2C_SCL  = 0;//1; //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;    //SDA = 1
      else    
	    I2C_SDA = 0;//1;    //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;    //SCL = 1
      i2c_delay();
      datacode<<=1;
	}

   //receive ack
   //error return 
   if(i2c_check_ack()==0)
   {	  
       i2c_stopcode();
	   EA =1;
	   return 0;
   }
     
   //send  data  
   datacode = i2c_data;
   i2c_delay();
   for(i=0;i<8;i++)
   { 
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;    //SDA = 1
      else    
	    I2C_SDA = 0;//1;    //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;    //SCL = 1
      i2c_delay();
      datacode<<=1;
   }

   //receive ack
   //error return 
   if(i2c_check_ack()==0)
   {
      i2c_stopcode();
	  EA =1;
      return 0;
   }

 //STOP 
 i2c_stopcode(); 
 EA = 1; 
 return 1;
}


char i2c_write_without_subaddr(unsigned char dev_addr)
{
    unsigned char i;
    unsigned char datacode;
     
    EA=0; 
	
    //START
    i2c_startcode();

    //send dev addr
	datacode = dev_addr;
    for(i=0;i<8;i++)
	{ 
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;   //SDA = 1 
      else    
	    I2C_SDA = 0;//1;   //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;   //SCL = 1
      i2c_delay();
      datacode<<=1;
	}

    //receive ack
	//error return 
	if(i2c_check_ack()==0)
    {
        i2c_stopcode();
		EA =1;
		return 0;
	}
  
     
   //send  data  
   datacode = i2c_data;
   i2c_delay();
   for(i=0;i<8;i++)
   { 
	  I2C_SCL  = 0;//1;  //SCL = 0
      i2c_delay();
	  if(datacode&0x80)	
	    I2C_SDA = 1;//0;    //SDA = 1
      else    
	    I2C_SDA = 0;//1;    //SDA = 0
      i2c_delay();
	  I2C_SCL  = 1;//0;    //SCL = 1
      i2c_delay();
      datacode<<=1;
   }

   //receive ack
   //error return 
   if(i2c_check_ack()==0)
   {
      i2c_stopcode();
	  EA =1;
      return 0;
   }

 //STOP 
 i2c_stopcode(); 
 EA = 1; 
 return 1;
}