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📄 i2c.c

📁 i2c驱动
💻 C
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#pragma SFR
#pragma NOP

#include "i2c.h"

void   I2C_Start(void);
void   I2C_Wait(void); 
void   I2C_Stop(void);  
uchar  I2C_SendByte(uchar byte);
uchar  I2C_ReceiveByte(void); 
uchar  I2C_Read(uchar slvaddr,uchar address,uchar length,uchar *databuf);
uchar  I2C_Write(uchar slvaddr,uchar address,uchar length,uchar *databuf);
void   SendAcknowledge(uchar ack);
void   LCDI2C_Start(void);
void   LCDI2C_Stop(void);  
uchar  LCDI2C_SendByte(uchar byte);
extern  void  Delay(uint n);

void  I2C_Start(void)
{
    SDAMODE=0;
    I2C_Wait();
    SDA=1;
    I2C_Wait();
    SCL=1;
    I2C_Wait();
    SDA=0;
    I2C_Wait();
    SCL=0;	
}

void  I2C_Stop(void)
{
    SDAMODE=0;
    I2C_Wait();
    SDA=0;
    I2C_Wait();
    SCL=1;
    I2C_Wait();
    SDA=1;	
}

void  I2C_Wait(void)
{
    NOP();NOP();NOP();NOP();NOP();NOP();NOP();NOP();NOP();                              			 
}

uchar  I2C_SendByte(uchar byte)
{
    uchar i,ack;
    SDAMODE=0;
    I2C_Wait();
    for (i=0;i<=7;i++)
    {
        if(byte&0x80)
        {
          SDA=1;
        }
        else
        {
          SDA=0;
        }
        byte<<=1;
        SCL=1;
        I2C_Wait();
        SCL=0;
        I2C_Wait();
    }
    SDA=1;
    SDAMODE=1;							 
    I2C_Wait();
    SCL=1;
    I2C_Wait();   
    if(SDA==1) 
    {
    	ack=0;	
    }					 
    else 
    {
    	ack=1;
    }
    SCL=0;
    SDAMODE=0;
    return(ack);	
}

uchar  I2C_ReceiveByte(void)
{
    uchar i,byte=0;
    SDAMODE=1;
    I2C_Wait();
    for(i=0;i<=7;i++)
    {       
       SCL=1;
       I2C_Wait(); 
       byte<<=1;      
       if(SDA==1)
       {
       	 byte|=0x01;
       }
       SCL=0;
    }
    return(byte);	
}

void  SendAcknowledge(uchar ack)
{
    SDAMODE=0;
    I2C_Wait();
    if(ack)
    {
       SDA=1;
    }	
    else
    {
       SDA=0;
    }
    I2C_Wait();
    SCL=1;
    I2C_Wait();
    SCL=0;
}

uchar  I2C_Read(uchar slvaddr,uchar address,uchar length,uchar *databuf)
{
    uchar i,j,ack;   
    for(j=0;j<3;j++)							 
    {
    	 I2C_Start();	
       ack=I2C_SendByte(slvaddr);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();
       ack=I2C_SendByte(address);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();    
       
       ack=I2C_SendByte(slvaddr|0x01);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       NOP();
       for(i=0;i<length;i++)
       {
         *(databuf+i)=I2C_ReceiveByte();
         if(i<length-1)
         {
   	        SendAcknowledge(0);
   	     }
         else
         {
   	        SendAcknowledge(1);	
   	     }
       }
       I2C_Stop();
       if(ack==1)
   	   {  
   	  	   break;
   	   } 
   	}
    return(ack);
}

uchar  I2C_Write(uchar slvaddr,uchar address,uchar length,uchar *databuf)
{
    uchar i,j,ack;
    for(j=0;j<3;j++)							 
    {
   	  I2C_Start();	
   	  ack=I2C_SendByte(slvaddr);
   	  if(ack==0)
   	  {
      	 	I2C_Stop();continue;	
   	  }
   	  I2C_Wait();
   	  ack=I2C_SendByte(address);
     	if(ack==0)
   	  {
       		I2C_Stop();continue;
     	}    	    	
   	  for(i=0;i<length;i++)
   	  {
      		ack=I2C_SendByte(*(databuf+i));
      		if(ack==0) 
      		{
      			break;
      		}
   	  }
   	  if(ack==0)
   	  {
       		I2C_Stop();continue;
   	  }
     	I2C_Stop();
   	  if(ack==1)  
   	  {
   	  	  break;
   	  }
    }
    return(ack);						
}

uchar Read_24LC64(uint address,uchar length,uchar *databuf)
{
    uchar i,j,ack;  
    for(j=0;j<3;j++)							 
    { 
    	 I2C_Start();
       ack=I2C_SendByte(EEPADR);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();
       ack=I2C_SendByte((uchar)(address>>8));
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();
       ack=I2C_SendByte((uchar)(address&0x00FF));
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();    
       
       ack=I2C_SendByte(EEPADR|0x01);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       NOP();
       for(i=0;i<length;i++)
       {
         *(databuf+i)=I2C_ReceiveByte();
         if(i<length-1)
         {
   	       SendAcknowledge(0);
   	    }
         else
         {
   	       SendAcknowledge(1);	
   	    }
       }
       I2C_Stop();
       if(ack==1)
   	   {  
   	  	   break;
   	   }
   	}
    return(ack);
}


uchar  Write_24LC64(uint address,uchar length,uchar *databuf)
{
    uchar i,j,ack;
    WP=0;
    for(j=0;j<3;j++)							 
    {
   	  I2C_Start();	
   	  ack=I2C_SendByte(EEPADR);
   	  if(ack==0)
   	  {
      	 	I2C_Stop();continue;	
   	  }
   	  I2C_Wait();
   	  ack=I2C_SendByte((uchar)(address>>8));
     	if(ack==0)
   	  {
       		I2C_Stop();continue;
     	}
   	  I2C_Wait();
   	  ack=I2C_SendByte((uchar)(address&0x00FF));
     	if(ack==0)
   	  {
       		I2C_Stop();continue;
     	}
     	I2C_Wait();
     	    	
   	  for(i=0;i<length;i++)
   	  {
      		ack=I2C_SendByte(*(databuf+i));
      		if(ack==0) 
      		{
      			break;
      		}
   	  }
   	  if(ack==0)
   	  {
       		I2C_Stop();continue;
   	  }
     	I2C_Stop();
   	  if(ack==1)  
   	  {
   	  	  break;
   	  }
    }
    Delay(5);
    WP=1;    
    return(ack);								 
}

uchar Read_24LC64_Check(uint address,uchar length,uchar *databuf)
{
    uchar i,j,ack;  
    uchar checksum;
    uchar tempchar;    
    for(j=0;j<3;j++)							 
    { 
    	 checksum=0;
    	 I2C_Start();
       ack=I2C_SendByte(EEPADR);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();
       ack=I2C_SendByte((uchar)(address>>8));
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();
       ack=I2C_SendByte((uchar)(address&0x00FF));
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       I2C_Wait();    
       
       ack=I2C_SendByte(EEPADR|0x01);
       if(ack==0)
       {
          I2C_Stop();
          continue;	
       }
       NOP();
       for(i=0;i<length;i++)
       {
          *(databuf+i)=I2C_ReceiveByte();
          checksum+=(*(databuf+i));                               
          SendAcknowledge(0);
       }
       tempchar=I2C_ReceiveByte();                            
       SendAcknowledge(1);
       I2C_Stop();
 	     if(checksum!=tempchar)                             
 	     { 	         
 	         ack=0;
 	     }       
       if(ack==1)
   	   {  
   	  	   break;
   	   }
   	}
    return(ack);
}

uchar  Write_24LC64_Check(uint address,uchar length,uchar *databuf)
{
    uchar i,j,ack;
    uchar checksum;
    WP=0;
    for(j=0;j<3;j++)							 
    {
     	 checksum=0;
   	   I2C_Start();	
   	   ack=I2C_SendByte(EEPADR);
   	   if(ack==0)
   	   {
      	 	I2C_Stop();continue;	
   	   }
   	   I2C_Wait();
   	   ack=I2C_SendByte((uchar)(address>>8));
     	 if(ack==0)
   	   {
       		I2C_Stop();continue;
     	 }
   	   I2C_Wait();
   	   ack=I2C_SendByte((uchar)(address&0x00FF));
     	 if(ack==0)
   	   {
       		I2C_Stop();continue;
      	}
      	I2C_Wait();
     	    	
   	   for(i=0;i<length;i++)
   	   {
      		ack=I2C_SendByte(*(databuf+i));
      		if(ack==0) 
      		{
      			break;
      		}
      		checksum+=(*(databuf+i));
   	   }
   	   ack=I2C_SendByte(checksum);
   	   if(ack==0)
   	   {
       		I2C_Stop();continue;
   	   }
     	 I2C_Stop();
   	   if(ack==1)  
   	   {
   	  	  break;
   	   }
    }
    Delay(5);
    WP=1;
    return(ack);								 
}
/***********************************************************************/
void  RX8025_Init(void)
{
   uchar  rx8025_buf[2];
   rx8025_buf[0]=RX8025_CTRLBYTE1;
   rx8025_buf[1]=RX8025_CTRLBYTE2;
   RX8025_Write(0xe0,2,&rx8025_buf[0]);		
}
uchar  RX8025_Read(uchar address,uchar length,uchar *databuf)
{
   uchar addr;
   addr=address<<4;
   if (I2C_Read(RX8025ADR,address,length,databuf))
   {
   	  return(1);
   }
   return(0);
}
uchar  RX8025_Write(uchar address,uchar length,uchar *databuf)
{
   uchar addr;
   addr=address<<4;
   if( I2C_Write(RX8025ADR,address,length,databuf) )
   {
   	  return(1);
   }
   return(0);
}
/***********************************************************************/
void  LCDI2C_Start(void)
{
    SDA1MODE=0;
    I2C_Wait();
    SDA1=1;
    I2C_Wait();
    SCL1=1;
    I2C_Wait();
    SDA1=0;
    I2C_Wait();
    SCL1=0;	
}

void  LCDI2C_Stop(void)
{
    SDA1MODE=0;
    I2C_Wait();
    SDA1=0;
    I2C_Wait();
    SCL1=1;
    I2C_Wait();
    SDA1=1;	
}

uchar  LCDI2C_SendByte(uchar byte)
{
    uchar i,ack;
    SDA1MODE=0;
    I2C_Wait();
    for (i=0;i<=7;i++)
    {
        if(byte&0x80)
        {
          SDA1=1;
        }
        else
        {
          SDA1=0;
        }
        byte<<=1;
        SCL1=1;
        I2C_Wait();
        SCL1=0;
        I2C_Wait();
    }
    SDA1=1;
    SDA1MODE=1;							 
    I2C_Wait();
    SCL1=1;
    I2C_Wait();   
    if(SDA1==1) 
    {
    	ack=0;	
    }					 
    else 
    {
    	ack=1;
    }
    SCL1=0;
    SDA1MODE=0;
    return(ack);	
}

void  BU9792_Init(void)
{
    LCDI2C_Start();
    LCDI2C_SendByte(BU9792ADR);
    I2C_Wait();
    LCDI2C_SendByte(BU9792_ICSET|0x80);					 
    I2C_Wait();
    LCDI2C_SendByte(BU9792_DISCTL|0x80);					 
    I2C_Wait(); 
    LCDI2C_SendByte(BU9792_BLKCTL|0x80);					 
    I2C_Wait();    
    LCDI2C_SendByte(BU9792_APCTL|0x80);					 
    I2C_Wait();
    LCDI2C_SendByte(BU9792_MODESET);					 
    I2C_Wait();           	
    LCDI2C_Stop();	
}

void  BU9792_DisplayAll(uchar byte)					
{
    uchar  test_num;
    LCDI2C_Start();
    LCDI2C_SendByte(BU9792ADR);
    I2C_Wait();
    LCDI2C_SendByte(0x00);
    I2C_Wait();
    test_num=16;
    while(test_num--)
    {
       LCDI2C_SendByte(byte); 
    }
    LCDI2C_Stop();
}

void  BU9792_Display(uchar address,uchar length,uchar *databuf)
{
    uchar i,ack;
    LCDI2C_Start();
    LCDI2C_SendByte(BU9792ADR);
    I2C_Wait();
    LCDI2C_SendByte(address);
    I2C_Wait();
    for(i=0;i<length;i++)
    { 
       LCDI2C_SendByte(*(databuf+i));
    }
    I2C_Wait();
    LCDI2C_Stop();	
}

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