I2C打印

#define LOW  0
#define HIGH 1

#define EXBUFF_LEN  100
unsigned char exbuff[EXBUFF_LEN]={0};

#define SDA_SET_AS_INPUT {PE_DDR2=0;}
#define SCL_SET_AS_INPUT {PE_DDR1=0;}

#define test_GET_SDA_VALUE PE_IDR2
#define test_GET_SCL_VALUE PE_IDR1

/*print from I2C Start to I2C End ,then return */
void PrintI2C(void)
{
 unsigned char SDA_last,SDA_current;
 unsigned char SCL_last,SCL_current;

 unsigned char temp,stopState=0;

 unsigned char inbyte=0;
 unsigned int i,j,k;

 static unsigned char ptr=0;

 //PrintString("PrintI2C()...\n") ;
 SDA_SET_AS_INPUT;
 SCL_SET_AS_INPUT;

 while(!test_GET_SDA_VALUE||!test_GET_SCL_VALUE);
 //PrintString("two bus ready\n");
 
 while(1)
 {
  
//wait start
  while(1)
  {

         if(test_GET_SCL_VALUE==HIGH && test_GET_SDA_VALUE==LOW)
        {
             //PrintString("st\n");
             break;
        }
  }

  //printf("wait two line low\n");
  while(test_GET_SDA_VALUE||test_GET_SCL_VALUE);

  while(1)
  {
   for(i=0;i<8;i++)
   { 

//printf("wait scl 1\n");
    while(!test_GET_SCL_VALUE);//wait high
    temp=test_GET_SDA_VALUE;

    if(temp!=0)
    {
     inbyte |= (1<<(7-i));
    }
    //printf("wait scl 0\n");
    while(test_GET_SCL_VALUE)//wait low  
    {
     if(temp==0 && test_GET_SDA_VALUE==1)

{
      //stop
      return;
     }
     else if(temp==1 && test_GET_SDA_VALUE==0)
     {
      //restart
      
     }
    } 
   }

//PrintStringNumberHex(",",inbyte);

#if 1
   exbuff[ptr++]=inbyte;

   if(ptr==EXBUFF_LEN)
   {
    for(j=0;j<EXBUFF_LEN;j++)
    {
     PrintStringNumberHex(",",exbuff[j]);
    }

    while(1);
   }
#endif   

//check ACK or NACK
   while(!test_GET_SCL_VALUE);//wait high
   while(test_GET_SCL_VALUE); //wait low 
   //ack end 

   inbyte=0;
  }
 }
}