STM8 中I2C读写函数。

void I2C_write(u8 Addr, u8 *WriteData, u8 length)
{
  /* Send STRAT condition */
  I2C_GenerateSTART(ENABLE);
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT)); 
  /* Send EEPROM address for write */
  I2C_Send7bitAddress(Addr, I2C_DIRECTION_TX);  
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));
   I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);// must add   
  for(int i = 0; i<length; i++)
  {
    I2C_SendData(WriteData[i]); 
    /* Test on EV8 and clear it */
    while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTING));    
  }  
  /* Send STOP condition */
  I2C_GenerateSTOP(ENABLE);  
}

void I2C_Read(u8* pBuffer, u8 ReadAddr, u8 NumByteToRead)
{    
 while(I2C->SR3&0x02);
 I2C->CR2 |= 0x01;
 while(!(I2C->SR1 & 0x01));
 I2C->DR = ReadAddr;
 while(!(I2C->SR1 & 0x02)); 
 I2C->SR1; 
 I2C->SR3;
 while(NumByteToRead)  
{
  if(NumByteToRead == 1) 
    {
      I2C->CR2 &= ~0x04; 
      I2C->CR2 |= 0x02; 
    }  
    if(I2C->SR1 & 0x40)
    {   
      *pBuffer=I2C->DR;
       pBuffer++;  
       NumByteToRead--;        
    }      
  }   
  I2C->CR2 |= 0x04;
}