[STM8] 硬件I2C的问题（新人求教）

void I2C_Touch_ReadData(u8* pBuffer,bool HLRAddr,u8 ReadAddr,u8 NumByteToRead)

{  

    /* While the bus is busy */

  while(I2C_GetFlagStatus(I2C_FLAG_BUSBUSY));

  

  /* Generate start & wait event detection */

    I2C_GenerateSTART(ENABLE);

  /* Test on EV5 and clear it */

  while (!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT));

  

  /* Send Hight Or Low address*/

  if(HLRAddr)

  {  

    I2C_Send7bitAddress(VDD_ADDRESS, I2C_DIRECTION_TX);

  }

  else

  {

    I2C_Send7bitAddress(GND_ADDRESS, I2C_DIRECTION_TX);

  }

   /* Test on EV6 and clear it */

    while (!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));

    I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);

    

   /* Send Address of first byte to be read & wait event detection */

    //I2C_SendData((u8)(ReadAddr >> 8)); /* MSB */

    /* Test on EV8 and clear it */

    //while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    I2C_SendData((u8)(ReadAddr)); /* LSB */

   /* Test on EV8 and clear it */

    while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  

   /* Send STRAT condition a second time */  

   I2C_GenerateSTART(ENABLE);

    /* Test on EV5 and clear it */

   while (!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT));

  

  /* Send Hight Or Low address*/



  if(HLRAddr)

  {  

    I2C_Send7bitAddress(VDD_R_ADDRESS, I2C_DIRECTION_RX);

  }

  else

  {

    I2C_Send7bitAddress(GND_R_ADDRESS, I2C_DIRECTION_RX);

  }



   /* Test on EV6 and clear it */

    while (!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));

    I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);

  

  /* While there is data to be read */

  while(NumByteToRead)  

  {

    if(NumByteToRead == 1)

    {

      /* Disable Acknowledgement */

      I2C_AcknowledgeConfig(I2C_ACK_NONE);

      

      /* Send STOP Condition */

      I2C_GenerateSTOP(ENABLE);

    }



    /* Test on EV7 and clear it */

    if(I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED))  

    {      

      /* Read a byte from the EEPROM */

      *pBuffer = I2C_ReceiveData();



      /* Point to the next location where the byte read will be saved */

      pBuffer++; 

      

      /* Decrement the read bytes counter */

      NumByteToRead--;        

    }   

  }



  /* Enable Acknowledgement to be ready for another reception */

  //I2C_AcknowledgeConfig(I2C_ACK_CURR);

  I2C_CR2 |= MASK_I2C_CR2_ACK;

}