i2c problem

[David.Cheng]

here is the read 16 bytes register code

uint16_t TMP_ReadConfReg(void)
{
  __IO uint16_t RegValue = 0;
 
  /* Enable LM75_I2C acknowledgement if it is already disabled by other function */
  I2C_AcknowledgeConfig(LM75_I2C, ENABLE);
  /*----------------------------- Transmission Phase --------------------------*/
  /* Send LM75_I2C START condition */
  I2C_GenerateSTART(LM75_I2C, ENABLE);
 
  /* Test on LM75_I2C EV5 and clear it */
  while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_MODE_SELECT))  /* EV5 */
  {
  }
 
  /* Send STLM75 slave address for write */
  I2C_Send7bitAddress(LM75_I2C, LM75_ADDR, I2C_Direction_Transmitter);
 
  /* Test on LM75_I2C EV6 and clear it */
  while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) /* EV6 */
  {
  }
 
  /* Send the configuration register data pointer */
  I2C_SendData(LM75_I2C, LM75_REG_CONF);
 
  /* Test on LM75_I2C EV8 and clear it */
  while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) /* EV8 */
  {
  }
 
  /*----------------------------- Reception Phase -----------------------------*/
  /* Send Re-STRAT condition */
  I2C_GenerateSTART(LM75_I2C, ENABLE);
 
  /* Test on EV5 and clear it */
  while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_MODE_SELECT))  /* EV5 */
  {
  }
 
  /* Send STLM75 slave address for read */
  I2C_Send7bitAddress(LM75_I2C, LM75_ADDR, I2C_Direction_Receiver);
 
  /* Test on EV6 and clear it */
  while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))  /* EV6 */
  {
  }
  
  //while (I2C_GetFlagStatus(LM75_I2C, I2C_FLAG_RXNE) == RESET);
  while (!I2C_CheckEvent(LM75_I2C, I2C_EVENT_MASTER_BYTE_RECEIVED))  /* EV7 */
  {
  }
  /* Store LM75_I2C received data */
  RegValue = I2C_ReceiveData(LM75_I2C) << 8;
 
  /* Disable LM75_I2C acknowledgement */
  I2C_AcknowledgeConfig(LM75_I2C, DISABLE);
 
  /* Send LM75_I2C STOP Condition */
  I2C_GenerateSTOP(LM75_I2C, ENABLE);
 
  /* Test on RXNE flag */
  while (I2C_GetFlagStatus(LM75_I2C, I2C_FLAG_RXNE) == RESET);
  
 
  /* Store LM75_I2C received data */
  RegValue |= I2C_ReceiveData(LM75_I2C);
 
  /* Return configuration register value */
  return (RegValue);
}

if i call TMP_ReadConfReg first , then code frozen , loop at while (I2C_GetFlagStatus(LM75_I2C, I2C_FLAG_RXNE) == RESET);

if i write configure register first , then TMP_ReadConfReg return ok