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