I2C read issue

Hi,

We are using stm32f446zet for a new project . We want to read 3 bytes of data using i2c and the read function is as follows . The 1st two bytes are read correctly but the 3rd byte is always zero . Please help us to solve these issues

int I2C3_ReadShort (char Adr) 

{

 I2C3->CR1 |= (I2C_CR1_START);      // send START bit

 while (!(I2C3->SR1 & I2C_SR1_SB)) {};  // wait for START condition (SB=1)

 I2C3->DR = SLAVE_ADDRESS_WRITE;     // slave address -> DR (LSB=1)

 while (!(I2C3->SR1 & I2C_SR1_ADDR)) {}; // wait for ADDRESS sent (ADDR=1)

 int Status2 = I2C3->SR2;         // read SR2 to clear flag

 I2C3->DR = Adr;             // register in chip -> DR

 while (!(I2C3->SR1 & I2C_SR1_TXE)) {};  // wait for DR empty (TxE=1)

 while (!(I2C3->SR1 & I2C_SR1_BTF)) {};  // wait for ByteTransferred (BTF=1)

 I2C3->CR1 |=(I2C_CR1_START);       // send START bit

 while (!(I2C3->SR1 & I2C_SR1_SB)) {};  // wait for START condition (SB=1)

 I2C3->DR = SLAVE_ADDRESS_READ;      // slave address -> DR (LSB=0)

 while (!(I2C3->SR1 & I2C_SR1_ADDR)) {}; // wait for ADDRESS sent (ADDR=1)

 I2C3->CR1 |= I2C_CR1_ACK;

 int Status4 = I2C3->SR2;         // read status to clear flag

 while (!(I2C3->SR1 & I2C_SR1_BTF)) {};  // wait for ByteReceived (BTF=1)

 I2C3->CR1 &= ~I2C_CR1_ACK;

 int x1 = I2C3->DR;           // safe place

 while (!(I2C3->SR1 & I2C_SR1_BTF)) {};  // wait for ByteReceived (BTF=1)

 I2C3->CR1 |= (I2C_CR1_STOP);       // send STOP bit 

 int x2 = I2C3->DR << 8;        // safe place

 int x3 = I2C3->DR << 16;        // safe place

 return ((int)(x1 + x2 + x3));     // return combined bytes

}