Getting Junk data on I2C LCD 16x2 display while interfacing with stm32f401re Micro controller . please help

Interfaced i2c_lcd with stm32f401re and try to program without any library .but getting junk data always,tried changing delay but same.

 void I2C_WriteData(uint32_t data)

{

uint8_t data1=0,data2=0,data3=0,data4=0; 

  data1= data & 0x000000ff;

  data2= (data & 0x0000ff00)>>8;

  data3= (data & 0x00ff0000)>>16;

  data4= (data & 0xff000000)>>24;

  uart_printf("The data1 is %x :\n",data1);

  uart_printf("The data2 is %x :\n",data2);

  uart_printf("The data3 is %x :\n",data3);

  uart_printf("The data4 is %x :\n\n\n",data4);

  delay(100);

  while(!(I2C1->SR1 & (1<<7))) ;/* Wait for Bit 7 TxE: Data register empty */

  I2C1->DR=data1;

  while(!(I2C1->SR1 & (1<<2)));/*Wait for the byte Tranfer */

  while(!(I2C1->SR2 & (1<<1)));/**Wait for busy flag*/

  delay(10);

  while(!(I2C1->SR1 & (1<<7))) ;/* Wait for Bit 7 TxE: Data register empty */

  I2C1->DR=data2;

  while(!(I2C1->SR1 & (1<<2)));/*Wait for the byte Tranfer */

  while(!(I2C1->SR2 & (1<<1)));/**Wait for busy flag */

  delay(10);

  while(!(I2C1->SR1 & (1<<7))) ;/* Wait for Bit 7 TxE: Data register empty */

  I2C1->DR=data3;

  while(!(I2C1->SR1 & (1<<2)));/*Wait for the byte Tranfer */

  while(!(I2C1->SR2 & (1<<1)));/**Wait for busy flag*/

  delay(10);

  while(!(I2C1->SR1 & (1<<7))) ;/* Wait for Bit 7 TxE: Data register empty */

  I2C1->DR=data4;

  while(!(I2C1->SR1 & (1<<2)));/*Wait for the byte Tranfer */

  while(!(I2C1->SR2 & (1<<1))) ;/**Wait for busy flag */

  delay(10);

}

 Code is attached below