Working with STM32F103 and LSM6DSL Sensor. not getting data from LSM6DSL sensor. SPI Communication problem?

[Siva Ram]

STM32F103 SPI Communication with LSM6DSLTR Sensor. not getting data from sensor.

Please go through my code and suggest me if any changes required in program

#include "main.h"
#include "timer.h"
#include "uart.h"
#include "gpio.h"
#include "spi.h"
 
void GPIOB_Init(void){
 
	RCC->APB2ENR	|=	RCC_APB2ENR_IOPBEN;
	RCC->APB2ENR    |=	RCC_APB2ENR_AFIOEN;
	GPIOB->CRH		= 0;
	GPIOB->CRH		|=	(11U<<20); //PB13 (SCK) AF
	GPIOB->CRH		|=	(11U<<28); //PB15 (MOSI) AF 
	GPIOB->CRH		|=	(1<<26); //PB14 (MISO) Input (floating)
	GPIOB->CRH		|= 	(3<<16); //PB12 used for CS, GPIO Output	
	GPIOB->BSRR 	|= GPIO_BSRR_BR12;	
}
void SPI2_Init(void){
 
	RCC->APB1ENR	|=  RCC_APB1ENR_SPI2EN;  // Enable the clock for the SPI2 peripheral
	SPI2->CR1		=	0x0000;
	SPI2->CR2		=	0x0000;
	SPI2->CR1		|=	SPI_CR1_MSTR | SPI_CR1_SSI | SPI_CR1_SSM | SPI_CR1_CPHA | SPI_CR1_CPOL;
	SPI2->CR1		|=	(3<<3); //(SPI_CR1_BR_2 | SPI_CR1_BR_1);
	SPI2->CR1 		&= ~(1<<7);  // LSBFIRST = 0, MSB first
	SPI2->CR1		&= ~(SPI_CR1_RXONLY);
	SPI2->CR1		&= ~(SPI_CR1_DFF);
	SPI2->CR1		|= SPI_CR1_SPE;
}
 
void SPI2_Enable(void){
	SPI2->CR1	|= SPI_CR1_SPE;
}
void SPI2_Disable(void){
	SPI2->CR1	&= ~(SPI_CR1_SPE);
}
void CS_Enable(void){
	GPIOB->BSRR |= GPIO_BSRR_BR12;//1<<(12+16);
}
void CS_Disable(void){
	GPIOB->BSRR |= GPIO_BSRR_BS12; //(1<<12);
}
 
void SPI2_write(uint8_t data)
{
  while(!(SPI2->SR & SPI_SR_TXE));
  SPI2->DR = data;
  while(!(SPI2->SR & SPI_SR_TXE));
  while(!(SPI2->SR & SPI_SR_RXNE));
}
uint8_t SPI2_read(void)
{
  uint8_t data;
  while(!(SPI2->SR & SPI_SR_TXE));  
  while(!(SPI2->SR & SPI_SR_RXNE)){}; 
  data = (uint8_t)SPI2->DR;
  return data;
}
uint8_t LSM6DSLTR_read_reg(uint8_t reg_addr)
{
  SPI2_Enable();
  CS_Enable(); // CS is 0
  SPI2_write(reg_addr | 0x80); 
  data = SPI2_read();
  CS_Disable(); // pull the pin high
  return data;
}
void LSM6DSLTR_Who_Am_I(void){
	uint8_t data;
	data = LSM6DSLTR_read_reg(0x0f);
	Delay_ms(30);
	UART1_TX("\n%x\n", data);
}
 
int main(){;
	USART1_InItAF();
	TIM4Config();
	GPIOB_Init();
	SPI2_Init();
        SPI2_Enable();
	CS_Enable();		
	Delay_ms(500);
	while(1){	
		LSM6DSLTR_Who_Am_I();
		Delay_ms(500);
		}
}

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