stm32f407片内spi读取nrf24l01数据不正确？

以下为我的设置部分代码

//SPI的发送接受函数
  uint8_t SPI_RW_Byte(uint8_t TxData)
 {           
     while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)   ;                
     SPI_I2S_SendData(SPI1, TxData); 
      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)   ;             
      return SPI_I2S_ReceiveData(SPI1); 
  }


//引脚及spi设置函数
static void SPI_Config(void)
{
     GPIO_InitTypeDef GPIO_InitStructure;
//  NVIC_InitTypeDef NVIC_InitStructure;
    SPI_InitTypeDef  SPI_InitStructure;

  /* Peripheral Clock Enable -------------------------------------------------*/
  /* Enable the SPI clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
  
  /* Enable GPIO clocks */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

  /* SPI GPIO Configuration --------------------------------------------------*/
  /* GPIO Deinitialisation */

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;

  /* SPI SCK pin configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_PinSource3;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  
  /* SPI  MISO pin configuration */
  GPIO_InitStructure.GPIO_Pin =  GPIO_PinSource4;
  GPIO_Init(GPIOB, &GPIO_InitStructure);  

  /* SPI  MOSI pin configuration */
  GPIO_InitStructure.GPIO_Pin =  GPIO_PinSource5;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
    
  /* Connect SPI pins to AF5 */  
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_SPI1);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_SPI1);    
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI1); 
    
    GPIO_SetBits(GPIOB,GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5);
  /* SPI  NSS pin configuration */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
    GPIO_InitStructure.GPIO_Pin =  GPIO_PinSource0;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
  /* SPI  CE pin configuration */
    GPIO_InitStructure.GPIO_Pin =  GPIO_PinSource1;
    GPIO_Init(GPIOB, &GPIO_InitStructure);    

  /* SPI configuration -------------------------------------------------------*/
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_Init(SPI1, &SPI_InitStructure);
}
//NRF24L01模块初始化
void NRF24L01_Init()
{
  /* SPI configuration */
    /* SPI master */
  SPI_Config();
    SPI_Cmd(SPI1, ENABLE);
    NRF_CE=0;
    NRF_NSS=1;
}
//write nrf24l01 reg
uint8_t NRF24L01_Write_Reg(uint8_t reg,uint8_t value)
{
    unsigned char status; 
    NRF_NSS = 0; // CSN low, init SPI transaction 
    status = SPI_RW_Byte(reg); // select register 
    SPI_RW_Byte(value); // ..and write value into it.. 
    NRF_NSS = 1; // CSN high again 
    return status;// return nRF24L01 status byte
}

//read reg
uint8_t NRF24L01_Read_Reg(uint8_t reg)
{
    unsigned char reg_val; 
    NRF_NSS = 0; // CSN low, initialize SPI communication...
    SPI_RW_Byte(reg); // Select register to read from.. 
  reg_val = SPI_RW_Byte(NRF_NOP); // ..then read registervalue 
  NRF_NSS = 1; // CSN high, terminate SPI communication 
  return reg_val; // return register value
}

void RX_Mode()
{
    NRF_CE=0; 
//    SPI_WR_Reg(NRF_WRITE_REG + SETUP_AW, 0x03); 
    NRF24L01_Write_Buf(NRF_WRITE_REG + RX_ADDR_P0, myTX_ADDRESS0, NRF_ADR_WIDTH); 
    NRF24L01_Write_Reg(NRF_WRITE_REG + EN_AA, 0x01);     // Enable Auto.Ack:Pipe0 
    NRF24L01_Write_Reg(NRF_WRITE_REG + EN_RXADDR, 0x01); // Enable Pipe0 
    NRF24L01_Write_Reg(NRF_WRITE_REG + RF_CH, 40);       // Select RF channel 40 
    NRF24L01_Write_Reg(NRF_WRITE_REG + RX_PW_P0, NRF_RX_PLOAD_WIDTH); 
    NRF24L01_Write_Reg(NRF_WRITE_REG + RF_SETUP, 0x07); 
    NRF24L01_Write_Reg(NRF_WRITE_REG + CONFIG, 0x0f);
    NRF_CE=1;                                                        
                                                                                        
}

uint8_t NRF24L01_Check(void)
{
    uint8_t buf[5]={0xa5,0xa5,0xa5,0xa5,0xa5};
    uint8_t i;

    NRF24L01_Write_Buf(NRF_WRITE_REG+TX_ADDR,buf,5);
    NRF24L01_Read_Buf(TX_ADDR,buf,5);
    for(i=0;i<5;i++)
        {
            if(buf[i]!=0xa5)
                break;
    }
    if(i!=5)
        return 1;
    return 0;
}

读取数据的代码

i=NRF24L01_Read_Reg(EN_AA);

将NRF设置为接受模式后，读取EN_AA寄存器，正确返回值为1，但实际返回值要么总是变化，要么无论读哪个寄存器返回值都是8。感觉自己没有设置上的错误，但是一直调试不对，求帮助！