STM32F10x - SPI doesn't send any data

this is the program. this program build successfully but on simulation(SPI WINDOW SPI1_DR) it does not show any data please suggest....

#include "stm32f10x_lib.h"
#define BufferSize 10
void RCC_Configuration(void);
void GPIO_Configuration(void);
void SPI_Configuration(void);
ErrorStatus HSEStartUpStatus;
u8 TxIdx = 0, RxIdx = 0;
u8 SPI1_Buffer_Tx[BufferSize] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09};

u8 SPI1_Buffer_Rx[BufferSize];
int main(void)
{
    RCC_Configuration();
    GPIO_Configuration();
    /* Just delay some time */
    SPI_Configuration();
    /* Enable SPI1 */
    SPI_Cmd(SPI1, ENABLE);

        while(TxIdx < BufferSize)
        {

               SPI_I2S_SendData(SPI1, SPI1_Buffer_Tx[TxIdx]);
                TxIdx++;

        }
 }
void RCC_Configuration(void)
{

        RCC_DeInit();
        RCC_HSEConfig(RCC_HSE_ON);
        HSEStartUpStatus=RCC_WaitForHSEStartUp();
        if(HSEStartUpStatus == SUCCESS)
        {
                 RCC_HCLKConfig(RCC_SYSCLK_Div1);
                 RCC_PCLK2Config(RCC_HCLK_Div2);
                 RCC_PCLK1Config(RCC_HCLK_Div2);
                 RCC_PCLK1Config(RCC_HCLK_Div2);
                 RCC_PLLConfig(0x00010000, RCC_PLLMul_9);
                 RCC_PLLCmd(ENABLE);
                 while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {}
                 RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
                 while (RCC_GetSYSCLKSource() != 0x08) {}
        }
        /* Enable peripheral clocks ----------------------------------------------*/
    /* GPIOA and SPI1 clock enable */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |  RCC_APB2Periph_SPI1, ENABLE);

}
void GPIO_Configuration(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
        GPIO_DeInit(GPIOA);
        /* Configure SPI1 pins: SCK, MISO and MOSI -------------------------------*/
    GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

}
void SPI_Configuration(void)
{
        SPI_InitTypeDef SPI_InitStructure;
        SPI_I2S_DeInit(SPI1);
        /* Initialize the SPI_Direction member */
 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

  /* initialize the SPI_Mode member */
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

  /* initialize the SPI_DataSize member */
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;

  /* Initialize the SPI_CPOL member */
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

  /* Initialize the SPI_CPHA member */
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

  /* Initialize the SPI_NSS member */
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

  /* Initialize the SPI_BaudRatePrescaler member */
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;

  /* Initialize the SPI_FirstBit member */
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;

  /* Initialize the SPI_CRCPolynomial member */
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

}