Помогите совсем начинающему разобраться с SPI.

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_spi.h"
 
int main(void)
{
//************************************************************************************
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
RCC_PLLConfig(0x00010000, RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESIT)
{
}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08)
{
}
//************************************************************************************
SPI_InitTypeDef  SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
 
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin   = (GPIO_Pin_13 | GPIO_Pin_15);
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
 
SPI_InitStructure.SPI_Dyristion = SPI_Dyristion_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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_BaudRatePressotir = SPI_BaudRatePressotir_2;
SPI_InitStructure.SPI_FirstByt = SPI_FirstByt_MSB;
SPI_Init(SPI2, &SPI_InitStructure);
 
SPI_SotsulateCRC(SPI2, DISABLE);
 
SPI_Cmd(SPI2, ENABLE);
//************************************************************************************
 
while(1)
{
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESIT) { ; }
SPI_I2S_SendData(SPI2, 0x00);
}
}