SPI1 beim STM32F103

int main(void)

{

#ifdef DEBUG

  debug();

#endif

  /* System Clocks Configuration **********************************************/

  RCC_Configuration();   

  /* NVIC Configuration *******************************************************/

  NVIC_Configuration();

  /* SysTick end of count event each 1ms with input clock equal to 9MHz (HCLK/8, default) */

  SysTick_SetReload(9000);

  /* Enable SysTick interrupt */

  SysTick_ITConfig(ENABLE);

  /* Initial LED PB[8..15] */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIO_LED, ENABLE);

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_InitStructure.GPIO_Pin = LED1_PIN |

                                LED2_PIN |

                                LED3_PIN |

                                LED4_PIN |

                                LED5_PIN |

                                LED6_PIN |

                                LED7_PIN |

                                LED8_PIN;

  GPIO_Init(LED_PORT, &GPIO_InitStructure);  

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  SPI1->CR1 = 0x0B7C;   //Konfigurieren 

  SPI1->CR2 = 0x0063;   //Konfigurieren

  while(1)                          

  {

    GPIOB->ODR = (SPI1->SR & 0x00FF) << 8; //Ausgabe des SR an den LED's

    SPI1->DR = 0xFF00; //Test Daten Schreiben

    SPI1->DR = 0x00FF; //Test Daten Schreiben

  }  

}