Timer 32 Mhz oder 72 Mhz ?

  // enable TIMER TIM2 system clock

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

 /* Enable the Timer2 Interrupt */

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);

  NVIC_InitStructure->NVIC_IRQChannel = TIM2_IRQn;             //  configure the Timer2 interrupts

  NVIC_InitStructure->NVIC_IRQChannelPreemptionPriority = 3;   //  sets the priority group of the TIMER2 interrupts

  NVIC_InitStructure->NVIC_IRQChannelSubPriority = 0;           //  set the subpriority inside the group

  NVIC_InitStructure->NVIC_IRQChannelCmd = ENABLE;             //  TIMER2 interrupts are globally enabled

  NVIC_Init(NVIC_InitStructure);    

  /* Configure Timer which is every 1  ms active*/

  TIM_DeInit(TIM2);

  TIM_TimeBaseStructInit(TIM_TimeBaseStructure);

  /* Time base configuration */

  TIM_TimeBaseStructure->TIM_Prescaler = 360 - 1; // 72 MHz / 360 = 200 khz

  TIM_TimeBaseStructure->TIM_Period = 200 - 1;    // (1/200khz) * 200 = 1 ms;

  TIM_TimeBaseStructure->TIM_ClockDivision = TIM_CKD_DIV1;

  TIM_TimeBaseStructure->TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, TIM_TimeBaseStructure);

  //TIM_PrescalerConfig(TIM2, 360-1 , TIM_PSCReloadMode_Immediate);

  /* Enable TIM2 Update Interrupt */

  TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

  /* Enable TIM2 */

  TIM_Cmd(TIM2,ENABLE);