STM32F 3 phase digital signals

snippet from timer.c:
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TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
__IO uint16_t CCR1_Val = 65534;
__IO uint16_t CCR2_Val = 43689;
__IO uint16_t CCR3_Val = 21844;
uint16_t PrescalerValue = 0;

/* Private function prototypes -----------------------------------------------*/
void Setup3PhaseTimer(void);
void NVICConfig(void);
/* Private functions ---------------------------------------------------------*/





void Setup3PhaseTimer(void)
{

    NVICConfig();

    /* Turn on LED4, LED3, LED5 and LED6 */
    STM32F4_Discovery_LEDOn(LED4);
    STM32F4_Discovery_LEDOn(LED3);
    STM32F4_Discovery_LEDOn(LED5);

    PrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 250000) - 1;

    /* Time base configuration */
    TIM_TimeBaseStructure.TIM_Period = 65534;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    /* Prescaler configuration */
    TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate);

    /* Output Compare Timing Mode configuration: Channel1 */
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC1Init(TIM3, &TIM_OCInitStructure);

    TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);

    /* Output Compare Timing Mode configuration: Channel2 */
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

    TIM_OC2Init(TIM3, &TIM_OCInitStructure);

    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);

    /* Output Compare Timing Mode configuration: Channel3 */
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

    TIM_OC3Init(TIM3, &TIM_OCInitStructure);

    TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);

    /* TIM Interrupts enable */
    TIM_ITConfig(TIM3, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3, ENABLE);

    /* TIM3 enable counter */
    TIM_Cmd(TIM3, ENABLE);
}


void NVICConfig(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    /* TIM3 clock enable */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    /* Enable the TIM3 gloabal Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}
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snippet from stm32f4xx_it.c:
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void TIM3_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)
  {
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC1);
    STM32F4_Discovery_LEDToggle(LED4);
  }
  else if (TIM_GetITStatus(TIM3, TIM_IT_CC2) != RESET)
  {
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);

    STM32F4_Discovery_LEDToggle(LED3);
  }
  else if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)
  {
    TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);
    STM32F4_Discovery_LEDToggle(LED5);
  }
}
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