stm32f030 pwm中间对齐模式

void TIM_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* 使能GPIO时钟 */
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB,ENABLE);
    
  /* 配置GPIO管脚复用*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_7 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;                // 复用功能
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;            //推挽输出模式
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;                //上拉
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_0 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;                // 复用功能
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;            //推挽输出模式
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;                //上拉
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    
    //PA10-PB1 PA9-PB0 PA8-PA7
  //GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_0);        //CLOCK OUTPUT
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_2);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_2);
    
    GPIO_PinAFConfig(GPIOB,GPIO_PinSource0,GPIO_AF_2);
    GPIO_PinAFConfig(GPIOB,GPIO_PinSource1,GPIO_AF_2);
    //RCC->CFGR |= RCC_CFGR_MCO_HSE;
    //RCC_MCOConfig(0x06);     //mco output HSE

}

void TIM_PWM_Config(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
  TimerPeriod = ((SystemCoreClock / 17570 ) - 1)/2;

  /* TIM1 时钟使能 */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
  
  /* Time 定时基础设置*/
  TIM_TimeBaseStructure.TIM_Prescaler = 0;                //预分频器参数
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;  /* Time 定时设置为上升沿计算模式*/
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;        //周期
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;            //时钟分频     
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;    //计数周期

  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
    
    TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
    TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
    TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
    TIM_BDTRInitStructure.TIM_DeadTime = 75;                    //死区时间
    TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
    TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
    TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
    TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
    
    //TIM_SelectOutputTrigger(TIM1,TIM_TRGOSource_OC1Ref);
    
     TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
     
     NVIC_InitStructure.NVIC_IRQChannel = TIM1_BRK_UP_TRG_COM_IRQn;
     NVIC_InitStructure.NVIC_IRQChannelPriority = 3;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);
    
        TIM_CtrlPWMOutputs(TIM1, ENABLE);
        TIM_Cmd(TIM1, ENABLE);

        
    }

void TIM1_BRK_UP_TRG_COM_IRQHandler(void)
{
    //led_trans();
    if((TIM1->CNT & 0xff00) != 0)
    {
        //LED_Close();
        //LED_Open();
        LED_Close();
        
        ADC_StartOfConversion(ADC1);
        while(ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC)==RESET); 
        LED_Open();    
        adc_data=ADC_GetConversionValue(ADC1);
    }
    else
    {
        pwmclg = 1;
    }
    TIM_ClearITPendingBit(TIM1,TIM_IT_Update);
}