关于STM32F302C8 定时器1居中对齐模式中断的问题

就这么淋雨走

最近要做用STM32F302C8 做一个正弦脉宽调制程序，将定时器1设置为PWM输出居中对齐模式时，发现每个载波周期会进两次更新中断，中断频率是PWM频率的两倍。中断点如图中红圈的位置。
我只需要进去位置1的更新中断。位置2的中断需要被屏蔽掉。看数据手册也没找到具体原因，是否有人遇到过类似的问题？为嘛 居中对齐模式一个周期会产生两次中断？

ps:定时器1配置为边缘对齐的时候中断频率和PWM频率是一致的。




[mw_shl_code=c,true]static void timer_init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;
// TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
  
  /* GPIOA and GPIOB clocks enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOC, ENABLE);

  /* TIM1 clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  /* GPIO Configuration: Channel 1, 2, 1N, 2N, 3  and 3N as alternate function push-pull */

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10;        
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14| GPIO_Pin_15;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  

  /* Connect TIM pins to AF */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource6,         GPIO_AF_6);
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource8,         GPIO_AF_6);        //-->CH1
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource9,         GPIO_AF_6);        //-->CH2
//  GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_6); //-->CH3
  
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_6); //CH1N
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_6);        //CH2N
//  GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_6);


  /* Enable the TIM1 Trigger and commutation interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_TIM16_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);   


  /* Time Base configuration */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;
  TIM_TimeBaseStructure.TIM_Period = TIM_PRID;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  /* Channel 1, 2 and 3 Configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  
  TIM_OCInitStructure.TIM_Pulse = TIM_PRID/2;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);

  TIM_OCInitStructure.TIM_Pulse = TIM_PRID/2;
  TIM_OC2Init(TIM1, &TIM_OCInitStructure);

//  TIM_OCInitStructure.TIM_Pulse = TIM_PRID/2;
//  TIM_OC3Init(TIM1, &TIM_OCInitStructure);

  /* Automatic Output enable, Break, dead time and lock configuration*/
//  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
//  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
//  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
//  TIM_BDTRInitStructure.TIM_DeadTime = 10;
//  TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
//  TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
//  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
//  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
  
        TIM1->BDTR|=1<<15;                        //MOE: &Ouml;÷&Ecirc;&auml;&sup3;&ouml;&Ecirc;&sup1;&Auml;&Uuml; (Main output enable)
        TIM1->BDTR&=~(0XFF<<0);
        TIM1->BDTR|=0X40<<0;                //UTG[7:0]: &Euml;&Agrave;&Ccedil;&oslash;·&cent;&Eacute;ú&AElig;÷&Eacute;è&Ouml;&Atilde; (Dead-time generator setup)


  TIM_CCPreloadControl(TIM1, ENABLE);

//  TIM_ITConfig(TIM1, TIM_IT_COM, ENABLE);

  TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);//&Ocirc;&Ecirc;&ETH;í&cedil;ü&ETH;&Acirc;&Ouml;&ETH;&para;&Iuml;
                 
  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);

  /* Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
  
}[/mw_shl_code]

就这么淋雨走

图片刚没发上去，现在补上

2016-06-22
刚看到数据手册，中心对齐模式 定时器 上溢和下溢都会触发更新中断，好像不能单独屏蔽上溢或者下溢中断。
所以现在改为中心对齐模式，CCR1的比较中断，这样中断频率和PWM频率 就对上了。

貌似论坛里面 做 电源 和 电机驱动的人不多。。。。。。

自问自答。。。。。

刨不平

可以的，修改重复计数器的值为 1，每两次溢出，触发一次更新