使用STM32F407 TIM_DMA方式，驱动WS2812B。参考正点原子灯板的代码。但是只要我开启DMA（        //DMA_ClearITPendingBit(DMA2_Stream6, DMA_IT_TCIF6);
        //DMA_ITConfig(DMA2_Stream6, DMA_IT_TC, ENABLE);开启这两句）中断，板子就死机了。代码如下：
u16 MyTestDmaBuf0[24] = {67,142,67,142,67,142,67,142,67,142,67,142,67,142,67,142,67,142,67,142,67,142,67,142};

//u16 MyTestDmaBuf0[24] = {70,34,70,34,70,34,70,34,70,34,70,34,70,34,70,34,70,34,70,34,70,34,70,34};
//u16 MyTestDmaBuf0[24] = {105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104};

u16 MyTestDmaBuf1[24] = {105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104,105,104};

#if 1
void GTLM_Fun_Time1_Ch3_Pwm_DMA(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
        GPIO_InitTypeDef GPIO_InitStructure;
        DMA_InitTypeDef DMA_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);        //使能PORTB时钟
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);        //使能TIM2时钟
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);        //使能DMA时钟
       
       
        //初始化灯环RGB灯
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 ;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
        GPIO_Init(GPIOE, &GPIO_InitStructure);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource12, GPIO_AF_TIM1);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource13, GPIO_AF_TIM1);

        NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream6_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
       
        DMA_DeInit(DMA2_Stream6);
        DMA_InitStructure.DMA_Channel = DMA_Channel_6;       
        DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&TIM1->CCR3) ;
        DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)MyTestDmaBuf0;
        DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
        DMA_InitStructure.DMA_BufferSize = 24;
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
        DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
        DMA_InitStructure.DMA_Priority = DMA_Priority_High;
        DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
        DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
        DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
        DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
        DMA_Init(DMA2_Stream6, &DMA_InitStructure);
        DMA_DoubleBufferModeCmd(DMA2_Stream6, ENABLE);//使能双缓冲
        DMA_DoubleBufferModeConfig(DMA2_Stream6, (u32)MyTestDmaBuf1, DMA_Memory_0);

       /***********************************************问题**************************************************/
       /*************************开启下面两条语句，程序就不能启动，调试可以发现就挂在这个函数里面。********************/
        //DMA_ClearITPendingBit(DMA2_Stream6, DMA_IT_TCIF6);
        //DMA_ITConfig(DMA2_Stream6, DMA_IT_TC, ENABLE);
       

        /* Time Base configuration */
        TIM_TimeBaseStructure.TIM_Prescaler = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_Period = 209;
        //TIM_TimeBaseStructure.TIM_Period = 104;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

        TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);



        /* Channel 3 Configuration in PWM mode */
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
        //TIM_OCInitStructure.TIM_Pulse = MyTestDmaBuf0[0];
        TIM_OCInitStructure.TIM_Pulse = 0;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
        TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
        TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
        TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

        TIM_OC3Init(TIM1, &TIM_OCInitStructure);

        /* Enable preload feature */
        TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

        /* TIM1 counter enable */
        TIM_Cmd(TIM1, ENABLE);

        /* DMA enable*/
        DMA_Cmd(DMA2_Stream6, ENABLE);

        /* TIM1 Update DMA Request enable */
        TIM_DMACmd(TIM1, TIM_DMA_CC3, ENABLE);


       

        /* Main Output Enable */
        TIM_CtrlPWMOutputs(TIM1, ENABLE);
        //TIM1->BDTR |= TIM_BDTR_MOE;

        //printf("1111111111 ");

       

        //printf("2222222222222 ");
        //DMA_ITConfig(DMA2_Stream6, DMA_IT_TC, ENABLE);
        //DMA_ClearITPendingBit(DMA2_Stream6, DMA_IT_TCIF6);
       

        //printf("33333333333 ");

       
}
#endif