STM32F ADC with DMA on CMSIS

void DMA2_Stream4_IRQHandler(void)
{
        GPIOD->ODR        ^=((1<<12)|(1<<13)|(1<<14)|(1<<15));
}
uint16_t BUFF[100];int main(void)
{
    SystemInit();
//*********************GPIO*************************
        RCC->AHB1ENR    |= RCC_AHB1ENR_GPIOAEN;
        RCC->AHB1ENR    |= RCC_AHB1ENR_GPIODEN;
        GPIOA->MODER    |= GPIO_MODER_MODER6;        //ADC1 CH6 PA6


//*********************TIM3*************************
        RCC->APB1ENR    |= RCC_APB1ENR_TIM3EN;        // тактирование таймера
        TIM3->PSC         = 160-1;                    // предделитель
        TIM3->ARR         = 1000-1;                    // переполнение
        TIM3->CR2         |= TIM_CR2_MMS_1;            // output (TRGO)
        TIM3->DIER         |= TIM_DIER_UDE;
        TIM3->CR1         |= TIM_CR1_CEN;                //запуск счета


//********************DMA***************************
        RCC->AHB1ENR    |= RCC_AHB1ENR_DMA2EN;
        DMA2_Stream4->CR&=~ DMA_SxCR_CHSEL;            // 000: channel 0 selected
        DMA2_Stream4->PAR= (uint32_t)&ADC1->DR;     //
        DMA2_Stream4->M0AR=(uint32_t)&BUFF[0];        // Массив
        DMA2_Stream4->NDTR=100;                        // Длина буфера
        DMA2_Stream4->CR|= DMA_SxCR_MINC;            // Инкремент адреса
        DMA2_Stream4->CR|= DMA_SxCR_MSIZE_0;        // 16 бит
        DMA2_Stream4->CR|= DMA_SxCR_PSIZE_0;        // 16 бит
        DMA2_Stream4->CR|= DMA_SxCR_CIRC;            // Непрерывный режим
        DMA2_Stream4->CR&=~ DMA_SxCR_DIR;            // 01: peripheral-to-Memory
        DMA2_Stream4->CR|= DMA_SxCR_PL;                // 11: Very high приоритет
        DMA2_Stream4->CR|= DMA_SxCR_TCIE;            // Transfer complete interrupt enable
        DMA2_Stream4->CR|= DMA_SxCR_EN;                 // Вкл. передачу
        NVIC_EnableIRQ(DMA2_Stream4_IRQn);
        NVIC_SetPriority(DMA2_Stream4_IRQn,5);

//********************ADC1**CH6 PA6***************
        RCC->APB2ENR    |= RCC_APB2ENR_ADC1EN;
        ADC1->CR1         |=ADC_CR1_SCAN;                // Scan mode
        ADC1->CR2        |=(ADC_CR2_EXTSEL_3);        //tim 3 (TRGO)
        ADC1->SQR3        =6;                            //выбор канала PA6
        ADC1->CR2         |=ADC_CR2_DMA;                //разрешаем рабуту DMA
        ADC1->CR2         |=ADC_CR2_DDS;                //DMA disable selection (for single ADC mode)
        ADC1->CR2        &=~ADC_CR2_CONT;            //Continuous conversion
        ADC1->CR2        |=ADC_CR2_EXTEN_0;            //01: Trigger detection on the rising edge
        ADC1->CR2        |= ADC_CR2_EOCS;            //разрешаем прерывания
        ADC1->CR2         |=ADC_CR2_ADON;                //Вкл. переобразования