DMA_DeInit(DMA1_Stream5);
    DMA_INIT.DMA_Channel            = DMA_Channel_7;
    DMA_INIT.DMA_PeripheralBaseAddr = (uint32_t)&DAC->DHR12L1;//->DHR12R1;// &DAC->DHR12L1; DHR8R1;
    DMA_INIT.DMA_Memory0BaseAddr    = (uint32_t)&dac_buff;
    DMA_INIT.DMA_DIR                = DMA_DIR_MemoryToPeripheral;
    DMA_INIT.DMA_BufferSize         = 512;
    DMA_INIT.DMA_PeripheralInc      = DMA_PeripheralInc_Disable;
    DMA_INIT.DMA_MemoryInc          = DMA_MemoryInc_Enable;
    DMA_INIT.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_INIT.DMA_MemoryDataSize     = DMA_MemoryDataSize_HalfWord;
    DMA_INIT.DMA_Mode               = DMA_Mode_Circular;
    DMA_INIT.DMA_Priority           = DMA_Priority_High;
    DMA_INIT.DMA_FIFOMode           = DMA_FIFOMode_Disable;
    DMA_INIT.DMA_FIFOThreshold      = DMA_FIFOThreshold_HalfFull;
    DMA_INIT.DMA_MemoryBurst        = DMA_MemoryBurst_Single;
    DMA_INIT.DMA_PeripheralBurst    = DMA_PeripheralBurst_Single;
    DMA_Init(DMA1_Stream5, &DMA_INIT);