void Init_Sound(void)
{
DAC_InitTypeDef DAC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM6, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseStructure.TIM_Period = 72-1; //
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);

TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

DMA_DeInit(DMA2_Channel3);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&DAC->DHR8R1;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32) &WAVBuffer[0];
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize =512;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA2_Channel3, &DMA_InitStructure);

DMA_Cmd(DMA2_Channel3, ENABLE);

DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = 0;
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);

DAC_Cmd(DAC_Channel_1, ENABLE);

DAC_DMACmd(DAC_Channel_1, ENABLE);

TIM_Cmd(TIM6, DISABLE);
}

if(Kn_a==1)    // Kn_a находится в прерывании
{
   Init_Sound();
   load_header();   // Здесь читаются заголовки WAV и настраивается таймер
   sound();
   Kn_a=0;
}

void sound(void)
{
   while(1)
      {
         TIM_Cmd(TIM6, ENABLE);
      while(!(DMA2->ISR & DMA_ISR_HTIF3)) {}  

     f_read (&fsrc, &WAVBuffer[0], 256, &rb);
       DAC_SetChannel1Data(DAC_Align_8b_R, WAVBuffer[0]);
  

     if(rb < 256) {TIM_Cmd(TIM6, DISABLE); break;}  

     while(!(DMA2->ISR & DMA_ISR_TCIF3)) {}

     f_read (&fsrc, &WAVBuffer[256], 256, &rb);
       DAC_SetChannel1Data(DAC_Align_8b_R, WAVBuffer[256]);

     if(rb < 256) {TIM_Cmd(TIM6, DISABLE); break;}
       }
}