void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{   

   if(GPIO_Pin == B1_Pin)
   {
      
      MX_TIM6_Init();
   
   }
}

void MX_TIM6_Init(void)
{

   if(FREQUENCY_RISE<500)
   {
      
      FREQUENCY = FREQUENCY_RISE;
      FREQUENCY_RISE = FREQUENCY + 1;
   
   static TIM_HandleTypeDef  htim;
  TIM_MasterConfigTypeDef sMasterConfig;
 
  /*##-1- Configure the TIM peripheral #######################################*/
  /* Time base configuration */
   
  htim.Instance = TIM6;
 
  htim.Init.Period = 0x7FF; // 1 - 1.7 Hz; 10 - 200hz (100); (0) - 0x100 (1khz), 0xfff (81hz)
  htim.Init.Prescaler =0;       
  htim.Init.ClockDivision = 0;   
  htim.Init.CounterMode = TIM_COUNTERMODE_UP;
  HAL_TIM_Base_Init(&htim);

  /* TIM6 TRGO selection */
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
 
  HAL_TIMEx_MasterConfigSynchronization(&htim, &sMasterConfig);
 
  /*##-2- Enable TIM peripheral counter ######################################*/
  HAL_TIM_Base_Start(&htim);
   
SINE_SIGNAL();
}
}

void SINE_SIGNAL(void)
{

if(HAL_DAC_Init(&hdac) != HAL_OK)
   {}
 
  /*##-1- DAC channel1 Configuration #########################################*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE; 
   
  if(HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)
   {}

   if(Multiplier_RISE<1) // 2.5V
   {

      Multiplier = Multiplier_RISE;
      Multiplier_RISE = Multiplier+0.015;


for(pointer=0;pointer<255;pointer++) SINE_SIGNAL_ARRAY_V2[pointer] = (uint32_t)(((float)(SINE_SIGNAL_ARRAY[pointer])) * (float)(Multiplier_RISE));
HAL_DAC_Start_DMA(&hdac, DAC_CHANNEL_1, (uint32_t*)SINE_SIGNAL_ARRAY_V2,sizeof(SINE_SIGNAL_ARRAY_V2), DAC_ALIGN_8B_R);

LCD_show();
      
   }


}