void ADC_Setup(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef  ADC_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;

    // Enable GPIOA clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    // PA0 - ch0, PA1 - cha1, PA2 - cha2 ... PA7 - ch7
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //TIMER 3
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV4;
    TIM_TimeBaseStructure.TIM_Period = 1000 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 48000 - 1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
    TIM_SelectOutputTrigger (TIM3, TIM_TRGOSource_Update);
    TIM_ARRPreloadConfig(TIM3, ENABLE);

    // DMA1 channel1 configuration ----------------------------------------------
    DMA_DeInit(DMA1_Channel1);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADCConvertedValues;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = 2;
    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_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    DMA_Cmd(DMA1_Channel1, ENABLE);                 // Enable DMA1 Channel1

    /* ADC1 configuration ------------------------------------------------------*/
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    //ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 2;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);

    ADC_DMACmd(ADC1, ENABLE);                   //enable DMA for ADC

    ADC_ExternalTrigConvCmd(ADC1, ENABLE);
    //ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);       // Enable ADC End Of Conversion interrupt


    ADC_Cmd(ADC1, ENABLE);                      // Enable ADC1
    ADC_ResetCalibration(ADC1);                 // Enable ADC1 reset calibaration register
    while(ADC_GetResetCalibrationStatus(ADC1)); // Check the end of ADC1 reset calibration register
    ADC_StartCalibration(ADC1);                 // Start ADC1 calibaration
    while(ADC_GetCalibrationStatus(ADC1));      // Check the end of ADC1 calibration

    //ADC_SoftwareStartConvCmd(ADC1, ENABLE);   // Start ADC1 Software Conversion

    TIM_Cmd(TIM3, ENABLE);

    NVIC_InitTypeDef NVIC_InitStructure;
    //Enable DMA1 channel IRQ Channel
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    DMA_ITConfig(DMA1_Channel1,DMA1_IT_TC1,ENABLE); // DMA Transfer Complete interrupt Enable
}

void DMA1_Channel1_IRQHandler(void)
{
    /* Test on DMA Stream Transfer Complete interrupt */
    if(DMA_GetITStatus(DMA1_IT_TC1))
    {
        /* Clear DMA Stream Transfer Complete interrupt pending bit */
        DMA_ClearITPendingBit(DMA1_IT_TC1);

        voltage = (ADCConvertedValues[0] *3300)/0xFFF;
        current = (ADCConvertedValues[1] *3300)/0xFFF;

        watthours_f += voltage/(float)1000 * current/(float)1000 * (1/(float)3600);
    }
}