/**
* \brief Internal ADC init
* \param None
* \retval None
*/
void ADCint_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;


//pins init pins: IN0(PA0), IN9(PB1) : input< ADC
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_3 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* ADC1 DeInit */
ADC_DeInit(ADC1);

/* Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&AdcIntRawArray[0];
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = ADCINT_BUFF_SIZE;
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 = ADC_DMAMode_OneShot;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1,&DMA_InitStructure);
/* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1,ADC_DMAMode_Circular);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStructure);
/* Configure the ADC1 in continous mode with a resolutuion equal to 12 bits */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1,&ADC_InitStructure);

ADC_ClockModeConfig(ADC1, ADC_ClockMode_SynClkDiv4);

// channels selection and it's sampling time config
ADC_ChannelConfig(ADC1, ADC_Channel_0, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_3, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_5, ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor, ADC_SampleTime_55_5Cycles);
ADC_TempSensorCmd(ENABLE);
ADC_ChannelConfig(ADC1,ADC_Channel_Vrefint,ADC_SampleTime_55_5Cycles);
ADC_VrefintCmd(ENABLE);

/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);

/* Enable ADC1 */
ADC_Cmd(ADC1,ENABLE);
while(!ADC_GetFlagStatus(ADC1,ADC_FLAG_ADEN));/* Wait the ADCEN falg */

//interrupt
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE); // Enable DMA1 Channel Transfer Complete interrupt
DMA_Cmd(DMA1_Channel1, ENABLE); //Enable the DMA1 - Channel1
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; //Enable DMA1 channel IRQ Channel */
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);


/* ADC1 regular Software Start Conv */
ADC_DMACmd(ADC1,ENABLE);
DMA_Cmd(DMA1_Channel1,ENABLE);
ADC_StartOfConversion(ADC1);
}

extern volatile xSemaphoreHandle Semaphore_ADCint_Done; /*!< it is set in interrupt when new reading is done */


void DMA1_Channel1_IRQHandler(void)
{
DMA_ClearITPendingBit( DMA1_IT_TC1);
// this is ADC_DMAMode_OneShot mode, so everething has stopped till next start
xSemaphoreGiveFromISR (Semaphore_ADCint_Done, NULL); //FreeRTOS support: the ADCinternal_Task will be activated
}