ADC STM32F013RE Default is HIGH (4059 )!

[ssabz]

I have written some codes to work with ADC Of STM32F103RE MCU, the problem is there which when I write this codes the result is 4059 for untouched and around 3585 when touched.

The Codes:

 void ADC_DMA_init(void) {
 
   //enable DMA1 clock
 
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
 
   //create DMA structure
 
   DMA_InitTypeDef DMA_InitStructure;
 
   //reset DMA1 channe1 to default values;
 
   DMA_DeInit(DMA1_Channel1);
 
   //channel will be used for memory to memory transfer
 
   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
 
   //setting normal mode (non circular)
 
   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
 
   //medium priority
 
   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
 
   //source and destination data size word=32bit
 
   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
 
   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
 
   //automatic memory destination increment enable.
 
   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
 
   //source address increment disable
 
   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
 
   //Location assigned to peripheral register will be source
 
   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
 
   //chunk of data to be transfered
 
   DMA_InitStructure.DMA_BufferSize = 2;
 
   //source and destination start addresses
 
   DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;;
 
   //adc values is: volatile uint16_t ADC_values[ARRAYSIZE];
 
   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC1ConvertedValue; 
 
   //send values to DMA registers
 
   DMA_Init(DMA1_Channel1, &DMA_InitStructure);
 
   // Enable DMA1 Channel Transfer Complete interrupt
 
   DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
 
   DMA_Cmd(DMA1_Channel1, ENABLE); //Enable the DMA1 - Channel1
 
   }
 
 
   uint16_t Get_ADC_Converted_Value()//int Get_ADC_Converted_Value()
 
   {
 
     ADC_SoftwareStartConvCmd(ADC1, ENABLE);
 
     while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC))
 
     {
 
       return ADC_GetConversionValue(ADC1);
 
     }
 
   }
 
   /**
 
    * Initialization of ADC and the poentiomenter's GPIO
 
    */
 
   uint16_t badprogADC() {
 
       /// declaring GPIO stuff
 
       GPIO_InitTypeDef GPIO_InitStructure;
 
       // declaring ADC struct
 
       ADC_InitTypeDef ADC_InitStructure;
 
 
 
 
       // deinit ADC
 
       ADC_DeInit(ADC1);
 
 
       // enabling clock
 
       RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
 
       // enabling ADC clock
 
       RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
 
 
       // B - Init the GPIO with the structure - Testing ADC
 
       GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
 
       GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
 
       //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
 
       GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AIN;
 
       //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;//The pins are configured in analog mode
 
 
       GPIO_Init(GPIOB, &GPIO_InitStructure);
 
       //GPIO_ResetBits(GPIOB,GPIO_Pin_7);
 
         //GPIO_ResetBits(GPIOB,GPIO_Pin_6);
 
 
       // init ADC struct
 
       ADC_StructInit(&ADC_InitStructure);
 
 
       // setting the ADC struct
 
       ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
 
       ADC_InitStructure.ADC_ScanConvMode = DISABLE;
 
       ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
 
       ADC_InitStructure.ADC_ExternalTrigConv = 0;//ADC_ExternalTrigConv_None;
 
       ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
 
       ADC_InitStructure.ADC_NbrOfChannel = 2;
 
 
       ADC_DMA_init();
 
 
 
         // init adc
 
       ADC_Init(ADC1, &ADC_InitStructure);
 
 
       // enable ADC
 
       ADC_Cmd(ADC1, ENABLE);
 
 
 
         ADC_DMACmd(ADC1, DISABLE);   
 
      /* Enable DMA mode for ADC1 */ 
 
       ADC_DMACmd(ADC1, ENABLE);
 
 
 
       // start ADC1 calibration and check the end
 
       ADC_StartCalibration(ADC1);
 
 
       // configure ADC_IN6
 
       ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 1, ADC_SampleTime_7Cycles5);
 
         ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 1, ADC_SampleTime_7Cycles5); ///added
 
 
       // start ADC -> retrieve the ADC value from the potentiometer
 
       // and add it into ADC1->DR with:
 
       // ADCx->CR2 |= CR2_EXTTRIG_SWSTART_Set;
 
       // this without using ADC1->DR o_O
 
       // CR2 = Configuration Register2 -> it seems to be a config with
 
       // a binary number -> for example 1000010100101010 which sets all
 
       // registers with default values
 
       ADC_SoftwareStartConvCmd(ADC1, ENABLE);
 
         // Make sure we have conversion completion
 
       while( ADC_GetFlagStatus( ADC1, ADC_FLAG_EOC ) == RESET )
 
   {
 
       // do nothing (or something useful perhaps)
 
   }
 
         // Wait until ADC is ready
 
       //while (ADC_GetFlagStatus(ADC1, ADC_FLAG_ADONS) == RESET);
 
       // check the end of the ADC1 calibration
 
       // setting ADC1->DR with:
 
       // if ((ADCx->CR2 & CR2_CAL_Set) != (uint32_t)RESET)
 
       while (ADC_GetCalibrationStatus(ADC1) == SET);
 
 
        // Reset the flag
 
       ADC_ClearFlag(ADC1, ADC_FLAG_EOC);
 
 
       // convert valueADC to valueVolt -> valueADC * (MAX VOLT / 2^12)
 
       // and also :
 
       // ADC_SoftwareStartConvCmdsoftwareS,
 
       // ADC_GetCalibrationStatus
 
       // with
 
       // return (uint16_t) ADCx->DR;
 
       uint16_t valueADC = ADC_GetConversionValue(ADC1);
 
 
       // convert the "uint_16 valueADC" into a "float valueVolt"
 
       // Volt = 3.3
 
       // ADC = 12 bits, so 2^12 = 4096
 
       float valueVolt = valueADC * (3.3 / 4095);
 
 
       //return valueVolt;
 
         //return ADC_GetConversionValue(ADC1);
 
         return ADC1ConvertedValue[0];
 
         //return Get_ADC_Converted_Value();
 
   }

And by changing the two last line of codes to this kind:

//return ADC1ConvertedValue[0];
 
         return Get_ADC_Converted_Value();

Touch shown 0 for untouched and around 3940 for touched.

Some part of main function is shown Below:

while (1) {
    		GUI_Clear();
    		GUI_SetBkColor(GUI_BLACK);
    		GUI_SetColor(GUI_CYAN);
    	sprintf(buffer, "%d\r\n", (int) TouchScreen_readPressure());GUI_Delay(300);
    		// GUI_Init(); GUI_Delay(300);
    	GUI_DispStringHCenterAt(buffer, xSize / 3, ySize - 111);	GUI_Delay(300);
    		GUI_DispStringAt("GUI_DispFloat:\n", 11, 11);
    		GUI_GotoX(100);
    		GUI_GotoY(100);
    		//f=(float) TouchScreen_readPressure();
    		//GUI_DispFloat(f,9);
    	GUI_Delay(300);
    	}

So why this happended?

 this question in stackowerflow:

https://electronics.stackexchange.com/questions/424898/adc-stm32f013re-default-is-high-4059

Thanks