ADC & DMA programming issues on STM32F4 Discovery Board

Hello I’m new to the STM32 world and I’m making some experiments with the STM32F4 Discovery Board.

I would like to measure the VBAT and Temperature sensor signals using the ADC1 and the DMA, continously scanning both the channels.
The results I obtain are quite in the expected values …but I can see no significant changes for example varying the temperature applied to the microcontroller case.
I suspect that the ADC stops the conversions or the DMA stops the transferring.
I’m getting slightly insane with the ADC and DMA initialization.
I use the STM32F4xx DSP and Standard Peripherals Library and the MDK 4.6 32K Version (for the moment, then I will buy the complete license).
Is there anybody willing to give me some advice?
Here below you will find the code I use.

Thank you
Antonio (Milano - Italy)

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_ADDRESS    ((uint32_t)0x4001204C)
#define V25                0.760
#define AVG_SLOPE          25.0
#define BUFFERLENGHT       2

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint16_t ADC1ConvertedValue[BUFFERLENGHT];
__IO uint32_t ADC1ConvertedVoltage0 = 0;
__IO uint32_t ADC1ConvertedVoltage1 = 0;
__IO float Vsense = 0.0;
__IO float TCelsius = 0.0;
__IO float VBATVoltage = 0.0;

/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

void ADC1_DMA_Config(void)
{
  ADC_InitTypeDef       ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  DMA_InitTypeDef       DMA_InitStructure;

  /* Enable ADC1, DMA2 clocks *************************************************/
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  /* DMA2 Stream0 channel0 configuration **************************************/
  DMA_DeInit(DMA2_Stream0);
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = BUFFERLENGHT;
  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_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);
  DMA_Cmd(DMA2_Stream0, ENABLE);

  /* ADC Common Init **********************************************************/
  ADC_DeInit();
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);

  /* ADC1 Init ****************************************************************/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_ExternalTrigConv = 0;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = BUFFERLENGHT;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

  /* ADC1 regular channel18 (VBAT) & channel16 (TempSensor) configuration *****/
  ADC_RegularChannelConfig(ADC1, ADC_Channel_Vbat, 1, ADC_SampleTime_480Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_TempSensor, 2, ADC_SampleTime_480Cycles);

  /* Enable VBAT channel: channel18 */
  ADC_VBATCmd(ENABLE);

  /* Enable TempSensor and Vrefint channels: channel16 and channel17 */
  ADC_TempSensorVrefintCmd(ENABLE);

  /* Enable DMA request after last transfer (Single-ADC mode) */
  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);
}

int main(void)
{

  SystemCoreClockUpdate();                      /* Get Core Clock Frequency   */

  if (SysTick_Config(SystemCoreClock / 1000)) { /* SysTick 1 msec interrupts  */
    while (1);                                  /* Capture error              */
  }

  /* ADC1 Channel Temperature Sensor & VBAT measurement configuration */
  ADC1_DMA_Config();

 /* Start ADC1 Software Conversion */
  ADC_SoftwareStartConv(ADC1);

  while (1)
  {
 /* The VBAT pin is internally connected to a bridge divider by 2 */
 ADC1ConvertedVoltage1 = (uint32_t)(ADC1ConvertedValue[0] * 2) * 3300 / 0xfff;
 VBATVoltage = (float)(ADC1ConvertedVoltage1 / 1000.0);

 ADC1ConvertedVoltage0 = (uint32_t)(ADC1ConvertedValue[1] * 3300 / 0xfff);
 Vsense = (float)(ADC1ConvertedVoltage0 / 1000.0);
 TCelsius = ((Vsense - V25) / AVG_SLOPE) + 25.0 ;
  }
}