ADC DMA wrong values

Hi,

I'm facing some problem with ADC and DMA of STM32f103 uC.

I have a stm32f103 board and I had configured it to use ADC with DMA. Both configurations are taken from examples codes. I connected at PC0 pin to a potentiometer. This potentiometer is connected to 3.3V and GND.

I must read something between 0 and 4095 but I'm getting always 4095. It seems not to recognize values in this interval. In parallel I have a multimeter in the same point of ADC input. It shows 1,45V but ADC shows me 4095. When multimeter shows 0,05V my ADC shows something that is not constant. Below this value the ADC shows 0.

CODE:

vu16 ADC_RegularConvertedValueTab[3];

RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if (HSEStartUpStatus == SUCCESS)
{
        FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
        FLASH_SetLatency(FLASH_Latency_2);
        RCC_HCLKConfig(RCC_SYSCLK_Div1);
        RCC_PCLK1Config(RCC_HCLK_Div1);
        RCC_PCLK2Config(RCC_HCLK_Div2);
        RCC_ADCCLKConfig(RCC_PCLK2_Div6);
        /* PLLCLK = 8MHz * 9 = 72 MHz */
        RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
        RCC_PLLCmd(ENABLE);
        while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {}
        RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
        while (RCC_GetSYSCLKSource() != 0x08) {}
}
#ifdef  VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 | RCC_AHBPeriph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = 0x4001244C;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC_RegularConvertedValueTab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 3;
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_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 3;
ADC_Init(ADC1, &ADC_InitStructure);

ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_55Cycles5);

ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
ADC_SoftwareStartConvCmd(ADC1, ENABLE);

Some help would be appreciated.

Thank you,