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Adc3 Dma no value (STM32F4xx)

Question asked by rossi.alessandro.002 on Jan 13, 2014
Latest reply on Jan 16, 2014 by rossi.alessandro.002
I' m trying to save two ADC3 values in memory using dma, but nothing is stored in the memory, someone can help me, my code is:

int main(void)
{
 

    //Configuration of the ADC channels used
   ADC_Config();
  
   
    ADC_SoftwareStartConv(ADC3);
    printf("start");
 
    while(1)
  {
      //ADC_val=ADCConvertedValues[0];
    if (ADCConvertedValues[1] != 0xFFFF)
    {
      printf("%X %X \n", ADCConvertedValues[0], ADCConvertedValues[1]);
      //ADCConvertedValues[1] = 0xFFFF;
    }
  }
 
}
static void ADC_Config(void)
{
  ADC_InitTypeDef       ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  DMA_InitTypeDef       DMA_InitStructure;
 
  /* Enable peripheral clocks *************************************************/
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
 
  /* DMA2_Stream0 channel0 configuration **************************************/
  DMA_DeInit(DMA2_Stream0);
  DMA_InitStructure.DMA_Channel = DMA_Channel_2;// Channel 0 as mentionned in the datasheet ??
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC3->DR;// Address of ADC3 peripheral ??
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValues[0];// pointer on my data
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;// From ADC to memory
  DMA_InitStructure.DMA_BufferSize = 3;// 2 data to bring back (2 ANA input)
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;// No incrementation of peripheral, always read at the same address
  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);
  /* DMA2_Stream0 enable */
  DMA_Cmd(DMA2_Stream0, ENABLE);
 
  /* ADC Common Init **********************************************************/
  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_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);
 
  /* ADC3 Init ****************************************************************/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_8b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge =ADC_ExternalTrigConvEdge_None ;
  ADC_InitStructure.ADC_ExternalTrigConv =ADC_ExternalTrigConv_T1_CC1 ;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 2;
  ADC_Init(ADC3, &ADC_InitStructure);
 
  /* ADC3 regular channel configuration ******************************/
  ADC_RegularChannelConfig(ADC3, ADC_Channel_9, 1, ADC_SampleTime_480Cycles);//PF3
  ADC_RegularChannelConfig(ADC3, ADC_Channel_14, 2, ADC_SampleTime_480Cycles);//PF4
 
 
  /* Enable DMA request after last transfer (Single-ADC mode) */
  ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
 

  ADC_DMACmd(ADC3, ENABLE);
 
   **************************************************************/
  ADC_Cmd(ADC3, ENABLE);
}

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