title: STM32f4 ADC1 Dma configuration not working
body: <p>I am trying to configure ADC1 and run it. Using STM Peripheral examples for  ADC3 with DMA. In example I can see the changes in <strong>ADC3ConvertedValue</strong>. Here is example of working code:</p>
  
  <pre><code>    #include "stm32f4_discovery.h"
      #include &lt;stdio.h&gt;
  
      #define ADC3_DR_ADDRESS     ((uint32_t)0x4001224C)
  
      __IO uint16_t ADC3ConvertedValue = 0;
      __IO uint32_t ADC3ConvertedVoltage = 0;
  
      void ADC3_CH12_DMA_Config(void);
  
  
      int main(void)
      {
  
        ADC3_CH12_DMA_Config();
  
        ADC_SoftwareStartConv(ADC3);
  
        while (1)
        {
        /* convert the ADC value (from 0 to 0xFFF) to a voltage value (from 0V to       3.3V)*/
          ADC3ConvertedVoltage = ADC3ConvertedValue *3300/0xFFF;
    }
  }
  
  
      void ADC3_CH12_DMA_Config(void)
      {
         ADC_InitTypeDef       ADC_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        DMA_InitTypeDef       DMA_InitStructure;
        GPIO_InitTypeDef      GPIO_InitStructure;
  
  
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC,  ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
  
        /* DMA2 Stream0 channel0 configuration **************************************/
        DMA_InitStructure.DMA_Channel = DMA_Channel_2;  
        DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;
        DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&amp;ADC3ConvertedValue;
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
        DMA_InitStructure.DMA_BufferSize = 1;
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
        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, &amp;DMA_InitStructure);
        DMA_Cmd(DMA2_Stream0, ENABLE);
  
    /* Configure ADC3 Channel12 pin as analog input ******************************/
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
        GPIO_Init(GPIOC, &amp;GPIO_InitStructure);
  
        /* 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(&amp;ADC_CommonInitStructure);
  
        /* ADC3 Init ****************************************************************/
        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
        ADC_InitStructure.ADC_ScanConvMode = DISABLE;
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
        ADC_InitStructure.ADC_NbrOfConversion = 1;
        ADC_Init(ADC3, &amp;ADC_InitStructure);
  
         /* ADC3 regular channel12 configuration *************************************/
        ADC_RegularChannelConfig(ADC3, ADC_Channel_12, 1, ADC_SampleTime_3Cycles);
  
       /* Enable DMA request after last transfer (Single-ADC mode) */
        ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
  
        /* Enable ADC3 DMA */
        ADC_DMACmd(ADC3, ENABLE);
  
        /* Enable ADC3 */
        ADC_Cmd(ADC3, ENABLE);
       }
  </code></pre>
  
  <p>Here is my code with ADC1 configuration:</p>
  
  <pre><code>    /**
    ******************************************************************************
    * @file    ADC1_DMA/main.c 
  
      /* Includes ------------------------------------------------------------------*/
      #include "stm32f4_discovery.h"
      #include &lt;stdio.h&gt;
  
      #define ADC1_DR_ADDRESS     ((uint32_t)0x4001204C)
  
      __IO uint16_t ADC1ConvertedValue = 0;
      __IO uint32_t ADC1ConvertedVoltage = 0;
  
      void ADC1_CH12_DMA_Config(void);
  
  
      int main(void)
      {
  
        ADC1_CH12_DMA_Config();
  
        ADC_SoftwareStartConv(ADC1);
  
        while (1)
        {
        /* convert the ADC value (from 0 to 0xFFF) to a voltage value (from 0V to 3.3V)*/
          ADC1ConvertedVoltage = ADC1ConvertedValue *3300/0xFFF;
        }
      }
  
      void ADC1_CH12_DMA_Config(void)
      {
        ADC_InitTypeDef       ADC_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        DMA_InitTypeDef       DMA_InitStructure;
        GPIO_InitTypeDef      GPIO_InitStructure;
  
        /* Enable ADC1, DMA2 and GPIO clocks ****************************************/
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  
        /* DMA2 Stream0 channel0 configuration **************************************/
        DMA_InitStructure.DMA_Channel = DMA_Channel_2;  
        DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
        DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&amp;ADC1ConvertedValue;
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
        DMA_InitStructure.DMA_BufferSize = 1;
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
        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, &amp;DMA_InitStructure);
        DMA_Cmd(DMA2_Stream0, ENABLE);
  
        /* Configure ADC1 Channel12 pin as analog input ******************************/
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
        GPIO_Init(GPIOC, &amp;GPIO_InitStructure);
  
        /* 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(&amp;ADC_CommonInitStructure);
  
        /* ADC1 Init ****************************************************************/
        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
        ADC_InitStructure.ADC_ScanConvMode = DISABLE;
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
        ADC_InitStructure.ADC_NbrOfConversion = 1;
        ADC_Init(ADC1, &amp;ADC_InitStructure);
  
       /* ADC1 regular channel12 configuration *************************************/
        ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 1, ADC_SampleTime_3Cycles);
  
  
       /* Enable DMA request after last transfer (Single-ADC mode) */
        ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
  
        /* Enable ADC1 DMA */
        ADC_DMACmd(ADC1, ENABLE);
  
        /* Enable ADC1 */
        ADC_Cmd(ADC1, ENABLE);
       }
  </code></pre>
  
  <p>In <strong>ADC1ConvertedValue</strong> I always see zeroes. I replaced</p>
  
  <pre><code>DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
  </code></pre>
  
  <p>with</p>
  
  <pre><code>DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &amp; (ADC1-&gt;DR);
  </code></pre>
  
  <p>and still see zeroes.</p>