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ADC and DMA

Question asked by sanchez.mari_paz on Nov 12, 2015
Latest reply on Nov 24, 2015 by sanchez.mari_paz
Hi everybody!!
I'm doing a program in which I would like to read two ADC channel but I couldn't. I use to do this the ADC and the DMA. I don't known what is wrong in my code. 

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


/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address    ((uint32_t)0x4001244C)


/* Public variables ----------------------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStruct;
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
__IO uint16_t ADC1ConvertedValue [2] = {0};


/* Public functions ----------------------------------------------------------*/
void RCC_Configuration()
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);  
}


void GPIO_Configuration()
{
  /* Condigure ADC Channel 10*/
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;                                        // We are going to use PC1
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;                                    // Analog input mode
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;                                // Set GPIO speed
  GPIO_Init(GPIOC, &GPIO_InitStruct);
  
  /* Condigure ADC Channel 12*/
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;                                        // We are going to use PC2
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;                                    // Analog input mode
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;                                // Set GPIO speed
  GPIO_Init(GPIOC, &GPIO_InitStruct);
}


void DMA_Configuration()
{
    /* DMA1 channel1 configuration ----------------------------------------------*/
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC1ConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 2;                                                                                    
  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_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);  
  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);
}


void ADC_Configuration()
{
    /* ADC1 configuration ------------------------------------------------------*/
  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 = 2;
  ADC_Init(ADC1, &ADC_InitStructure);
  
  /* ADC1 regular channels configuration */ 
  ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_28Cycles5);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_28Cycles5);
  
  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);
  
  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);


  /* Enable ADC1 reset calibration register */   
  ADC_ResetCalibration(ADC1);
  /* Check the end of ADC1 reset calibration register */
  while(ADC_GetResetCalibrationStatus(ADC1));


  /* Start ADC1 calibration */
  ADC_StartCalibration(ADC1);
  /* Check the end of ADC1 calibration */
  while(ADC_GetCalibrationStatus(ADC1));


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


  /* Enable ADC1 reset calibration register */   
  ADC_ResetCalibration(ADC1);
  /* Check the end of ADC1 reset calibration register */
  while(ADC_GetResetCalibrationStatus(ADC1));


  /* Start ADC1 calibration */
  ADC_StartCalibration(ADC1);
  /* Check the end of ADC1 calibration */
  while(ADC_GetCalibrationStatus(ADC1));
}




/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
void main(void)
{
  int i = 0;
  float tensionADC1 = 0;
  float tensionADC2 = 0;
  float tension1 = 0;
  float tension2 = 0;
  
  RCC_Configuration();
  GPIO_Configuration();
  DMA_Configuration();
  ADC_Configuration();
  
  tensionADC1 = 0;
  tensionADC2 = 0;
  tension1 = 0;
  tension2 = 0;
  
   for (i=0; i<1000; i++)                                                       // ADC measurement loop
   {
     ADC_SoftwareStartConvCmd(ADC1, ENABLE);
     //while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
     tensionADC1 += ((ADC1ConvertedValue[0])*(3.3/4096));
     tensionADC2 += ((ADC1ConvertedValue[1])*(3.3/4096));
   }
   
   tension1 = tensionADC1/1000;
   tension2 = tensionADC2/1000;
   
   printf("%f", tension1);
   printf("%f", tension2);
   
   while(1);
}
/************************** (C) COPYRIGHT 2015 GIE ************END OF FILE*****/

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