ADC and DMA

Posted on November 12, 2015 at 18:21

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*****/