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ADC DualMode Interl

sanaz
Associate II
Posted on December 29, 2015 at 15:51

hello

I wanna use ADC Dual Mode Interl with DMA1. I use following code but it doesn't work! where is the problem?! I cannot use DMA2. Iused DMA2 for other peripheral....

&sharpinclude <stm32f4xx_gpio.h>

&sharpinclude <stm32f4xx_rcc.h>

&sharpinclude <stm32f4xx_tim.h>

&sharpinclude ''stm32F4xx.h''

/** @addtogroup STM32F4_Discovery_Peripheral_Examples

  * @{

  */

/** @addtogroup ADC_Interleaved_DMAmode2

  * @{

  */

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

&sharpdefine ADC_CDR_ADDRESS    ((uint32_t)0x40012308)

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

__IO uint32_t ADCDualConvertedValue[2];

ADC_InitTypeDef       ADC_InitStructure;

ADC_CommonInitTypeDef ADC_CommonInitStructure;

DMA_InitTypeDef       DMA_InitStructure;

GPIO_InitTypeDef      GPIO_InitStructure;

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/**

  * @brief   Main program

  * @param  None

  * @retval None

  */

int main(void)

{

  /*!< At this stage the microcontroller clock setting is already configured,

       this is done through SystemInit() function which is called from startup

       file (startup_stm32f4xx.s) before to branch to application main.

       To reconfigure the default setting of SystemInit() function, refer to

       system_stm32f4xx.c file

     */     

/******************************************************************************/

/*               ADCs interface clock, pin and DMA configuration              */

/******************************************************************************/

       

  /* Enable peripheral clocks */

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOC, ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 , ENABLE);

  /* Configure ADC Channel 12 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, &GPIO_InitStructure);

  /* DMA1 Stream5 channel7 configuration */

  DMA_InitStructure.DMA_Channel = DMA_Channel_7;  

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_CDR_ADDRESS;

  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCDualConvertedValue;

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;

  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_Word;

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;

  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(DMA1_Stream5, &DMA_InitStructure);

  /* DMA1_Stream5 enable */

  DMA_Cmd(DMA1_Stream5, ENABLE);

/******************************************************************************/

/*  ADCs configuration: triple interleaved with 5cycles delay to reach 6Msps  */

/******************************************************************************/

  /* ADC Common configuration *************************************************/

  ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_Interl;

  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;

  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;  

  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;

  ADC_CommonInit(&ADC_CommonInitStructure);

  /* ADC1 regular channel 12 configuration ************************************/

  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, &ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 1, ADC_SampleTime_3Cycles);

 

  /* Enable ADC1 DMA */

  ADC_DMACmd(ADC1, ENABLE);

  /* ADC2 regular channel 12 configuration ************************************/

  ADC_Init(ADC2, &ADC_InitStructure);

  /* ADC2 regular channel12 configuration */

  ADC_RegularChannelConfig(ADC2, ADC_Channel_12, 1, ADC_SampleTime_3Cycles);

  /* Enable DMA request after last transfer (multi-ADC mode) ******************/

  ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);

  /* Enable ADC1 **************************************************************/

  ADC_Cmd(ADC1, ENABLE);

  /* Enable ADC2 **************************************************************/

  ADC_Cmd(ADC2, ENABLE);

    

  /* Start ADC1 Software Conversion */

  ADC_SoftwareStartConv(ADC1);

  while (1)

  {

  }

}

#rtfm
4 REPLIES 4
sanaz
Associate II
Posted on January 01, 2016 at 15:46

baird.hal, many thanks  for your answer. I used DMA2 for two peripheral and it worked. I didn't test DMA2 for two peripheral before and I didn't think that may work.

sanaz
Associate II
Posted on January 01, 2016 at 15:49

clive, your right. I made mistake between DAC and ADC. the stream and channel I said in my last post was for DAC!! I use DMA2. it do well...

raptorhal2
Lead
Posted on December 29, 2015 at 16:12

I believe the peripheral assignments to DMA/Channel/Stream are fixed as defined in section 4.3.3 of the reference manual. Use DMA2 for more than one peripheral.

Cheers, Hal

Posted on December 29, 2015 at 21:28

Look you can't just invent random connectivity in your head. The DMA channels/streams have very specific connections. DMA2 has EIGHT independent streams, TWO available to ADC1. DMA1 has ZERO available to ADC1, and thus will NEVER work.

http://www.st.com/web/en/resource/technical/document/reference_manual/DM00031020.pdf

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