ADC DualMode Interl

[sanaz]

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

[sanaz]

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]

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]

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

[Tesla DeLorean]

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