ADC conversion data to DMA without any DMA interrupt ??

SA V.1 · ‎2023-04-19

Hello team am Receving 16bit ADC conversion data to DMA in STM32H745i Disco in CubeIDE software. Here DMA interrupt is generating by default in software (i am disabled the interrupt in programming after that program counter is out of control) I dont want any ADC/DMA interrupt . DMA sholud receives the data contineously without any interrupt any solution for this ?

Kamil Duljas · ‎2023-04-20

Add HAL_ADC_Start_DMA before while
Try below settings for adc1
uint16_t ADC_Value[ADC_BUFFER_SIZE]; because data with in DMA is set to HALF_WORD

hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
  hadc1.Init.Resolution = ADC_RESOLUTION_16B;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = ENABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;
  hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
  hadc1.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;
  hadc1.Init.OversamplingMode = DISABLE;

Dudo

Kamil Duljas · ‎2023-04-20

I also don't see init DMA in your code:

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
 
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
  if(adcHandle->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */
 
  /* USER CODE END ADC1_MspInit 0 */
 
  /** Initializes the peripherals clock
  */
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
    PeriphClkInitStruct.PLL2.PLL2M = 2;
    PeriphClkInitStruct.PLL2.PLL2N = 12;
    PeriphClkInitStruct.PLL2.PLL2P = 4;
    PeriphClkInitStruct.PLL2.PLL2Q = 2;
    PeriphClkInitStruct.PLL2.PLL2R = 2;
    PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_3;
    PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOMEDIUM;
    PeriphClkInitStruct.PLL2.PLL2FRACN = 0;
    PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL2;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
      Error_Handler();
    }
 
    /* ADC1 clock enable */
    __HAL_RCC_ADC12_CLK_ENABLE();
 
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC1 GPIO Configuration
    PA1_C     ------> ADC1_INP1
    */
    HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PA1, SYSCFG_SWITCH_PA1_OPEN);
 
    /* ADC1 DMA Init */
    /* ADC1 Init */
    hdma_adc1.Instance = DMA1_Stream1;
    hdma_adc1.Init.Request = DMA_REQUEST_ADC1;
    hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
    hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
    hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    hdma_adc1.Init.Mode = DMA_CIRCULAR;
    hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;
    hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
    {
      Error_Handler();
    }
 
    __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);
 
  /* USER CODE BEGIN ADC1_MspInit 1 */
 
  /* USER CODE END ADC1_MspInit 1 */
  }
}

Dudo

Kamil Duljas · ‎2023-04-20

Some example:

Dudo

SA V.1 · ‎2023-04-20

Thank you for" your HELP" i made the changes above and checked no output . I thought we Can't get WIthout the DMA interrupt . Can you discuss with your collegue or those who have highly known about this topic and Reconfirm about this please ??

Kamil Duljas · ‎2023-04-20

I don't understand why you mix two topics: interrupts dma and receiving data from ADC. What's your target ? Receiving data or disabling interrupts from dma?

Dudo

SA V.1 · ‎2023-04-20

I have this section of code in my program in msp.c file bellow i am attached .My target is to receive ADC conversion Data to DMA i achived this Succesfully but the thing is while Achiving this DMA will enable the interrupt to indicate half/full conversion is complete . i dont need any indication by interrupting half/full conversion is completed that should do that work backend whenever i want i will access that data hope you undestood my point .

And one more dout while initializing Functions for Example

1. MX_GPIO_Init();

2.HAL_ADC_MspInit();

Above are function but MX ,Msp whats that can you give more info about this ??

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file         stm32h7xx_hal_msp.c
  * @brief        This file provides code for the MSP Initialization
  *               and de-Initialization codes.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2023 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* USER CODE BEGIN Includes */
 
/* USER CODE END Includes */
extern DMA_HandleTypeDef hdma_adc1;
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */
 
/* USER CODE END TD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN Define */
 
/* USER CODE END Define */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN Macro */
 
/* USER CODE END Macro */
 
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
 
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */
 
/* USER CODE END PFP */
 
/* External functions --------------------------------------------------------*/
/* USER CODE BEGIN ExternalFunctions */
 
/* USER CODE END ExternalFunctions */
 
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
/**
  * Initializes the Global MSP.
  */
void HAL_MspInit(void)
{
  /* USER CODE BEGIN MspInit 0 */
 
  /* USER CODE END MspInit 0 */
 
  __HAL_RCC_SYSCFG_CLK_ENABLE();
 
  /* System interrupt init*/
 
  /* USER CODE BEGIN MspInit 1 */
 
  /* USER CODE END MspInit 1 */
}
 
/**
* @brief ADC MSP Initialization
* This function configures the hardware resources used in this example
* @param hadc: ADC handle pointer
* @retval None
*/
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
  if(hadc->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */
 
  /* USER CODE END ADC1_MspInit 0 */
 
  /** Initializes the peripherals clock
  */
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
    PeriphClkInitStruct.PLL2.PLL2M = 4;
    PeriphClkInitStruct.PLL2.PLL2N = 12;
    PeriphClkInitStruct.PLL2.PLL2P = 8;
    PeriphClkInitStruct.PLL2.PLL2Q = 2;
    PeriphClkInitStruct.PLL2.PLL2R = 2;
    PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_3;
    PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOWIDE;
    PeriphClkInitStruct.PLL2.PLL2FRACN = 0;
    PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL2;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
      Error_Handler();
    }
 
    /* Peripheral clock enable */
    __HAL_RCC_ADC12_CLK_ENABLE();
 
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC1 GPIO Configuration
    PA0_C     ------> ADC1_INP0
    */
    HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PA0, SYSCFG_SWITCH_PA0_OPEN);
 
    /* ADC1 DMA Init */
    /* ADC1 Init */
    hdma_adc1.Instance = DMA1_Stream0;
    hdma_adc1.Init.Request = DMA_REQUEST_ADC1;
    hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
    hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
    hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    hdma_adc1.Init.Mode = DMA_CIRCULAR;
    hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;
    hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
    {
      Error_Handler();
    }
 
    __HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);
 
  /* USER CODE BEGIN ADC1_MspInit 1 */
 
  /* USER CODE END ADC1_MspInit 1 */
  }
 
}
 
/**
* @brief ADC MSP De-Initialization
* This function freeze the hardware resources used in this example
* @param hadc: ADC handle pointer
* @retval None
*/
void HAL_ADC_MspDeInit(ADC_HandleTypeDef* hadc)
{
  if(hadc->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspDeInit 0 */
 
  /* USER CODE END ADC1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_ADC12_CLK_DISABLE();
 
    /* ADC1 DMA DeInit */
    HAL_DMA_DeInit(hadc->DMA_Handle);
  /* USER CODE BEGIN ADC1_MspDeInit 1 */
 
  /* USER CODE END ADC1_MspDeInit 1 */
  }
 
}
 
/* USER CODE BEGIN 1 */
 
/* USER CODE END 1 */

Thank you

Best Regardas

Sharath A V

Kamil Duljas · ‎2023-04-21

Ok, so achieved your target with DMA. Interrupts You can still disable in the nvic label if you want:

You say about this fuction:

1. MX_GPIO_Init();

2.HAL_ADC_MspInit();

what's problem with their?

Dudo

SA V.1 · ‎2023-04-21

Thank you sir for your Help .Now You got the my point After disabling the NVIC for DMA i didn't get Any Data's Why ? (if you are achived this Can you share the Code/Zip file it would be very helpfull) . whenever DMA NVIC present that time i got the Data no issues working Fine.

about this fuction:

1. MX_GPIO_Init();

2.HAL_ADC_MspInit(); no issues just came to know whats the meaning of MX ,Msp thats it .

Kamil Duljas · ‎2023-04-21

Sorry but i haven't this board so I don't test my own code. H7XX is more complicate because it has 2 cores.

DMA interrupts should not impact on data. Do You use callbacks?

Maybe share your code on github or gitlab?

Dudo

LCE · ‎2023-04-21

You will learn a lot when reading the reference manual and the registers, then looking into the HAL functions to see what's going on.

So you might check what's going on in:

HAL_ADC_Start_DMA() shows you that DMA interrupts are enabled.

And the callback functions ADC_DMAHalfConvCplt() and ADC_DMAConvCplt() are set for DMA interrupt callbacks. Which do some housekeeping and then call the HAL ADC callbacks... (which shows us that this might not be the fastest solution...)

HAL_DMA_IRQHandler() which is called at each DMA interrupt.

It's mostly error handling, but also resetting (half-) transfer complete flags, and calling the (half-) transfer complete callback functions.

So all that might give you the hint that you need the DMA interrupts for that ADC DMA stream.

What you do in the HAL ADC callbacks is your thing.

Maybe set a flag to show that new data is available?

Anyway, when using ADC with DMA you do NOT need that ADC_get_value_whatever function, DMA is writing the ADC values directly into the specified buffer at DMA start.

Stop relying on CubeMX and HAL stuff alone. Start learning and thinking!