Adc continuous mode problem

[Hasan Sabri]

Posted on March 30, 2018 at 17:23

Hello,

I'am getting the data from adc using dma and adc is triggered by timer1s update event. My purpose is sampling the input continuously via adc to a circular buffer at background.

Problem is adc is working as in on one shot mode. After starting adc with HAL_ADC_Start_DMA function adstart bit becomes 0 and adc not restarts itself.

adc init

static void MX_ADC1_Init(void)

{  ADC_MultiModeTypeDef multimode;  ADC_ChannelConfTypeDef sConfig;    /**Common config     */  hadc1.Instance = ADC1;  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;  hadc1.Init.Resolution = ADC_RESOLUTION_8B;  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;  hadc1.Init.ContinuousConvMode = ENABLE;  hadc1.Init.DiscontinuousConvMode = DISABLE;  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T1_TRGO;  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;  hadc1.Init.NbrOfConversion = 1;  hadc1.Init.DMAContinuousRequests = DISABLE;  hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;  hadc1.Init.LowPowerAutoWait = DISABLE;  hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;  if (HAL_ADC_Init(&hadc1) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }    /**Configure the ADC multi-mode     */  multimode.Mode = ADC_MODE_INDEPENDENT;  if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }    /**Configure Regular Channel     */  sConfig.Channel = ADC_CHANNEL_1;  sConfig.Rank = ADC_REGULAR_RANK_1;  sConfig.SingleDiff = ADC_SINGLE_ENDED;  sConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;  sConfig.OffsetNumber = ADC_OFFSET_NONE;  sConfig.Offset = 0;  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }}

Timer init

static void MX_TIM1_Init(void)

{  TIM_ClockConfigTypeDef sClockSourceConfig;  TIM_MasterConfigTypeDef sMasterConfig;  htim1.Instance = TIM1;  htim1.Init.Prescaler = 0;  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;  htim1.Init.Period = 150;  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;  htim1.Init.RepetitionCounter = 0;  htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;  sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }}

Msp_Init

void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)

{  GPIO_InitTypeDef GPIO_InitStruct;  if(hadc->Instance==ADC1)  {  /* USER CODE BEGIN ADC1_MspInit 0 */  /* USER CODE END ADC1_MspInit 0 */    /* Peripheral clock enable */    __HAL_RCC_ADC12_CLK_ENABLE();      /**ADC1 GPIO Configuration        PA0     ------> ADC1_IN1     */    GPIO_InitStruct.Pin = GPIO_PIN_0;    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;    GPIO_InitStruct.Pull = GPIO_NOPULL;    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);    /* ADC1 DMA Init */    /* ADC1 Init */    hdma_adc1.Instance = DMA1_Channel1;    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_BYTE;    hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;    hdma_adc1.Init.Mode = DMA_CIRCULAR;    hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;    if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)    {      _Error_Handler(__FILE__, __LINE__);    }    __HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1);    /* ADC1 interrupt Init */    HAL_NVIC_SetPriority(ADC1_2_IRQn, 0, 0);    HAL_NVIC_EnableIRQ(ADC1_2_IRQn);  /* USER CODE BEGIN ADC1_MspInit 1 */  /* USER CODE END ADC1_MspInit 1 */  }}#adc #circular-buffer #stm32f3 #dma

[jean-christophe Toussaint]

Posted on March 30, 2018 at 20:01

Dear Hasan

I produced a complete tutorial about that :

https://community.st.com/0D50X00009bMM4uSAG

 

your feedback would be most welcomed.

Bye

JC

[Dominik Dráb]

Posted on March 30, 2018 at 20:13

I think the problem is:

hadc1.Init.DMAContinuousRequests = DISABLE;�?

Try changing it to ENABLE