Question
Adc continuous mode problem
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