用
单片机采集分压电阻过来的电压值，在调试期间，发现初始化完IO口后，ADC输入IO口的电压会上浮200mv左右，开始ADC采集时，会出现低电平脉冲，频率是ADC的采集频率，即35.7K。同时，采集到的电压值也不准确，不同电压值，ADC输出口上浮的电压不同。采集到的电压值和实际值偏差也不是固定，感觉有一个关系。
程序上是采用ADC+DMA的采集方式，数据是通过半传输完成这中断+传输完成中断里得到的，每次采集100个数据（数组）。一直连续采集500ms后停止，找出这一阶段中采集到的最大值。
程序如下
/* USER CODE END Header *//* Includes ------------------------------------------------------------------*/#include "adc.h"/* USER CODE BEGIN 0 */#include "
tim.h"uint16_t adc_data[100]= {0};/* USER CODE END 0 */ADC_HandleTypeDef hadc1;DMA_HandleTypeDef hdma_adc1;/* ADC1 init function */void MX_ADC1_Init(void){ /* USER CODE BEGIN ADC1_Init 0 */ /* USER CODE END ADC1_Init 0 */ ADC_ChannelConfTypeDef sConfig = {0}; /* USER CODE BEGIN ADC1_Init 1 */ /* USER CODE END ADC1_Init 1 */ /** Common config */ hadc1.Instance = ADC1; hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 1; if (HAL_ADC_Init( hadc1) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_14; sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5; if (HAL_ADC_ConfigChannel( hadc1, sConfig) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN ADC1_Init 2 */ //HAL_ADCEx_Calibration_Start( hadc1); /* USER CODE END ADC1_Init 2 */}void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle){ GPIO_InitTypeDef GPIO_InitStruct = {0}; if(adcHandle->Instance==ADC1) { /* USER CODE BEGIN ADC1_MspInit 0 */ GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; /* USER CODE END ADC1_MspInit 0 */ /* ADC1 clock enable */ __HAL_RCC_ADC1_CLK_ENABLE(); __HAL_RCC_GPIOC_CLK_ENABLE(); /**ADC1 GPIO Configuration PC4 ------> ADC1_IN14 */ GPIO_InitStruct.Pin = GPIO_PIN_4; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; HAL_GPIO_Init(GPIOC, 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_HALFWORD; hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; hdma_adc1.Init.Mode = DMA_CIRCULAR; hdma_adc1.Init.Priority = DMA_PRIORITY_LOW; if (HAL_DMA_Init( hdma_adc1) != HAL_OK) { Error_Handler(); } __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1); /* ADC1 interrupt Init */ HAL_NVIC_SetPriority(ADC1_2_IRQn, 2, 2); HAL_NVIC_EnableIRQ(ADC1_2_IRQn); /* USER CODE BEGIN ADC1_MspInit 1 */ __HAL_DMA_DISABLE_IT( hdma_adc1,DMA_IT_TC | DMA_IT_HT); // HAL_DMA_RegisterCallback( hdma_adc1, HAL_DMA_XFER_CPLT_CB_ID, ADCDataCollect_DmaCplCb); // HAL_DMA_RegisterCallback( hdma_adc1, HAL_DMA_XFER_HALFCPLT_CB_ID, ADCDataCollect_DmaHalfCplCb); /* USER CODE END ADC1_MspInit 1 */ }}void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle){ if(adcHandle->Instance==ADC1) { /* USER CODE BEGIN ADC1_MspDeInit 0 */ /* USER CODE END ADC1_MspDeInit 0 */ /* Peripheral clock disable */ __HAL_RCC_ADC1_CLK_DISABLE(); /**ADC1 GPIO Configuration PC4 ------> ADC1_IN14 */ HAL_GPIO_DeInit(GPIOC, GPIO_PIN_4); /* ADC1 DMA DeInit */ HAL_DMA_DeInit(adcHandle->DMA_Handle); /* ADC1 interrupt Deinit */ HAL_NVIC_DisableIRQ(ADC1_2_IRQn); /* USER CODE BEGIN ADC1_MspDeInit 1 */ /* USER CODE END ADC1_MspDeInit 1 */ }}/* USER CODE BEGIN 1 *//** * @brief 鍚姩ADC+DMA浼犺緭 * @retval None */void ADC1Star(void){ //HAL_ADCEx_Calibration_Start( hadc1); //HAL_Delay(100); HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn); HAL_NVIC_EnableIRQ(ADC1_2_IRQn); __HAL_DMA_ENABLE_IT( hdma_adc1, DMA_IT_TE | DMA_IT_TC); HAL_ADC_Start_DMA( hadc1,(uint32_t*)adc_data,100);}/** * @brief 鍏抽棴ADC+DMA浼犺緭 * @retval None */void ADC1Stop(void){ HAL_NVIC_DisableIRQ(DMA1_Channel1_IRQn); HAL_NVIC_DisableIRQ(ADC1_2_IRQn); __HAL_DMA_CLEAR_FLAG( hdma_adc1, __HAL_DMA_GET_HT_FLAG_INDEX( hdma_adc1)); __HAL_DMA_CLEAR_FLAG( hdma_adc1, __HAL_DMA_GET_TC_FLAG_INDEX( hdma_adc1)); __HAL_DMA_DISABLE_IT( hdma_adc1, DMA_IT_TE | DMA_IT_TC); HAL_ADC_Stop_DMA( hadc1); //HAL_ADC_MspDeInit( hadc1);}/** * @brief DMA半传输完成中断 * @retval None */void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc){ uint8_t i; if(__HAL_TIM_GET_COUNTER( htim1) < 4920) { for(i = 0;i<50;i++) { if(adc_data[i] > S_GLOBAL_VARIBLE.ultrasonic_ADC_DATA) { S_GLOBAL_VARIBLE.ultrasonic_ADC_DATA = adc_data[i];//找出最大值 } } } //__HAL_DMA_ENABLE_IT( hdma_adc1,DMA_IT_TC); //启动全传输完成中断}/** * @brief DMA全传输完成中断 * @retval None */void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc){ uint8_t i; if(__HAL_TIM_GET_COUNTER( htim1) < 4920) { for(i = 50;i<100;i++) { if(adc_data[i] > S_GLOBAL_VARIBLE.ultrasonic_ADC_DATA) { S_GLOBAL_VARIBLE.ultrasonic_ADC_DATA = adc_data[i];//找到最大值 } } } //__HAL_DMA_ENABLE_IT( hdma_adc1,DMA_IT_HT);//启动半传输完成中断}/* USER CODE END 1 */
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