STM32F302 ADC问题

楼主，最好能贴出ADC的配置，应该采集的值时多少，实际采集到的是多少。这样好帮助分析。 先从配置进行分析，也可以单独进行10 11 15的数据采集来判断是不是配置的问题。

你的问题也犹如你ID名“迷”一般。 如果确认通道2、5结果正确，那ADC模块相关硬件及供电一般来讲不会有啥大问题。你检查下目前有问题的通道10/11/15外部线路有无影响AD采用的地方。再就是确认下软件配置方面,重点检查下这块。另外，初始化配置方面尽量使用CubeMx来完成，这样帮你省却很多工作量。

IO初始化如下 void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc) { GPIO_InitTypeDef GPIO_InitStruct = {0}; if(hadc->Instance==ADC1) { /* USER CODE BEGIN ADC1_MspInit 0 *//* USER CODE END ADC1_MspInit 0 */ /* Peripheral clock enable */ __HAL_RCC_ADC1_CLK_ENABLE();__HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /**ADC1 GPIO Configuration PC0 ------> ADC1_IN6 PC1 ------> ADC1_IN7 PC2 ------> ADC1_IN8 PC3 ------> ADC1_IN9 PA1 ------> ADC1_IN2 PA2 ------> ADC1_IN3 PA3 ------> ADC1_IN4 PA4 ------> ADC1_IN5 PA6 ------> ADC1_IN10 PA7 ------> ADC1_IN15 PB0 ------> ADC1_IN11 */ GPIO_InitStruct.Pin = ADC1_IN6_BDC1_Pin|ADC1_IN7_BDC2_Pin|ADC1_IN8_BDC3_Pin|ADC1_IN9_TEMP_Pin; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); GPIO_InitStruct.Pin = ADC1_IN2_VBUS_Pin|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4 |GPIO_PIN_6|BLDC_BK_CMP_Pin; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = ADC1_IN11_CURR_Pin; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(ADC1_IN11_CURR_GPIO_Port, &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_VERY_HIGH; if (HAL_DMA_Init(&hdma_adc1) != HAL_OK) { Error_Handler(); } __HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1); /* ADC1 interrupt Init */ HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0); HAL_NVIC_EnableIRQ(ADC1_IRQn); __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /**ADC1 GPIO Configuration PC0 ------> ADC1_IN6 PC1 ------> ADC1_IN7 PC2 ------> ADC1_IN8 PC3 ------> ADC1_IN9 PA1 ------> ADC1_IN2 PA2 ------> ADC1_IN3 PA3 ------> ADC1_IN4 PA4 ------> ADC1_IN5 PA6 ------> ADC1_IN10 PA7 ------> ADC1_IN15 PB0 ------> ADC1_IN11 */ GPIO_InitStruct.Pin = ADC1_IN6_BDC1_Pin|ADC1_IN7_BDC2_Pin|ADC1_IN8_BDC3_Pin|ADC1_IN9_TEMP_Pin; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOC, &GPIO_InitStruct); GPIO_InitStruct.Pin = ADC1_IN2_VBUS_Pin|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4 |GPIO_PIN_6|BLDC_BK_CMP_Pin; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = ADC1_IN11_CURR_Pin; GPIO_InitStruct.Mode = GPIO_MODE_ANALOG; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(ADC1_IN11_CURR_GPIO_Port, &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_VERY_HIGH; if (HAL_DMA_Init(&hdma_adc1) != HAL_OK) { Error_Handler(); } __HAL_LINKDMA(hadc,DMA_Handle,hdma_adc1); /* ADC1 interrupt Init */ HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0); HAL_NVIC_EnableIRQ(ADC1_IRQn); /* USER CODE BEGIN ADC1_MspInit 1 *//* USER CODE END ADC1_MspInit 1 */ }} ADC配置如下 {/* 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.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; hadc1.Init.Resolution = ADC_RESOLUTION_12B; hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 10; hadc1.Init.DMAContinuousRequests = ENABLE; hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV; hadc1.Init.LowPowerAutoWait = DISABLE; hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; if (HAL_ADC_Init(&hadc1) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_6; sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SingleDiff = ADC_SINGLE_ENDED; sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5; sConfig.OffsetNumber = ADC_OFFSET_NONE; sConfig.Offset = 0; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_7; sConfig.Rank = ADC_REGULAR_RANK_2; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_8; sConfig.Rank = ADC_REGULAR_RANK_3; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_2; sConfig.Rank = ADC_REGULAR_RANK_4; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_10; sConfig.Rank = ADC_REGULAR_RANK_5; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_11; sConfig.Rank = ADC_REGULAR_RANK_6; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_15; sConfig.Rank = ADC_REGULAR_RANK_7; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_3; sConfig.Rank = ADC_REGULAR_RANK_8; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_4; sConfig.Rank = ADC_REGULAR_RANK_9; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /** Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_5; sConfig.Rank = ADC_REGULAR_RANK_10; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN ADC1_Init 2 *//* USER CODE END ADC1_Init 2 */}

楼主，能详细说一下你的芯片类型吗？我用CubeMx查到PA6用的是ADC2，你看一下CubeMx的硬件配置。

[md]芯片型号是STM32F302R8T6。 启用的通道6，7，8也能正常工作。 现在通道3和15接一起，通道3测出0x03F正确。通道15测出0xFBD-0xFBE。 通道10现在没接信号,也没复用其他功能，浮空的，测出来是0x777-78A。 之前怀疑是高速通道和低速通道可能不一样，现在可以排除了。 ADC使用Cube配置，用户代码里面就开启DMA连续采集，没有改动。

hadc1.Init.NbrOfConversion = 10;看一下这里，我看你配置的是要采集11个AD值，这里写的是10个。

除了检查电源外，再确认下有无干扰问题。 我刚用F302测试10 11 15通道，结果很好，下面是3组数据。CH10接地，CH11悬空，CH15接VDDA. 我使用CubeMx进行配置的，没啥特别的。 static 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.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1; hadc1.Init.Resolution = ADC_RESOLUTION_12B; hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE; hadc1.Init.ContinuousConvMode = DISABLE; 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 = 3; hadc1.Init.DMAContinuousRequests = ENABLE; hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV; hadc1.Init.LowPowerAutoWait = DISABLE; hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; if (HAL_ADC_Init(&hadc1) != HAL_OK) { Error_Handler(); } /* Configure Regular Channel / sConfig.Channel = ADC_CHANNEL_10; sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SingleDiff = ADC_SINGLE_ENDED; sConfig.SamplingTime = ADC_SAMPLETIME_181CYCLES_5; sConfig.OffsetNumber = ADC_OFFSET_NONE; sConfig.Offset = 0; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } / Configure Regular Channel */ sConfig.Channel = ADC_CHANNEL_11; sConfig.Rank = ADC_REGULAR_RANK_2; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /* Configure Regular Channel / sConfig.Channel = ADC_CHANNEL_15; sConfig.Rank = ADC_REGULAR_RANK_3; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN ADC1_Init 2 / / USER CODE END ADC1_Init 2 / }

这个问题解决了吗？我使用STM32F302C8T6也遇到同样的问题。使用1,2,3,4,5,10,11,12，8个通道，其中1,2,3,4，这4个通道采样正常；5,10这2个通道采集值一直为0；11,12这2个通道采集值一直是4080左右。