基于stm32cubemx实现ADC采样信号通过多通道DMA输出，并给出代码主要部分

以下是基于stm32cubemx实现ADC采样信号通过多通道DMA输出的关键代码部分：

1. ADC初始化

ADC_HandleTypeDef hadc;
DMA_HandleTypeDef hdma_adc;

void MX_ADC_Init(void)
{
    ADC_ChannelConfTypeDef sConfig = {0};

    hadc.Instance = ADC1;
    hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
    hadc.Init.Resolution = ADC_RESOLUTION_12B;
    hadc.Init.ScanConvMode = ENABLE;
    hadc.Init.ContinuousConvMode = ENABLE;
    hadc.Init.DiscontinuousConvMode = DISABLE;
    hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
    hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
    hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    hadc.Init.NbrOfConversion = 3;
    if (HAL_ADC_Init(&hadc) != HAL_OK)
    {
        Error_Handler();
    }

    sConfig.Channel = ADC_CHANNEL_0;
    sConfig.Rank = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_84CYCLES;
    if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
    {
        Error_Handler();
    }

    sConfig.Channel = ADC_CHANNEL_1;
    sConfig.Rank = 2;
    if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
    {
        Error_Handler();
    }

    sConfig.Channel = ADC_CHANNEL_2;
    sConfig.Rank = 3;
    if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
    {
        Error_Handler();
    }
}

2. DMA初始化

void MX_DMA_Init(void)
{
    __HAL_RCC_DMA1_CLK_ENABLE();

    hdma_adc.Instance = DMA1_Channel1;
    hdma_adc.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_adc.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_adc.Init.MemInc = DMA_MINC_ENABLE;
    hdma_adc.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
    hdma_adc.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
    hdma_adc.Init.Mode = DMA_CIRCULAR;
    hdma_adc.Init.Priority = DMA_PRIORITY_HIGH;
    if (HAL_DMA_Init(&hdma_adc) != HAL_OK)
    {
        Error_Handler();
    }

    __HAL_LINKDMA(&hadc, DMA_Handle, hdma_adc);

    HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
}

3. DMA中断处理函数

void DMA1_Channel1_IRQHandler(void)
{
    HAL_DMA_IRQHandler(&hdma_adc);
}

4. DMA启动

HAL_ADC_Start_DMA(&hadc, (uint32_t*)adc_data, 3);

其中，adc_data为存储ADC采样结果的数组，3为采样通道数。

以上是基于stm32cubemx实现ADC采样信号通过多通道DMA输出的关键代码部分。