stm32f407adc多通道dma采集

实现STM32F407的ADC多通道DMA采集需要以下步骤：

1. 配置ADC模块：首先需要配置ADC模块，设置ADC的采样时间、分辨率、转换模式等参数。

2. 配置DMA：开启DMA时钟，并配置DMA通道、数据传输方向、数据长度、传输完成中断等参数。

3. 配置NVIC中断：开启DMA中断，并设置优先级。

4. 启动ADC和DMA：使能ADC和DMA。

以下是一个示例代码，可以参考实现：

#include "stm32f4xx.h"

#define ADC1_DR_ADDRESS ((uint32_t)0x4001204C)

uint16_t adc_value[3];

void ADC_DMA_Init(void)
{
  ADC_InitTypeDef       ADC_InitStructure;
  DMA_InitTypeDef       DMA_InitStructure;
  GPIO_InitTypeDef      GPIO_InitStructure;
  NVIC_InitTypeDef      NVIC_InitStructure;

  /* ADC1, DMA2 and GPIOA clock enable */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  /* Configure ADC1 Channel7,8,9 pins as analog input -------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* DMA2 Stream0 channel0 configuration ----------------------------------------------*/
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&adc_value;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = 3;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);
  DMA_Cmd(DMA2_Stream0, ENABLE);

  /* ADC Common Init **********************************************************/
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);

  /* ADC1 Init ****************************************************************/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 3;
  ADC_Init(ADC1, &ADC_InitStructure);

  /* ADC1 regular channel7,8,9 configuration **************************************/
  ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 1, ADC_SampleTime_84Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 2, ADC_SampleTime_84Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 3, ADC_SampleTime_84Cycles);

  /* Enable DMA request after last transfer (Single-ADC mode) */
  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* Enable DMA Stream Half / Transfer Complete interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable DMA Stream Half / Transfer Complete interrupt */
  DMA_ITConfig(DMA2_Stream0, DMA_IT_TC | DMA_IT_HT, ENABLE);

  /* Start ADC1 Software Conversion */
  ADC_SoftwareStartConv(ADC1);
}

void DMA2_Stream0_IRQHandler(void)
{
  if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0)) {
    DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0);
    /* do something with the adc_value here */
  }

  if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_HTIF0)) {
    DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_HTIF0);
    /* do something with the adc_value here */
  }
}

int main(void)
{
  ADC_DMA_Init();

  while(1);
}

在这个示例中，我们使用了ADC1和DMA2，并采集了ADC1的7、8、9三个通道的数据。DMA2的Stream0被配置为循环模式，传输完成中断和半传输完成中断都被开启。当传输完成中断或半传输完成中断发生时，程序会调用DMA2_Stream0_IRQHandler函数进行处理。你可以根据自己的需求修改这个示例代码。