多通道的DMA配置怎么写，库函数

以下是使用库函数进行多通道DMA配置的示例代码：

#include "stm32f10x.h"

#define ADC1_DR_Address    ((uint32_t)0x4001244C)

#define ADC1_DR_DMA_STREAM          DMA1_Stream0
#define ADC1_DR_DMA_CHANNEL         DMA_Channel_0
#define ADC1_DR_DMA_IRQ             DMA1_Stream0_IRQn

#define ADC1_DR_DMA_BUFFERSIZE      4

__IO uint16_t ADC1_DR_DMA_Buffer[ADC1_DR_DMA_BUFFERSIZE];

void ADC_DMA_Init(void)
{
  DMA_InitTypeDef DMA_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

  DMA_InitStructure.DMA_Channel = ADC1_DR_DMA_CHANNEL;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADC1_DR_DMA_Buffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = ADC1_DR_DMA_BUFFERSIZE;
  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(ADC1_DR_DMA_STREAM, &DMA_InitStructure);

  DMA_Cmd(ADC1_DR_DMA_STREAM, ENABLE);

  DMA_ITConfig(ADC1_DR_DMA_STREAM, DMA_IT_TC, ENABLE);

  NVIC_InitTypeDef NVIC_InitStructure;

  NVIC_InitStructure.NVIC_IRQChannel = ADC1_DR_DMA_IRQ;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void ADC_Configuration(void)
{
  ADC_InitTypeDef ADC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  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);

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 4;
  ADC_Init(ADC1, &ADC_InitStructure);

  ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_3Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_3Cycles);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_3Cycles);

  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
  ADC_DMACmd(ADC1, ENABLE);

  ADC_Cmd(ADC1, ENABLE);

  ADC_SoftwareStartConv(ADC1);
}

void DMA1_Stream0_IRQHandler(void)
{
  if (DMA_GetITStatus(DMA2_Stream0, DMA_IT_TCIF0) != RESET)
  {
    for (int i = 0; i < ADC1_DR_DMA_BUFFERSIZE; i++)
    {
      printf("Channel %d: %d\n", i, ADC1_DR_DMA_Buffer[i]);
    }
    DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0);
  }
}

int main(void)
{
  ADC_Configuration();
  ADC_DMA_Init();

  while (1)
  {
  }
}

这里使用了 STM32F10x 标准库函数进行配置，使用了多通道扫描模式，ADC1 通道0-3 被采样，并使用 DMA 传输到 ADC1_DR_DMA_Buffer 中。DMA 传输使用了循环模式，传输完成后触发中断，在中断处理函数中读取采样数据并清除中断标志位。