stm32使用DMA传输9路ADC

这里采集的是ADC1的ch0-ch8

只需要引用ADC_buf[10]这个数组就可以，ch0数据实时保存在ADC_buf[0]中，以此列推。

dma_adc.c

#include "dma_adc.h"

u16  ADC_buf[10];


 void ADC1_DMA_init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);

	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;	//通道引脚
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
	GPIO_Init(GPIOA,&GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;	//通道引脚
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
	GPIO_Init(GPIOB,&GPIO_InitStructure);
	
	DMA_InitTypeDef DMA_InitStructure;
	ADC_InitTypeDef	ADC_InitStructure;

	DMA_DeInit(DMA1_Channel1);
	
	DMA_InitStructure.DMA_PeripheralBaseAddr=ADC1_DR_Address;	//ADC数据寄存器地址
	DMA_InitStructure.DMA_MemoryBaseAddr=(u32)ADC_buf;	//将ADC1_DR_Address数据转移到ADC_buf
	DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC; //数据传输方向，外设作为数据源
	DMA_InitStructure.DMA_BufferSize=9; //传输个数据
	DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;//外设地址固定
	DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
	DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord; //表示每个传输的的数据大小
	DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;
	DMA_InitStructure.DMA_Mode=DMA_Mode_Circular; //循环传输
	DMA_InitStructure.DMA_Priority=DMA_Priority_High; //DMA通道优先级
	DMA_InitStructure.DMA_M2M=DMA_M2M_Disable; //禁止内存到内存传输
	DMA_Init(DMA1_Channel1,&DMA_InitStructure);
	
	DMA_Cmd(DMA1_Channel1,ENABLE);		//使能
	
	ADC_InitStructure.ADC_Mode=ADC_Mode_Independent; //独立模式
	ADC_InitStructure.ADC_ScanConvMode=ENABLE;	//扫描模式，用于多通道采集
	ADC_InitStructure.ADC_ContinuousConvMode=ENABLE; //开启连续转换
	ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None;//b不使用外部触发转换
	ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right;//采集数据右对齐
	ADC_InitStructure.ADC_NbrOfChannel=9;		//要转换的个数
	ADC_Init(ADC1,&ADC_InitStructure);
	
	RCC_ADCCLKConfig(RCC_PCLK2_Div6);	//6分频，12HZ
	
	//扫描顺序，55.5每个周期
	ADC_RegularChannelConfig(ADC1,ADC_Channel_0,1,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_1,2,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_2,3,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_3,4,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_4,5,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_5,6,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_6,7,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_7,8,ADC_SampleTime_239Cycles5);
	ADC_RegularChannelConfig(ADC1,ADC_Channel_8,9,ADC_SampleTime_239Cycles5);
	
	ADC_DMACmd(ADC1,ENABLE);	//向DMA发出请求
	
	ADC_Cmd(ADC1,ENABLE);
	
	ADC_ResetCalibration(ADC1);	//复位矫正寄存器
	
	while(ADC_GetResetCalibrationStatus(ADC1)); //等待矫正完成
	
	ADC_StartCalibration(ADC1);	//ADC矫正

	while(ADC_GetCalibrationStatus(ADC1));	//等待矫正完毕
	
	ADC_SoftwareStartConvCmd(ADC1,ENABLE);	//软件触发ADC转换

	
}

dma_adc.h

#ifndef _DMA_ADC_
#define _DMA_ADC_

#include "sys.h"

#define ADC1_DR_Address ((u32)0x40012400+0X4C)

extern u16  ADC_buf[10];

 void ADC1_DMA_init(void);

#endif