stm32四通道adc采样

#include “include.h“
__IO uint16_t AD_Value[N][M]={0}; //用来存放 ADC 转换结果，也是 DMA 的目标地址
float final[M]={0};//多次取平均之后的值
float temp[M]={0};//代入公式后的值
float all[M]={0};
float all_begin[M]={0};
int adc_flag=0;
int receive_flag=0;

void adc_Init（void）{
  GPIO_InitTypeDef 		  GPIO_InitStructure;
	ADC_CommonInitTypeDef ADC_CommonInitStructure;
	ADC_InitTypeDef       ADC_InitStructure;
	DMA_InitTypeDef 			DMA_InitStructure;
	
	RCC_AHB1PeriphClockCmd（RCC_AHB1Periph_GPIOAENABLE）;
	RCC_APB2PeriphClockCmd（RCC_APB2Periph_ADC1ENABLE）;
	RCC_AHB1PeriphClockCmd（RCC_AHB1Periph_DMA2ENABLE）;/*DMA2的时钟使能*/
	
	RCC_APB2PeriphResetCmd（RCC_APB2Periph_ADC1ENABLE）; //ADC1 复位
	RCC_APB2PeriphResetCmd（RCC_APB2Periph_ADC1DISABLE）; //复位结束
	
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4;
	GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_DOWN;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init（GPIOA&GPIO_InitStructure）;
	
	DMA_DeInit（DMA2_Stream0）;
	while（DMA_GetCmdStatus（DMA2_Stream0）!=DISABLE）;/*等待DMA可以配置*/
	DMA_InitStructure.DMA_Channel=DMA_Channel_0;
	DMA_InitStructure.DMA_PeripheralbaseAddr= （uint32_t）ADC1_base+0x4C;/*外设地址*/
	DMA_InitStructure.DMA_Memory0baseAddr=（u32）AD_Value;
	DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralToMemory;
	DMA_InitStructure.DMA_BufferSize=N*M;//数据传输的数量
	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=DISABLE;
	DMA_InitStructure.DMA_FIFOThreshold=DMA_FIFOThreshold_Full;
	DMA_InitStructure.DMA_MemoryBurst=DMA_MemoryBurst_Single;
	DMA_InitStructure.DMA_PeripheralBurst=DMA_PeripheralBurst_Single;
	DMA_Init（DMA2_Stream0&DMA_InitStructure）;
  DMA_Cmd（DMA2_Stream0ENABLE）;

	
	ADC_DeInit（）;//将外设 ADC1 的全部寄存器重设为缺省值
	ADC_CommonInitStructure.ADC_Mode=ADC_Mode_Independent;
	ADC_CommonInitStructure.ADC_Prescaler=ADC_Prescaler_Div4;
	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=ENABLE;
	ADC_InitStructure.ADC_ExternalTrigConvEdge=ADC_ExternalTrigConvEdge_None;
	ADC_InitStructure.ADC_NbrOfConversion=M;
	ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right;
	
	ADC_Init（ADC1&ADC_InitStructure）;

	ADC_RegularChannelConfig（ADC1ADC_Channel_11ADC_SampleTime_480Cycles）;//PA1  
	ADC_RegularChannelConfig（ADC1ADC_Channel_22ADC_SampleTime_480Cycles）;//PA2