STM32 AD多通道循环采样后DMA保存数据

STM32 AD多通道循环采样后DMA保存数据：
描述：用ADC连续采集8路模拟信号，并由DMA传输到内存。ADC配置为扫描并且连续转换模式，ADC的时钟配置为12MHZ。在每次转换结束后，由DMA循环将转换的数据传输到内存中。



程序源码如下：
adc.c
#include "adc.h"

#define ADC1_DR_Address ((u32)0x4001244C)

vu16 ADCConvertedValue[256]; //采样数据保存

/* AD 采样的IO口配置 */
void RSTGPIOConfig(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //RES_DETECT4
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //CURRENT4
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //RES_DETECT1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //CURRENT1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //RES_DETECT2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //CURRENT2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //RES_DETECT3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //CURRENT3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* DMA1 channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address; //ADC地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADCConvertedValue; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;//方向(外设到内存)
DMA_InitStructure.DMA_BufferSize = 256;//传输内容大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址固定
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址固定
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据单位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//内存数据单位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA模式:循环传输
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //优先级高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //禁止内存到内存的传输
DMA_Init(DMA1_Channel1, &DMA_InitStructure);//配置DMA1的4通道

/* Enable DMA1 channel1 */
//DMA_Cmd(DMA1_Channel1, ENABLE); //CYL 这里是模式

/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //独立ADC模式
ADC_InitStructure.ADC_ScanConvMode = ENABLE; //禁止扫描方式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //开启连续转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;//不使用外部触发转换
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 8;//要转换的通道数目
ADC_Init(ADC1, &ADC_InitStructure);

RCC_ADCCLKConfig(RCC_PCLK2_Div6); //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_239Cycles5); //PB0 RES4
ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 2, ADC_SampleTime_239Cycles5); //PB1 CUR4
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 3, ADC_SampleTime_239Cycles5); //PC0 RES1 RES_DETECT1
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 4, ADC_SampleTime_239Cycles5); //PC1 CUR1 CURRENT1
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 5, ADC_SampleTime_239Cycles5); //PC2 RES2 RES_DETECT2
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 6, ADC_SampleTime_239Cycles5); //PC3 CUR2 CURRENT2
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 7, ADC_SampleTime_239Cycles5); //PC4 RES3
ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 8, ADC_SampleTime_239Cycles5); //PC5 CUR3

/* Enable the temperature sensor and vref internal channel */
ADC_TempSensorVrefintCmd(ENABLE);

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

ADC_ResetCalibration(ADC1);/* Enable ADC1 reset calibaration register */
while(ADC_GetResetCalibrationStatus(ADC1));/* Check the end of ADC1 reset calibration register */

ADC_StartCalibration(ADC1);//ADC校准
while(ADC_GetCalibrationStatus(ADC1));//等待校准完成

DMA_Cmd(DMA1_Channel1, ENABLE); /* Enable DMA1 channel1 */

ADC_SoftwareStartConvCmd(ADC1, ENABLE);//由于没有采用外部触发，所以使用软件触发ADC转换
}adc.h
#ifndef __ADC_H
#define __ADC_H

extern vu16 ADCConvertedValue[256];
void RSTGPIOConfig(void);
void ADC_Configuration(void);

#endif 应用程序可以通过如下函数读取到AD值：
static float ADC_RES_1(void) //PC0 RES1 RES_DETECT1 对应第3个数据
{
u8 i;
u32 nAdcData = 0;
float RES1 = 0;

for (i = 0; i < 32; i++)
{
nAdcData += ADCConvertedValue[i*8+2];
}
RES1 = (nAdcData/32.0)*825/1024.0; // 3300对应的是单片机3.3V 相当于3300/4096

return RES1;
}