STM32通过DMA采集多通道AD

#include "ad_driver.h"

//全局变量
//AD采样存放空间
__IO uint16_t ADCConvertedValue[20];

//函数
//初始化AD
void init_ad(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    //---------------------充电AD初始化--------------------
    //启动DMA时钟
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    //启动ADC1时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    //采样脚设置
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //DMA1通道1配置
    DMA_DeInit(DMA1_Channel1);
    //外设地址
    DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS;
    //内存地址
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADCConvertedValue;
    //dma传输方向单向
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    //设置DMA在传输时缓冲区的长度
    DMA_InitStructure.DMA_BufferSize = 20;
    //设置DMA的外设递增模式，一个外设
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    //设置DMA的内存递增模式
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    //外设数据字长
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    //内存数据字长
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    //设置DMA的传输模式：连续不断的循环模式
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    //设置DMA的优先级别
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    //设置DMA的2个memory中的变量互相访问
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    //使能通道1
    DMA_Cmd(DMA1_Channel1, ENABLE);

    //ADC1配置
    //独立工作模式
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    //扫描方式
    ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    //连续转换
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    //外部触发禁止
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    //数据右对齐
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    //用于转换的通道数
    ADC_InitStructure.ADC_NbrOfChannel = 2;
    ADC_Init(ADC1, &ADC_InitStructure);

    //规则模式通道配置
    ADC_RegularChannelConfig(ADC1, ADC_Channel_1 , 1, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_2 , 2, ADC_SampleTime_239Cycles5);

    //使能ADC1的DMA
    ADC_DMACmd(ADC1, ENABLE);

    //使能ADC1
    ADC_Cmd(ADC1, ENABLE);

    //使能ADC1复位校准寄存器
    ADC_ResetCalibration(ADC1);
    //检查校准寄存器是否复位完毕
    while(ADC_GetResetCalibrationStatus(ADC1));

    //开始校准
    ADC_StartCalibration(ADC1);
    //检测是否校准完毕
    while(ADC_GetCalibrationStatus(ADC1));

    //开启ADC1的软件转换
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

//获得充电电压
float voltage_charge(void)
{
    uint8_t i = 0;
    uint16_t sum = 0;
    float v = 0;

    //取得10次充电电压平均值
    for (i = 0;i < 10;i++)
    {
        sum += ADCConvertedValue[i * 2];
    }
    sum /= 10;
    //变换成电压值
    v = 0.002991 * sum;

    return v;
}

//获得放电电压
float voltage_discharge(void)
{
    uint8_t i = 0;
    uint16_t sum = 0;
    float v = 0;

    //取得10次充电电压平均值
    for (i = 0;i < 10;i++)
    {
        sum += ADCConvertedValue[i * 2 + 1];
    }
    sum /= 10;
    //变换成电压值
    v = 0.002991 * sum;

    return v;
}

【 转自：http://blog.csdn.net/jdh99/article/details/7815268】