stm32f103r6 ADC参考电源为5V，利用ADC对3个通道PA1、PA2和PA3进行连续扫描采样，并通过串口打印三个通道上的模拟电压值。提交keil主函数 ，ADC.c和DMA.c

主函数：

#include "stm32f10x.h"
#include "stdio.h"
#include "ADC.h"
#include "DMA.h"

void USART1_Config(void);

int main(void)
{
    uint16_t ADC_Value[3];
    float Voltage[3];

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    USART1_Config();
    ADC_DMA_Config();

    while (1)
    {
        ADC_Value[0] = ADC_GetConversionValue(ADC1);
        ADC_Value[1] = ADC_GetConversionValue(ADC1);
        ADC_Value[2] = ADC_GetConversionValue(ADC1);

        Voltage[0] = (float)(ADC_Value[0] * 5.0 / 4096.0);
        Voltage[1] = (float)(ADC_Value[1] * 5.0 / 4096.0);
        Voltage[2] = (float)(ADC_Value[2] * 5.0 / 4096.0);

        printf("PA1:%.2fV  PA2:%.2fV  PA3:%.2fV\r\n", Voltage[0], Voltage[1], Voltage[2]);
        Delay_ms(1000);
    }
}

void USART1_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

void Delay_ms(unsigned int n)
{
    unsigned int i, j;
    for (i = 0; i < n; i++)
        for (j = 0; j < 1000; j++);
}

ADC.c：

#include "stm32f10x.h"
#include "ADC.h"

void ADC_DMA_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_InitTypeDef ADC_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    DMA_DeInit(DMA1_Channel1);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_Value;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = 3;
    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_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    DMA_Cmd(DMA1_Channel1, ENABLE);

    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_InitStructure.ADC_ScanConvMode = ENABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfChannel = 3;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_239Cycles5);
    ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_239Cycles5);

    ADC_DMACmd(ADC1, ENABLE);

    ADC_Cmd(ADC1, ENABLE);
    ADC_ResetCalibration(ADC1);
    while(ADC_GetResetCalibrationStatus(ADC1));

    ADC_StartCalibration(ADC1);
    while(ADC_GetCalibrationStatus(ADC1));

    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

DMA.c:

#include "stm32f10x.h"
#include "DMA.h"

void DMA1_Channel1_IRQHandler(void)
{
    if (DMA_GetITStatus(DMA1_IT_TC1) != RESET)
    {
        DMA_ClearITPendingBit(DMA1_IT_TC1);
    }
}