F1_ADC+DMA采集三角波

adc.c

#include "adc.h"
#include "usart.h"
u8 flag=0;
volatile u16 AD_Value[500]={0};
 //volatile u16 AD_Value;
 
 
void ADCx_GPIO_Init()
{
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;    //模拟输入引脚
    GPIO_Init(GPIOA, &GPIO_InitStructure);

}


void ADCx_Base_Init()
{
    ADC_InitTypeDef ADC_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE); //使能ADC1时钟
    RCC_ADCCLKConfig(RCC_PCLK2_Div6);       //72M/6=12,ADC最大时间不能超过14M
    
    ADC_DeInit(ADC1);                                           //将外设 ADC1 的全部寄存器重设为缺省值
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;          //ADC工作模式:ADC1和ADC2工作在独立模式
    ADC_InitStructure.ADC_ScanConvMode =DISABLE;                //模数转换工作在扫描模式
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;          //模数转换工作在连续转换模式
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;     //外部触发转换关闭，使用软件触发
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;              //ADC数据右对齐
    ADC_InitStructure.ADC_NbrOfChannel = 1;                     //顺序进行规则转换的ADC通道的数目
    ADC_Init(ADC1, &ADC_InitStructure);                         //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器

    ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 1, ADC_SampleTime_239Cycles5 );//Tconv = 采样时间 + 12.5 个周期，239.5.5+12.5 = 252个周期，252*（1/12000 000）= 21us

    ADC_DMACmd(ADC1,ENABLE);
    ADC_Cmd(ADC1,ENABLE);
    
    ADC_ResetCalibration(ADC1); //复位校准
    while(ADC_GetResetCalibrationStatus(ADC1)); 
    ADC_StartCalibration(ADC1); //开始校准
    while(ADC_GetCalibrationStatus(ADC1)); 

    ADC_SoftwareStartConvCmd(ADC1,ENABLE); //软件触发开始转换
}


void ADCx_DMA_Init()
{
    NVIC_InitTypeDef NVIC_InitStructure;
    DMA_InitTypeDef DMA_InitStructure;
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA时钟
    
    DMA_DeInit(DMA1_Channel1);                                  //将DMA的通道1寄存器重设为缺省值
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;     //DMA外设ADC基地址
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)AD_Value;      //DMA内存基地址
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;          //内存作为数据传输的目的地
    DMA_InitStructure.DMA_BufferSize = 500;                     //DMA通道的DMA缓存的大小
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;         //内存地址寄存器递增
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;     //数据宽度为16位
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;     //数据宽度为16位
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;   //DMA_Mode_Normal工作在单次模式，只打10个  ；DMA_Mode_Circular，工作在循环缓存模式，不断连续多次打10个
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;         //DMA通道 x拥有高优先级
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;        //DMA通道x没有设置为内存到内存传输
    DMA_Init(DMA1_Channel1, &DMA_InitStructure);        //根据DMA_InitStruct中指定的参数初始化DMA的通道
    
    
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; //DMA1的通道1优先级配置
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);//开启传输完成中断
    DMA_Cmd(DMA1_Channel1,ENABLE); //DMA使能
}


void DMA1_Channel1_IRQHandler(void)
{
    
    if(DMA_GetFlagStatus(DMA1_FLAG_TC1)==SET)
    {
        printf("进入DMA发送中断！\r\n"); 
        flag=1;
        DMA_ClearFlag(DMA1_FLAG_TC1);//清中断标志，否则会一直中断

    }

}


void ADCx_All_Init()
{
    ADCx_GPIO_Init();
    ADCx_Base_Init();
    ADCx_DMA_Init();
}

adc.h

#ifndef _adc_H
#define _adc_H

#include "system.h"
extern u8 flag;
extern volatile u16 AD_Value[500];

void ADCx_All_Init(void);




#endif

main.c

#include "system.h"
#include "SysTick.h"
#include "led.h"
#include "usart.h"
#include "adc.h"
#include "zsign.h"


int main()
{
    int i=0;
    float ADC_Vol;
    SysTick_Init(72);
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  //中断优先级分组 分2组
    USART1_Init(9600);
    Sign_Init(100);
    ADCx_All_Init();
    
    printf("开始");
    while(1)
    {
        if(flag)
        {
            for(i=0;i<500;i++)
            {
                printf("- %d -",AD_Value[i]);
                ADC_Vol =(float) AD_Value[i]/4096*3.3;
                printf("=%.2f",ADC_Vol);
            }   
            i=0;
            flag=0;
        }
        
        
    }
}