#include "adc.h"
#include "delay.h"
#include "system_stm32f4xx.h"
#include "lcd.h"


#define ADC1_DR_Address    ((u32)0x40012400+0x4c)


uint16_t AD_Value[4]={0,0,0,0};

uint32_t adc1;
uint32_t adc2;
uint32_t adc3;
uint32_t adc4;



void adc_dma_init(void)
{
        ADC_InitTypeDef       ADC_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        DMA_InitTypeDef       DMA_InitStructure;
        GPIO_InitTypeDef      GPIO_InitStructure;
       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
       
        ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式
        ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;//预分频为2分频
        ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;  //dma不失能
        ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//两个采样阶段之间延迟5个时钟
        ADC_CommonInit(&ADC_CommonInitStructure);
       
        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位模式
        ADC_InitStructure.ADC_ScanConvMode = ENABLE;  //扫描模式开，这个很重要，我以前一直错在这个地方
        ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;  //开启连续装换
        ADC_InitStructure.ADC_ExternalTrigConvEdge =  ADC_ExternalTrigConvEdge_None; //使用软件触发
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //右对齐
        ADC_InitStructure.ADC_NbrOfConversion = 4;//四个通道的使用
        //ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; /* 外部触发源 定时器1的PWM输出通道1 */
       
        ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_15Cycles);
        ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_15Cycles);
        ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_15Cycles);
        ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 4, ADC_SampleTime_15Cycles);
       
        ADC_Init(ADC1, &ADC_InitStructure);
       
       
        DMA_InitStructure.DMA_Channel = DMA_Channel_0; //dma 通道0
        DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;//外设地址
        DMA_InitStructure.DMA_Memory0BaseAddr = (uint16_t)&AD_Value;  //记忆地址
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;  //从外设到记忆
        DMA_InitStructure.DMA_BufferSize = 4;  //四个通道传输
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设不递增
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//记忆逐个递增
        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//外设格式
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //记忆格式
        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  //循环模式
  DMA_InitStructure.DMA_Priority = DMA_Priority_High; //高优先级
        DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //fifio模式不开
        DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;//fiio模式为全模式
        DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;   //记忆单次突发传输
        DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;  //外设单次突发传输
       
        DMA_DeInit(DMA2_Stream0 );//数据流配置0  ************
        DMA_Init(DMA2_Stream0, &DMA_InitStructure);  
               
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
        GPIO_Init(GPIOA, &GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
         

        //ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);//没有这个函数，无法获得新的状态
        ADC_DMACmd(ADC1, ENABLE);
       
        DMA_Cmd(DMA2_Stream0, ENABLE);
        ADC_Cmd(ADC1, ENABLE);

        ADC_SoftwareStartConv(ADC1);
        adc1=ADC_GetConversionValue(ADC1);
        LCD_ShowxNum(60,100, AD_Value[0],6,16,0);
        LCD_ShowxNum(30,120, AD_Value[1],6,16,0);
        LCD_ShowxNum(90,120, AD_Value[2],6,16,0);
        LCD_ShowxNum(120,150, AD_Value[3],6,16,0);
        LCD_ShowxNum(140,180, adc1,6,16,0);
       
}

void kaiqi(void)
{
       
ADC_SoftwareStartConv(ADC1);
adc1=ADC_GetConversionValue(ADC1);
DMA_Cmd(DMA2_Stream0, DISABLE);
ADC_DMACmd(ADC1, DISABLE);       
}

int mian（）
{
adc_dma_init();

kaiqi();
while（1）；
}