#include "main.h"
#include "stm32f4xx_adc.h"
#include "stm32f4xx_dma.h"

void Get_ADC_Optical(void);
float Adjust_ADC(u32 adc_val);
volatile u16 AD_Value[ADC_DMA_CHNNEL_SUM]; //用来存放ADC转换结果，也是DMA的目标地址

/**
 * @brief  adc dma 配置，无中断
 * @param
 * @retval None.
 */
void ADC_configuration(void)
{

  DMA_InitTypeDef DMA_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  ADC_InitTypeDef ADC_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1	, ENABLE );	  //使能ADC1通道时钟
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);//使能GPIOC时钟
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);//

  DMA_InitStructure.DMA_Channel = DMA_Channel_0;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (ADC1->DR);
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&AD_Value;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = 1; //与通道数设置一致
  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_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; // DMA_FIFOMode_Disable        DMA_FIFOMode_Enable
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);
  DMA_Cmd(DMA2_Stream0, ENABLE);

  GPIO_StructInit(&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; // ADC_DataAlign_Right  ADC_DataAlign_Left　　设置数据右对齐
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADC1, &ADC_InitStructure);

  //设置通道顺序，里面的设置数与ADC_InitStructure.ADC_NbrOfConversion = 3;对应
  ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_112Cycles);
  // ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 2, ADC_SampleTime_112Cycles);
  // ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 3, ADC_SampleTime_112Cycles);

  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; // ADC_DMAAccessMode_Disabled    ADC_DMAAccessMode_1
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;
  ADC_CommonInit(&ADC_CommonInitStructure);

  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); //单通道使用

  ADC_Cmd(ADC1, ENABLE);

  ADC_DMACmd(ADC1, ENABLE);

  ADC_SoftwareStartConv(ADC1);
}

/**
 * @brief  计算电池电压值
 * @param
 * @retval None.
 */
float Adjust_ADC(u32 adc_val)
{
  float Vout = 0.0;

  Vout = (STM32_ADC_REF / 0X0FFF) * adc_val;

  return Vout;
}