#include "adc.h"

__IO uint16_t ADCConvertedValue[20]={0};



void ADC_init(void)
{
       

   ADC_InitTypeDef ADC_InitStructure;
       
  // GPIO_InitTypeDef GPIO_InitStructure;

   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE );          //使能ADC1通道时钟
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);        //使能DMA传输       

   RCC_ADCCLKConfig(RCC_PCLK2_Div6);   //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M


   DMA_init();

   /* ADC1 configuration ------------------------------------------------------*/
   ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
   ADC_InitStructure.ADC_ScanConvMode = DISABLE;//ENABLE;
   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
   ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
   ADC_InitStructure.ADC_NbrOfChannel = 1;
   ADC_Init(ADC1, &ADC_InitStructure);

   /* ADC1 regular channel16 configuration */
   ADC_RegularChannelConfig(ADC1, ADC_Channel_16, 1, ADC_SampleTime_239Cycles5);

   ADC_TempSensorVrefintCmd(ENABLE); //开启内部温度传感器，检测内部温度
   /* Enable ADC1 DMA */
   ADC_DMACmd(ADC1, ENABLE);

   /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* Enable ADC1 reset calibration register */   
   ADC_ResetCalibration(ADC1);
   /* Check the end of ADC1 reset calibration register */

    while(ADC_GetResetCalibrationStatus(ADC1));

   /* Start ADC1 calibration */
   ADC_StartCalibration(ADC1);
   /* Check the end of ADC1 calibration */
   while(ADC_GetCalibrationStatus(ADC1));

   /* Start ADC1 Software Conversion */
   ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

void DMA_init(void)
{

   DMA_InitTypeDef DMA_InitStructure;

   DMA_DeInit(DMA1_Channel1);
   DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;
   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
   DMA_InitStructure.DMA_BufferSize = 20;
   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
   DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
   DMA_Init(DMA1_Channel1, &DMA_InitStructure);

   /* Enable DMA1 channel1 */
   DMA_Cmd(DMA1_Channel1, ENABLE);
}


float Get_value(void)
{
          u8 i=0;
          u32 value_temp=0;
          double value=0;
          short temp_value=0;

          for(i=0;i<20;i++)
         {
          value_temp+=ADCConvertedValue[i];
         }
          value_temp= value_temp/20;
          value=(float)value_temp*(3.3/4096);
          value=(1.43-value)/0.0043+25;
          temp_value=value*100;
          return temp_value;
}