/**
  ******************************************************************************
  * @file    Project/adc/adc.c 
  * @author  X9D Application Team
  * @Hardware version V0.2
  * @date    11-July-2012
  * @brief   This file provides adc Init and drivers.
  * *
  ******************************************************************************
*/
#include "stm32f2xx.h"
#include "adc.h"
#include "hal.h"
#include "msg_que.h"
#include "stdio.h"
#include "stdlib.h"
#include "item.h"



#define ADC1_DR_ADDRESS    ((uint32_t)0x4001204C) 
//#define ADC2_DR_ADDRESS    ((uint32_t)0x4001214C)
//#define ADC3_DR_ADDRESS    ((uint32_t)0x4001224C)

__IO uint16_t ADC1ConvertedValue[10] = {0};


void adc_clk_init()
{
  /* Enable peripheral clocks *************************************************/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOADC, ENABLE); 
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
}



void adc_gpio_init()
{
  GPIO_InitTypeDef      GPIO_InitStructure;
//AIN state
  /* Configure ADC1 Channel5 pin as analog input ******************************/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

}
void adc_init() //one adc
{
    ADC_InitTypeDef ADC_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    DMA_InitTypeDef DMA_InitStructure;
    
    adc_clk_init();//enable
    adc_gpio_init();//AIN
  
    /* ADC1 regular channel configuration ************************************/
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_10b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;  //
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; //
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;//
    ADC_Init(ADC1, &ADC_InitStructure);
    
    /* ADC Common configuration **********************  ***************************/
    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//one ADC
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_6Cycles;//6* 1/30M 
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;//
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; //60M/2
    ADC_CommonInit(&ADC_CommonInitStructure);  
    
    /* ADC1 regular channel configuration */ 
    ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 1, ADC_SampleTime_3Cycles);//
    
    
    /* DMA2 Stream0 channel0 configuration **************************************/
    DMA_InitStructure.DMA_Channel = DMA_Channel_0;  
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADC1ConvertedValue;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize = 1;
    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_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
    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);
    
    /* Enable DMA request after last transfer (Single-ADC mode) */
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

    /* Enable ADC1 DMA */
    ADC_DMACmd(ADC1, ENABLE);

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

}