/*----------------------------------------------------------------------------
Программа, которая измеряет напряжение и по DMA помещает данные в массив
АЦП запускается от таймера Т2 с частотой 1кГц. Размер массива -2000 слов.
Сначала генерируется прерывание обработчика первого полумассива, затем второго.


*---------------------------------------------------------------------------*/

#include <stm32f10x_adc.h>
#include <stm32f10x_dma.h>
#include <stm32f10x_gpio.h>
#include <stm32f10x_rcc.h>
#include <stm32f10x_tim.h>

#define ADC1_DR_Address    ((uint32_t)0x4001244C)

volatile uint16_t ADCConvertedValue[2000];    
uint16_t dmacounter;
uint16_t dmacounter2;



/*----------------------------------------------------------------------------
Настройки ADC-DMA
*---------------------------------------------------------------------------*/

void ADCDMA_Init(){
    
GPIO_InitTypeDef  GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure;    
NVIC_InitTypeDef NVIC_InitStructure;
    
    
/* Enable DMA1 clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable ADC1 and GPIOC clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC, ENABLE);    
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);    
    
/* Configure PC.04 (ADC Channel14) as analog input -------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);        
    
    
/* DMA1 channel1 configuration ----------------------------------------------*/
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 = 2000;
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_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);

// Включим прерывание от ДМА по окончанию передачи блока
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
DMA_ITConfig(DMA1_Channel1, DMA_IT_HT, ENABLE);
NVIC_EnableIRQ(DMA1_Channel1_IRQn);

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


/* TIM1 configuration ------------------------------------------------------*/

TIM_DeInit(TIM2);
/* Time Base configuration */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 0xBB;          
TIM_TimeBaseStructure.TIM_Prescaler = 64;      
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);  
TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);
TIM_GenerateEvent(TIM2, TIM_EventSource_CC2);

/* ADC1 configuration ------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel14 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_7Cycles5);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 external trigger */
ADC_ExternalTrigConvCmd(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));

/* TIM1 counter enable */
TIM_Cmd(TIM2, ENABLE);
    
}    


/*----------------------------------------------------------------------------
  Обработчик прерывания от DMA - АЦП по окончании передачи блока
*---------------------------------------------------------------------------*/

void DMA1_Channel1_IRQHandler(void){    

    if (DMA_GetITStatus(DMA1_IT_HT1))    {
        dmacounter++;
        DMA_ClearITPendingBit(DMA1_IT_HT1);    
    }
    if (DMA_GetITStatus(DMA1_IT_TC1))    {
        dmacounter2++;
        DMA_ClearITPendingBit(DMA1_IT_TC1);    
    }        

}

/*----------------------------------------------------------------------------
  Обработчик прерывания от события Timer2 CC2
*---------------------------------------------------------------------------*/
void TIM2_IRQHandler(void){

    if (TIM_GetITStatus(TIM2, TIM_IT_CC2) != RESET) {  

         TIM_ClearITPendingBit(TIM2, TIM_IT_CC2);
    }    
}