#define DMA_STREAM DMA2_Stream1
#define DMA_CHANNEL    DMA_Channel_7
#define BUFFER_SIZE    127

void dma_init(void)
{

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);    
    

  /* GPIOA and GPIOD clock enable */
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);  

  /* GPIO Configuration ------------------------------------------------------*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_3
                                | GPIO_Pin_4 | GPIO_Pin_5
                              | GPIO_Pin_6 | GPIO_Pin_7
                              | GPIO_Pin_8 | GPIO_Pin_9
                              | GPIO_Pin_10;    
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_InitStructure);


    DMA_Cmd(DMA_STREAM, DISABLE);
    DMA_DeInit(DMA_STREAM);

  /* DMA Channel5 Configuration ----------------------------------------------*/
  /* Configure DMA Stream      */
  DMA_InitStructure.DMA_Channel = DMA_CHANNEL;  
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&GPIOB->IDR;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) Parallel_Data_Buffer[0];
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = (uint32_t)BUFFER_SIZE;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //  DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;        
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA_STREAM, &DMA_InitStructure);                      
    
  /* Enable DMA Stream Transfer Complete interrupt      */
  DMA_ITConfig(DMA_STREAM, DMA_IT_TC, ENABLE);           

  /* DMA Stream enable          */
  DMA_Cmd(DMA_STREAM, ENABLE);     

}

//------------------------------------------------------------
void TIM8_UP_TIM13_IRQHandler(void)
{
    if(TIM_GetITStatus(TIM8,TIM_IT_Update)!=RESET)
    {
        TIM8->SR = (uint16_t)~TIM_IT_Update;
    }
    GPIOA->BSRRH = GPIO_Pin_2; //  Тактируем АЦП
    __NOP();
    GPIOA->BSRRL = GPIO_Pin_2;

//Parallel_Data_Buffer[i] = GPIOB->IDR;
    
if(i < 127)    i++;
else i = 0;
}

#include "stm32f2xx.h"



int main(void)
{

/* System Clocks Configuration ---------------------------------------------*/
/* Enable TIM3 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

/* Enable DMA clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);

/* GPIOA and GPIOD clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB
| RCC_AHB1Periph_GPIOC, ENABLE);

/* GPIO Configuration ------------------------------------------------------*/
GPIO_Configuration();

/* DMA Channel6 Configuration ----------------------------------------------*/
DMA_InitStructure.DMA_Channel = DMA_Channel_5;

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&GPIOB->IDR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) Parallel_Data_Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;

DMA_InitStructure.DMA_BufferSize = 512;
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_VeryHigh;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA1_Stream4, &DMA_InitStructure);

/* Enable DMA Channel5 */
DMA_Cmd(DMA1_Stream4, ENABLE);


/* TIM3 Configuration ------------------------------------------------------*/

/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 256;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* Input Capture Mode configuration: Channel1 */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = 0;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM3, &TIM_ICInitStructure);

/* Enable TIM3 DMA */
TIM_DMACmd(TIM3, TIM_DMA_CC1, ENABLE);

/* Enable TIM3 counter */
TIM_Cmd(TIM3, ENABLE);


while (1)
{
/* Trigger TIM3 IC event => DMA request by toggling PA.02 */
GPIO_ResetBits(GPIOA, GPIO_Pin_2);
GPIO_SetBits(GPIOA, GPIO_Pin_2);
}
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Enable GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and AFIO clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB
| RCC_AHB1Periph_GPIOC, ENABLE);

/* GPIOA Configuration: PA2 GPIO Output -> TIM3 Channel1 in Input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);


GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_3
| GPIO_Pin_4 | GPIO_Pin_5
| GPIO_Pin_6 | GPIO_Pin_7
| GPIO_Pin_8 | GPIO_Pin_9
| GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}

#define DMA_STREAM DMA2_Stream5


#define DMA_CHANNEL DMA_Channel_6
#define BUFFER_SIZE 127
void dma_init(void)
{

/* System Clocks Configuration ---------------------------------------------*/

/* GPIOA and GPIOD clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

/* GPIO Configuration ------------------------------------------------------*/
// GPIO_Configuration();
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_3
| GPIO_Pin_4 | GPIO_Pin_5
| GPIO_Pin_6 | GPIO_Pin_7
| GPIO_Pin_8 | GPIO_Pin_9
| GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);



/* Enable DMA clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

DMA_STREAM->PAR = (uint32_t)&GPIOB->IDR;

DMA_STREAM->M0AR = (uint32_t)& Parallel_Data_Buffer[0];

DMA_STREAM->NDTR = (uint32_t)BUFFER_SIZE;

DMA_STREAM->CR = 0x00;

DMA_STREAM->CR |= DMA_Channel_6;

DMA_STREAM->CR |= DMA_SxCR_PL_1; //high

DMA_STREAM->FCR &=~(DMA_SxFCR_FTH | DMA_SxFCR_DMDIS);
DMA_STREAM->FCR &=~ DMA_SxFCR_DMDIS;//Direct mode enable

DMA_STREAM->CR |= DMA_DIR_PeripheralToMemory; //memory to memory

DMA_STREAM->CR &=~ DMA_SxCR_PINC;//nie inkrementuje

DMA_STREAM->CR |= DMA_SxCR_MINC;//inkrementuje

DMA_STREAM->CR |= DMA_SxCR_PSIZE_0;//Half Word (16 bitow)

DMA_STREAM->CR |= DMA_SxCR_MSIZE_0;//half Word (16 bity)
//Tryb:
DMA_STREAM->CR |= DMA_SxCR_CIRC;//Circular mode


DMA_STREAM->CR &=~(DMA_SxCR_PBURST_1 | DMA_SxCR_PBURST_0);//single
DMA_STREAM->CR &=~(DMA_SxCR_MBURST_1 | DMA_SxCR_MBURST_0);//single

DMA_STREAM->CR |= DMA_SxCR_EN;
while(!(DMA_STREAM->CR & DMA_SxCR_EN));
} void tim_init(void)
{
//======================== Timer ================================================
/* TIM1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);

TIM1->PSC = 100;

TIM1->ARR = 6000;

TIM1->CR1 |= TIM_CR1_ARPE //bit 7, Auto reload preload enable
| TIM_CR1_URS //Update request source
| TIM_CR1_CEN; // bit 0, counter enable

TIM1->DIER |= TIM_DIER_UDE
| TIM_DIER_UIE;//Update DMA request enable
}