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#include "stm32f4_discovery.h"

int8_t podatki[16];

void delay();

void delay() {
	uint32_t d = 500;
  while(d--);
}



void initUSART1()
{
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); // USART naprava
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
  USART_InitTypeDef USART_InitStruct;
  USART_InitStruct.USART_BaudRate = 115200;
  USART_InitStruct.USART_WordLength = USART_WordLength_8b;
  USART_InitStruct.USART_StopBits = USART_StopBits_1;
  USART_InitStruct.USART_Parity = USART_Parity_No;
  USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
  USART_Init(USART1, &USART_InitStruct);
  USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
  USART_Cmd(USART1, ENABLE);
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  //nastavitve AF za pine
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);
}

void initDMA2()
{
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

  DMA_InitTypeDef DMA_InitStructure;
  DMA_InitStructure.DMA_Channel = DMA_Channel_4;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) podatki;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(USART1->DR);
  DMA_InitStructure.DMA_BufferSize = 16;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_Init(DMA2_Stream2, &DMA_InitStructure);

  DMA_Cmd(DMA2_Stream2, ENABLE);
}


int main(void)
{
  //lucke
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
  GPIO_InitTypeDef leds;
  leds.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  leds.GPIO_Mode = GPIO_Mode_OUT;
  leds.GPIO_OType = GPIO_OType_PP;
  leds.GPIO_PuPd = GPIO_PuPd_NOPULL;
  leds.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_Init(GPIOD, &leds);

  initUSART1();
  initDMA2();

  volatile int8_t x, y;

  while (1)
  {
	  x = 0;
	  for(int i = 0; i<16;i+2){
		  x += podatki[i];
	  }
	  x = x/8;

	  y = 0;
	  for(int i = 1; i<16;i+2){
		  y += podatki[i];
	  }
	  y = y/8;

    // x-axis leds
    if (x < -6) {
      // Vklopi ledico
      GPIO_SetBits(GPIOD, GPIO_Pin_12);
      delay();
      GPIO_ResetBits(GPIOD, GPIO_Pin_12);
    }

    if (x > 6) {
      GPIO_SetBits(GPIOD, GPIO_Pin_14);
      delay();
      GPIO_ResetBits(GPIOD, GPIO_Pin_14);
    }

    if (y < -6) {
      GPIO_SetBits(GPIOD, GPIO_Pin_13);
      delay();
      GPIO_ResetBits(GPIOD, GPIO_Pin_13);
    }

    if (y > 6) {
      GPIO_SetBits(GPIOD, GPIO_Pin_15);
      delay();
      GPIO_ResetBits(GPIOD, GPIO_Pin_15);
    }
  }
}