#include "stm32f4xx.h"
#include "stm32f4xx_hal.h"

static void GPIO_init(void);
static void SystemClock_Config(void);
static void Error_Handler(void);

int main(void)
{

////////////////////////////////////////////////////////////////////////////
//Libraries initialization - Инициализация библиотек
HAL_Init();
//GPIO initialization - Инициализация портов ввода/вывода
GPIO_init();
//Clock initialiaztion - Инициализация системы тактирования
SystemClock_Config();

long cnt = 0;


while(1)
{

if (cnt == 100) {cnt = 0;}
else {cnt = cnt + 1;}

if (cnt <= 50) HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_RESET);
else HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_SET);

/*
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_SET);
HAL_Delay(1000);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_RESET);
HAL_Delay(1000);
*/
}

}

static void GPIO_init(void)
{
///////////////////////////////////////////////////////////////////////////
GPIO_InitTypeDef GPIO_InitStruct;
/* Enable the GPIO_LED Clock */
__GPIOD_CLK_ENABLE();
/* Configure the GPIO_LED pin */
GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_15|GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;

HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_13, GPIO_PIN_SET);
//HAL_GPIO_WritePin(GPIOD, GPIO_PIN_13, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_RESET);
//HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET);
}

static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;

__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

////////////////////////////////////////////////////////////////////////////
//Set External High-speed oscillator type - Установка типа генератора - у нас имеется внешний кварц 8МГц
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;

RCC_OscInitStruct.HSEState = RCC_HSE_ON;

RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;

//SysClk = 8(HSE) / PLLM / RCC_PLLP_DIV2 * PLLN = 168 MHz
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 336;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;

RCC_OscInitStruct.PLL.PLLQ = 7;

if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}

////////////////////////////////////////////////////////////////////////////
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV4;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
Error_Handler();
}

HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

}

static void Error_Handler(void)
{
/* Turn LED5 on */
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12, GPIO_PIN_SET);
while(1)
{
}
}

void _exit(int i)
{
while (1);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_RESET);
}

if ((ticks - 1UL) > SysTick_LOAD_RELOAD_Msk)
  {
    return (1UL);                                                   /* Reload value impossible */
  }

  SysTick->LOAD  = (uint32_t)(ticks - 1UL);                         /* set reload register */
  NVIC_SetPriority (SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL); /* set Priority for Systick Interrupt */
  SysTick->VAL   = 0UL;                                             /* Load the SysTick Counter Value */
  SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk |
                   SysTick_CTRL_TICKINT_Msk   |
                   SysTick_CTRL_ENABLE_Msk;                         /* Enable SysTick IRQ and SysTick Timer */
  return (0UL);

void SysTick_Handler(void)
{
  HAL_IncTick();
}