/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  *            : main.c
  *            : Primer TIM i EXTI prekida na STM32F401RE
  ******************************************************************************
  */
#include "stm32f4xx_hal.h"

/* TIM handle deklaracije */
TIM_HandleTypeDef htim2;
TIM_HandleTypeDef htim3;

/* Funkcije za inicijalizaciju */
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(uint32_t PSC, uint32_t ARR);
static void MX_TIM3_Init(uint32_t PSC, uint32_t ARR);

/* Glavna funkcija */
int main(void)
{
    HAL_Init();
    SystemClock_Config();  // HSI 16 MHz
    MX_GPIO_Init();

    /* Inicijalizacija tajmera */
    MX_TIM2_Init(15999, 0);   // TIM2, 1 ms
    MX_TIM3_Init(15, 99);     // TIM3, 100 us

    /* Start tajmera sa interruptom */
    HAL_TIM_Base_Start_IT(&htim2);
    HAL_TIM_Base_Start_IT(&htim3);

    while (1)
    {
        // Glavna petlja prazna
    }
}

/* ----------------- GPIO Inicijalizacija ----------------- */
static void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    /* LED PC13 */
    __HAL_RCC_GPIOC_CLK_ENABLE();
    GPIO_InitStruct.Pin = GPIO_PIN_13;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    /* PA0 kao EXTI na RISING edge */
    __HAL_RCC_GPIOA_CLK_ENABLE();
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* PB1 kao EXTI na RISING i FALLING edge */
    __HAL_RCC_GPIOB_CLK_ENABLE();
    GPIO_InitStruct.Pin = GPIO_PIN_1;
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    /* NVIC konfiguracija za EXTI */
    HAL_NVIC_SetPriority(EXTI0_IRQn, 1, 0);
    HAL_NVIC_EnableIRQ(EXTI0_IRQn);

    HAL_NVIC_SetPriority(EXTI1_IRQn, 1, 0);
    HAL_NVIC_EnableIRQ(EXTI1_IRQn);
}

/* ----------------- TIM2 Inicijalizacija ----------------- */
static void MX_TIM2_Init(uint32_t PSC, uint32_t ARR)
{
    __HAL_RCC_TIM2_CLK_ENABLE();

    htim2.Instance = TIM2;
    htim2.Init.Prescaler = PSC;
    htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim2.Init.Period = ARR;
    htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
    HAL_TIM_Base_Init(&htim2);

    HAL_NVIC_SetPriority(TIM2_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(TIM2_IRQn);
}

/* ----------------- TIM3 Inicijalizacija ----------------- */
static void MX_TIM3_Init(uint32_t PSC, uint32_t ARR)
{
    __HAL_RCC_TIM3_CLK_ENABLE();

    htim3.Instance = TIM3;
    htim3.Init.Prescaler = PSC;
    htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim3.Init.Period = ARR;
    htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
    HAL_TIM_Base_Init(&htim3);

    HAL_NVIC_SetPriority(TIM3_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(TIM3_IRQn);
}

/* ----------------- Callback funkcije ----------------- */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
    if(GPIO_Pin == GPIO_PIN_0)
    {
        HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); // PA0 prekid → toggle LED
    }
    else if(GPIO_Pin == GPIO_PIN_1)
    {
        HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); // PB1 prekid → toggle LED
    }
}

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
    if(htim->Instance == TIM2)
    {
        HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); // TIM2 interupt → toggle LED
    }
    else if(htim->Instance == TIM3)
    {
        HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13); // TIM3 interupt → toggle LED
    }
}

/* ----------------- IRQ Handleri ----------------- */
void EXTI0_IRQHandler(void)
{
    HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
}

void EXTI1_IRQHandler(void)
{
    HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_1);
}

void TIM2_IRQHandler(void)
{
    HAL_TIM_IRQHandler(&htim2);
}

void TIM3_IRQHandler(void)
{
    HAL_TIM_IRQHandler(&htim3);
}

/* ----------------- System Clock ----------------- */
void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /* HSI 16 MHz */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    HAL_RCC_OscConfig(&RCC_OscInitStruct);

    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                  | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);
}