#include "stm32f4xe.h"
#include "stm32f411xe.h"

volatile uint8_t button_pressed = 0;

static void delay(volatile uint32_t d) {
    while(d--) __asm("nop");
}

void GPIO_Init(void){

    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN |
                    RCC_AHB1ENR_GPIOBEN |
                    RCC_AHB1ENR_GPIOCEN;

    GPIOC->MODER &= ~(3 << (13*2));
    GPIOC->MODER |=  (1 << (13*2));   

    GPIOA->MODER &= ~(3 << (0*2));     
    GPIOA->PUPDR &= ~(3 << (0*2));
    GPIOA->PUPDR |=  (1 << (0*2));     
}

void EXTI0_Init(void)
{
    RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;

    SYSCFG->EXTICR[0] &= ~SYSCFG_EXTICR1_EXTI0; 

    EXTI->IMR  |= (1 << 0);   
    EXTI->FTSR |= (1 << 0);   
    EXTI->RTSR &= ~(1 << 0); 

    NVIC_SetPriority(EXTI0_IRQn, 1);
    NVIC_EnableIRQ(EXTI0_IRQn);
}

void TIM_Init(void){

    RCC->APB1ENR |= RCC_APB1ENR_TIM2EN |
                    RCC_APB1ENR_TIM3EN |
                    RCC_APB1ENR_TIM4EN;

    TIM2->PSC = 16000;   // 1 kHz
    TIM2->ARR = 500;     // 2 Hz (0.5s toggle)
    TIM2->DIER |= TIM_DIER_UIE;
    TIM2->CR1 |= TIM_CR1_CEN;

    NVIC_EnableIRQ(TIM2_IRQn);
}

void EXTI0_IRQHandler(void){
    if (EXTI->PR & (1 << 0)){
        delay(50000);          
        button_pressed = 1;   
        EXTI->PR |= (1 << 0);  
    }
}

void TIM2_IRQHandler(void){
    if (TIM2->SR & TIM_SR_UIF){
        TIM2->SR &= ~TIM_SR_UIF;
        GPIOC->ODR ^= (1 << 13);
    }
}

int main(void){

    GPIO_Init();
    EXTI0_Init();
    TIM_Init();

    while(1){
        if (button_pressed){        
            GPIOC->ODR ^= (1 << 13);
            delay(80000);
        }
    }
}
///////////////////////////////////////////////////////////////////////////////////////

#include "stm32f4xx.h"

void GPIO_Init(void)
{
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN | RCC_AHB1ENR_GPIOBEN;

    GPIOA->MODER &= ~(3U << (1 * 2));
    GPIOA->MODER |=  (1U << (1 * 2));   
    GPIOB->MODER &= ~(3U << (0 * 2));   
    GPIOB->PUPDR &= ~(3U << (0 * 2));
    GPIOB->PUPDR |=  (1U << (0 * 2));   
}

void Delay_ms(uint32_t ms)
{
    for(uint32_t i = 0; i < ms * 3000; i++)
    {
        __NOP();
    }
}

int main(void)
{
    GPIO_Init();

    while (1)
    {
        uint8_t button = GPIOB->IDR & (1 << 0);

        if (button == 0)  
        {
            GPIOA->ODR ^= (1 << 1);   
            Delay_ms(100);            
        }
        else
        {
            //LED pada kondisi terakhir. Kalo kondisi terakhirnya nyala berarti LEDnya bakal nyala 		terus
        }
    }
}