#ifndef STM32U5_HAL_EXTI_HPP
#define STM32U5_HAL_EXTI_HPP

#include "global_variable.h"
#include "prepherials.h"

#include "reg_exti_gen.h"

class Exti {
public:
    EXTI_TypeDef *ins;
    reg_exti_t *reg;
    void (*callback)() = nullptr;
public:
    Exti() = default;

    void setup() {
        // enable clock
        RCC->APB3ENR |= RCC_APB3ENR_SYSCFGEN;
        // enable interrupt
        NVIC_EnableIRQ(EXTI0_IRQn);
        reg = (reg_exti_t *) EXTI;
        ins = (EXTI_TypeDef *) EXTI;
    }

    void init(int line, int mode, int trigger) {
        // set mode
    }

    // falling edge or rising edge
    void set_trigger(int line, int trigger, void(*_callback)()) {
        NVIC_EnableIRQ(EXTI2_IRQn);
        reg->ftsr1.ft2 = 1;
        reg->imr1.im2 = 1;
        reg->r1.exti16_23 = 1; // pb 1 as interrupt
        callback = _callback;
    }

    void interrupt() {
        uint32_t tmp = ins->FPR1;
        reg->fpr1.fpif2 = 1;
        if (callback != nullptr) callback();
    }
};

#endif