// SPDX-License-Identifier: MIT
//
// Copyright (c) 2020 Antonio Niño Díaz

#ifndef INTERRUPTS_H__
#define INTERRUPTS_H__

#include <stddef.h>
#include <stdint.h>

#include "definitions.h"

typedef enum {
  IRQ_VBLANK = 0,
  IRQ_HBLANK = 1,
  IRQ_VCOUNT = 2,
  IRQ_TIMER0 = 3,
  IRQ_TIMER1 = 4,
  IRQ_TIMER2 = 5,
  IRQ_TIMER3 = 6,
  IRQ_SERIAL = 7,
  IRQ_DMA0 = 8,
  IRQ_DMA1 = 9,
  IRQ_DMA2 = 10,
  IRQ_DMA3 = 11,
  IRQ_KEYPAD = 12,
  IRQ_GAMEPAK = 13,
  IRQ_NUMBER
} irq_index;

typedef void (*irq_vector)(void);

// Initialize global interrupt handling. This is called before reaching
// GBA_main(), so it isn't normally needed to call it.
EXPORT_API void IRQ_Init(void);

// Set interrupt handler for the specified interrupt.
EXPORT_API void IRQ_SetHandler(irq_index index, irq_vector function);

// Enable the specified interrupt. For VBLANK, HBLANK and VCOUNT, this function
// also sets the corresponding flags in DISPSTAT automatically.
EXPORT_API void IRQ_Enable(irq_index index);

// Disable the specified interrupt.
EXPORT_API void IRQ_Disable(irq_index index);

// Set the reference VCOUNT that triggers the VCOUNT interrupt.
EXPORT_API void IRQ_SetReferenceVCOUNT(uint32_t y);

#endif  // INTERRUPTS_H__