#include "InfoNES_Types.h"

#ifndef K6502_H_INCLUDED
#define K6502_H_INCLUDED

/* 6502 Flags */
#define FLAG_C 0x01
#define FLAG_Z 0x02
#define FLAG_I 0x04
#define FLAG_D 0x08
#define FLAG_B 0x10
#define FLAG_R 0x20
#define FLAG_V 0x40
#define FLAG_N 0x80

/* Stack Address */
#define BASE_STACK   0x100

/* Interrupt Vectors */
#define VECTOR_NMI   0xfffa
#define VECTOR_RESET 0xfffc
#define VECTOR_IRQ   0xfffe

// NMI Request
#define NMI_REQ  NMI_State = 0;

// IRQ Request
#define IRQ_REQ  IRQ_State = 0;

// Emulator Operation
void K6502_Init(void);
void K6502_Reset(void);
void K6502_Set_Int_Wiring( BYTE byNMI_Wiring, BYTE byIRQ_Wiring );
void K6502_Step( register WORD wClocks );

// I/O Operation (User definition)
static inline BYTE K6502_Read( WORD wAddr);
static inline WORD K6502_ReadW( WORD wAddr );
static inline WORD K6502_ReadW2( WORD wAddr );
static inline BYTE K6502_ReadZp( BYTE byAddr );
static inline WORD K6502_ReadZpW( BYTE byAddr );
static inline BYTE K6502_ReadAbsX(void);
static inline BYTE K6502_ReadAbsY(void);
static inline BYTE K6502_ReadIY(void);

static inline void K6502_Write( WORD wAddr, BYTE byData );
static inline void K6502_WriteW( WORD wAddr, WORD wData );

// The state of the IRQ pin
extern BYTE IRQ_State;

// The state of the NMI pin
extern BYTE NMI_State;

// The number of the clocks that it passed
extern WORD g_wPassedClocks;

#endif /* !K6502_H_INCLUDED */