/*
 * =====================================================================================
 *
 *       Filename:  cpu.h
 *
 *    Description:  6502 CPU emulator headers 
 *
 *        Version:  1.0
 *        Created:  2023-09-21 10:12:33 PM
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  William Nolin, 
 *   Organization:  
 *
 * =====================================================================================
 */

#ifndef EMU_CPU_H
#define EMU_CPU_H

// Reference: https://www.nesdev.org/wiki/Status_flags
#define CPU_STATUS_CARRY_MASK = 0x01;
#define CPU_STATUS_ZERO_MASK = 0x02;
#define CPU_STATUS_INTERRUPT_DISABLE_MASK = 0x04;
#define CPU_STATUS_DECIMAL_MASK = 0x08;
#define CPU_STATUS_B_MASK = 0x10;
#define CPU_STATUS_I_MASK = 0x20;
#define CPU_STATUS_OVERFLOW_MASK = 0x40;
#define CPU_STATUS_NEGATIVE_MASK = 0x80;

// Reference: https://www.nesdev.org/obelisk-6502-guide/registers.html
typedef struct {
    unsigned short program_counter;
    unsigned char stack_pointer;
    unsigned char accumulator;
    unsigned char x;
    unsigned char y;
    unsigned char status;
} cpu_registers_t;

/**
 * @brief Set clock
 */
void cpu_step_to(int cycle);

void cpu_add_cycles(int count);

cpu_registers_t* cpu_get_registers();

#endif