nese/src/nes.h

#ifndef NES_H_
#define NES_H_

#include "apu.h"
#include "ppu.h"
#include "input.h"

#include "e6502/e6502.h"


#define nes_clock_master_num    (945U * 1000U * 1000U)
#define nes_clock_master_den    (44U)
#define nes_clock_cpu_div       (12U)
#define nes_clock_ppu_div       (4U)

#define nes_mem_ram_start   (0x0000U)
#define nes_mem_ram_size    (0x0800U)
#define nes_mem_ppu_start   (0x2000U)
#define nes_mem_ppu_size    (0x2000U)
#define nes_mem_apu_start   (0x4000U)
#define nes_mem_apu_size    (0x0020U)
#define nes_mem_exp_start   (0x4020U)
#define nes_mem_exp_size    (0x1FE0U)
#define nes_mem_wram_start  (0x6000U)
#define nes_mem_wram_size   (0x2000U)
#define nes_mem_rom_start   (0x8000U)
#define nes_mem_rom_size    (0x8000U)

#define nes_ppu_mem_size    (0x4000U)
#define nes_ppu_map_size    (0x8U)
#define nes_ppu_dma_reg     (0x4014U)

#define nes_input_1_reg     (0x4016U)
#define nes_input_2_reg     (0x4017U)
#define nes_input_set_reg   (0x4016U)

#define nes_apu_map_size    (0x20U)


typedef struct {
    // TODO: Dynamic size support
    uint8_t prg[nes_mem_rom_size];
    uint8_t chr[nes_ppu_mem_size];
} nes_cart_rom;

typedef enum {
    Cart_Flag_Vertical   = 0b0,
    Cart_Flag_Horizontal = 0b1,
} nes_Cart_Flags;

typedef struct {
    nes_cart_rom rom;
    uint8_t wram[nes_mem_wram_size];
    nes_Cart_Flags flags;
    int mapper;
} nes_cart;

typedef struct {
    e6502_Core cpu;
    nes_ppu ppu;
    nes_apu apu;
    nes_input input;
    uint8_t ram[nes_mem_ram_size];
    nes_cart cart;
} nes;

uint8_t nes_mem_read(nes*, uint16_t addr);

void nes_mem_write(nes*, uint16_t addr, uint8_t);

int nes_init(nes*);

void nes_reset(nes*);

nes_ppu_Result nes_run(nes*, int cycles, int* run);


#endif // NES_H_