/** @file sms/hardware.h
    Defines that let the SMS/GG hardware registers be accessed
    from C.
*/
#ifndef _HARDWARE_H
#define _HARDWARE_H

#include <types.h>

#define __BYTES extern UBYTE
#define __BYTE_REG extern volatile UBYTE

static volatile SFR AT(0x3E) MEMORY_CTL;

#define MEMCTL_JOYON   0b00000000
#define MEMCTL_JOYOFF  0b00000100
#define MEMCTL_BASEON  0b00000000
#define MEMCTL_BASEOFF 0b00001000
#define MEMCTL_RAMON   0b00000000
#define MEMCTL_RAMOFF  0b00010000
#define MEMCTL_CROMON  0b00000000
#define MEMCTL_CROMOFF 0b00100000
#define MEMCTL_ROMON   0b00000000
#define MEMCTL_ROMOFF  0b01000000
#define MEMCTL_EXTON   0b00000000
#define MEMCTL_EXTOFF  0b10000000

static volatile SFR AT(0x3F) JOY_CTL;

#define JOY_P1_LATCH   0b00000010
#define JOY_P2_LATCH   0b00001000

static volatile SFR AT(0x7E) VCOUNTER;

static volatile SFR AT(0x7F) PSG;

#define PSG_LATCH      0x80

#define PSG_CH0        0b00000000
#define PSG_CH1        0b00100000
#define PSG_CH2        0b01000000
#define PSG_CH3        0b01100000

#define PSG_VOLUME     0b00010000

static volatile SFR AT(0x7F) HCOUNTER;

static volatile SFR AT(0xBE) VDP_DATA;
static volatile SFR AT(0xBF) VDP_CMD;
static volatile SFR AT(0xBF) VDP_STATUS;

#define STATF_INT_VBL  0b10000000
#define STATF_9_SPR    0b01000000
#define STATF_SPR_COLL 0b00100000

#define VDP_REG_MASK   0b10000000
#define VDP_R0         0b10000000
extern UBYTE shadow_VDP_R0;

#define R0_VSCRL       0b00000000
#define R0_VSCRL_INH   0b10000000
#define R0_HSCRL       0b00000000
#define R0_HSCRL_INH   0b01000000
#define R0_NO_LCB      0b00000000
#define R0_LCB         0b00100000
#define R0_IE1_OFF     0b00000000
#define R0_IE1         0b00010000
#define R0_SS_OFF      0b00000000
#define R0_SS          0b00001000
#define R0_DEFAULT     0b00000110
#define R0_ES_OFF      0b00000000
#define R0_ES          0b00000001

#define VDP_R1         0b10000001
extern UBYTE shadow_VDP_R1;

#define R1_DEFAULT     0b10000000
#define R1_DISP_OFF    0b00000000
#define R1_DISP_ON     0b01000000
#define R1_IE_OFF      0b00000000
#define R1_IE          0b00100000
#define R1_SPR_8X8     0b00000000
#define R1_SPR_8X16    0b00000010

#define VDP_R2         0b10000010
extern UBYTE shadow_VDP_R2;

#define R2_MAP_0x3800  0xFF
#define R2_MAP_0x3000  0xFD
#define R2_MAP_0x2800  0xFB
#define R2_MAP_0x2000  0xF9
#define R2_MAP_0x1800  0xF7
#define R2_MAP_0x1000  0xF5
#define R2_MAP_0x0800  0xF3
#define R2_MAP_0x0000  0xF1

#define VDP_R3         0b10000011
extern UBYTE shadow_VDP_R3;
#define VDP_R4         0b10000100
extern UBYTE shadow_VDP_R4;
#define VDP_R5         0b10000101
extern UBYTE shadow_VDP_R5;

#define R5_SAT_0x3F00  0xFF
#define R5_SAT_MASK    0b10000001

#define VDP_R6         0b10000110
extern UBYTE shadow_VDP_R6;

#define R6_BANK0       0xFB
#define R6_DATA_0x0000 0xFB
#define R6_BANK1       0xFF
#define R6_DATA_0x2000 0xFF

#define VDP_R7         0b10000111
extern UBYTE shadow_VDP_R7;
#define VDP_RBORDER    0b10000111
extern UBYTE shadow_VDP_RBORDER;

#define R7_COLOR_MASK  0b11110000

#define VDP_R8         0b10001000
extern UBYTE shadow_VDP_R8;
#define VDP_RSCX       0b10001000
extern UBYTE shadow_VDP_RSCX;

#define VDP_R9         0b10001001
extern UBYTE shadow_VDP_R9;
#define VDP_RSCY       0b10001001
extern UBYTE shadow_VDP_RSCY;

#define VDP_R10        0b10001010
extern UBYTE shadow_VDP_R10;

#define R10_INT_OFF    0xFF
#define R10_INT_EVERY  0x00

static volatile SFR AT(0xDC) JOY_PORT1;

#define JOY_P1_UP      0b00000001
#define JOY_P1_DOWN    0b00000010
#define JOY_P1_LEFT    0b00000100
#define JOY_P1_RIGHT   0b00001000
#define JOY_P1_SW1     0b00010000
#define JOY_P1_TRIGGER 0b00010000
#define JOY_P1_SW2     0b00100000
#define JOY_P2_UP      0b01000000
#define JOY_P2_DOWN    0b10000000

static volatile SFR AT(0xDD) JOY_PORT2;

#define JOY_P2_LEFT    0b00000001
#define JOY_P2_RIGHT   0b00000010
#define JOY_P2_SW1     0b00000100
#define JOY_P2_TRIGGER 0b00000100
#define JOY_P2_SW2     0b00001000
#define JOY_RESET      0b00010000
#define JOY_P1_LIGHT   0b01000000
#define JOY_P2_LIGHT   0b10000000

static volatile SFR AT(0xF0) FMADDRESS;
static volatile SFR AT(0xF1) FMDATA;
static volatile SFR AT(0xF2) AUDIOCTRL;

static volatile UBYTE AT(0xfffc) RAM_CONTROL;

#define RAMCTL_BANK    0b00000100
#define RAMCTL_ROM     0b00000000
#define RAMCTL_RAM     0b00001000
#define RAMCTL_RO      0b00010000
#define RAMCTL_PROT    0b10000000

static volatile UBYTE AT(0xfff8) GLASSES_3D;

static volatile UBYTE AT(0xfffd) MAP_FRAME0;
static volatile UBYTE AT(0xfffe) MAP_FRAME1;
static volatile UBYTE AT(0xffff) MAP_FRAME2;

extern const UBYTE _BIOS;

extern const UBYTE _SYSTEM;

#define SYSTEM_PAL     0x00
#define SYSTEM_NTSC    0x01

extern volatile UBYTE VDP_ATTR_SHIFT;

#define VBK_TILES       0
#define VBK_ATTRIBUTES  1

#define VDP_SAT_TERM   0xD0

#if defined(__TARGET_sms)
#define DEVICE_SCREEN_X_OFFSET 0
#define DEVICE_SCREEN_Y_OFFSET 0
#define DEVICE_SCREEN_WIDTH 32
#define DEVICE_SCREEN_HEIGHT 24
#define DEVICE_SCREEN_BUFFER_WIDTH 32
#define DEVICE_SCREEN_BUFFER_HEIGHT 28
#define DEVICE_SCREEN_MAP_ENTRY_SIZE 2
#define DEVICE_SPRITE_PX_OFFSET_X 0
#define DEVICE_SPRITE_PX_OFFSET_Y -1
#define DEVICE_WINDOW_PX_OFFSET_X 0
#define DEVICE_WINDOW_PX_OFFSET_Y 0
#elif defined(__TARGET_gg)
#define DEVICE_SCREEN_X_OFFSET 6
#define DEVICE_SCREEN_Y_OFFSET 3
#define DEVICE_SCREEN_WIDTH 20
#define DEVICE_SCREEN_HEIGHT 18
#define DEVICE_SCREEN_BUFFER_WIDTH 32
#define DEVICE_SCREEN_BUFFER_HEIGHT 28
#define DEVICE_SCREEN_MAP_ENTRY_SIZE 2
#define DEVICE_SPRITE_PX_OFFSET_X 48
#define DEVICE_SPRITE_PX_OFFSET_Y 23
#define DEVICE_WINDOW_PX_OFFSET_X 0
#define DEVICE_WINDOW_PX_OFFSET_Y 0
#else
#error Unrecognized port
#endif
#define DEVICE_SCREEN_PX_WIDTH (DEVICE_SCREEN_WIDTH * 8)
#define DEVICE_SCREEN_PX_HEIGHT (DEVICE_SCREEN_HEIGHT * 8)

#endif
