"Background Register Access"

Background related register definitions and bit defines. More...

Modules
	"Main Engine"
	Main Engine Background registers.
	"Sub Engine"
	Sub Engine Background registers.

Data Structures
struct	bg_attribute
	register overlay for background attribute registers More...
struct	bg_scroll
	register overlay for scroll registers More...
struct	bg_transform
	register overlay for affine matrix registers More...
struct	TileMapEntry16
	Overlay for 16-bit tile map entries. More...
struct	TileMapEntry8
	Overlay for 8-bit tile map entries. More...

Macros
#define	BG_BMP_BASE(base)   ((base) << MAP_BASE_SHIFT)
	Macro to set the graphics base in background control.
#define	BG_MAP_BASE(base)   ((base) << MAP_BASE_SHIFT)
	Macro to set the map base in background control.
#define	BG_PRIORITY(n)   (n)
	Macro to set the priority in background control.
#define	BG_TILE_BASE(base)   ((base) << TILE_BASE_SHIFT)
	Macro to set the tile base in background control.
#define	MAP_BASE_SHIFT   8
	The shift to apply to map base when storing it in a background control register.
#define	TILE_BASE_SHIFT   2
	The shift to apply to tile base when storing it in a background control register.
#define	TILE_FLIP_H   BIT(10)
	The horizontal flip bit for a 16 bit tile index.
#define	TILE_FLIP_V   BIT(11)
	The vertical flip bit for a 16 bit tile index.
#define	TILE_PALETTE(n)   ((n)<<12)
	Macro to set the palette entry of a 16 bit tile index.

Typedefs
typedef struct bg_attribute	bg_attribute
	register overlay for background attribute registers
typedef struct bg_scroll	bg_scroll
	register overlay for scroll registers
typedef struct bg_transform	bg_transform
	register overlay for affine matrix registers
typedef struct TileMapEntry16	TileMapEntry16
	Overlay for 16-bit tile map entries.
typedef struct TileMapEntry8	TileMapEntry8
	Overlay for 8-bit tile map entries.

Enumerations

Detailed Description

Background related register definitions and bit defines.

Enumeration Type Documentation

enum BackgroundControl

Bit defines for the background control registers.

Enumerator
BG_32x32	32 x 32 tile text background
BG_64x32	64 x 32 tile text background
BG_32x64	32 x 64 tile text background
BG_64x64	64 x 64 tile text background
BG_RS_16x16	16 x 16 tile affine (rotation & scale) background
BG_RS_32x32	32 x 32 tile affine (rotation & scale) background
BG_RS_64x64	64 x 64 tile affine (rotation & scale) background
BG_RS_128x128	128 x 128 tile affine (rotation & scale) background
BG_BMP8_128x128	128x128 pixel 8-bit bitmapped background
BG_BMP8_256x256	256x256 pixel 8-bit bitmapped background
BG_BMP8_512x256	512x256 pixel 8-bit bitmapped background
BG_BMP8_512x512	512 pixel 8-bit bitmapped background
BG_BMP8_1024x512	1024x512 pixel 8-bit Large bitmapped background (Mode 6 of main engine only)
BG_BMP8_512x1024	512x1024 pixel 8-bit Large bitmapped background (Mode 6 of main engine only)
BG_BMP16_128x128	128x128 pixel 16-bit bitmapped background
BG_BMP16_256x256	256x256 pixel 16-bit bitmapped background
BG_BMP16_512x256	512x256 pixel 16-bit bitmapped background
BG_BMP16_512x512	512x512 pixel 16-bit bitmapped background
BG_MOSAIC_ON	mosaic enable
BG_MOSAIC_OFF	mosaic disable
BG_PRIORITY_0	Lower priority will be rendered on top.
BG_PRIORITY_1	Lower priority will be rendered on top.
BG_PRIORITY_2	Lower priority will be rendered on top.
BG_PRIORITY_3	Lower priority will be rendered on top.
BG_WRAP_OFF	Disable wrapping (no effect on text backgrounds...always wrapped)
BG_WRAP_ON	Enable wrapping (no effect on text backgrounds...always wrapped)
BG_PALETTE_SLOT0	Use slot 0 of extended palettes.
BG_PALETTE_SLOT1	Use slot 1 of extended palettes.
BG_PALETTE_SLOT2	Use slot 2 of extended palettes.
BG_PALETTE_SLOT3	Use slot 3 of extended palettes.
BG_COLOR_256	256 color text background
BG_COLOR_16	16x16 color text background