Low-level access to the 7up video chips. More...

Enumerations
enum	sup_low_mapsize { SUP_LOW_MAP_32X32 = 0, SUP_LOW_MAP_64X32 = 1, SUP_LOW_MAP_128X32 = 2, SUP_LOW_MAP_32X64 = 4, SUP_LOW_MAP_64X64 = 5, SUP_LOW_MAP_128X64 = 7 }
	Map sizes for the backgrounds. More...
Functions
void	eris_low_sup_init (int chip)
	Initialize a 7up.
void	eris_low_sup_set_video_mode (int chip, int hdispstrt, int hsyncwid, int hdispend, int hdispwid, int vdispstrt, int vsyncwid, int vdispwid, int vdispend)
	Setup a 7up's video mode.
void	eris_low_sup_set_vram_write (int chip, u16 addr)
	Set the VRAM write address for a 7up chip.
void	eris_low_sup_vram_write (int chip, u16 data)
	Write to VRAM on a 7up chip.
void	eris_low_sup_set_vram_read (int chip, u16 addr)
	Set the VRAM read address for a 7up chip.
u16	eris_low_sup_vram_read (int chip)
	Read from VRAM from a 7up chip.
void	eris_low_sup_set_control (int chip, int increment, int bg_show, int spr_show)
	Set controls for a 7up chip.
void	eris_low_sup_set_interrupts (int chip, int vblank_irq, int raster_irq, int excess_spr, int spr_collision)
	Set interrupt information for a 7up chip.
void	eris_low_sup_set_interrupt_raster (int chip, int raster)
	Set the raster to generate an IRQ from.
void	eris_low_sup_set_scroll (int chip, u16 x, u16 y)
	Scroll a 7up background.
void	eris_low_sup_do_dma (int chip, u16 src, u16 dst, u16 len)
	Perform a 7up DMA.
void	eris_low_sup_setup_dma (int chip, int satb_repeat, int src_dec, int dst_dec, int vram_irq, int satb_irq)
	Setup the DMA on a 7up.
void	eris_low_sup_set_satb_address (int chip, u16 addr)
	Sets the Sprite Attribute Table Block address.
void	eris_low_sup_set_access_width (int chip, int cg_mode, sup_low_mapsize mapsize, int spr_px_w, int vram_px_w)
	Set access width information.

Detailed Description

Low-level access to the 7up video chips.

Enumeration Type Documentation

enum sup_low_mapsize

Map sizes for the backgrounds.

Enumerator:

SUP_LOW_MAP_32X32	32x32 tile map. (256x256 pixel)
SUP_LOW_MAP_64X32	64x32 tile map. (512x256 pixel)
SUP_LOW_MAP_128X32	128x32 tile map. (1024x256 pixel)
SUP_LOW_MAP_32X64	32x64 tile map. (256x512 pixel)
SUP_LOW_MAP_64X64	64x64 tile map. (512x512 pixel)
SUP_LOW_MAP_128X64	128x64 tile map. (1024x512 pixel)

Function Documentation

void eris_low_sup_do_dma	(	int	chip,
		u16	src,
		u16	dst,
		u16	len
	)

Perform a 7up DMA.

Parameters:

chip	Which 7up to DMA on. (0 ~ 1)
src	The source address of the DMA.
dst	The destination of the DMA.
len	How many 16bit words to transfer.

void eris_low_sup_init ( int chip )

Initialize a 7up.

Parameters:

chip	Which 7up to initialize. (0 ~ 1)

void eris_low_sup_set_access_width	(	int	chip,
		int	cg_mode,
		sup_low_mapsize	mapsize,
		int	spr_px_w,
		int	vram_px_w
	)

Set access width information.

See the hardware documentation for more information.

Parameters:

chip	Which 7up to set access width information for. (0 ~ 1)
cg_mode	Which character generation is used on vram_px_w = 3.
mapsize	Size of the background map.
spr_px_w	Sprite pixel width. See hardware documentation. (0 ~ 3)
vram_px_w	VRAM pixel width. See hardware documentation. (0 ~ 3)

void eris_low_sup_set_control	(	int	chip,
		int	increment,
		int	bg_show,
		int	spr_show
	)

Set controls for a 7up chip.

Parameters:

chip	Which 7up to set controls for. (0 ~ 1)
increment	How much to increment on every VRAM read/write. See hardwre documentation for which values.
bg_show	Whether the BG should show or not.
spr_show	Whether sprites should show or not.

void eris_low_sup_set_interrupt_raster	(	int	chip,
		int	raster
	)

Set the raster to generate an IRQ from.

Parameters:

chip	Which 7up to set the raster on. (0 ~ 1)
raster	Which raster to generate an IRQ on.

void eris_low_sup_set_interrupts	(	int	chip,
		int	vblank_irq,
		int	raster_irq,
		int	excess_spr,
		int	spr_collision
	)

Set interrupt information for a 7up chip.

Parameters:

chip	Which 7up to set interrupts for. (0 ~ 1)
vblank_irq	Whether an IRQ should fire on VBlank.
raster_irq	Whether an IRQ should fire on raster match.
excess_spr	Whether an IRQ should fire on too many sprites per line.
spr_collision	Whether an IRQ should fire on a sprite overlapping sprite 0.

void eris_low_sup_set_satb_address	(	int	chip,
		u16	addr
	)

Sets the Sprite Attribute Table Block address.

Setting the address starts a VRAM->SATB DMA.

Parameters:

chip	Which 7up to set the SATB for. (0 ~ 1)
addr	VRAM address for the start of the SATB.

void eris_low_sup_set_scroll	(	int	chip,
		u16	x,
		u16	y
	)

Scroll a 7up background.

Parameters:

chip	Which 7up to scroll. (0 ~ 1)
x	Top-left X coordinate of the background.
y	Top-left Y coordinate of the background.

void eris_low_sup_set_video_mode	(	int	chip,
		int	hdispstrt,
		int	hsyncwid,
		int	hdispend,
		int	hdispwid,
		int	vdispstrt,
		int	vsyncwid,
		int	vdispwid,
		int	vdispend
	)

Setup a 7up's video mode.

Parameters:

chip	Which 7up to configure. (0 ~ 1)
hdispstrt	The start of horizontal display, -1. (0 ~ 127)
hsyncwid	The length of hsync. (0 ~ 31)
hdispend	The end of horizontal display, -1. (0 ~ 127)
hdispwid	The length of horizontal display, -1. (0 ~ 127)
vdispstrt	The start of vertical display, -2. (0 ~ 255)
vsyncwid	The length of vsync. (0 ~ 31)
vdispwid	The length of vertical display, -1. (0 ~ 512)
vdispend	The end of vertical display. (0 ~ 255)

void eris_low_sup_set_vram_read	(	int	chip,
		u16	addr
	)

Set the VRAM read address for a 7up chip.

Parameters:

chip	Which 7up to set the read address for. (0 ~ 1)
addr	New VRAM address for read pointer.

void eris_low_sup_set_vram_write	(	int	chip,
		u16	addr
	)

Set the VRAM write address for a 7up chip.

Parameters:

chip	Which 7up to set the write address for. (0 ~ 1)
addr	New VRAM address for write pointer.

void eris_low_sup_setup_dma	(	int	chip,
		int	satb_repeat,
		int	src_dec,
		int	dst_dec,
		int	vram_irq,
		int	satb_irq
	)

Setup the DMA on a 7up.

Parameters:

chip	Which 7up to setup the DMA on. (0 ~ 1)
satb_repeat	Whether to continually DMA the SATB after a transfer.
src_dec	If 1, decrement the source address for each transfer. Otherwise, increment it.
dst_dec	If 1, decrement the destination address for each transfer. Otherwise, increment it.
vram_irq	Fire an IRQ at the end of a VRAM->VRAM transfer.
satb_irq	Fire an IRq at the end of a VRAM->SATB transfer.

u16 eris_low_sup_vram_read ( int chip )

Read from VRAM from a 7up chip.

Parameters:

chip	Which 7up to read data from. (0 ~ 1)

Returns:: The daata located at the read pointer address.

void eris_low_sup_vram_write	(	int	chip,
		u16	data
	)

Write to VRAM on a 7up chip.

Parameters:

chip	Which 7up to write data to. (0 ~ 1)
data	Data to write.

Enumerations

Functions

Detailed Description

Enumeration Type Documentation

Function Documentation