vdp_dma.h File Reference

VDP DMA support. More...

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Defines
#define	VDP_DMA_VRAM   0
#define	VDP_DMA_CRAM   1
#define	VDP_DMA_VSRAM   2
#define	VDP_doVRamDMA(from, to, len)   VDP_doDMA(VDP_DMA_VRAM, from, to, len)
#define	VDP_doCRamDMA(from, to, len)   VDP_doDMA(VDP_DMA_CRAM, from, to, len)
#define	VDP_doVSRamDMA(from, to, len)   VDP_doDMA(VDP_DMA_VSRAM, from, to, len)
Functions
void	VDP_doDMAEx (u8 location, u32 from, u16 to, u16 len, s16 vramStep)
	Do DMA transfert operation.
void	VDP_doDMA (u8 location, u32 from, u16 to, u16 len)
	Do DMA transfert operation.
void	VDP_doVRamDMAFill (u16 to, u16 len, u8 value)
	Do VRAM DMA fill operation.
void	VDP_doVRamDMACopy (u16 from, u16 to, u16 len)
	Do VRAM DMA copy operation.

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Detailed Description

VDP DMA support.

Author:

Stephane Dallongeville

Date:

08/2011

This unit provides methods to use the VDP DMA capabilities.

---

Define Documentation

#define VDP_DMA_CRAM   1

CRAM location for DMA operation.

#define VDP_DMA_VRAM   0

VRAM location for DMA operation.

#define VDP_DMA_VSRAM   2

VSRAM location for DMA operation.

#define VDP_doCRamDMA	(		from,
			to,
			len
	)		VDP_doDMA(VDP_DMA_CRAM, from, to, len)

Start DMA transfert to CRAM.

Parameters:

from	Source address.
to	Destination address in CRAM.
len	Number of word to transfert.

#define VDP_doVRamDMA	(		from,
			to,
			len
	)		VDP_doDMA(VDP_DMA_VRAM, from, to, len)

Start DMA transfert to VRAM.

Parameters:

from	Source address.
to	Destination address in VRAM.
len	Number of word to transfert.

#define VDP_doVSRamDMA	(		from,
			to,
			len
	)		VDP_doDMA(VDP_DMA_VSRAM, from, to, len)

Start DMA transfert to VSRAM.

Parameters:

from	Source address.
to	Destination address in VSRAM.
len	Number of word to transfert.

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Function Documentation

void VDP_doDMA	(	u8	location,
		u32	from,
		u16	to,
		u16	len
	)

Do DMA transfert operation.

Parameters:

location	Destination location. Accepted values: VDP_DMA_VRAM (for VRAM transfert). VDP_DMA_CRAM (for CRAM transfert). VDP_DMA_VSRAM (for VSRAM transfert).
from	Source address.
to	Destination address.
len	Number of word to transfert.

void VDP_doDMAEx	(	u8	location,
		u32	from,
		u16	to,
		u16	len,
		s16	vramStep
	)

Do DMA transfert operation.

Parameters:

location	Destination location. Accepted values: VDP_DMA_VRAM (for VRAM transfert). VDP_DMA_CRAM (for CRAM transfert). VDP_DMA_VSRAM (for VSRAM transfert).
from	Source address.
to	Destination address.
len	Number of word to transfert.
vramStep	VRam address increment value (-1 to 255). By default you should set it to 2 for normal copy operation but you can use different value for specific operation. -1 means the VRam address increment register won't be modified (use current value).

void VDP_doVRamDMACopy	(	u16	from,
		u16	to,
		u16	len
	)

Do VRAM DMA copy operation.

Parameters:

from	Source address.
to	Destination address.
len	Number of byte to copy.

void VDP_doVRamDMAFill	(	u16	to,
		u16	len,
		u8	value
	)

Do VRAM DMA fill operation.

Parameters:

to	Destination address.
len	Number of byte to fill.
value	Fill value (byte).