MI_HBlankDmaCopy*

C Specification

#include <nitro/mi.h>

void MI_HBlankDmaCopy32( u32 dmaNo, const void* src, void* dest, u32 size );
void MI_HBlankDmaCopy16( u32 dmaNo, const void* src, void* dest, u32 size );

void MI_HBlankDmaCopy32If( u32 dmaNo, const void* src, void* dest, u32 size );
void MI_HBlankDmaCopy16If( u32 dmaNo, const void* src, void* dest, u32 size );

Arguments

dmaNo DMA channel used
src The transfer source address.
dest The transfer destination address.
size Transfer size

Return Values

None.

Description

This function uses DMA to copy a H-Blank. When a H-Blank starts, DMA starts.

When using this mode, the access right to main memory should be set to "ARM9 Priority." Otherwise, the screen may not be displayed properly due to the delay that is caused by the startup of DMA memory as ARM7 accesses the main memory. The access right priority can be specified with MI_SetMainMemoryPriority.

The functions void MI_HBlankDmaCopy32If() and void MI_HBlankDmaCopy16If() generate DMA interrupts when DMA terminates.

Internal Operation

Uses the following IO registers: DMAn source register (0x40000B0 + 12n), DMAn destination register (0x40000B4 + 12n), and DMAn control register (0x40000B8 + 12n). n is the DMA channel used.))

See Also

MI_DmaCopy*, MI_SetMainMemoryPriority

Revision History

08/26/2004 Added description about the setting of the ARM9 priority to access the main memory when using DMA memory.
12/01/2003 Initial version.