dma.h

説明を見る。

/*---------------------------------------------------------------------------------

        Copyright (C) 2005
                Jason Rogers (dovoto)
                Dave Murphy (WinterMute)

        This software is provided 'as-is', without any express or implied
        warranty.  In no event will the authors be held liable for any
        damages arising from the use of this software.

        Permission is granted to anyone to use this software for any
        purpose, including commercial applications, and to alter it and
        redistribute it freely, subject to the following restrictions:

        1.      The origin of this software must not be misrepresented; you
                must not claim that you wrote the original software. If you use
                this software in a product, an acknowledgment in the product
                documentation would be appreciated but is not required.

        2.      Altered source versions must be plainly marked as such, and
                must not be misrepresented as being the original software.

        3.      This notice may not be removed or altered from any source
                distribution.

---------------------------------------------------------------------------------*/
#ifndef NDS_DMA_INCLUDE
#define NDS_DMA_INCLUDE

#include "nds/ndstypes.h"

#define DMA0_SRC       (*(vuint32*)0x040000B0)
#define DMA0_DEST      (*(vuint32*)0x040000B4)
#define DMA0_CR        (*(vuint32*)0x040000B8)

#define DMA1_SRC       (*(vuint32*)0x040000BC)
#define DMA1_DEST      (*(vuint32*)0x040000C0)
#define DMA1_CR        (*(vuint32*)0x040000C4)

#define DMA2_SRC       (*(vuint32*)0x040000C8)
#define DMA2_DEST      (*(vuint32*)0x040000CC)
#define DMA2_CR        (*(vuint32*)0x040000D0)

#define DMA3_SRC       (*(vuint32*)0x040000D4)
#define DMA3_DEST      (*(vuint32*)0x040000D8)
#define DMA3_CR        (*(vuint32*)0x040000DC)


#define DMA_SRC(n)     (*(vuint32*)(0x040000B0+(n*12)))
#define DMA_DEST(n)    (*(vuint32*)(0x040000B4+(n*12)))
#define DMA_CR(n)      (*(vuint32*)(0x040000B8+(n*12)))

#ifdef ARM9
#define DMA_FILL(n)    (*(vuint32*)(0x040000E0+(n*4)))
#endif

// DMA control register contents
// The defaults are 16-bit, increment source/dest addresses, no irq
#define DMA_ENABLE      BIT(31)
#define DMA_BUSY            BIT(31)
#define DMA_IRQ_REQ     BIT(30)

#define DMA_START_NOW   0
#define DMA_START_CARD  (5<<27)

#ifdef ARM7
#define DMA_START_VBL   BIT(27)
#endif

#ifdef ARM9
#define DMA_START_HBL   BIT(28)
#define DMA_START_VBL   BIT(27)
#define DMA_START_FIFO  (7<<27)
#define DMA_DISP_FIFO   (4<<27)
#endif

#define DMA_16_BIT      0
#define DMA_32_BIT      BIT(26)


#define DMA_REPEAT      BIT(25)

#define DMA_SRC_INC     (0)
#define DMA_SRC_DEC     BIT(23)
#define DMA_SRC_FIX     BIT(24)

#define DMA_DST_INC     (0)
#define DMA_DST_DEC     BIT(21)
#define DMA_DST_FIX     BIT(22)
#define DMA_DST_RESET   (3<<21)

#define DMA_COPY_WORDS     (DMA_ENABLE | DMA_32_BIT | DMA_START_NOW)
#define DMA_COPY_HALFWORDS (DMA_ENABLE | DMA_16_BIT | DMA_START_NOW)
#define DMA_FIFO        (DMA_ENABLE | DMA_32_BIT  | DMA_DST_FIX | DMA_START_FIFO)

static inline 
void dmaCopyWords(uint8 channel, const void* src, void* dest, uint32 size) {
        DMA_SRC(channel) = (uint32)src;
        DMA_DEST(channel) = (uint32)dest;
        DMA_CR(channel) = DMA_COPY_WORDS | (size>>2);
        while(DMA_CR(channel) & DMA_BUSY);
}

static inline 
void dmaCopyHalfWords(uint8 channel, const void* src, void* dest, uint32 size) {
        DMA_SRC(channel) = (uint32)src;
        DMA_DEST(channel) = (uint32)dest;
        DMA_CR(channel) = DMA_COPY_HALFWORDS | (size>>1);
        while(DMA_CR(channel) & DMA_BUSY);
}

static inline 
void dmaCopy(const void * source, void * dest, uint32 size) {
        DMA_SRC(3) = (uint32)source;
        DMA_DEST(3) = (uint32)dest;
        DMA_CR(3) = DMA_COPY_HALFWORDS | (size>>1);
        while(DMA_CR(3) & DMA_BUSY);
}

static inline 
void dmaCopyWordsAsynch(uint8 channel, const void* src, void* dest, uint32 size) {
        DMA_SRC(channel) = (uint32)src;
        DMA_DEST(channel) = (uint32)dest;
        DMA_CR(channel) = DMA_COPY_WORDS | (size>>2);

}

static inline 
void dmaCopyHalfWordsAsynch(uint8 channel, const void* src, void* dest, uint32 size) {
        DMA_SRC(channel) = (uint32)src;
        DMA_DEST(channel) = (uint32)dest;
        DMA_CR(channel) = DMA_COPY_HALFWORDS | (size>>1);
}

static inline 
void dmaCopyAsynch(const void * source, void * dest, uint32 size) {
        DMA_SRC(3) = (uint32)source;
        DMA_DEST(3) = (uint32)dest;
        DMA_CR(3) = DMA_COPY_HALFWORDS | (size>>1);
}

static inline 
void dmaFillWords( u32 value, void* dest, uint32 size) {
#ifdef ARM7     
        (*(vu32*)0x027FFE04) = (vu32) value;
        DMA_SRC(3) = 0x027FFE04;
#else   
        DMA_FILL(3) = (vuint32)value;
        DMA_SRC(3) = (uint32)&DMA_FILL(3);
#endif  

    DMA_DEST(3) = (uint32)dest;
        DMA_CR(3) = DMA_SRC_FIX | DMA_COPY_WORDS | (size>>2);
        while(DMA_CR(3) & DMA_BUSY);
}

static inline 
void dmaFillHalfWords( u16 value, void* dest, uint32 size) {
#ifdef ARM7     
        (*(vu32*)0x027FFE04) = (vu32) value;
        DMA_SRC(3) = 0x027FFE04;
#else   
        DMA_FILL(3) = (vuint32)value;
        DMA_SRC(3) = (uint32)&DMA_FILL(3);
#endif

        DMA_DEST(3) = (uint32)dest;
        DMA_CR(3) = DMA_SRC_FIX | DMA_COPY_HALFWORDS | (size>>1);
        while(DMA_CR(3) & DMA_BUSY);
}

static inline 
int dmaBusy(uint8 channel) {
        return (DMA_CR(channel) & DMA_BUSY)>>31;
}


#endif

---