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dma.cpp
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dma.cpp
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#include "dma.h"
namespace DMA
{
struct DMA_REC
{
const void *source;
void *destination;
uint16_t count;
uint16_t mode;
} __attribute__((aligned(4), packed));
#define REG_DMA ((volatile DMA_REC *)0x040000B0)
#define DMA_DST_INC (0 << 5)
#define DMA_DST_DEC (1 << 5)
#define DMA_DST_FIXED (2 << 5)
#define DMA_DST_RELOAD (3 << 5)
#define DMA_SRC_INC (0 << 7)
#define DMA_SRC_DEC (1 << 7)
#define DMA_SRC_FIXED (2 << 7)
#define DMA_REPEAT (1 << 9)
#define DMA16 (0 << 10)
#define DMA32 (1 << 10)
#define GAMEPAK_DRQ (1 << 11)
#define DMA_IMMEDIATE (0 << 12)
#define DMA_VBLANK (1 << 12)
#define DMA_HBLANK (2 << 12)
#define DMA_SPECIAL (3 << 12)
#define DMA_IRQ (1 << 14)
#define DMA_ENABLE (1 << 15)
static uint32_t DMAFillTempValue;
/*//! General DMA transfer macro
#define DMA_TRANSFER(_destination, _source, count, channel, mode) \
do \
{ \
REG_DMA[channel].mode = 0; \
REG_DMA[channel].source = (const void *)(_source); \
REG_DMA[channel].destination = (void *)(_destination); \
REG_DMA[channel].count = (count); \
REG_DMA[channel].mode = (mode); \
} while (0)
*/
void dma_fill32(void *destination, uint32_t value, uint16_t nrOfWords)
{
// wait for previous transfer to finish
while (REG_DMA[3].mode & DMA_ENABLE)
{
}
DMAFillTempValue = value;
REG_DMA[3].source = reinterpret_cast<const void *>(&DMAFillTempValue);
REG_DMA[3].destination = destination;
REG_DMA[3].count = nrOfWords;
REG_DMA[3].mode = DMA32 | DMA_DST_INC | DMA_SRC_FIXED | DMA_ENABLE;
// wait for transfer to finish
while (REG_DMA[3].mode & DMA_ENABLE)
{
}
}
void dma_copy32(void *destination, const uint32_t *source, uint16_t nrOfWords)
{
// wait for previous transfer to finish
while (REG_DMA[3].mode & DMA_ENABLE)
{
}
REG_DMA[3].source = reinterpret_cast<const void *>(source);
REG_DMA[3].destination = destination;
REG_DMA[3].count = nrOfWords;
REG_DMA[3].mode = DMA32 | DMA_DST_INC | DMA_SRC_INC | DMA_ENABLE;
// wait for transfer to finish
while (REG_DMA[3].mode & DMA_ENABLE)
{
}
}
} // namespace DMA