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| -rw-r--r-- | include/gba/macro.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/gba/macro.h b/include/gba/macro.h index c8139eb97..62d3e73fa 100644 --- a/include/gba/macro.h +++ b/include/gba/macro.h @@ -49,6 +49,11 @@ #define DmaFill16(dmaNum, value, dest, size) DMA_FILL(dmaNum, value, dest, size, 16) #define DmaFill32(dmaNum, value, dest, size) DMA_FILL(dmaNum, value, dest, size, 32) +// Note that the DMA clear macros cause the DMA control value to be calculated +// at runtime rather than compile time. The size is divided by the DMA transfer +// unit size (2 or 4 bytes) and then combined with the DMA control flags using a +// bitwise OR operation. + #define DMA_CLEAR(dmaNum, dest, size, bit) \ { \ vu##bit *_dest = (vu##bit *)(dest); \ |