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https://github.com/italicsjenga/agb.git
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68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* Copyright (c) 2013-2016 Jeffrey Pfau
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GBA_DMA_H
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#define GBA_DMA_H
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#include <mgba-util/common.h>
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CXX_GUARD_START
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enum GBADMAControl {
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GBA_DMA_INCREMENT = 0,
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GBA_DMA_DECREMENT = 1,
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GBA_DMA_FIXED = 2,
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GBA_DMA_INCREMENT_RELOAD = 3
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};
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enum GBADMATiming {
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GBA_DMA_TIMING_NOW = 0,
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GBA_DMA_TIMING_VBLANK = 1,
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GBA_DMA_TIMING_HBLANK = 2,
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GBA_DMA_TIMING_CUSTOM = 3
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};
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DECL_BITFIELD(GBADMARegister, uint16_t);
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DECL_BITS(GBADMARegister, DestControl, 5, 2);
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DECL_BITS(GBADMARegister, SrcControl, 7, 2);
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DECL_BIT(GBADMARegister, Repeat, 9);
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DECL_BIT(GBADMARegister, Width, 10);
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DECL_BIT(GBADMARegister, DRQ, 11);
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DECL_BITS(GBADMARegister, Timing, 12, 2);
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DECL_BIT(GBADMARegister, DoIRQ, 14);
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DECL_BIT(GBADMARegister, Enable, 15);
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struct GBADMA {
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GBADMARegister reg;
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uint32_t source;
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uint32_t dest;
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int32_t count;
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uint32_t nextSource;
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uint32_t nextDest;
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int32_t nextCount;
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uint32_t when;
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};
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struct GBA;
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void GBADMAInit(struct GBA* gba);
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void GBADMAReset(struct GBA* gba);
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uint32_t GBADMAWriteSAD(struct GBA* gba, int dma, uint32_t address);
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uint32_t GBADMAWriteDAD(struct GBA* gba, int dma, uint32_t address);
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void GBADMAWriteCNT_LO(struct GBA* gba, int dma, uint16_t count);
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uint16_t GBADMAWriteCNT_HI(struct GBA* gba, int dma, uint16_t control);
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struct GBADMA;
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void GBADMASchedule(struct GBA* gba, int number, struct GBADMA* info);
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void GBADMARunHblank(struct GBA* gba, int32_t cycles);
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void GBADMARunVblank(struct GBA* gba, int32_t cycles);
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void GBADMARunDisplayStart(struct GBA* gba, int32_t cycles);
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void GBADMAUpdate(struct GBA* gba);
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CXX_GUARD_END
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#endif
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