42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
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/***** dma.h *********************************************************
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* (c) 2010 CTA Systems Inc. All rights reserved. Glory To God *
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* *
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* Direct Memory Access (DMA) Routines *
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* =================================== *
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* *
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************************************************************ cta os */
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#ifndef __DMA__H__
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#define __DMA__H__
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enum DMA_MODE_REG_MASK {
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DMAModeMaskSelect = 3,
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DMAModeMaskTra = 0xc,
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DMAModeSelfTest = 0,
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DMAModeReadTransfer = 4,
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DMAModeWriteTransfer = 8,
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DMAModeMaskAuto = 0x10,
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DMAModeMaskIdec = 0x20,
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DMAModeMask = 0xc0,
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DMAModeTransferOnDemand = 0,
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DMAModeTransferSingle = 0x40,
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DMAModeTransferBlock = 0x80,
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DMAModeTransferCascade = 0xC0
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};
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extern void DMASetAddress(unsigned short channel, unsigned char low, unsigned char high);
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extern void DMASetCount (unsigned short channel, unsigned char low, unsigned char high);
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extern void DMASetExternalPageRegisters (unsigned char channel, unsigned char val);
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extern void DMAMaskChannel (unsigned char channel);
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extern void DMAUnmaskChannel (unsigned char channel);
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extern void DMAUnmaskAll();
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extern void DMAResetFlipFlop (unsigned char dma);
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extern void DMAReset ();
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extern void DMASetMode(unsigned char channel, unsigned char mode);
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extern void DMASetRead (unsigned char channel);
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extern void DMASetWrite (unsigned char channel);
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#endif
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