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lxdream.org :: lxdream/src/sh4/dmac.h
lxdream 0.9.1
released Jun 29
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filename src/sh4/dmac.h
changeset 561:533f6b478071
prev430:467519b050f4
next736:a02d1475ccfd
author nkeynes
date Tue Jan 01 05:08:38 2008 +0000 (12 years ago)
branchlxdream-mmu
permissions -rw-r--r--
last change Enable Id keyword on all source files
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/**
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 * $Id$
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 *
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 * SH4 onboard DMA controller (DMAC) definitions.
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 *
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 * Copyright (c) 2005 Nathan Keynes.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 */
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#ifndef dream_sh4dmac_H
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#define dream_sh4dmac_H 1
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* External DREQ. Note only used for DMA memory-to-memory - for single 
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 * address transfers the device uses DMAC_get_buffer/DMAC_put_buffer.
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 */
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#define DMAC_EXTERNAL 0 
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#define DMAC_SCI_TDE 1  /* SCI Transmit data empty */
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#define DMAC_SCI_RDF 2  /* SCI Receive data full */
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#define DMAC_SCIF_TDE 3 /* SCIF Transmit data empty */
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#define DMAC_SCIF_RDF 4 /* SCIF Receive data full */
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#define DMAC_TMU_ICI 5  /* TMU Input capture interrupt (not used?) */
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/**
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 * Trigger a DMAC transfer by asserting one of the above DMA request lines
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 * (from the onboard peripherals). Actual transfer is dependent on the 
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 * relevant channel configuration.
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 */
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void DMAC_trigger( int dmac_trigger );
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/**
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 * Execute a memory-to-external-device transfer. Copies data into the supplied
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 * buffer up to a maximum of bytecount bytes. 
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 * @return Actual number of bytes copied.
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 */
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uint32_t DMAC_get_buffer( int channel, unsigned char *buf, uint32_t bytecount );
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/**
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 * execute an external-device-to-memory transfer. Copies data from the 
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 * supplied buffer into memory up to a maximum of bytecount bytes. 
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 * @return Actual number of bytes copied.
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 */
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uint32_t DMAC_put_buffer( int channel, unsigned char *buf, uint32_t bytecount );
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#ifdef __cplusplus
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}
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#endif
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#endif
.