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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 736:a02d1475ccfd
prev561:533f6b478071
author nkeynes
date Mon Jul 14 07:44:42 2008 +0000 (11 years ago)
permissions -rw-r--r--
last change Re-indent everything consistently
Fix include guards for consistency as well
view annotate diff log raw
     1 /**
     2  * $Id$
     3  *
     4  * SH4 onboard DMA controller (DMAC) definitions.
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     8  * This program is free software; you can redistribute it and/or modify
     9  * it under the terms of the GNU General Public License as published by
    10  * the Free Software Foundation; either version 2 of the License, or
    11  * (at your option) any later version.
    12  *
    13  * This program is distributed in the hope that it will be useful,
    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    16  * GNU General Public License for more details.
    17  */
    19 #ifndef lxdream_dmac_H
    20 #define lxdream_dmac_H 1
    22 #include <stdint.h>
    24 #ifdef __cplusplus
    25 extern "C" {
    26 #endif
    28 /* External DREQ. Note only used for DMA memory-to-memory - for single 
    29  * address transfers the device uses DMAC_get_buffer/DMAC_put_buffer.
    30  */
    31 #define DMAC_EXTERNAL 0 
    32 #define DMAC_SCI_TDE 1  /* SCI Transmit data empty */
    33 #define DMAC_SCI_RDF 2  /* SCI Receive data full */
    34 #define DMAC_SCIF_TDE 3 /* SCIF Transmit data empty */
    35 #define DMAC_SCIF_RDF 4 /* SCIF Receive data full */
    36 #define DMAC_TMU_ICI 5  /* TMU Input capture interrupt (not used?) */
    38 /**
    39  * Trigger a DMAC transfer by asserting one of the above DMA request lines
    40  * (from the onboard peripherals). Actual transfer is dependent on the 
    41  * relevant channel configuration.
    42  */
    43 void DMAC_trigger( int dmac_trigger );
    45 /**
    46  * Execute a memory-to-external-device transfer. Copies data into the supplied
    47  * buffer up to a maximum of bytecount bytes. 
    48  * @return Actual number of bytes copied.
    49  */
    50 uint32_t DMAC_get_buffer( int channel, unsigned char *buf, uint32_t bytecount );
    52 /**
    53  * execute an external-device-to-memory transfer. Copies data from the 
    54  * supplied buffer into memory up to a maximum of bytecount bytes. 
    55  * @return Actual number of bytes copied.
    56  */
    57 uint32_t DMAC_put_buffer( int channel, unsigned char *buf, uint32_t bytecount );
    59 #ifdef __cplusplus
    60 }
    61 #endif
    63 #endif /* !lxdream_dmac_H */
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