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Name
dsp56k — DSP56001 interface device
Synopsis
#include <asm/dsp56k.h>
ssize_t read( |
int |
fd, |
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void * |
data, |
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size_t |
length); |
ssize_t write( |
int |
fd, |
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void * |
data, |
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size_t |
length); |
int
ioctl( |
int |
fd, |
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DSP56K_UPLOAD, |
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struct dsp56k_upload
* |
program); |
int
ioctl( |
int |
fd, |
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DSP56K_SET_TX_WSIZE, |
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int |
wsize); |
int
ioctl( |
int |
fd, |
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DSP56K_SET_RX_WSIZE, |
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int |
wsize); |
int
ioctl( |
int |
fd, |
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DSP56K_HOST_FLAGS, |
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struct dsp56k_host_flags
* |
flags); |
int
ioctl( |
int |
fd, |
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DSP56K_HOST_CMD, |
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int |
cmd); |
CONFIGURATION
The dsp56k device is a character device with major number
55 and minor number 0.
DESCRIPTION
The Motorola DSP56001 is a fully programmable 24-bit
digital signal processor found in Atari Falcon030-compatible
computers. The dsp56k special file is used
to control the DSP56001, and to send and receive data using
the bi-directional handshaked host port.
To send a data stream to the signal processor, use
write(2) to the device, and
read(2) to receive
processed data. The data can be sent or received in 8, 16,
24, or 32-bit quantities on the host side, but will always be
seen as 24-bit quantities in the DSP56001.
The following ioctl(2) calls are used to
control the dsp56k
device:
DSP56K_UPLOAD-
resets the DSP56001 and uploads a program. The third
ioctl(2) argument
must be a pointer to a struct dsp56k_binary with
members bin
pointing to a DSP56001 binary program, and len set to the length
of the program, counted in 24-bit words.
DSP56K_SET_TX_WSIZE-
sets the transmit word size. Allowed values are in
the range 1 to 4, and is the number of bytes that will
be sent at a time to the DSP56001. These data
quantities will either be padded with zero bytes, or
truncated to fit the native 24-bit data format of the
DSP56001.
DSP56K_SET_RX_WSIZE-
sets the receive word size. Allowed values are in
the range 1 to 4, and is the number of bytes that will
be received at a time from the DSP56001. These data
quantities will either truncated, or padded with a null
byte ('\0') to fit the native 24-bit data format of the
DSP56001.
DSP56K_HOST_FLAGS-
read and write the host flags. The host flags are
four general-purpose bits that can be read by both the
hosting computer and the DSP56001. Bits 0 and 1 can be
written by the host, and bits 2 and 3 can be written by
the DSP56001.
To access the host flags, the third ioctl(2) argument
must be a pointer to a struct dsp56k_host_flags. If
bit 0 or 1 is set in the dir member, the corresponding
bit in out
will be written to the host flags. The state of all
host flags will be returned in the lower four bits of
the status
member.
DSP56K_HOST_CMD-
sends a host command. Allowed values are in the
range 0 to 31, and is a user-defined command handled by
the program running in the DSP56001.
AUTHORS
Fredrik Noring <noring@nocrew.org>, lars brinkhoff
<lars@nocrew.org>, Tomas Berndtsson
<tomas@nocrew.org>.
SEE ALSO
linux/include/asm-m68k/dsp56k.h,
linux/drivers/char/dsp56k.c, http://dsp56k.nocrew.org/,
DSP56000/DSP56001 Digital Signal Processor User's Manual
t
Copyright (c) 2000 lars brinkhoff <lars@nocrew.org>
This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The GNU General Public License's references to "object code"
and "executables" are to be interpreted as the output of any
document formatting or typesetting system, including
intermediate and printed output.
This manual is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this manual; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
USA.
Modified, Thu Jan 27 19:16:19 CET 2000, lars@nocrew.org
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