dsp56k — DSP56001 interface device
#include <asm/dsp56k.h>
ssize_t read( |
int | fd, |
| void * | data, | |
| size_t | length); |
ssize_t write( |
int | fd, |
| void * | data, | |
| size_t | length); |
int
ioctl( |
int | fd, |
| DSP56K_UPLOAD, | ||
| struct dsp56k_upload * | program); |
int
ioctl( |
int | fd, |
| DSP56K_SET_TX_WSIZE, | ||
| int | wsize); |
int
ioctl( |
int | fd, |
| DSP56K_SET_RX_WSIZE, | ||
| int | wsize); |
int
ioctl( |
int | fd, |
| DSP56K_HOST_FLAGS, | ||
| struct dsp56k_host_flags * | flags); |
int
ioctl( |
int | fd, |
| DSP56K_HOST_CMD, | ||
| int | cmd); |
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_UPLOADresets 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_WSIZEsets 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_WSIZEsets 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_FLAGSread 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_CMDsends 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.
linux/include/asm-m68k/dsp56k.h,
linux/drivers/char/dsp56k.c,
http://dsp56k.nocrew.org/,
DSP56000/DSP56001 Digital Signal Processor User's Manual
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
t Copyright (c) 2000 lars brinkhoff <larsnocrew.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, larsnocrew.org |