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DSP56K(4) Linux Programmer’s Manual DSP56K(4)
NAME
dsp56k - DSP56001 interface device
SYNOPSIS
#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);
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 con-
trol 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() to the device, and
read() 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() 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 zero byte 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() argument must be a pointer to a
struct dsp56k_host_flags. If bit 0 or 1 is set in the dir member, the cor-
responding 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.
FILES
/dev/dsp56k
AUTHORS
Fredrik Noring <noring AT nocrew.org>, lars brinkhoff <lars AT nocrew.org>, Tomas
Berndtsson <tomas AT 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
Special files 2000-03-01 DSP56K(4)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2008-08-30 09:26 @38.103.63.61 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)