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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 control the
DSP56001, and to send and receive data using the bidirectional 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 quanti-
ties 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_upload 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 bytes containing zero, 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 na-
tive 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 re-
turned 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-de-
fined command handled by the program running in the DSP56001.
FILES
/dev/dsp56k
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
COLOPHON
This page is part of release 5.10 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at https://www.kernel.org/doc/man-pages/.
Linux 2020-08-13 DSP56K(4)
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