From Linux Man Pages
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 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 trun-
cated 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 writ-
ten 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 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.
FILES
/dev/dsp56k
RELATED
linux/include/asm-m68k/dsp56k.h, linux/drivers/char/dsp56k.c, http://dsp56k.nocrew.org/, DSP56000/DSP56001 Digi-
tal Signal Processor User's Manual
CATEGORY