устройство интерфейса DSP56001 (DSP56001 interface device)
Имя (Name)
dsp56k - DSP56001 interface device
Синопсис (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);
Конфигурация (Configuration)
The dsp56k device is a character device with major number 55 and
minor number 0.
Описание (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 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_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 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.
Файлы (Files)
/dev/dsp56k
Смотри также (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
