dsp56k

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 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_binary with mem-
              bers 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 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

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 3.23 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/.



Linux                             2000-03-01                         DSP56K(4)