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 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.

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

Linux man-pages 6.7                                2023-10-31                                          dsp56k(4)