Man Pages

dsp56k(4) - phpMan dsp56k(4) - phpMan

Command: man perldoc info search(apropos)  


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-compati-
       ble 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 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
              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 Dig-
       ital Signal Processor User's Manual

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2000-03-01                         DSP56K(4)