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Linux 2.6 - man page for dsp56k (linux section 4)

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-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  quanti-
       ties 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 Digital Signal Processor User's Manual

COLOPHON
       This page is part of release 3.55 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					    2012-08-05					DSP56K(4)


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