dsp56k

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 bi-directional handshaked host port.

       To  send	 a  data  stream  to the signal processor, use write() to the
       device, and read() 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()
	      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 zero byte 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 gen-
	      eral-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() 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

AUTHORS
       Fredrik Noring <noring@nocrew.org>, lars brinkhoff  <lars@nocrew.org>,
       Tomas Berndtsson <tomas@nocrew.org>.

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



Special files			  2000-03-01			    DSP56K(4)