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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.
 
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 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() 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>.
        linux/include/asm-m68k/dsp56k.h,           linux/drivers/char/dsp56k.c,
http://dsp56k.nocrew.org/, DSP56000/DSP56001 Digital  Signal  Processor
        User’s Manual
 

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