158 lines
4.9 KiB
HTML
158 lines
4.9 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of DSP56K</TITLE>
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</HEAD><BODY>
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<H1>DSP56K</H1>
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Section: Linux Programmer's Manual (4)<BR>Updated: 2019-03-06<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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dsp56k - DSP56001 interface device
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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#include <<A HREF="file:///usr/include/asm/dsp56k.h">asm/dsp56k.h</A>>
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<B>ssize_t read(int </B><I>fd</I><B>, void *</B><I>data</I><B>, size_t </B><I>length</I><B>);</B>
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<B>ssize_t write(int </B><I>fd</I><B>, void *</B><I>data</I><B>, size_t </B><I>length</I><B>);</B>
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<B>int ioctl(int </B><I>fd</I><B>, DSP56K_UPLOAD, struct dsp56k_upload *</B><I>program</I><B>);</B>
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<B>int ioctl(int </B><I>fd</I><B>, DSP56K_SET_TX_WSIZE, int </B><I>wsize</I><B>);</B>
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<B>int ioctl(int </B><I>fd</I><B>, DSP56K_SET_RX_WSIZE, int </B><I>wsize</I><B>);</B>
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<B>int ioctl(int </B><I>fd</I><B>, DSP56K_HOST_FLAGS, struct dsp56k_host_flags *</B><I>flags</I><B>);</B>
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<B>int ioctl(int </B><I>fd</I><B>, DSP56K_HOST_CMD, int </B><I>cmd</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>CONFIGURATION</H2>
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The dsp56k device is a character device with major number 55 and minor
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number 0.
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<A NAME="lbAE"> </A>
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<H2>DESCRIPTION</H2>
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The Motorola DSP56001 is a fully programmable 24-bit digital signal
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processor found in Atari Falcon030-compatible computers.
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The <I>dsp56k</I> special file is used to control the DSP56001, and
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to send and receive data using the bidirectional handshaked host
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port.
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<P>
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To send a data stream to the signal processor, use
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<B><A HREF="/cgi-bin/man/man2html?2+write">write</A></B>(2)
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to the
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device, and
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<B><A HREF="/cgi-bin/man/man2html?2+read">read</A></B>(2)
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to receive processed data.
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The data can be sent or
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received in 8, 16, 24, or 32-bit quantities on the host side, but will
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always be seen as 24-bit quantities in the DSP56001.
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<P>
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The following
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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calls are used to control the
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<I>dsp56k</I> device:
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<DL COMPACT>
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<DT id="1"><B>DSP56K_UPLOAD</B><DD>
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resets the DSP56001 and uploads a program.
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The third
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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argument must be a pointer to a <I>struct dsp56k_binary</I> with members
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<I>bin</I> pointing to a DSP56001 binary program, and <I>len</I> set to
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the length of the program, counted in 24-bit words.
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<DT id="2"><B>DSP56K_SET_TX_WSIZE</B><DD>
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sets the transmit word size.
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Allowed values are in the range 1 to 4,
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and is the number of bytes that will be sent at a time to the
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DSP56001.
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These data quantities will either be padded with zero
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bytes, or truncated to fit the native 24-bit data format of the
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DSP56001.
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<DT id="3"><B>DSP56K_SET_RX_WSIZE</B><DD>
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sets the receive word size.
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Allowed values are in the range 1 to 4,
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and is the number of bytes that will be received at a time from the
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DSP56001.
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These data quantities will either truncated, or padded with
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a null byte ('\0') to fit the native 24-bit data format of the DSP56001.
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<DT id="4"><B>DSP56K_HOST_FLAGS</B><DD>
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read and write the host flags.
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The host flags are four
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general-purpose bits that can be read by both the hosting computer and
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the DSP56001.
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Bits 0 and 1 can be written by the host, and bits 2 and
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3 can be written by the DSP56001.
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<DT id="5"><DD>
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To access the host flags, the third
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<B><A HREF="/cgi-bin/man/man2html?2+ioctl">ioctl</A></B>(2)
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argument must be a pointer
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to a <I>struct dsp56k_host_flags</I>.
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If bit 0 or 1 is set in the
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<I>dir</I> member, the corresponding bit in <I>out</I> will be written
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to the host flags.
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The state of all host flags will be returned in
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the lower four bits of the <I>status</I> member.
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<DT id="6"><B>DSP56K_HOST_CMD</B><DD>
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sends a host command.
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Allowed values are in the range 0 to 31, and is a
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user-defined command handled by the program running in the DSP56001.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>FILES</H2>
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/dev/dsp56k
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<I>linux/include/asm-m68k/dsp56k.h</I>,
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<I>linux/drivers/char/dsp56k.c</I>,
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DSP56000/DSP56001 Digital Signal Processor User's Manual
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<A NAME="lbAH"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="7"><A HREF="#lbAB">NAME</A><DD>
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<DT id="8"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="9"><A HREF="#lbAD">CONFIGURATION</A><DD>
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<DT id="10"><A HREF="#lbAE">DESCRIPTION</A><DD>
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<DT id="11"><A HREF="#lbAF">FILES</A><DD>
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<DT id="12"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="13"><A HREF="#lbAH">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:01 GMT, March 31, 2021
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</BODY>
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</HTML>
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