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<html><head><!-- /vobs/wpwr/docs/vxworks/ref/fppLib.html - generated by refgen from fppLib.c --> <title> fppLib </title></head><body bgcolor="#FFFFFF"> <hr><a name="top"></a><p align=right><a href="libIndex.htm"><i>VxWorks API Reference : OS Libraries</i></a></p></blockquote><h1>fppLib</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote> <p><strong>fppLib</strong> - floating-point coprocessor support library </p></blockquote><h4>ROUTINES</h4><blockquote><p><p><b><a href="./fppLib.html#fppInit">fppInit</a>( )</b> - initialize floating-point coprocessor support<br><p></blockquote><h4>DESCRIPTION</h4><blockquote><p>This library provides a general interface to the floating-point coprocessor.To activate floating-point support, <b><a href="./fppLib.html#fppInit">fppInit</a>( )</b> must be called before anytasks using the coprocessor are spawned. This is done automatically bythe root task, <b><a href="./usrConfig.html#usrRoot">usrRoot</a>( )</b>, in <b>usrConfig.c</b> when the configuration macro<b>INCLUDE_HW_FP</b> is defined.<p>For information about architecture-dependent floating-point routines, seethe manual entry for <b><a href="./fppArchLib.html#top">fppArchLib</a></b>.<p>The <b>fppShow( )</b> routine displays coprocessor registers on a per-task basis.For information on this facility, see the manual entries for <b><a href="./fppShow.html#top">fppShow</a></b> and<b>fppShow( )</b>.<p><b>VX_FP_TASK</b> OPTIONSaving and restoring floating-point registers adds to the context switchtime of a task. Therefore, floating-point registers are not savedand restored for every task. Only those tasks spawned with the taskoption <b>VX_FP_TASK</b> will have floating-point registers saved and restored.<p></blockquote><h4>NOTE</h4><blockquote><p>If a task does any floating-point operations,it must be spawned with <b>VX_FP_TASK</b>.<p></blockquote><h4>INTERRUPT LEVEL</h4><blockquote><p>Floating-point registers are not saved and restored for interruptservice routines connected with <b><a href="./intArchLib.html#intConnect">intConnect</a>( )</b>. However, if necessary,an interrupt service routine can save and restore floating-point registersby calling routines in <b><a href="./fppArchLib.html#top">fppArchLib</a></b>.<p></blockquote><h4>INCLUDE FILES</h4><blockquote><p><b>fppLib.h</b><p></blockquote><h4>SEE ALSO</h4><blockquote><p><b><a href="./fppArchLib.html#top">fppArchLib</a></b>, <b><a href="./fppShow.html#top">fppShow</a></b>, <b><a href="./intArchLib.html#intConnect">intConnect</a>( )</b>,<i>VxWorks Programmer's Guide: Basic OS </i><hr><a name="fppInit"></a><p align=right><a href="rtnIndex.htm"><i>OS Libraries : Routines</i></a></p></blockquote><h1>fppInit( )</h1> <blockquote></a></blockquote><h4>NAME</h4><blockquote> <p><strong>fppInit( )</strong> - initialize floating-point coprocessor support</p></blockquote><h4>SYNOPSIS</h4><blockquote><p><pre>void fppInit (void)</pre></blockquote><h4>DESCRIPTION</h4><blockquote><p>This routine initializes floating-point coprocessor support and must becalled before using the floating-point coprocessor. This is doneautomatically by the root task, <b><a href="./usrConfig.html#usrRoot">usrRoot</a>( )</b>, in <b>usrConfig.c</b> when theconfiguration macro <b>INCLUDE_HW_FP</b> is defined.<p></blockquote><h4>RETURNS</h4><blockquote><p>N/A</blockquote><h4>SEE ALSO</h4><blockquote><p><b><a href="./fppLib.html#top">fppLib</a></b></body></html>⌨️ 快捷键说明
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