Demonstration Instrument Control Unit Software Implementation

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=50 BGCOLOR="#333366" TEXT="#080000"> <div> <B>Demonstration Instrument Control Unit Software Implementation</B></div> <div> </div> </td> </tr><tr> <td valign="top" width=165 BGCOLOR="#CCCC99" TEXT="#080000"> <div> <B> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="132" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 35 ><NOBR><div> <IMG BORDER="0" SRC="1x1.gif" HEIGHT="29" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" WIDTH="21"></div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <A HREF="id141.htm" TARGET="_top" TITLE="ANSI C Source Code"><U><B><IMG SRC="002151d0.gif" border=0 width="21" height="29" ALT="next" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></U></A></div> </NOBR></tD> <tD VALIGN=TOP WIDTH="20"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="35" ALIGN="bottom" WIDTH="20" HSPACE="0" VSPACE="0"></tD> <tD VALIGN=TOP><NOBR><div> <A HREF="id73.htm" TARGET="_top" TITLE="Instrument Control Unit Software"><U><B><IMG SRC="0060d1d0.gif" border=0 width="13" height="29" ALT="up" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></U></A></div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <IMG BORDER="0" SRC="1x1.gif" HEIGHT="29" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" WIDTH="27"></div> </NOBR></tD> </tR> </TABLE></B></div> <div> <B>Demonstration Instrument Control Unit Software Implementation</B></div> <div> <A HREF="id141.htm" TARGET="_top" TITLE="ANSI C Source Code"><U>ANSI C Source Code</U></A></div> </td> <td valign="top" height=430 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> Structure of Source Code Collection</div> <bR> <div> The <A HREF="id125.htm" TARGET="_top" TITLE="Ada 83 Source Code"><U>source code collection</U></A> is structure into three disjoint layers:</div> <bR> <div>      <IMG SRC="0e70d710.gif" border=0 width="269" height="113" ALT="Data Handling Software Layers" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <div> Basic Services</div> <div> This collection of software components provides a range of simple services being shared among all the PUS services.</div> <bR> <div> CDH Structure</div> <div> The general framework in which application processes are to be implemented is provided by this collection. This covers onboard routing and facilities for management of the uplink and downlink data streams.</div> <bR> <div> PUS Services</div> <div> This is a collection of components each implementing a service from the packet utilisation standard. These may be combined (through instantiation) to implement application processes for specific missions.</div> <bR> <div> Source Code Standards</div> <bR> <div> The source code is generally based on the Ansi C programming language.</div> <div> Some commands from the Virtouso Real Time OS which supports multitasking and semaphores are added. The source code was compiled under Virtuoso with a g21k-compiler.</div> <bR> </td> </tr></table></body>