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<a class="el" href="dir_897b6a2d7bab147dd1db58381aad3984.html">src</a> » <a class="el" href="dir_832905b1f7f5feaf61a306b40c0ac817.html">sys</a> » <a class="el" href="dir_2f8fc94d4f17c865dd63167e45dee9cf.html">isa</a></div>
<h1>pit.c</h1><a href="pit_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*****************************************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"> Copyright (c) 2002-2004 The UbixOS Project</span>
<a name="l00003"></a>00003 <span class="comment"> All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Redistribution and use in source and binary forms, with or without modification, are</span>
<a name="l00006"></a>00006 <span class="comment"> permitted provided that the following conditions are met:</span>
<a name="l00007"></a>00007 <span class="comment"></span>
<a name="l00008"></a>00008 <span class="comment"> Redistributions of source code must retain the above copyright notice, this list of</span>
<a name="l00009"></a>00009 <span class="comment"> conditions, the following disclaimer and the list of authors. Redistributions in binary</span>
<a name="l00010"></a>00010 <span class="comment"> form must reproduce the above copyright notice, this list of conditions, the following</span>
<a name="l00011"></a>00011 <span class="comment"> disclaimer and the list of authors in the documentation and/or other materials provided</span>
<a name="l00012"></a>00012 <span class="comment"> with the distribution. Neither the name of the UbixOS Project nor the names of its</span>
<a name="l00013"></a>00013 <span class="comment"> contributors may be used to endorse or promote products derived from this software</span>
<a name="l00014"></a>00014 <span class="comment"> without specific prior written permission.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY</span>
<a name="l00017"></a>00017 <span class="comment"> EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span>
<a name="l00018"></a>00018 <span class="comment"> MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL</span>
<a name="l00019"></a>00019 <span class="comment"> THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00020"></a>00020 <span class="comment"> SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span>
<a name="l00021"></a>00021 <span class="comment"> OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
<a name="l00022"></a>00022 <span class="comment"> HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR</span>
<a name="l00023"></a>00023 <span class="comment"> TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00024"></a>00024 <span class="comment"> SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00025"></a>00025 <span class="comment"></span>
<a name="l00026"></a>00026 <span class="comment"> $Id: pit_8c-source.html 88 2016-01-12 00:11:29Z reddawg $</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">*****************************************************************************************/</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#include <<a class="code" href="pit_8h.html">isa/pit.h</a>></span>
<a name="l00031"></a>00031 <span class="preprocessor">#include <<a class="code" href="io_8h.html">sys/io.h</a>></span>
<a name="l00032"></a>00032 <span class="preprocessor">#include <<a class="code" href="kprintf_8h.html">lib/kprintf.h</a>></span>
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">/*****************************************************************************************</span>
<a name="l00035"></a>00035 <span class="comment"></span>
<a name="l00036"></a>00036 <span class="comment"> Function: int pitInit()</span>
<a name="l00037"></a>00037 <span class="comment"></span>
<a name="l00038"></a>00038 <span class="comment"> Description: This Function Will Initialize The Programmable Timer</span>
<a name="l00039"></a>00039 <span class="comment"></span>
<a name="l00040"></a>00040 <span class="comment"> Notes:</span>
<a name="l00041"></a>00041 <span class="comment"></span>
<a name="l00042"></a>00042 <span class="comment"> 0040 r/w PIT counter 0, counter divisor (XT, AT, PS/2)</span>
<a name="l00043"></a>00043 <span class="comment"> 0041 r/w PIT counter 1, RAM refresh counter (XT, AT)</span>
<a name="l00044"></a>00044 <span class="comment"> 0042 r/w PIT counter 2, cassette & speaker (XT, AT, PS/2)</span>
<a name="l00045"></a>00045 <span class="comment"> 0043 r/w PIT mode port, control word register for counters 0-2</span>
<a name="l00046"></a>00046 <span class="comment"></span>
<a name="l00047"></a>00047 <span class="comment"> bit 7-6 = 00 counter 0 select</span>
<a name="l00048"></a>00048 <span class="comment"> = 01 counter 1 select (not PS/2)</span>
<a name="l00049"></a>00049 <span class="comment"> = 10 counter 2 select</span>
<a name="l00050"></a>00050 <span class="comment"> bit 5-4 = 00 counter latch command</span>
<a name="l00051"></a>00051 <span class="comment"> = 01 read/write counter bits 0-7 only</span>
<a name="l00052"></a>00052 <span class="comment"> = 10 read/write counter bits 8-15 only</span>
<a name="l00053"></a>00053 <span class="comment"> = 11 read/write counter bits 0-7 first, then 8-15</span>
<a name="l00054"></a>00054 <span class="comment"> bit 3-1 = 000 mode 0 select</span>
<a name="l00055"></a>00055 <span class="comment"> = 001 mode 1 select - programmable one shot</span>
<a name="l00056"></a>00056 <span class="comment"> = x10 mode 2 select - rate generator</span>
<a name="l00057"></a>00057 <span class="comment"> = x11 mode 3 select - square wave generator</span>
<a name="l00058"></a>00058 <span class="comment"> = 100 mode 4 select - software triggered strobe</span>
<a name="l00059"></a>00059 <span class="comment"> = 101 mode 5 select - hardware triggered strobe</span>
<a name="l00060"></a>00060 <span class="comment"> bit 0 = 0 binary counter 16 bits</span>
<a name="l00061"></a>00061 <span class="comment"> = 1 BCD counter</span>
<a name="l00062"></a>00062 <span class="comment"></span>
<a name="l00063"></a>00063 <span class="comment">*****************************************************************************************/</span>
<a name="l00064"></a><a class="code" href="pit_8c.html#d7178bcaf8f93f5c16d41305f7338951">00064</a> <span class="keywordtype">int</span> <a class="code" href="pit_8h.html#d7178bcaf8f93f5c16d41305f7338951">pit_init</a>() {
<a name="l00065"></a>00065 <a class="code" href="io_8h.html#f0c1dd5717007bf73b6c5119dfe7eaf2">outportByteP</a>(0x43,0x36);
<a name="l00066"></a>00066 <a class="code" href="io_8h.html#f0c1dd5717007bf73b6c5119dfe7eaf2">outportByteP</a>(0x40,((1193180/<a class="code" href="pit_8h.html#79dd6d2988a42b679f7cafd67c7f20a1">PIT_TIMER</a>) & 0xFF));
<a name="l00067"></a>00067 <a class="code" href="io_8h.html#8acc1a06073db2e7b92ffbd00fbd0cf1">outportByte</a>(0x40,(((1193180/<a class="code" href="pit_8h.html#79dd6d2988a42b679f7cafd67c7f20a1">PIT_TIMER</a>) >> 8) & 0xFF));
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">/* Print out information on the PIT */</span>
<a name="l00070"></a>00070 <a class="code" href="kprint_8h.html#b2761bdf0cca73ad0fb5880895210cd8">kprintf</a>(<span class="stringliteral">"pit0 - Port [0x%X], Timer Hz: [%iHz]\n"</span>,0x43,<a class="code" href="pit_8h.html#79dd6d2988a42b679f7cafd67c7f20a1">PIT_TIMER</a>);
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="comment">/* Return so we know everything went well */</span>
<a name="l00073"></a>00073 <span class="keywordflow">return</span>(0x0);
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076 <span class="comment">/***</span>
<a name="l00077"></a>00077 <span class="comment"> $Log: pit_8c-source.html,v $
<a name="l00077"></a>00077 <span class="comment"> Revision 1.7 2006/12/15 17:47:06 reddawg
<a name="l00077"></a>00077 <span class="comment"> Updates
<a name="l00077"></a>00077 <span class="comment"></span>
<a name="l00078"></a>00078 <span class="comment"> Revision 1.1.1.1 2006/06/01 12:46:12 reddawg</span>
<a name="l00079"></a>00079 <span class="comment"> ubix2</span>
<a name="l00080"></a>00080 <span class="comment"></span>
<a name="l00081"></a>00081 <span class="comment"> Revision 1.2 2005/10/12 00:13:37 reddawg</span>
<a name="l00082"></a>00082 <span class="comment"> Removed</span>
<a name="l00083"></a>00083 <span class="comment"></span>
<a name="l00084"></a>00084 <span class="comment"> Revision 1.1.1.1 2005/09/26 17:24:03 reddawg</span>
<a name="l00085"></a>00085 <span class="comment"> no message</span>
<a name="l00086"></a>00086 <span class="comment"></span>
<a name="l00087"></a>00087 <span class="comment"> Revision 1.7 2004/07/16 04:06:32 reddawg</span>
<a name="l00088"></a>00088 <span class="comment"> Tune ups this stuff should of been taken care of months ago</span>
<a name="l00089"></a>00089 <span class="comment"></span>
<a name="l00090"></a>00090 <span class="comment"> Revision 1.6 2004/07/16 01:08:58 reddawg</span>
<a name="l00091"></a>00091 <span class="comment"> Whew we work once again</span>
<a name="l00092"></a>00092 <span class="comment"></span>
<a name="l00093"></a>00093 <span class="comment"> Revision 1.5 2004/07/09 13:29:15 reddawg</span>
<a name="l00094"></a>00094 <span class="comment"> pit: pitInit to pit_init</span>
<a name="l00095"></a>00095 <span class="comment"> Adjusted initialization routines</span>
<a name="l00096"></a>00096 <span class="comment"></span>
<a name="l00097"></a>00097 <span class="comment"> Revision 1.4 2004/05/21 12:48:22 reddawg</span>
<a name="l00098"></a>00098 <span class="comment"> Cleaned up</span>
<a name="l00099"></a>00099 <span class="comment"></span>
<a name="l00100"></a>00100 <span class="comment"> Revision 1.3 2004/05/20 22:51:09 reddawg</span>
<a name="l00101"></a>00101 <span class="comment"> Cleaned Up Warnings</span>
<a name="l00102"></a>00102 <span class="comment"></span>
<a name="l00103"></a>00103 <span class="comment"> Revision 1.2 2004/05/10 02:23:24 reddawg</span>
<a name="l00104"></a>00104 <span class="comment"> Minor Changes To Source Code To Prepare It For Open Source Release</span>
<a name="l00105"></a>00105 <span class="comment"></span>
<a name="l00106"></a>00106 <span class="comment"> END</span>
<a name="l00107"></a>00107 <span class="comment"> ***/</span>
<a name="l00108"></a>00108
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Fri Dec 15 11:18:55 2006 for UbixOS V2 by
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