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<div class="title">pit.c</div> </div>
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<a href="pit_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2002-2018 The UbixOS Project.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * This was developed by Christopher W. Olsen for the UbixOS Project.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification, are permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * provided that the following conditions are met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * 1) Redistributions of source code must retain the above copyright notice, this list of</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * conditions, the following disclaimer and the list of authors.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * 2) Redistributions in binary form must reproduce the above copyright notice, this list of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * conditions, the following disclaimer and the list of authors in the documentation and/or</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * other materials provided with the distribution.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * endorse or promote products derived from this software without specific prior written</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * permission.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <<a class="code" href="pit_8h.html">isa/pit.h</a>></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <<a class="code" href="io_8h.html">sys/io.h</a>></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <<a class="code" href="kprintf_8h.html">lib/kprintf.h</a>></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">/*****************************************************************************************</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"></span> </div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> Function: int pitInit()</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"></span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> Description: This Function Will Initialize The Programmable Timer</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"></span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> Notes:</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"></span> </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> 0040 r/w PIT counter 0, counter divisor (XT, AT, PS/2)</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> 0041 r/w PIT counter 1, RAM refresh counter (XT, AT)</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> 0042 r/w PIT counter 2, cassette & speaker (XT, AT, PS/2)</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> 0043 r/w PIT mode port, control word register for counters 0-2</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"></span> </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> bit 7-6 = 00 counter 0 select</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> = 01 counter 1 select (not PS/2)</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> = 10 counter 2 select</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> bit 5-4 = 00 counter latch command</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> = 01 read/write counter bits 0-7 only</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> = 10 read/write counter bits 8-15 only</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> = 11 read/write counter bits 0-7 first, then 8-15</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> bit 3-1 = 000 mode 0 select</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> = 001 mode 1 select - programmable one shot</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> = x10 mode 2 select - rate generator</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> = x11 mode 3 select - square wave generator</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> = 100 mode 4 select - software triggered strobe</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> = 101 mode 5 select - hardware triggered strobe</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> bit 0 = 0 binary counter 16 bits</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> = 1 BCD counter</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span> </div>
<div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="pit_8c.html#ad7178bcaf8f93f5c16d41305f7338951"> 62</a></span> <span class="comment"> *****************************************************************************************/</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keywordtype">int</span> <a class="code" href="pit_8c.html#ad7178bcaf8f93f5c16d41305f7338951">pit_init</a>() {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="io_8h.html#af0c1dd5717007bf73b6c5119dfe7eaf2">outportByteP</a>(0x43, 0x36);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <a class="code" href="io_8h.html#af0c1dd5717007bf73b6c5119dfe7eaf2">outportByteP</a>(0x40, ((1193180 / <a class="code" href="pit_8h.html#a79dd6d2988a42b679f7cafd67c7f20a1">PIT_TIMER</a>) & 0xFF));</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <a class="code" href="io_8h.html#a8acc1a06073db2e7b92ffbd00fbd0cf1">outportByte</a>(0x40, (((1193180 / <a class="code" href="pit_8h.html#a79dd6d2988a42b679f7cafd67c7f20a1">PIT_TIMER</a>) >> 8) & 0xFF));</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">/* Print out information on the PIT */</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="kprintf_8h.html#a20b56810edb62a6fe59917015c30848f">kprintf</a>(<span class="stringliteral">"pit0 - Port [0x%X], Timer Hz: [%iHz]\n"</span>, 0x43, <a class="code" href="pit_8h.html#a79dd6d2988a42b679f7cafd67c7f20a1">PIT_TIMER</a>);</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">/* Return so we know everything went well */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">return</span> (0x0);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> }</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">/***</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> $Log: pit.c,v $</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> Revision 1.1.1.1 2006/06/01 12:46:12 reddawg</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> ubix2</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"></span> </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> Revision 1.2 2005/10/12 00:13:37 reddawg</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> Removed</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"></span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> Revision 1.1.1.1 2005/09/26 17:24:03 reddawg</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> no message</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"></span> </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> Revision 1.7 2004/07/16 04:06:32 reddawg</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> Tune ups this stuff should of been taken care of months ago</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"></span> </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> Revision 1.6 2004/07/16 01:08:58 reddawg</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> Whew we work once again</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"></span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> Revision 1.5 2004/07/09 13:29:15 reddawg</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> pit: pitInit to pit_init</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> Adjusted initialization routines</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span> </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> Revision 1.4 2004/05/21 12:48:22 reddawg</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> Cleaned up</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"></span> </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> Revision 1.3 2004/05/20 22:51:09 reddawg</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> Cleaned Up Warnings</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"></span> </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> Revision 1.2 2004/05/10 02:23:24 reddawg</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> Minor Changes To Source Code To Prepare It For Open Source Release</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"></span> </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> END</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> ***/</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
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<div class="ttc" id="apit_8c_html_ad7178bcaf8f93f5c16d41305f7338951"><div class="ttname"><a href="pit_8c.html#ad7178bcaf8f93f5c16d41305f7338951">pit_init</a></div><div class="ttdeci">int pit_init()</div><div class="ttdef"><b>Definition:</b> <a href="pit_8c_source.html#l00062">pit.c:62</a></div></div>
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