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8 <h1>ads7828.c</h1><a href="ads7828_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file ads7828.c \brief TI ADS7828 12-bit 8ch A/D Converter Driver Library. */</span>
9 00002 <span class="comment">//*****************************************************************************</span>
10 00003 <span class="comment">//</span>
11 00004 <span class="comment">// File Name : 'ads7828.c'</span>
12 00005 <span class="comment">// Title : TI ADS7828 12-bit 8ch A/D Converter Driver Library</span>
13 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>
14 00007 <span class="comment">// Created : 2004.02.10</span>
15 00008 <span class="comment">// Revised : 2004.02.19</span>
16 00009 <span class="comment">// Version : 0.1</span>
17 00010 <span class="comment">// Target MCU : Atmel AVR Series</span>
18 00011 <span class="comment">// Editor Tabs : 4</span>
19 00012 <span class="comment">//</span>
20 00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>
21 00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>
22 00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>
23 00016 <span class="comment">//</span>
24 00017 <span class="comment">// This code is distributed under the GNU Public License</span>
25 00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
26 00019 <span class="comment">//</span>
27 00020 <span class="comment">//*****************************************************************************</span>
28 00021
29 00022 <span class="preprocessor">#include &lt;avr/io.h&gt;</span>
30 00023 <span class="preprocessor">#include &lt;avr/interrupt.h&gt;</span>
31 00024
32 00025 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>
33 00026 <span class="preprocessor">#include "<a class="code" href="i2c_8h.html">i2c.h</a>"</span>
34 00027 <span class="preprocessor">#include "<a class="code" href="ads7828_8h.html">ads7828.h</a>"</span>
35 00028
36 00029 <span class="comment">// global variables</span>
37 00030 u08 Ads7282RefMode;
38 00031
39 00032 <span class="comment">// Functions</span>
40 <a name="l00033"></a><a class="code" href="group__ads7828.html#ga0">00033</a> u08 <a class="code" href="group__ads7828.html#ga0">ads7828Init</a>(u08 i2cAddr)
41 00034 {
42 00035 u08 channel = 0x80;
43 00036
44 00037 <span class="comment">// setup default A/D voltage reference</span>
45 00038 <a class="code" href="group__ads7828.html#ga1">ads7828SetReference</a>(0);
46 00039
47 00040 <span class="comment">// issue a convserion to test chip presence</span>
48 00041 <span class="comment">// return TRUE if chip detected</span>
49 00042 <span class="comment">// return FALSE if chip does not respond</span>
50 00043 <span class="keywordflow">return</span> (<a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, &amp;channel) == I2C_OK);
51 00044 }
52 00045
53 <a name="l00046"></a><a class="code" href="group__ads7828.html#ga2">00046</a> u16 <a class="code" href="group__ads7828.html#ga2">ads7828Convert</a>(u08 i2cAddr, u08 channel)
54 00047 {
55 00048 <span class="comment">// re-order channel bits for</span>
56 00049 <span class="comment">// logical single-ended channel selection</span>
57 00050 <span class="comment">// channel bit0 -&gt; C2</span>
58 00051 <span class="comment">// channel bit1 -&gt; C0</span>
59 00052 <span class="comment">// channel bit2 -&gt; C1</span>
60 00053 channel = (((channel&gt;&gt;1) | (channel&amp;0x01)&lt;&lt;2)&lt;&lt;4) | <a class="code" href="group__ads7828.html#ga11">ADS7828_CMD_SD</a>;
61 00054 <span class="comment">// do conversion</span>
62 00055 <span class="keywordflow">return</span> <a class="code" href="group__ads7828.html#ga4">ads7828ConvertRaw</a>(i2cAddr, channel);
63 00056 }
64 00057
65 <a name="l00058"></a><a class="code" href="group__ads7828.html#ga3">00058</a> u16 <a class="code" href="group__ads7828.html#ga3">ads7828ConvertDiff</a>(u08 i2cAddr, u08 channel)
66 00059 {
67 00060 <span class="comment">// clear single-ended channel bit</span>
68 00061 channel = (channel&amp;0x07)&lt;&lt;4;
69 00062 <span class="comment">// do conversion</span>
70 00063 <span class="keywordflow">return</span> <a class="code" href="group__ads7828.html#ga4">ads7828ConvertRaw</a>(i2cAddr, channel);
71 00064 }
72 00065
73 <a name="l00066"></a><a class="code" href="group__ads7828.html#ga4">00066</a> u16 <a class="code" href="group__ads7828.html#ga4">ads7828ConvertRaw</a>(u08 i2cAddr, u08 channel)
74 00067 {
75 00068 u08 buffer[2];
76 00069 <span class="comment">// combine raw channel and reference bits</span>
77 00070 channel &amp;= 0xF0;
78 00071 channel |= Ads7282RefMode;
79 00072 <span class="comment">// start conversion on requested channel</span>
80 00073 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, &amp;channel);
81 00074 <span class="comment">// retrieve conversion result</span>
82 00075 <a class="code" href="i2c_8c.html#a25">i2cMasterReceiveNI</a>(i2cAddr, 2, buffer);
83 00076 <span class="comment">// pack bytes and return result</span>
84 00077 <span class="keywordflow">return</span> ((buffer[0]&lt;&lt;8) | buffer[1]);
85 00078 }
86 00079
87 <a name="l00080"></a><a class="code" href="group__ads7828.html#ga1">00080</a> <span class="keywordtype">void</span> <a class="code" href="group__ads7828.html#ga1">ads7828SetReference</a>(u08 ref)
88 00081 {
89 00082 <span class="keywordflow">if</span>(ref)
90 00083 {
91 00084 <span class="comment">// use internal reference</span>
92 00085 Ads7282RefMode = <a class="code" href="group__ads7828.html#ga22">ADS7828_CMD_PDMODE2</a>;
93 00086 }
94 00087 <span class="keywordflow">else</span>
95 00088 {
96 00089 <span class="comment">// use external reference</span>
97 00090 Ads7282RefMode = <a class="code" href="group__ads7828.html#ga20">ADS7828_CMD_PDMODE0</a>;
98 00091 }
99 00092 }
100 </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by&nbsp;
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102 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
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