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3 <title>Procyon AVRlib: ds1631.c Source File</title>
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8 <h1>ds1631.c</h1><a href="ds1631_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file ds1631.c \brief Dallas DS1631 Temperature Sensor Driver Library. */</span>
9 00002 <span class="comment">//*****************************************************************************</span>
10 00003 <span class="comment">//</span>
11 00004 <span class="comment">// File Name : 'ds1631.c'</span>
12 00005 <span class="comment">// Title : Dallas DS1631 Temperature Sensor 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="timer_8h.html">timer.h</a>"</span>
34 00027 <span class="preprocessor">#include "<a class="code" href="i2c_8h.html">i2c.h</a>"</span>
35 00028 <span class="preprocessor">#include "<a class="code" href="ds1631_8h.html">ds1631.h</a>"</span>
36 00029
37 00030 <span class="comment">// global variables</span>
38 00031
39 00032 <span class="comment">// Functions</span>
40 <a name="l00033"></a><a class="code" href="ds1631_8h.html#a16">00033</a> u08 <a class="code" href="ds1631_8c.html#a0">ds1631Init</a>(u08 i2cAddr)
41 00034 {
42 00035 u08 chip_ok;
43 00036 <span class="comment">// issue a reset</span>
44 00037 <span class="keywordflow">if</span>(<a class="code" href="ds1631_8c.html#a1">ds1631Reset</a>(i2cAddr) == I2C_OK)
45 00038 chip_ok = TRUE;
46 00039 <span class="keywordflow">else</span>
47 00040 chip_ok = FALSE;
48 00041 <span class="comment">// set a default configuration</span>
49 00042 <span class="comment">// (1-shot mode, T_OUT active high, and 12-bit conversion)</span>
50 00043 <a class="code" href="ds1631_8c.html#a2">ds1631SetConfig</a>(i2cAddr,
51 00044 DS1631_CONFIG_1SHOT | DS1631_CONFIG_POL |
52 00045 DS1631_CONFIG_R0 | DS1631_CONFIG_R1);
53 00046 <span class="keywordflow">return</span> chip_ok;
54 00047 }
55 00048
56 <a name="l00049"></a><a class="code" href="ds1631_8h.html#a17">00049</a> u08 <a class="code" href="ds1631_8c.html#a1">ds1631Reset</a>(u08 i2cAddr)
57 00050 {
58 00051 u08 buffer[1];
59 00052 <span class="comment">// return the DS1631 to power-on reset defaults</span>
60 00053 buffer[0] = <a class="code" href="ds1631_8h.html#a7">DS1631_CMD_SWPOR</a>;
61 00054 <span class="keywordflow">return</span> <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, buffer);
62 00055 }
63 00056
64 <a name="l00057"></a><a class="code" href="ds1631_8h.html#a18">00057</a> <span class="keywordtype">void</span> <a class="code" href="ds1631_8c.html#a2">ds1631SetConfig</a>(u08 i2cAddr, u08 config)
65 00058 {
66 00059 u08 buffer[2];
67 00060 <span class="comment">// write the DS1631 configuration byte</span>
68 00061 buffer[0] = <a class="code" href="ds1631_8h.html#a6">DS1631_CMD_ACCESSCONFIG</a>;
69 00062 buffer[1] = config;
70 00063 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 2, buffer);
71 00064 }
72 00065
73 <a name="l00066"></a><a class="code" href="ds1631_8h.html#a19">00066</a> u08 <a class="code" href="ds1631_8c.html#a3">ds1631GetConfig</a>(u08 i2cAddr)
74 00067 {
75 00068 u08 buffer[1];
76 00069 <span class="comment">// write the DS1631 configuration byte</span>
77 00070 buffer[0] = <a class="code" href="ds1631_8h.html#a6">DS1631_CMD_ACCESSCONFIG</a>;
78 00071 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 2, buffer);
79 00072 <a class="code" href="i2c_8c.html#a25">i2cMasterReceiveNI</a>(i2cAddr, 2, buffer);
80 00073 <span class="keywordflow">return</span> buffer[0];
81 00074 }
82 00075
83 <a name="l00076"></a><a class="code" href="ds1631_8h.html#a20">00076</a> <span class="keywordtype">void</span> <a class="code" href="ds1631_8c.html#a4">ds1631StartConvert</a>(u08 i2cAddr)
84 00077 {
85 00078 u08 buffer[1];
86 00079 <span class="comment">// send the DS1631 Start Convert command</span>
87 00080 buffer[0] = <a class="code" href="ds1631_8h.html#a1">DS1631_CMD_STARTCONV</a>;
88 00081 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, buffer);
89 00082 }
90 00083
91 <a name="l00084"></a><a class="code" href="ds1631_8h.html#a21">00084</a> <span class="keywordtype">void</span> <a class="code" href="ds1631_8c.html#a5">ds1631StopConvert</a>(u08 i2cAddr)
92 00085 {
93 00086 u08 buffer[1];
94 00087 <span class="comment">// send the DS1631 Stop Convert command</span>
95 00088 buffer[0] = <a class="code" href="ds1631_8h.html#a2">DS1631_CMD_STOPCONV</a>;
96 00089 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, buffer);
97 00090 }
98 00091
99 <a name="l00092"></a><a class="code" href="ds1631_8h.html#a22">00092</a> s16 <a class="code" href="ds1631_8c.html#a6">ds1631ReadTemp</a>(u08 i2cAddr)
100 00093 {
101 00094 <span class="comment">// read the Temperature register and return the result</span>
102 00095 <span class="keywordflow">return</span> ds1631ReadTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a3">DS1631_CMD_READTEMP</a>);
103 00096 }
104 00097
105 <a name="l00098"></a><a class="code" href="ds1631_8h.html#a23">00098</a> <span class="keywordtype">void</span> <a class="code" href="ds1631_8c.html#a7">ds1631SetTH</a>(u08 i2cAddr, s16 value)
106 00099 {
107 00100 <span class="comment">// write the TH register</span>
108 00101 ds1631WriteTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a4">DS1631_CMD_ACCESSTH</a>, value);
109 00102 }
110 00103
111 <a name="l00104"></a><a class="code" href="ds1631_8h.html#a24">00104</a> <span class="keywordtype">void</span> <a class="code" href="ds1631_8c.html#a8">ds1631SetTL</a>(u08 i2cAddr, s16 value)
112 00105 {
113 00106 <span class="comment">// write the TL register</span>
114 00107 ds1631WriteTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a5">DS1631_CMD_ACCESSTL</a>, value);
115 00108 }
116 00109
117 <a name="l00110"></a><a class="code" href="ds1631_8h.html#a25">00110</a> s16 <a class="code" href="ds1631_8c.html#a9">ds1631GetTH</a>(u08 i2cAddr)
118 00111 {
119 00112 <span class="comment">// read the TH register and return the result</span>
120 00113 <span class="keywordflow">return</span> ds1631ReadTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a4">DS1631_CMD_ACCESSTH</a>);
121 00114 }
122 00115
123 <a name="l00116"></a><a class="code" href="ds1631_8h.html#a26">00116</a> s16 <a class="code" href="ds1631_8c.html#a10">ds1631GetTL</a>(u08 i2cAddr)
124 00117 {
125 00118 <span class="comment">// read the TL register and return the result</span>
126 00119 <span class="keywordflow">return</span> ds1631ReadTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a5">DS1631_CMD_ACCESSTL</a>);
127 00120 }
128 00121
129 00122
130 00123 s16 ds1631ReadTempReg(u08 i2cAddr, u08 cmd)
131 00124 {
132 00125 u08 buffer[2];
133 00126 s16 T;
134 00127
135 00128 <span class="comment">// read the temperature value from the requested register</span>
136 00129 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, &amp;cmd);
137 00130 <a class="code" href="i2c_8c.html#a25">i2cMasterReceiveNI</a>(i2cAddr, 2, buffer);
138 00131 <span class="comment">// pack bytes</span>
139 00132 T = (s16)((buffer[0]&lt;&lt;8) | buffer[1]);
140 00133 <span class="comment">// return result</span>
141 00134 <span class="keywordflow">return</span> T;
142 00135 }
143 00136
144 00137 <span class="keywordtype">void</span> ds1631WriteTempReg(u08 i2cAddr, u08 cmd, s16 value)
145 00138 {
146 00139 u08 buffer[3];
147 00140
148 00141 <span class="comment">// write the requested register with a temperature value</span>
149 00142 buffer[0] = cmd;
150 00143 buffer[1] = value&gt;&gt;8;
151 00144 buffer[2] = value;
152 00145 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 3, buffer);
153 00146 }
154 </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by&nbsp;
155 <a href="http://www.doxygen.org/index.html">
156 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address>
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