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<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>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name : 'ds1631.c'</span>
00005 <span class="comment">// Title : Dallas DS1631 Temperature Sensor Driver Library</span>
00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2004</span>
00007 <span class="comment">// Created : 2004.02.10</span>
00008 <span class="comment">// Revised : 2004.02.19</span>
00009 <span class="comment">// Version : 0.1</span>
00010 <span class="comment">// Target MCU : Atmel AVR Series</span>
00011 <span class="comment">// Editor Tabs : 4</span>
00012 <span class="comment">//</span>
00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span>
00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span>
00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span>
00016 <span class="comment">//</span>
00017 <span class="comment">// This code is distributed under the GNU Public License</span>
00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span>
00019 <span class="comment">//</span>
00020 <span class="comment">//*****************************************************************************</span>
00021
00022 <span class="preprocessor">#include <avr/io.h></span>
00023 <span class="preprocessor">#include <avr/interrupt.h></span>
00024
00025 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>
00026 <span class="preprocessor">#include "<a class="code" href="timer_8h.html">timer.h</a>"</span>
00027 <span class="preprocessor">#include "<a class="code" href="i2c_8h.html">i2c.h</a>"</span>
00028 <span class="preprocessor">#include "<a class="code" href="ds1631_8h.html">ds1631.h</a>"</span>
00029
00030 <span class="comment">// global variables</span>
00031
00032 <span class="comment">// Functions</span>
<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)
00034 {
00035 u08 chip_ok;
00036 <span class="comment">// issue a reset</span>
00037 <span class="keywordflow">if</span>(<a class="code" href="ds1631_8c.html#a1">ds1631Reset</a>(i2cAddr) == I2C_OK)
00038 chip_ok = TRUE;
00039 <span class="keywordflow">else</span>
00040 chip_ok = FALSE;
00041 <span class="comment">// set a default configuration</span>
00042 <span class="comment">// (1-shot mode, T_OUT active high, and 12-bit conversion)</span>
00043 <a class="code" href="ds1631_8c.html#a2">ds1631SetConfig</a>(i2cAddr,
00044 DS1631_CONFIG_1SHOT | DS1631_CONFIG_POL |
00045 DS1631_CONFIG_R0 | DS1631_CONFIG_R1);
00046 <span class="keywordflow">return</span> chip_ok;
00047 }
00048
<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)
00050 {
00051 u08 buffer[1];
00052 <span class="comment">// return the DS1631 to power-on reset defaults</span>
00053 buffer[0] = <a class="code" href="ds1631_8h.html#a7">DS1631_CMD_SWPOR</a>;
00054 <span class="keywordflow">return</span> <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, buffer);
00055 }
00056
<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)
00058 {
00059 u08 buffer[2];
00060 <span class="comment">// write the DS1631 configuration byte</span>
00061 buffer[0] = <a class="code" href="ds1631_8h.html#a6">DS1631_CMD_ACCESSCONFIG</a>;
00062 buffer[1] = config;
00063 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 2, buffer);
00064 }
00065
<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)
00067 {
00068 u08 buffer[1];
00069 <span class="comment">// write the DS1631 configuration byte</span>
00070 buffer[0] = <a class="code" href="ds1631_8h.html#a6">DS1631_CMD_ACCESSCONFIG</a>;
00071 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 2, buffer);
00072 <a class="code" href="i2c_8c.html#a25">i2cMasterReceiveNI</a>(i2cAddr, 2, buffer);
00073 <span class="keywordflow">return</span> buffer[0];
00074 }
00075
<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)
00077 {
00078 u08 buffer[1];
00079 <span class="comment">// send the DS1631 Start Convert command</span>
00080 buffer[0] = <a class="code" href="ds1631_8h.html#a1">DS1631_CMD_STARTCONV</a>;
00081 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, buffer);
00082 }
00083
<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)
00085 {
00086 u08 buffer[1];
00087 <span class="comment">// send the DS1631 Stop Convert command</span>
00088 buffer[0] = <a class="code" href="ds1631_8h.html#a2">DS1631_CMD_STOPCONV</a>;
00089 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, buffer);
00090 }
00091
<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)
00093 {
00094 <span class="comment">// read the Temperature register and return the result</span>
00095 <span class="keywordflow">return</span> ds1631ReadTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a3">DS1631_CMD_READTEMP</a>);
00096 }
00097
<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)
00099 {
00100 <span class="comment">// write the TH register</span>
00101 ds1631WriteTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a4">DS1631_CMD_ACCESSTH</a>, value);
00102 }
00103
<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)
00105 {
00106 <span class="comment">// write the TL register</span>
00107 ds1631WriteTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a5">DS1631_CMD_ACCESSTL</a>, value);
00108 }
00109
<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)
00111 {
00112 <span class="comment">// read the TH register and return the result</span>
00113 <span class="keywordflow">return</span> ds1631ReadTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a4">DS1631_CMD_ACCESSTH</a>);
00114 }
00115
<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)
00117 {
00118 <span class="comment">// read the TL register and return the result</span>
00119 <span class="keywordflow">return</span> ds1631ReadTempReg(i2cAddr, <a class="code" href="ds1631_8h.html#a5">DS1631_CMD_ACCESSTL</a>);
00120 }
00121
00122
00123 s16 ds1631ReadTempReg(u08 i2cAddr, u08 cmd)
00124 {
00125 u08 buffer[2];
00126 s16 T;
00127
00128 <span class="comment">// read the temperature value from the requested register</span>
00129 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, &cmd);
00130 <a class="code" href="i2c_8c.html#a25">i2cMasterReceiveNI</a>(i2cAddr, 2, buffer);
00131 <span class="comment">// pack bytes</span>
00132 T = (s16)((buffer[0]<<8) | buffer[1]);
00133 <span class="comment">// return result</span>
00134 <span class="keywordflow">return</span> T;
00135 }
00136
00137 <span class="keywordtype">void</span> ds1631WriteTempReg(u08 i2cAddr, u08 cmd, s16 value)
00138 {
00139 u08 buffer[3];
00140
00141 <span class="comment">// write the requested register with a temperature value</span>
00142 buffer[0] = cmd;
00143 buffer[1] = value>>8;
00144 buffer[2] = value;
00145 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 3, buffer);
00146 }
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