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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon AVRlib: ads7828.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.2 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div><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>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'ads7828.c'</span>00005 <span class="comment">// Title : TI ADS7828 12-bit 8ch A/D Converter 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="i2c_8h.html">i2c.h</a>"</span>00027 <span class="preprocessor">#include "<a class="code" href="ads7828_8h.html">ads7828.h</a>"</span>00028 00029 <span class="comment">// global variables</span>00030 u08 Ads7282RefMode;00031 00032 <span class="comment">// Functions</span><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)00034 {00035 u08 channel = 0x80;00036 00037 <span class="comment">// setup default A/D voltage reference</span>00038 <a class="code" href="group__ads7828.html#ga1">ads7828SetReference</a>(0);00039 00040 <span class="comment">// issue a convserion to test chip presence</span>00041 <span class="comment">// return TRUE if chip detected</span>00042 <span class="comment">// return FALSE if chip does not respond</span>00043 <span class="keywordflow">return</span> (<a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, &channel) == I2C_OK);00044 }00045 <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)00047 {00048 <span class="comment">// re-order channel bits for</span>00049 <span class="comment">// logical single-ended channel selection</span>00050 <span class="comment">// channel bit0 -> C2</span>00051 <span class="comment">// channel bit1 -> C0</span>00052 <span class="comment">// channel bit2 -> C1</span>00053 channel = (((channel>>1) | (channel&0x01)<<2)<<4) | <a class="code" href="group__ads7828.html#ga11">ADS7828_CMD_SD</a>;00054 <span class="comment">// do conversion</span>00055 <span class="keywordflow">return</span> <a class="code" href="group__ads7828.html#ga4">ads7828ConvertRaw</a>(i2cAddr, channel);00056 }00057 <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)00059 {00060 <span class="comment">// clear single-ended channel bit</span>00061 channel = (channel&0x07)<<4;00062 <span class="comment">// do conversion</span>00063 <span class="keywordflow">return</span> <a class="code" href="group__ads7828.html#ga4">ads7828ConvertRaw</a>(i2cAddr, channel);00064 }00065 <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)00067 {00068 u08 buffer[2];00069 <span class="comment">// combine raw channel and reference bits</span>00070 channel &= 0xF0;00071 channel |= Ads7282RefMode;00072 <span class="comment">// start conversion on requested channel</span>00073 <a class="code" href="i2c_8c.html#a24">i2cMasterSendNI</a>(i2cAddr, 1, &channel);00074 <span class="comment">// retrieve conversion result</span>00075 <a class="code" href="i2c_8c.html#a25">i2cMasterReceiveNI</a>(i2cAddr, 2, buffer);00076 <span class="comment">// pack bytes and return result</span>00077 <span class="keywordflow">return</span> ((buffer[0]<<8) | buffer[1]);00078 }00079 <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)00081 {00082 <span class="keywordflow">if</span>(ref)00083 {00084 <span class="comment">// use internal reference</span>00085 Ads7282RefMode = <a class="code" href="group__ads7828.html#ga22">ADS7828_CMD_PDMODE2</a>;00086 }00087 <span class="keywordflow">else</span>00088 {00089 <span class="comment">// use external reference</span>00090 Ads7282RefMode = <a class="code" href="group__ads7828.html#ga20">ADS7828_CMD_PDMODE0</a>;00091 }00092 }</pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address></body></html>?? 快捷鍵說明
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