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<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 }
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