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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: ads7870.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>ads7870.c</h1><a href="ads7870_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file ads7870.c \brief TI ADS7870 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 : 'ads7870.c'</span>00005 <span class="comment">// Title : TI ADS7870 12-bit 8ch A/D Converter Driver Library</span>00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2005</span>00007 <span class="comment">// Created : 2005.07.19</span>00008 <span class="comment">// Revised : 2005.07.21</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="spi_8h.html">spi.h</a>"</span>00027 <span class="preprocessor">#include "<a class="code" href="ads7870_8h.html">ads7870.h</a>"</span>00028 00029 <span class="comment">// global variables</span>00030 00031 <span class="comment">// Functions</span><a name="l00032"></a><a class="code" href="group__ads7870.html#ga0">00032</a> u08 <a class="code" href="group__ads7870.html#ga0">ads7870Init</a>(<span class="keywordtype">void</span>)00033 {00034 <span class="comment">// initialize spi interface</span>00035 spiInit();00036 <span class="comment">// switch to f/4 bitrate</span>00037 cbi(SPCR, SPR0);00038 cbi(SPCR, SPR1);00039 <span class="comment">//sbi(SPSR, SPI2X);</span>00040 00041 <span class="comment">// setup chip select</span>00042 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00043 sbi(ADS7870_CS_DDR, ADS7870_CS_PIN);00044 00045 <span class="comment">// check ID register</span>00046 <span class="keywordflow">if</span>(<a class="code" href="group__ads7870.html#ga4">ads7870ReadReg</a>(ADS7870_ID) != ADS7870_ID_VALUE)00047 <span class="keywordflow">return</span> 0;00048 00049 <span class="comment">// setup reference and buffer</span>00050 <a class="code" href="group__ads7870.html#ga5">ads7870WriteReg</a>(ADS7870_REFOSC, ADS7870_REFOSC_OSCE | ADS7870_REFOSC_REFE | ADS7870_REFOSC_BUFE);00051 00052 <span class="comment">// return success</span>00053 <span class="keywordflow">return</span> 1;00054 }00055 <a name="l00056"></a><a class="code" href="group__ads7870.html#ga1">00056</a> s16 <a class="code" href="group__ads7870.html#ga1">ads7870Convert</a>(u08 channel)00057 {00058 <span class="comment">// set single-ended channel bit</span>00059 channel |= ADS7870_CH_SINGLE_ENDED;00060 <span class="comment">// do conversion</span>00061 <span class="keywordflow">return</span> <a class="code" href="group__ads7870.html#ga3">ads7870ConvertRaw</a>(channel);00062 }00063 <a name="l00064"></a><a class="code" href="group__ads7870.html#ga2">00064</a> s16 <a class="code" href="group__ads7870.html#ga2">ads7870ConvertDiff</a>(u08 channel)00065 {00066 <span class="comment">// clear single-ended channel bit</span>00067 channel &= ~ADS7870_CH_SINGLE_ENDED;00068 <span class="comment">// do conversion</span>00069 <span class="keywordflow">return</span> <a class="code" href="group__ads7870.html#ga3">ads7870ConvertRaw</a>(channel);00070 }00071 <a name="l00072"></a><a class="code" href="group__ads7870.html#ga3">00072</a> s16 <a class="code" href="group__ads7870.html#ga3">ads7870ConvertRaw</a>(u08 channel)00073 {00074 s16 result;00075 <span class="comment">// assert chip select</span>00076 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00077 <span class="comment">// start conversion</span>00078 spiTransferByte(ADS7870_CONVERT | channel);00079 <span class="comment">// wait for completion</span>00080 <span class="keywordflow">while</span>( <a class="code" href="group__ads7870.html#ga4">ads7870ReadReg</a>(ADS7870_GAINMUX) & ADS7870_GAINMUX_CNVBSY);00081 <span class="comment">// assert chip select</span>00082 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00083 <span class="comment">// read result</span>00084 spiTransferByte(ADS7870_REG_READ | ADS7870_REG_16BIT | ADS7870_RESULTHI);00085 result = spiTransferByte(0x00)<<8;00086 result |= spiTransferByte(0x00);00087 <span class="comment">// release chip select</span>00088 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00089 <span class="comment">// return result</span>00090 <span class="keywordflow">return</span> result;00091 }00092 <a name="l00093"></a><a class="code" href="group__ads7870.html#ga4">00093</a> u08 <a class="code" href="group__ads7870.html#ga4">ads7870ReadReg</a>(u08 reg)00094 {00095 u08 data;00096 <span class="comment">// assert chip select</span>00097 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00098 <span class="comment">// issue reg read command</span>00099 spiTransferByte(ADS7870_REG_READ | reg);00100 <span class="comment">// read data</span>00101 data = spiTransferByte(0x00);00102 <span class="comment">// release chip select</span>00103 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00104 <span class="comment">// return data</span>00105 <span class="keywordflow">return</span> data;00106 }00107 <a name="l00108"></a><a class="code" href="group__ads7870.html#ga5">00108</a> <span class="keywordtype">void</span> <a class="code" href="group__ads7870.html#ga5">ads7870WriteReg</a>(u08 reg, u08 value)00109 {00110 <span class="comment">// assert chip select</span>00111 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00112 <span class="comment">// issue reg write command</span>00113 spiTransferByte(ADS7870_REG_WRITE | reg);00114 <span class="comment">// write data</span>00115 spiTransferByte(value);00116 <span class="comment">// release chip select</span>00117 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN);00118 }00119 </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>⌨️ 快捷键说明
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