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3 | <title>Procyon AVRlib: ads7870.c Source File</title> |
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8 | <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> |
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9 | 00002 <span class="comment">//*****************************************************************************</span> |
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10 | 00003 <span class="comment">//</span> |
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11 | 00004 <span class="comment">// File Name : 'ads7870.c'</span> |
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12 | 00005 <span class="comment">// Title : TI ADS7870 12-bit 8ch A/D Converter Driver Library</span> |
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13 | 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2005</span> |
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14 | 00007 <span class="comment">// Created : 2005.07.19</span> |
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15 | 00008 <span class="comment">// Revised : 2005.07.21</span> |
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16 | 00009 <span class="comment">// Version : 0.1</span> |
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17 | 00010 <span class="comment">// Target MCU : Atmel AVR Series</span> |
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18 | 00011 <span class="comment">// Editor Tabs : 4</span> |
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19 | 00012 <span class="comment">//</span> |
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20 | 00013 <span class="comment">// NOTE: This code is currently below version 1.0, and therefore is considered</span> |
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21 | 00014 <span class="comment">// to be lacking in some functionality or documentation, or may not be fully</span> |
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22 | 00015 <span class="comment">// tested. Nonetheless, you can expect most functions to work.</span> |
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23 | 00016 <span class="comment">//</span> |
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24 | 00017 <span class="comment">// This code is distributed under the GNU Public License</span> |
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25 | 00018 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span> |
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26 | 00019 <span class="comment">//</span> |
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27 | 00020 <span class="comment">//*****************************************************************************</span> |
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28 | 00021 |
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29 | 00022 <span class="preprocessor">#include <avr/io.h></span> |
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30 | 00023 <span class="preprocessor">#include <avr/interrupt.h></span> |
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31 | 00024 |
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32 | 00025 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span> |
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33 | 00026 <span class="preprocessor">#include "<a class="code" href="spi_8h.html">spi.h</a>"</span> |
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34 | 00027 <span class="preprocessor">#include "<a class="code" href="ads7870_8h.html">ads7870.h</a>"</span> |
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35 | 00028 |
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36 | 00029 <span class="comment">// global variables</span> |
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37 | 00030 |
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38 | 00031 <span class="comment">// Functions</span> |
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39 | <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>) |
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40 | 00033 { |
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41 | 00034 <span class="comment">// initialize spi interface</span> |
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42 | 00035 spiInit(); |
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43 | 00036 <span class="comment">// switch to f/4 bitrate</span> |
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44 | 00037 cbi(SPCR, SPR0); |
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45 | 00038 cbi(SPCR, SPR1); |
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46 | 00039 <span class="comment">//sbi(SPSR, SPI2X);</span> |
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47 | 00040 |
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48 | 00041 <span class="comment">// setup chip select</span> |
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49 | 00042 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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50 | 00043 sbi(ADS7870_CS_DDR, ADS7870_CS_PIN); |
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51 | 00044 |
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52 | 00045 <span class="comment">// check ID register</span> |
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53 | 00046 <span class="keywordflow">if</span>(<a class="code" href="group__ads7870.html#ga4">ads7870ReadReg</a>(ADS7870_ID) != ADS7870_ID_VALUE) |
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54 | 00047 <span class="keywordflow">return</span> 0; |
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55 | 00048 |
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56 | 00049 <span class="comment">// setup reference and buffer</span> |
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57 | 00050 <a class="code" href="group__ads7870.html#ga5">ads7870WriteReg</a>(ADS7870_REFOSC, ADS7870_REFOSC_OSCE | ADS7870_REFOSC_REFE | ADS7870_REFOSC_BUFE); |
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58 | 00051 |
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59 | 00052 <span class="comment">// return success</span> |
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60 | 00053 <span class="keywordflow">return</span> 1; |
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61 | 00054 } |
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62 | 00055 |
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63 | <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) |
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64 | 00057 { |
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65 | 00058 <span class="comment">// set single-ended channel bit</span> |
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66 | 00059 channel |= ADS7870_CH_SINGLE_ENDED; |
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67 | 00060 <span class="comment">// do conversion</span> |
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68 | 00061 <span class="keywordflow">return</span> <a class="code" href="group__ads7870.html#ga3">ads7870ConvertRaw</a>(channel); |
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69 | 00062 } |
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70 | 00063 |
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71 | <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) |
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72 | 00065 { |
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73 | 00066 <span class="comment">// clear single-ended channel bit</span> |
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74 | 00067 channel &= ~ADS7870_CH_SINGLE_ENDED; |
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75 | 00068 <span class="comment">// do conversion</span> |
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76 | 00069 <span class="keywordflow">return</span> <a class="code" href="group__ads7870.html#ga3">ads7870ConvertRaw</a>(channel); |
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77 | 00070 } |
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78 | 00071 |
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79 | <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) |
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80 | 00073 { |
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81 | 00074 s16 result; |
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82 | 00075 <span class="comment">// assert chip select</span> |
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83 | 00076 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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84 | 00077 <span class="comment">// start conversion</span> |
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85 | 00078 spiTransferByte(ADS7870_CONVERT | channel); |
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86 | 00079 <span class="comment">// wait for completion</span> |
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87 | 00080 <span class="keywordflow">while</span>( <a class="code" href="group__ads7870.html#ga4">ads7870ReadReg</a>(ADS7870_GAINMUX) & ADS7870_GAINMUX_CNVBSY); |
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88 | 00081 <span class="comment">// assert chip select</span> |
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89 | 00082 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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90 | 00083 <span class="comment">// read result</span> |
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91 | 00084 spiTransferByte(ADS7870_REG_READ | ADS7870_REG_16BIT | ADS7870_RESULTHI); |
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92 | 00085 result = spiTransferByte(0x00)<<8; |
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93 | 00086 result |= spiTransferByte(0x00); |
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94 | 00087 <span class="comment">// release chip select</span> |
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95 | 00088 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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96 | 00089 <span class="comment">// return result</span> |
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97 | 00090 <span class="keywordflow">return</span> result; |
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98 | 00091 } |
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99 | 00092 |
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100 | <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) |
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101 | 00094 { |
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102 | 00095 u08 data; |
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103 | 00096 <span class="comment">// assert chip select</span> |
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104 | 00097 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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105 | 00098 <span class="comment">// issue reg read command</span> |
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106 | 00099 spiTransferByte(ADS7870_REG_READ | reg); |
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107 | 00100 <span class="comment">// read data</span> |
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108 | 00101 data = spiTransferByte(0x00); |
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109 | 00102 <span class="comment">// release chip select</span> |
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110 | 00103 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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111 | 00104 <span class="comment">// return data</span> |
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112 | 00105 <span class="keywordflow">return</span> data; |
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113 | 00106 } |
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114 | 00107 |
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115 | <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) |
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116 | 00109 { |
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117 | 00110 <span class="comment">// assert chip select</span> |
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118 | 00111 cbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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119 | 00112 <span class="comment">// issue reg write command</span> |
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120 | 00113 spiTransferByte(ADS7870_REG_WRITE | reg); |
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121 | 00114 <span class="comment">// write data</span> |
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122 | 00115 spiTransferByte(value); |
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123 | 00116 <span class="comment">// release chip select</span> |
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124 | 00117 sbi(ADS7870_CS_PORT, ADS7870_CS_PIN); |
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125 | 00118 } |
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126 | 00119 |
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127 | </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by |
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128 | <a href="http://www.doxygen.org/index.html"> |
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129 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address> |
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