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<title>Procyon AVRlib: TI ADS7828 I2C A/D Converter Driver (ads7828.c)</title>
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<h1>TI ADS7828 I2C A/D Converter Driver (ads7828.c)<br>
<small>
[<a class="el" href="group__driver__hw.html">Drivers (for external hardware)</a>]</small>
</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
<div class="fragment"><pre class="fragment"><span class="preprocessor"> #include "<a class="code" href="ads7828_8h.html">ads7828.h</a>"</span>
</pre></div> <dl compact><dt><b>Overview</b></dt><dd>This library provides high-level functions for accessing the Texas Instruments ADS7828 I2C A/D Converter.</dd></dl>
The basic specs of the ADS7828 are:<ul>
<li>12-bit results</li><li>8 input channels</li><li>up to 50KHz conversion rate</li><li>External reference or internal 2.5V reference </li></ul>
<p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga5" doxytag="ads7828::ADS7828_I2C_ADDR"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga5">ADS7828_I2C_ADDR</a> 0x90</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Base I2C address of ADS7828 devices. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga6" doxytag="ads7828::ADS7828_CMD_PD0"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga6">ADS7828_CMD_PD0</a> 0x04</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Power-down bit 0. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga7" doxytag="ads7828::ADS7828_CMD_PD1"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga7">ADS7828_CMD_PD1</a> 0x08</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Power-down bit 1. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga8" doxytag="ads7828::ADS7828_CMD_C0"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga8">ADS7828_CMD_C0</a> 0x10</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Channel Select bit 0. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga9" doxytag="ads7828::ADS7828_CMD_C1"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga9">ADS7828_CMD_C1</a> 0x20</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Channel Select bit 1. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga10" doxytag="ads7828::ADS7828_CMD_C2"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga10">ADS7828_CMD_C2</a> 0x40</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Channel Select bit 2. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga11" doxytag="ads7828::ADS7828_CMD_SD"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga11">ADS7828_CMD_SD</a> 0x80</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Single-ended/Differential Select bit. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga12" doxytag="ads7828::ADS7828_CMD_CH0"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga12">ADS7828_CMD_CH0</a> 0x00</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 0. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga13" doxytag="ads7828::ADS7828_CMD_CH1"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga13">ADS7828_CMD_CH1</a> 0x04</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 1. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga14" doxytag="ads7828::ADS7828_CMD_CH2"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga14">ADS7828_CMD_CH2</a> 0x01</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 2. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga15" doxytag="ads7828::ADS7828_CMD_CH3"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga15">ADS7828_CMD_CH3</a> 0x05</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 3. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga16" doxytag="ads7828::ADS7828_CMD_CH4"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga16">ADS7828_CMD_CH4</a> 0x02</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 4. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga17" doxytag="ads7828::ADS7828_CMD_CH5"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga17">ADS7828_CMD_CH5</a> 0x06</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 5. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga18" doxytag="ads7828::ADS7828_CMD_CH6"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga18">ADS7828_CMD_CH6</a> 0x03</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 6. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga19" doxytag="ads7828::ADS7828_CMD_CH7"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga19">ADS7828_CMD_CH7</a> 0x07</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Convert Channel 7. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga20" doxytag="ads7828::ADS7828_CMD_PDMODE0"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga20">ADS7828_CMD_PDMODE0</a> 0x00</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Power-down Mode 0. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga21" doxytag="ads7828::ADS7828_CMD_PDMODE1"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga21">ADS7828_CMD_PDMODE1</a> 0x04</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Power-down Mode 1. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga22" doxytag="ads7828::ADS7828_CMD_PDMODE2"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga22">ADS7828_CMD_PDMODE2</a> 0x08</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Power-down Mode 2. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga23" doxytag="ads7828::ADS7828_CMD_PDMODE3"></a>
#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga23">ADS7828_CMD_PDMODE3</a> 0x0C</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">ADS7828 Power-down Mode 3. <br></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">u08 </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga0">ads7828Init</a> (u08 i2cAddr)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga1">ads7828SetReference</a> (u08 ref)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga2" doxytag="ads7828::ads7828Convert"></a>
u16 </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga2">ads7828Convert</a> (u08 i2cAddr, u08 channel)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Begin single-ended conversion on given logical channel#, and return result. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga3" doxytag="ads7828::ads7828ConvertDiff"></a>
u16 </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga3">ads7828ConvertDiff</a> (u08 i2cAddr, u08 channel)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Begin differential conversion on given channel pair, and return result. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ga4" doxytag="ads7828::ads7828ConvertRaw"></a>
u16 </td><td class="memItemRight" valign="bottom"><a class="el" href="group__ads7828.html#ga4">ads7828ConvertRaw</a> (u08 i2cAddr, u08 channel)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Begin conversion on given raw channel#, and return result. <br></td></tr>
</table>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="ga0" doxytag="ads7828.h::ads7828Init"></a><p>
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<td class="md" nowrap valign="top">u08 ads7828Init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">u08 </td>
<td class="mdname1" valign="top" nowrap> <em>i2cAddr</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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<p>
Initialize the ADS7828 chip. Returns: TRUE if successful, FALSE if unsuccessful (chip not present).
<p>
Definition at line <a class="el" href="ads7828_8c-source.html#l00033">33</a> of file <a class="el" href="ads7828_8c-source.html">ads7828.c</a>. </td>
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<a class="anchor" name="ga1" doxytag="ads7828.h::ads7828SetReference"></a><p>
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<td class="md" nowrap valign="top">void ads7828SetReference </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">u08 </td>
<td class="mdname1" valign="top" nowrap> <em>ref</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
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<p>
Set the voltage reference to use for A/D conversion.<ul>
<li>ref = 0 => External reference voltage on Ref pin.</li><li>ref = 1 => Internal 2.5V reference voltage (Ref pin left open). </li></ul>
<p>
Definition at line <a class="el" href="ads7828_8c-source.html#l00080">80</a> of file <a class="el" href="ads7828_8c-source.html">ads7828.c</a>. </td>
</tr>
</table>
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