RISCI_ATOM
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reform
mirror de https://github.com/mntmn/reform.git


			
				
					
						
						
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<title>AVR-GCC Libraries: I2C Master library</title>
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<a href="#define-members">Macros</a> &#124;
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<div class="title">I2C Master library</div>  </div>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>I2C (TWI) Master Software Library. </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="i2cmaster_8h.html">i2cmaster.h</a>&gt;</span> </div>
</div><!-- fragment --><p>Basic routines for communicating with I2C slave devices. This single master implementation is limited to one bus master on the I2C bus.</p>
<p>This I2c library is implemented as a compact assembler software implementation of the I2C protocol which runs on any AVR (i2cmaster.S) and as a TWI hardware interface for all AVR with built-in TWI hardware (twimaster.c). Since the API for these two implementations is exactly the same, an application can be linked either against the software I2C implementation or the hardware I2C implementation.</p>
<p>Use 4.7k pull-up resistor on the SDA and SCL pin.</p>
<p>Adapt the SCL and SDA port and pin definitions and eventually the delay routine in the module i2cmaster.S to your target when using the software I2C implementation !</p>
<p>Adjust the CPU clock frequence F_CPU in twimaster.c or in the Makfile when using the TWI hardware implementaion.</p>
<dl class="section note"><dt>Note</dt><dd>The module i2cmaster.S is based on the Atmel Application Note AVR300, corrected and adapted to GNU assembler and AVR-GCC C call interface. Replaced the incorrect quarter period delays found in AVR300 with half period delays.</dd></dl>
<dl class="section author"><dt>Author</dt><dd>Peter Fleury <a href="#" onclick="location.href='mai'+'lto:'+'pfl'+'eu'+'ry@'+'gm'+'x.c'+'h'; return false;">pfleu<span style="display: none;">.nosp@m.</span>ry@g<span style="display: none;">.nosp@m.</span>mx.ch</a> <a href="http://tinyurl.com/peterfleury">http://tinyurl.com/peterfleury</a> </dd></dl>
<dl class="section copyright"><dt>Copyright</dt><dd>(C) 2015 Peter Fleury, GNU General Public License Version 3</dd></dl>
<dl class="section user"><dt>API Usage Example</dt><dd>The following code shows typical usage of this library, see example test_i2cmaster.c</dd></dl>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="i2cmaster_8h.html">i2cmaster.h</a>&gt;</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define Dev24C02  0xA2      // device address of EEPROM 24C02, see datasheet</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">    <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> ret;</div>
<div class="line"></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#ga5730d9445429351b9f750084c5cb5aae">i2c_init</a>();                             <span class="comment">// initialize I2C library</span></div>
<div class="line"></div>
<div class="line">    <span class="comment">// write 0x75 to EEPROM address 5 (Byte Write) </span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gaee3747a01738315cd5580588994b6c28">i2c_start_wait</a>(Dev24C02+<a class="code" href="group__pfleury__ic2master.html#ga9536bf85bced4f4e549a82fb18eb6140">I2C_WRITE</a>);     <span class="comment">// set device address and write mode</span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gadd947aade44ed6b7f92265f9dec4a711">i2c_write</a>(0x05);                        <span class="comment">// write address = 5</span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gadd947aade44ed6b7f92265f9dec4a711">i2c_write</a>(0x75);                        <span class="comment">// write value 0x75 to EEPROM</span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gad35d4e4f52ca74b503d5e5e1e0a3f5f3">i2c_stop</a>();                             <span class="comment">// set stop conditon = release bus</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line">    <span class="comment">// read previously written value back from EEPROM address 5 </span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gaee3747a01738315cd5580588994b6c28">i2c_start_wait</a>(Dev24C02+<a class="code" href="group__pfleury__ic2master.html#ga9536bf85bced4f4e549a82fb18eb6140">I2C_WRITE</a>);     <span class="comment">// set device address and write mode</span></div>
<div class="line"></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gadd947aade44ed6b7f92265f9dec4a711">i2c_write</a>(0x05);                        <span class="comment">// write address = 5</span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#ga93a9461da34295250ba935bbce9a980d">i2c_rep_start</a>(Dev24C02+<a class="code" href="group__pfleury__ic2master.html#gab5c0fbe837494c5f9130a5914854250d">I2C_READ</a>);       <span class="comment">// set device address and read mode</span></div>
<div class="line"></div>
<div class="line">    ret = <a class="code" href="group__pfleury__ic2master.html#gad89e839fc17b05fbb5dd79897c55234e">i2c_readNak</a>();                    <span class="comment">// read one byte from EEPROM</span></div>
<div class="line">    <a class="code" href="group__pfleury__ic2master.html#gad35d4e4f52ca74b503d5e5e1e0a3f5f3">i2c_stop</a>();</div>
<div class="line"></div>
<div class="line">    <span class="keywordflow">for</span>(;;);</div>
<div class="line">}</div>
</div><!-- fragment --> <table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:gab5c0fbe837494c5f9130a5914854250d"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#gab5c0fbe837494c5f9130a5914854250d">I2C_READ</a>&#160;&#160;&#160;1</td></tr>
<tr class="separator:gab5c0fbe837494c5f9130a5914854250d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga9536bf85bced4f4e549a82fb18eb6140"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#ga9536bf85bced4f4e549a82fb18eb6140">I2C_WRITE</a>&#160;&#160;&#160;0</td></tr>
<tr class="separator:ga9536bf85bced4f4e549a82fb18eb6140"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gad33503cf741851d1bca1d274e9001796"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gad33503cf741851d1bca1d274e9001796"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><b>i2c_read</b>(ack)&#160;&#160;&#160;(ack) ? <a class="el" href="group__pfleury__ic2master.html#ga32ac22052d55f93375b024192217db21">i2c_readAck</a>() : <a class="el" href="group__pfleury__ic2master.html#gad89e839fc17b05fbb5dd79897c55234e">i2c_readNak</a>();</td></tr>
<tr class="separator:gad33503cf741851d1bca1d274e9001796"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga5730d9445429351b9f750084c5cb5aae"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#ga5730d9445429351b9f750084c5cb5aae">i2c_init</a> (void)</td></tr>
<tr class="memdesc:ga5730d9445429351b9f750084c5cb5aae"><td class="mdescLeft">&#160;</td><td class="mdescRight">initialize the I2C master interace. Need to be called only once  <a href="#ga5730d9445429351b9f750084c5cb5aae">More...</a><br /></td></tr>
<tr class="separator:ga5730d9445429351b9f750084c5cb5aae"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gad35d4e4f52ca74b503d5e5e1e0a3f5f3"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#gad35d4e4f52ca74b503d5e5e1e0a3f5f3">i2c_stop</a> (void)</td></tr>
<tr class="memdesc:gad35d4e4f52ca74b503d5e5e1e0a3f5f3"><td class="mdescLeft">&#160;</td><td class="mdescRight">Terminates the data transfer and releases the I2C bus.  <a href="#gad35d4e4f52ca74b503d5e5e1e0a3f5f3">More...</a><br /></td></tr>
<tr class="separator:gad35d4e4f52ca74b503d5e5e1e0a3f5f3"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga58dfadce0c2fee4bfac01df6cd2b4477"><td class="memItemLeft" align="right" valign="top">unsigned char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#ga58dfadce0c2fee4bfac01df6cd2b4477">i2c_start</a> (unsigned char addr)</td></tr>
<tr class="memdesc:ga58dfadce0c2fee4bfac01df6cd2b4477"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issues a start condition and sends address and transfer direction.  <a href="#ga58dfadce0c2fee4bfac01df6cd2b4477">More...</a><br /></td></tr>
<tr class="separator:ga58dfadce0c2fee4bfac01df6cd2b4477"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga93a9461da34295250ba935bbce9a980d"><td class="memItemLeft" align="right" valign="top">unsigned char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#ga93a9461da34295250ba935bbce9a980d">i2c_rep_start</a> (unsigned char addr)</td></tr>
<tr class="memdesc:ga93a9461da34295250ba935bbce9a980d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issues a repeated start condition and sends address and transfer direction.  <a href="#ga93a9461da34295250ba935bbce9a980d">More...</a><br /></td></tr>
<tr class="separator:ga93a9461da34295250ba935bbce9a980d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaee3747a01738315cd5580588994b6c28"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#gaee3747a01738315cd5580588994b6c28">i2c_start_wait</a> (unsigned char addr)</td></tr>
<tr class="memdesc:gaee3747a01738315cd5580588994b6c28"><td class="mdescLeft">&#160;</td><td class="mdescRight">Issues a start condition and sends address and transfer direction.  <a href="#gaee3747a01738315cd5580588994b6c28">More...</a><br /></td></tr>
<tr class="separator:gaee3747a01738315cd5580588994b6c28"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gadd947aade44ed6b7f92265f9dec4a711"><td class="memItemLeft" align="right" valign="top">unsigned char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#gadd947aade44ed6b7f92265f9dec4a711">i2c_write</a> (unsigned char data)</td></tr>
<tr class="memdesc:gadd947aade44ed6b7f92265f9dec4a711"><td class="mdescLeft">&#160;</td><td class="mdescRight">Send one byte to I2C device.  <a href="#gadd947aade44ed6b7f92265f9dec4a711">More...</a><br /></td></tr>
<tr class="separator:gadd947aade44ed6b7f92265f9dec4a711"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga32ac22052d55f93375b024192217db21"><td class="memItemLeft" align="right" valign="top">unsigned char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#ga32ac22052d55f93375b024192217db21">i2c_readAck</a> (void)</td></tr>
<tr class="memdesc:ga32ac22052d55f93375b024192217db21"><td class="mdescLeft">&#160;</td><td class="mdescRight">read one byte from the I2C device, request more data from device  <a href="#ga32ac22052d55f93375b024192217db21">More...</a><br /></td></tr>
<tr class="separator:ga32ac22052d55f93375b024192217db21"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gad89e839fc17b05fbb5dd79897c55234e"><td class="memItemLeft" align="right" valign="top">unsigned char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#gad89e839fc17b05fbb5dd79897c55234e">i2c_readNak</a> (void)</td></tr>
<tr class="memdesc:gad89e839fc17b05fbb5dd79897c55234e"><td class="mdescLeft">&#160;</td><td class="mdescRight">read one byte from the I2C device, read is followed by a stop condition  <a href="#gad89e839fc17b05fbb5dd79897c55234e">More...</a><br /></td></tr>
<tr class="separator:gad89e839fc17b05fbb5dd79897c55234e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga669c0357614a79b3b35ae815f6f50e82"><td class="memItemLeft" align="right" valign="top">unsigned char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__pfleury__ic2master.html#ga669c0357614a79b3b35ae815f6f50e82">i2c_read</a> (unsigned char ack)</td></tr>
<tr class="memdesc:ga669c0357614a79b3b35ae815f6f50e82"><td class="mdescLeft">&#160;</td><td class="mdescRight">read one byte from the I2C device  <a href="#ga669c0357614a79b3b35ae815f6f50e82">More...</a><br /></td></tr>
<tr class="separator:ga669c0357614a79b3b35ae815f6f50e82"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a class="anchor" id="gab5c0fbe837494c5f9130a5914854250d"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define I2C_READ&#160;&#160;&#160;1</td>
        </tr>
      </table>
</div><div class="memdoc">
<p>defines the data direction (reading from I2C device) in <a class="el" href="group__pfleury__ic2master.html#ga58dfadce0c2fee4bfac01df6cd2b4477" title="Issues a start condition and sends address and transfer direction. ">i2c_start()</a>,<a class="el" href="group__pfleury__ic2master.html#ga93a9461da34295250ba935bbce9a980d" title="Issues a repeated start condition and sends address and transfer direction. ">i2c_rep_start()</a> </p>

</div>
</div>
<a class="anchor" id="ga9536bf85bced4f4e549a82fb18eb6140"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define I2C_WRITE&#160;&#160;&#160;0</td>
        </tr>
      </table>
</div><div class="memdoc">
<p>defines the data direction (writing to I2C device) in <a class="el" href="group__pfleury__ic2master.html#ga58dfadce0c2fee4bfac01df6cd2b4477" title="Issues a start condition and sends address and transfer direction. ">i2c_start()</a>,<a class="el" href="group__pfleury__ic2master.html#ga93a9461da34295250ba935bbce9a980d" title="Issues a repeated start condition and sends address and transfer direction. ">i2c_rep_start()</a> </p>

</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga5730d9445429351b9f750084c5cb5aae"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void i2c_init </td>
          <td>(</td>
          <td class="paramtype">void&#160;</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>initialize the I2C master interace. Need to be called only once </p>
<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>

</div>
</div>
<a class="anchor" id="gad35d4e4f52ca74b503d5e5e1e0a3f5f3"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void i2c_stop </td>
          <td>(</td>
          <td class="paramtype">void&#160;</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Terminates the data transfer and releases the I2C bus. </p>
<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>

</div>
</div>
<a class="anchor" id="ga58dfadce0c2fee4bfac01df6cd2b4477"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">unsigned char i2c_start </td>
          <td>(</td>
          <td class="paramtype">unsigned char&#160;</td>
          <td class="paramname"><em>addr</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Issues a start condition and sends address and transfer direction. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">addr</td><td>address and transfer direction of I2C device </td></tr>
  </table>
  </dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
  <table class="retval">
    <tr><td class="paramname">0</td><td>device accessible </td></tr>
    <tr><td class="paramname">1</td><td>failed to access device </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<a class="anchor" id="ga93a9461da34295250ba935bbce9a980d"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">unsigned char i2c_rep_start </td>
          <td>(</td>
          <td class="paramtype">unsigned char&#160;</td>
          <td class="paramname"><em>addr</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Issues a repeated start condition and sends address and transfer direction. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">addr</td><td>address and transfer direction of I2C device </td></tr>
  </table>
  </dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
  <table class="retval">
    <tr><td class="paramname">0</td><td>device accessible </td></tr>
    <tr><td class="paramname">1</td><td>failed to access device </td></tr>
  </table>
  </dd>
</dl>

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</div>
<a class="anchor" id="gaee3747a01738315cd5580588994b6c28"></a>
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          <td class="memname">void i2c_start_wait </td>
          <td>(</td>
          <td class="paramtype">unsigned char&#160;</td>
          <td class="paramname"><em>addr</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Issues a start condition and sends address and transfer direction. </p>
<p>If device is busy, use ack polling to wait until device ready </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">addr</td><td>address and transfer direction of I2C device </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>none </dd></dl>

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          <td class="memname">unsigned char i2c_write </td>
          <td>(</td>
          <td class="paramtype">unsigned char&#160;</td>
          <td class="paramname"><em>data</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<p>Send one byte to I2C device. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">data</td><td>byte to be transfered </td></tr>
  </table>
  </dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
  <table class="retval">
    <tr><td class="paramname">0</td><td>write successful </td></tr>
    <tr><td class="paramname">1</td><td>write failed </td></tr>
  </table>
  </dd>
</dl>

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          <td class="memname">unsigned char i2c_readAck </td>
          <td>(</td>
          <td class="paramtype">void&#160;</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<p>read one byte from the I2C device, request more data from device </p>
<dl class="section return"><dt>Returns</dt><dd>byte read from I2C device </dd></dl>

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          <td class="memname">unsigned char i2c_readNak </td>
          <td>(</td>
          <td class="paramtype">void&#160;</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<p>read one byte from the I2C device, read is followed by a stop condition </p>
<dl class="section return"><dt>Returns</dt><dd>byte read from I2C device </dd></dl>

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          <td class="memname">unsigned char i2c_read </td>
          <td>(</td>
          <td class="paramtype">unsigned char&#160;</td>
          <td class="paramname"><em>ack</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<p>read one byte from the I2C device </p>
<p>Implemented as a macro, which calls either <a class="el" href="group__pfleury__ic2master.html#ga32ac22052d55f93375b024192217db21">i2c_readAck</a> or <a class="el" href="group__pfleury__ic2master.html#gad89e839fc17b05fbb5dd79897c55234e">i2c_readNak</a></p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">ack</td><td>1 send ack, request more data from device<br />
 0 send nak, read is followed by a stop condition </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>byte read from I2C device </dd></dl>

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