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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Xenomai API: Range / conversion API</title>
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<h1>Range / conversion API<br>
<small>
[<a class="el" href="group__level2__lib.html">Level 2 API</a>]</small>
</h1>
<p>
<div class="dynheader">
Collaboration diagram for Range / conversion API:</div>
<div class="dynsection">
<center><table><tr><td><img src="group__rng2__lib.png" border="0" alt="" usemap="#group____rng2____lib_map">
<map name="group____rng2____lib_map">
<area shape="rect" href="group__level2__lib.html" title="Level 2 API" alt="" coords="5,5,96,32"></map></td></tr></table></center>
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<p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#ge9709df63a769dc56c1014a90c7a6c64">a4l_sizeof_chan</a> (a4l_chinfo_t *chan)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the size in memory of an acquired element. <a href="#ge9709df63a769dc56c1014a90c7a6c64"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#gf293f2a9cf5da5b42121b23d85dcebed">a4l_sizeof_subd</a> (a4l_sbinfo_t *subd)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the size in memory of a digital acquired element. <a href="#gf293f2a9cf5da5b42121b23d85dcebed"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#gbcbfa9c2b9d5dc5c0e7f06faf1f8bc61">a4l_find_range</a> (<a class="el" href="structa4l__descriptor.html">a4l_desc_t</a> *dsc, unsigned int idx_subd, unsigned int idx_chan, unsigned long unit, double min, double max, a4l_rnginfo_t **rng)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Find the must suitable range. <a href="#gbcbfa9c2b9d5dc5c0e7f06faf1f8bc61"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#ge6191220fcfda0105b48df7bd364b584">a4l_rawtoul</a> (a4l_chinfo_t *chan, unsigned long *dst, void *src, int cnt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Unpack raw data (from the driver) into unsigned long values. <a href="#ge6191220fcfda0105b48df7bd364b584"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#gd9dd1255cb2a5f99b141bd9265b7ca95">a4l_rawtof</a> (a4l_chinfo_t *chan, a4l_rnginfo_t *rng, float *dst, void *src, int cnt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert raw data (from the driver) to float-typed samples. <a href="#gd9dd1255cb2a5f99b141bd9265b7ca95"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#gb8b5ff35fe75d3f32a828f4d64604e8b">a4l_rawtod</a> (a4l_chinfo_t *chan, a4l_rnginfo_t *rng, double *dst, void *src, int cnt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert raw data (from the driver) to double-typed samples. <a href="#gb8b5ff35fe75d3f32a828f4d64604e8b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#g8bdf03857c96f739e43a699c0ee8b777">a4l_ultoraw</a> (a4l_chinfo_t *chan, void *dst, unsigned long *src, int cnt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Pack unsigned long values into raw data (for the driver). <a href="#g8bdf03857c96f739e43a699c0ee8b777"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#g67ad3bedbc8f87f2c7421a075a7c2b59">a4l_ftoraw</a> (a4l_chinfo_t *chan, a4l_rnginfo_t *rng, void *dst, float *src, int cnt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert float-typed samples to raw data (for the driver). <a href="#g67ad3bedbc8f87f2c7421a075a7c2b59"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rng2__lib.html#gf7be342501248ba2138d7dc3b2cfeeed">a4l_dtoraw</a> (a4l_chinfo_t *chan, a4l_rnginfo_t *rng, void *dst, double *src, int cnt)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Convert double-typed samples to raw data (for the driver). <a href="#gf7be342501248ba2138d7dc3b2cfeeed"></a><br></td></tr>
</table>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="gf7be342501248ba2138d7dc3b2cfeeed"></a><!-- doxytag: member="range.c::a4l_dtoraw" ref="gf7be342501248ba2138d7dc3b2cfeeed" args="(a4l_chinfo_t *chan, a4l_rnginfo_t *rng, void *dst, double *src, int cnt)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int a4l_dtoraw </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">a4l_rnginfo_t * </td>
<td class="paramname"> <em>rng</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>cnt</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Convert double-typed samples to raw data (for the driver).
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>rng</em> </td><td>Range descriptor </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>dst</em> </td><td>Ouput buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>src</em> </td><td>Input buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>cnt</em> </td><td>Count of conversion to perform</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the count of conversion performed, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if some argument is missing or wrong; chan, rng and the pointers should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#gf7be342501248ba2138d7dc3b2cfeeed" title="Convert double-typed samples to raw data (for the driver).">a4l_dtoraw()</a> </li></ul>
<p>References <a class="el" href="channel__range_8h-source.html#l00204">A4L_RNG_FACTOR</a>, and <a class="el" href="range_8c-source.html#l00085">a4l_sizeof_chan()</a>.</p>
</div>
</div><p>
<a class="anchor" name="gbcbfa9c2b9d5dc5c0e7f06faf1f8bc61"></a><!-- doxytag: member="range.c::a4l_find_range" ref="gbcbfa9c2b9d5dc5c0e7f06faf1f8bc61" args="(a4l_desc_t *dsc, unsigned int idx_subd, unsigned int idx_chan, unsigned long unit, double min, double max, a4l_rnginfo_t **rng)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int a4l_find_range </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structa4l__descriptor.html">a4l_desc_t</a> * </td>
<td class="paramname"> <em>dsc</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>idx_subd</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>idx_chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned long </td>
<td class="paramname"> <em>unit</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>min</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>max</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">a4l_rnginfo_t ** </td>
<td class="paramname"> <em>rng</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Find the must suitable range.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>dsc</em> </td><td>Device descriptor filled by <a class="el" href="group__descriptor1__lib.html#g810401871fe8005ee0157c6910f94466" title="Open an Analogy device and basically fill the descriptor.">a4l_open()</a> and <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a></td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>idx_subd</em> </td><td>Index of the concerned subdevice </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>idx_chan</em> </td><td>Index of the concerned channel </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>unit</em> </td><td>Unit type used in the range </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>min</em> </td><td>Minimal limit value </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>max</em> </td><td>Maximal limit value </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>rng</em> </td><td>Found range</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The index of the most suitable range on success. Otherwise:</dd></dl>
<ul>
<li>-ENOENT is returned if a suitable range is not found.</li><li>-EINVAL is returned if some argument is missing or wrong; idx_subd, idx_chan and the dsc pointer should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#gbcbfa9c2b9d5dc5c0e7f06faf1f8bc61" title="Find the must suitable range.">a4l_find_range()</a> </li></ul>
<p>References <a class="el" href="descriptor_8c-source.html#l00430">a4l_get_chinfo()</a>, <a class="el" href="descriptor_8c-source.html#l00474">a4l_get_rnginfo()</a>, <a class="el" href="channel__range_8h-source.html#l00204">A4L_RNG_FACTOR</a>, <a class="el" href="channel__range_8h-source.html#l00225">A4L_RNG_UNIT</a>, and <a class="el" href="descriptor_8h-source.html#l00078">a4l_descriptor::magic</a>.</p>
</div>
</div><p>
<a class="anchor" name="g67ad3bedbc8f87f2c7421a075a7c2b59"></a><!-- doxytag: member="range.c::a4l_ftoraw" ref="g67ad3bedbc8f87f2c7421a075a7c2b59" args="(a4l_chinfo_t *chan, a4l_rnginfo_t *rng, void *dst, float *src, int cnt)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">int a4l_ftoraw </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">a4l_rnginfo_t * </td>
<td class="paramname"> <em>rng</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>cnt</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Convert float-typed samples to raw data (for the driver).
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>rng</em> </td><td>Range descriptor </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>dst</em> </td><td>Ouput buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>src</em> </td><td>Input buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>cnt</em> </td><td>Count of conversion to perform</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the count of conversion performed, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if some argument is missing or wrong; chan, rng and the pointers should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#g67ad3bedbc8f87f2c7421a075a7c2b59" title="Convert float-typed samples to raw data (for the driver).">a4l_ftoraw()</a> </li></ul>
<p>References <a class="el" href="channel__range_8h-source.html#l00204">A4L_RNG_FACTOR</a>, and <a class="el" href="range_8c-source.html#l00085">a4l_sizeof_chan()</a>.</p>
</div>
</div><p>
<a class="anchor" name="gb8b5ff35fe75d3f32a828f4d64604e8b"></a><!-- doxytag: member="range.c::a4l_rawtod" ref="gb8b5ff35fe75d3f32a828f4d64604e8b" args="(a4l_chinfo_t *chan, a4l_rnginfo_t *rng, double *dst, void *src, int cnt)" -->
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<td class="memname">int a4l_rawtod </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">a4l_rnginfo_t * </td>
<td class="paramname"> <em>rng</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"> <em>dst</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>cnt</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>
Convert raw data (from the driver) to double-typed samples.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>rng</em> </td><td>Range descriptor </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>dst</em> </td><td>Ouput buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>src</em> </td><td>Input buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>cnt</em> </td><td>Count of conversion to perform</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the count of conversion performed, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if some argument is missing or wrong; chan, rng and the pointers should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#gb8b5ff35fe75d3f32a828f4d64604e8b" title="Convert raw data (from the driver) to double-typed samples.">a4l_rawtod()</a> </li></ul>
<p>References <a class="el" href="channel__range_8h-source.html#l00204">A4L_RNG_FACTOR</a>, and <a class="el" href="range_8c-source.html#l00085">a4l_sizeof_chan()</a>.</p>
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<a class="anchor" name="gd9dd1255cb2a5f99b141bd9265b7ca95"></a><!-- doxytag: member="range.c::a4l_rawtof" ref="gd9dd1255cb2a5f99b141bd9265b7ca95" args="(a4l_chinfo_t *chan, a4l_rnginfo_t *rng, float *dst, void *src, int cnt)" -->
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<td class="memname">int a4l_rawtof </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">a4l_rnginfo_t * </td>
<td class="paramname"> <em>rng</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float * </td>
<td class="paramname"> <em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>cnt</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Convert raw data (from the driver) to float-typed samples.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>rng</em> </td><td>Range descriptor </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>dst</em> </td><td>Ouput buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>src</em> </td><td>Input buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>cnt</em> </td><td>Count of conversion to perform</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the count of conversion performed, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if some argument is missing or wrong; chan, rng and the pointers should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#gb8b5ff35fe75d3f32a828f4d64604e8b" title="Convert raw data (from the driver) to double-typed samples.">a4l_rawtod()</a> </li></ul>
<p>References <a class="el" href="channel__range_8h-source.html#l00204">A4L_RNG_FACTOR</a>, and <a class="el" href="range_8c-source.html#l00085">a4l_sizeof_chan()</a>.</p>
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<a class="anchor" name="ge6191220fcfda0105b48df7bd364b584"></a><!-- doxytag: member="range.c::a4l_rawtoul" ref="ge6191220fcfda0105b48df7bd364b584" args="(a4l_chinfo_t *chan, unsigned long *dst, void *src, int cnt)" -->
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<td class="memname">int a4l_rawtoul </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned long * </td>
<td class="paramname"> <em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>cnt</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
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<div class="memdoc">
<p>
Unpack raw data (from the driver) into unsigned long values.
<p>
This function takes as input driver-specific data and scatters each element into an entry of an unsigned long table. It is a convenience routine which performs no conversion, just copy.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>rng</em> </td><td>Range descriptor </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>dst</em> </td><td>Ouput buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>src</em> </td><td>Input buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>cnt</em> </td><td>Count of transfer to copy</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the count of copy performed, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if some argument is missing or wrong; chan, rng and the pointers should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#g8bdf03857c96f739e43a699c0ee8b777" title="Pack unsigned long values into raw data (for the driver).">a4l_ultoraw()</a> </li></ul>
<p>References <a class="el" href="range_8c-source.html#l00085">a4l_sizeof_chan()</a>.</p>
</div>
</div><p>
<a class="anchor" name="ge9709df63a769dc56c1014a90c7a6c64"></a><!-- doxytag: member="range.c::a4l_sizeof_chan" ref="ge9709df63a769dc56c1014a90c7a6c64" args="(a4l_chinfo_t *chan)" -->
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<td class="memname">int a4l_sizeof_chan </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Get the size in memory of an acquired element.
<p>
According to the board, the channels have various acquisition widths. With values like 8, 16 or 32, there is no problem finding out the size in memory (1, 2, 4); however with widths like 12 or 24, this function might be helpful to guess the size needed in RAM for a single acquired element.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the size in memory of an acquired element, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if the argument chan is NULL </li></ul>
<p>Referenced by <a class="el" href="range_8c-source.html#l00589">a4l_dtoraw()</a>, <a class="el" href="range_8c-source.html#l00519">a4l_ftoraw()</a>, <a class="el" href="range_8c-source.html#l00382">a4l_rawtod()</a>, <a class="el" href="range_8c-source.html#l00309">a4l_rawtof()</a>, <a class="el" href="range_8c-source.html#l00249">a4l_rawtoul()</a>, and <a class="el" href="range_8c-source.html#l00459">a4l_ultoraw()</a>.</p>
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<a class="anchor" name="gf293f2a9cf5da5b42121b23d85dcebed"></a><!-- doxytag: member="range.c::a4l_sizeof_subd" ref="gf293f2a9cf5da5b42121b23d85dcebed" args="(a4l_sbinfo_t *subd)" -->
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<td class="memname">int a4l_sizeof_subd </td>
<td>(</td>
<td class="paramtype">a4l_sbinfo_t * </td>
<td class="paramname"> <em>subd</em> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Get the size in memory of a digital acquired element.
<p>
This function is only useful for DIO subdevices. Digital subdevices are a specific kind of subdevice on which channels are regarded as bits composing the subdevice's bitfield. During a DIO acquisition, all bits are sampled. Therefore, <a class="el" href="group__rng2__lib.html#ge9709df63a769dc56c1014a90c7a6c64" title="Get the size in memory of an acquired element.">a4l_sizeof_chan()</a> is useless in this case and we have to use <a class="el" href="group__rng2__lib.html#gf293f2a9cf5da5b42121b23d85dcebed" title="Get the size in memory of a digital acquired element.">a4l_sizeof_subd()</a>. With bitfields which sizes are 8, 16 or 32, there is no problem finding out the size in memory (1, 2, 4); however with widths like 12 or 24, this function might be helpful to guess the size needed in RAM for a single acquired element.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>subd</em> </td><td>Subdevice descriptor</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the size in memory of an acquired element, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if the argument chan is NULL or if the subdevice is not a digital subdevice </li></ul>
<p>References <a class="el" href="subdevice_8h-source.html#l00072">A4L_SUBD_DI</a>, <a class="el" href="subdevice_8h-source.html#l00080">A4L_SUBD_DIO</a>, <a class="el" href="subdevice_8h-source.html#l00076">A4L_SUBD_DO</a>, and <a class="el" href="subdevice_8h-source.html#l00108">A4L_SUBD_TYPES</a>.</p>
<p>Referenced by <a class="el" href="sync_8c-source.html#l00277">a4l_sync_dio()</a>.</p>
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<a class="anchor" name="g8bdf03857c96f739e43a699c0ee8b777"></a><!-- doxytag: member="range.c::a4l_ultoraw" ref="g8bdf03857c96f739e43a699c0ee8b777" args="(a4l_chinfo_t *chan, void *dst, unsigned long *src, int cnt)" -->
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<td class="memname">int a4l_ultoraw </td>
<td>(</td>
<td class="paramtype">a4l_chinfo_t * </td>
<td class="paramname"> <em>chan</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>dst</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned long * </td>
<td class="paramname"> <em>src</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>cnt</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Pack unsigned long values into raw data (for the driver).
<p>
This function takes as input a table of unsigned long values and gather them according to the channel width. It is a convenience routine which performs no conversion, just formatting.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>chan</em> </td><td>Channel descriptor </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>rng</em> </td><td>Range descriptor </td></tr>
<tr><td valign="top"><tt>[out]</tt> </td><td valign="top"><em>dst</em> </td><td>Ouput buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>src</em> </td><td>Input buffer </td></tr>
<tr><td valign="top"><tt>[in]</tt> </td><td valign="top"><em>cnt</em> </td><td>Count of transfer to copy</td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the count of copy performed, otherwise a negative error code:</dd></dl>
<ul>
<li>-EINVAL is returned if some argument is missing or wrong; chan, rng and the pointers should be checked; check also the kernel log ("dmesg"); WARNING: <a class="el" href="group__descriptor1__lib.html#g4899cdf9b31aa0cbe0d95bf3c2f2f981" title="Fill the descriptor with subdevices, channels and ranges data.">a4l_fill_desc()</a> should be called before using <a class="el" href="group__rng2__lib.html#g8bdf03857c96f739e43a699c0ee8b777" title="Pack unsigned long values into raw data (for the driver).">a4l_ultoraw()</a> </li></ul>
<p>References <a class="el" href="range_8c-source.html#l00085">a4l_sizeof_chan()</a>.</p>
</div>
</div><p>
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