130 lines
7.6 KiB
HTML
130 lines
7.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
|
|
<meta name="generator" content="Doxygen 1.8.20"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1"/>
|
|
<title>Labor04: xStreamBufferCreateStatic</title>
|
|
<link href="tabs.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="jquery.js"></script>
|
|
<script type="text/javascript" src="dynsections.js"></script>
|
|
<link href="navtree.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="resize.js"></script>
|
|
<script type="text/javascript" src="navtreedata.js"></script>
|
|
<script type="text/javascript" src="navtree.js"></script>
|
|
<link href="search/search.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="search/searchdata.js"></script>
|
|
<script type="text/javascript" src="search/search.js"></script>
|
|
<link href="doxygen.css" rel="stylesheet" type="text/css" />
|
|
</head>
|
|
<body>
|
|
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
|
|
<div id="titlearea">
|
|
<table cellspacing="0" cellpadding="0">
|
|
<tbody>
|
|
<tr style="height: 56px;">
|
|
<td id="projectalign" style="padding-left: 0.5em;">
|
|
<div id="projectname">Labor04
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<!-- Generated by Doxygen 1.8.20 -->
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
var searchBox = new SearchBox("searchBox", "search",false,'Search');
|
|
/* @license-end */
|
|
</script>
|
|
<script type="text/javascript" src="menudata.js"></script>
|
|
<script type="text/javascript" src="menu.js"></script>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(function() {
|
|
initMenu('',true,false,'search.php','Search');
|
|
$(document).ready(function() { init_search(); });
|
|
});
|
|
/* @license-end */</script>
|
|
<div id="main-nav"></div>
|
|
</div><!-- top -->
|
|
<div id="side-nav" class="ui-resizable side-nav-resizable">
|
|
<div id="nav-tree">
|
|
<div id="nav-tree-contents">
|
|
<div id="nav-sync" class="sync"></div>
|
|
</div>
|
|
</div>
|
|
<div id="splitbar" style="-moz-user-select:none;"
|
|
class="ui-resizable-handle">
|
|
</div>
|
|
</div>
|
|
<script type="text/javascript">
|
|
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
|
|
$(document).ready(function(){initNavTree('group__x_stream_buffer_create_static.html',''); initResizable(); });
|
|
/* @license-end */
|
|
</script>
|
|
<div id="doc-content">
|
|
<!-- window showing the filter options -->
|
|
<div id="MSearchSelectWindow"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
onkeydown="return searchBox.OnSearchSelectKey(event)">
|
|
</div>
|
|
|
|
<!-- iframe showing the search results (closed by default) -->
|
|
<div id="MSearchResultsWindow">
|
|
<iframe src="javascript:void(0)" frameborder="0"
|
|
name="MSearchResults" id="MSearchResults">
|
|
</iframe>
|
|
</div>
|
|
|
|
<div class="header">
|
|
<div class="headertitle">
|
|
<div class="title">xStreamBufferCreateStatic</div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
<p><a class="el" href="stream__buffer_8h.html">stream_buffer.h</a></p>
|
|
<pre>
|
|
StreamBufferHandle_t xStreamBufferCreateStatic( size_t xBufferSizeBytes,
|
|
size_t xTriggerLevelBytes,
|
|
uint8_t *pucStreamBufferStorageArea,
|
|
StaticStreamBuffer_t *pxStaticStreamBuffer );
|
|
</pre><p> Creates a new stream buffer using statically allocated memory. See <a class="el" href="stream__buffer_8h.html#a39aa4dd8b83e2df7ded291f863fb5fed">xStreamBufferCreate()</a> for a version that uses dynamically allocated memory.</p>
|
|
<p>configSUPPORT_STATIC_ALLOCATION must be set to 1 in <a class="el" href="_free_r_t_o_s_config_8h.html">FreeRTOSConfig.h</a> for <a class="el" href="stream__buffer_8h.html#a3c248575ac1b83801db605b32a118f77">xStreamBufferCreateStatic()</a> to be available.</p>
|
|
<dl class="params"><dt>Parameters</dt><dd>
|
|
<table class="params">
|
|
<tr><td class="paramname">xBufferSizeBytes</td><td>The size, in bytes, of the buffer pointed to by the pucStreamBufferStorageArea parameter.</td></tr>
|
|
<tr><td class="paramname">xTriggerLevelBytes</td><td>The number of bytes that must be in the stream buffer before a task that is blocked on the stream buffer to wait for data is moved out of the blocked state. For example, if a task is blocked on a read of an empty stream buffer that has a trigger level of 1 then the task will be unblocked when a single byte is written to the buffer or the task's block time expires. As another example, if a task is blocked on a read of an empty stream buffer that has a trigger level of 10 then the task will not be unblocked until the stream buffer contains at least 10 bytes or the task's block time expires. If a reading task's block time expires before the trigger level is reached then the task will still receive however many bytes are actually available. Setting a trigger level of 0 will result in a trigger level of 1 being used. It is not valid to specify a trigger level that is greater than the buffer size.</td></tr>
|
|
<tr><td class="paramname">pucStreamBufferStorageArea</td><td>Must point to a uint8_t array that is at least xBufferSizeBytes + 1 big. This is the array to which streams are copied when they are written to the stream buffer.</td></tr>
|
|
<tr><td class="paramname">pxStaticStreamBuffer</td><td>Must point to a variable of type StaticStreamBuffer_t, which will be used to hold the stream buffer's data structure.</td></tr>
|
|
</table>
|
|
</dd>
|
|
</dl>
|
|
<dl class="section return"><dt>Returns</dt><dd>If the stream buffer is created successfully then a handle to the created stream buffer is returned. If either pucStreamBufferStorageArea or pxStaticstreamBuffer are NULL then NULL is returned.</dd></dl>
|
|
<p>Example use: </p><pre></pre><pre>// Used to dimension the array used to hold the streams. The available space
|
|
// will actually be one less than this, so 999.
|
|
#define STORAGE_SIZE_BYTES 1000</pre><pre>// Defines the memory that will actually hold the streams within the stream
|
|
// buffer.
|
|
static uint8_t ucStorageBuffer[ STORAGE_SIZE_BYTES ];</pre><pre>// The variable used to hold the stream buffer structure.
|
|
StaticStreamBuffer_t xStreamBufferStruct;</pre><pre>void MyFunction( void )
|
|
{
|
|
StreamBufferHandle_t xStreamBuffer;
|
|
const size_t xTriggerLevel = 1;</pre><pre> xStreamBuffer = xStreamBufferCreateStatic( sizeof( ucBufferStorage ),
|
|
xTriggerLevel,
|
|
ucBufferStorage,
|
|
&xStreamBufferStruct );</pre><pre> // As neither the pucStreamBufferStorageArea or pxStaticStreamBuffer
|
|
// parameters were NULL, xStreamBuffer will not be NULL, and can be used to
|
|
// reference the created stream buffer in other stream buffer API calls.</pre><pre> // Other code that uses the stream buffer can go here.
|
|
}</pre><pre></pre> </div><!-- contents -->
|
|
</div><!-- doc-content -->
|
|
<!-- start footer part -->
|
|
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
|
|
<ul>
|
|
<li class="footer">Generated by <a href="http://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.8.20 </li>
|
|
</ul>
|
|
</div>
|
|
</body>
|
|
</html>
|