rcu19.htm
来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 83 行
HTM
83 行
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta name="GENERATOR" content="Quadralay WebWorks Publisher Professional Edition 6.0.5">
<meta name="TEMPLATEBASE" content="book_html">
<meta name="LASTUPDATED" content="12/04/03 16:05:57">
<title>10.4.1 OS20 kernel </title>
<STYLE TYPE="text/css">
<!--
span.Signal { text-transform: uppercase; font-family: Verdana }
-->
</STYLE>
</head>
<body link="#3366CC" vlink="#9999CC" text="#000000" alink="#0000CC" bgcolor="#FFFFFF"
background="images/backgrnd.gif">
<p><img src="images/stlogo.gif" width="106" height="83" align="left"
alt="logo here!"> </p>
<table width="331" border="0" align="right" cellpadding="0" cellspacing="0">
<tr>
<td><a href="a_refman.htm"><img src="images/navtoc.gif" width="84" height="23"
border="0" alt="TOC"> </a></td>
<td><a href="rcu18.htm"><img src="images/navprev.gif" width="80" height="23"
border="0" alt="PREV"> </a></td>
<td><a href="rcu20.htm"><img src="images/navnext.gif" width="83" height="23"
border="0" alt="NEXT"> </a></td>
<td><a href="a_refmaa.htm"><img src="images/navidx.gif" width="84" height="23"
border="0" alt="INDEX"> </a></td>
</tr>
</table>
<p><br clear="all">
</p>
<hr align="left">
<blockquote>
<h3>
<a name="1204813"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">10.4.1 OS20 kernel</font>
</h3>
<p>
<a name="1204814"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Ensure that only one copy of the kernel is linked in. Many of the standard C run-time libraries can be linked into both the main application code and the RCU with no problems. For simple functions, for example <font size=2 face=Courier><strong>strlen</strong></font>, this may even be desirable, to reduce the function call overhead at the expense of code size.</font>
</p>
<p>
<a name="1204818"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">However, for OS20 it is vital that there is only one copy of the kernel running on the processor. The easiest way to do this is to ensure that the application code (which is run when the processor is booted and loads any RCUs) also starts OS20. Any RCUs should only ever <font size=2 face=Courier><strong>import</strong></font> OS20 functions from the application.</font>
</p>
<p>
<a name="1204825"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><em>Note: The <font face="Verdana, Arial, Helvetica, sans-serif"><b>st20cc</b></font> option <font face="Verdana, Arial, Helvetica, sans-serif"><b>runtime os20</b></font> can still be used with <font size=2 face=Courier><strong>rcu</strong></font> or <font face="Verdana, Arial, Helvetica, sans-serif"><b>dl</b></font>. The linker scripts are written so that when used with an RCU, run-time libraries are never linked in.</em></font>
</p>
</blockquote>
<hr>
<table width="331" border="0" align="left" cellpadding="0" cellspacing="0">
<tr>
<td><a href="a_refman.htm"><img src="images/navtoc.gif" width="84" height="23"
border="0" alt="TOC"> </a></td>
<td><a href="rcu18.htm"><img src="images/navprev.gif" width="80" height="23"
border="0" alt="PREV"> </a></td>
<td><a href="rcu20.htm"><img src="images/navnext.gif" width="83" height="23"
border="0" alt="NEXT"> </a></td>
<td><a href="a_refmaa.htm"><img src="images/navidx.gif" width="84" height="23"
border="0" alt="INDEX"> </a></td>
</tr>
</table>
<font size=1 face="Verdana, Arial, Helvetica, sans-serif"> © 2001, 2002, 2003 STMicroelectronics. All Rights Reserved.<br>
ADCS 7250966F</font>
</body>
</html>
⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?