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<title>6.8 The trace buffer</title>
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<a name="1222346"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">6.8 The trace buffer</font>
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<a name="1204483"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A trace buffer must be defined in the memory of the target. By default, 16 words are available at the base of the <font size=2 face=Courier><strong>TRAPHANDLER</strong></font> memory segment. A user may wish to locate the trace buffer somewhere else in memory, or utilise a larger trace buffer. </font>
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<a name="1216788"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The user can reserve space by creating one of the following:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1214000"> </a>a symbol that is linked into the application</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1214103"> </a>a compiler generated section</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1214002"> </a>a memory segment</font></p>
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<a name="1214009"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">On a target with a DCU3, the trace buffer only needs to start on a word boundary and be a multiple of words in length. One of the easiest ways to create such a buffer is to have a source file that defines a global (static) array. For example, to reserve a 256 word trace buffer, create a C source file that just contains the following:</font>
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<a name="1214033"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">int tracebuff[256]</font>
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<a name="1222387"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">In the <strong>Trace and Profile Acquisition Settings</strong> window, the symbol <font size=2 face=Courier><strong>tracebuff</strong></font> can now be entered in the <strong>Trace Buffer Location and Size</strong>, <strong>Address</strong> field, see <a href="trace6.htm#1209482"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section⌨️ 快捷键说明
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