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<a name="1204499"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">6.9 System defaults</font>
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<p>
<a name="1222419"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">To make it easy to enable trace, <strong>st20run</strong> always configures it. When <strong>st20run</strong> starts the target program for the first time, it checks to see if tracing is configured. If it is not then <strong>st20run</strong> evaluates the following command language variables to set up a default trace configuration:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1222420"> </a><font size=2 face=Courier><strong>_ST_TraceBufferLocation</strong></font> for the start address of the trace buffer,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1214338"> </a><font size=2 face=Courier><strong>_ST_TraceBufferSize</strong></font> for the size of the trace buffer,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1214301"> </a><font size=2 face=Courier><strong>_ST_TraceBufferSettings</strong></font> for the other trace acquire settings,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1214303"> </a><font size=2 face=Courier><strong>_ST_TraceEnabled</strong></font> if trace is to enabled once it is configured.</font></p>
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<a name="1222463"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The user can change the default values for these variables by defining them in their own configuration file. These variables define the parameters that <strong>st20run</strong> utilizes with the commands shown in <a href="trace10.htm#1222500"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table⌨️ 快捷键说明
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