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<h2>
<a name="1204451"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">3.2 Optional debug features</font>
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<p>
<a name="1205910"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The STLite/OS20 kernel is supplied in two forms, the deployment kernel and the debug kernel. The debug kernel contains extra features designed to find bugs and assist with performance tuning.</font>
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<a name="1205914"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><em>Note: All features in the debug kernel are slightly intrusive. This may subtly alter the real-time performance of the system being debugged, however, in most cases the difference in performance should be negligible.</em></font>
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<h3>
<a name="1205918"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">3.2.1 Assertion checking</font>
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<a name="1205920"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The debug kernel performs assertion checks on entry to every STLite/OS20 library call. These assertions catch a number of illegal calling conditions that can lead to a variety of difficult to debug scheduling failures. Specifically the assertions will be triggered if the application illegally:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205926"> </a>passes a NULL pointer argument,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205927"> </a>calls a function from an interrupt handler,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205928"> </a>calls a function from a high priority process (ST20-C2 only),</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205929"> </a>calls a function while interrupts are locked.</font></p>
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<a name="1205931"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">When an assertion is triggered a message is displayed identifying the failure and the machine will stop in the debugger at the point of failure. If a debugger is not connected then the machine will enter a busy loop until a debugger is connected at which point it will display the message and stop the machine.</font>
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<h3>
<a name="1205937"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">3.2.2 Time logging</font>
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<a name="1205939"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">For targets with an ST20-C2 core the debug kernel is also configured to maintain a record of the amount of time each task and interrupt spends executing. This facility is not available on ST20-C1 cores.</font>
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<a name="1205943"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The following information is available in the debug kernel.</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205945"> </a><strong>Task time logging</strong> maintains a record of the amount of time each task spends running on the processor. The data collected can be accessed using the <font size=2 face=Courier><strong>task_status</strong></font> function.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205949"> </a><strong>Interrupt time logging</strong> maintains a record of the amount of time spent servicing each interrupt and the number of times the interrupt has been called. The functions <font size=2 face=Courier><strong>interrupt_status</strong></font> and <font size=2 face=Courier><strong>interrupt_status_number</strong></font> are used to return this information.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205954"> </a>The functions <font size=2 face=Courier><strong>kernel_idle</strong></font> and <font size=2 face=Courier><strong>kernel_time</strong></font> return the time spent idle and the total up-time respectively. The total up-time being the time elapsed since the kernel started.</font></p>
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