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<h2>
<a name="1204414"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">16.1 Introduction</font>
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<a name="1204416"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The debugging support library allows an application to access host files and the host screen and keyboard when the debugger is present. Strings can be displayed, and characters can be read from the keyboard. Files can be opened, closed, read from and written to. Functions are also provided to execute a debugger command and to close down the debugger.</font>
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<a name="1204417"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The debugger is always present when the application is being run by <strong>st20run</strong> on a hardware target. It is also present when the application is run on a hardware target from ROM and the host is present and <strong>st20run</strong> is running and connected to the target.</font>
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<a name="1204418"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">On hardware targets the functions signal that a host I/O operation is required via the diagnostic controller unit of the device. The debugger acts on such signal events when it detects them. A defined interface between the functions and the debugger allows the debugger to service the I/O request, for example, to open a file.</font>
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<a name="1204419"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The simulator can also service some of these functions in the event that the debugger is not present. In this case the functions issue a special pseudo-instruction which informs the simulator of a debugging event. The event is serviced before the function returns, at which point normal simulation can continue. Those debug functions which are designed to control the debugger are not serviced and instead cause a warning message to be displayed by the simulator.</font>
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<a name="1204420"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The debugger is not present when the application is being run on a hardware target as a stand-alone system from ROM. If neither the debugger nor the simulator is in use then there is no way for the debugging events to be serviced. When the debugger is connected, it is also possible for debug input/output to be turned off by the <font size=2 face=Courier><strong>informs</strong></font> command. In both cases the debug functions return the error code <font size=2 face=Courier><strong>DEBUG_NOT_CONNECTED</strong></font>.</font>
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<a name="1204424"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The header file for the debugging functions is <font size=2 face=Courier><strong>debug.h</strong></font>; see <a href="libsdeb3.htm#1205549"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Table⌨️ 快捷键说明
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