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<title>10.10 Retrieving details of pending interrupts</title>
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<a name="1205059"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">10.10 Retrieving details of pending interrupts</font>
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<a name="1205060"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The following functions return details of pending interrupts:</font>
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<a name="1205061"> </a><font size=2 face=Courier><strong>#include <interrupt.h><br>int interrupt_pending(void);<br>int interrupt_pending_number(void);<br>int interrupt_test_number(int <font size=2 face=Courier><strong><em>Number</em></strong></font>);<br></strong></font>
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<a name="1205066"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font face="Verdana, Arial, Helvetica, sans-serif"><b>interrupt_pendin</b></font><font size=2 face=Courier><strong>g(</strong></font><font face="Verdana, Arial, Helvetica, sans-serif"><b>)</b></font> returns which interrupt levels are pending, that is, those interrupts which have been set by a peripheral, but whose interrupt handlers have not yet run. This function should be used when peripherals are attached directly to the interrupt controller. </font>
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<a name="1212507"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font face="Verdana, Arial, Helvetica, sans-serif"><b>interrupt_pending_number(</b></font><font face="Verdana, Arial, Helvetica, sans-serif"><b>)</b></font> returns which interrupt numbers are pending, that is, all the interrupts which are currently set by peripherals. The ST20 C compiler treats <font size=2 face=Courier><strong>int</strong></font> as a 32-bit quantity, thus <font size=2 face=Courier><strong>interrupt_pending_number</strong></font> cannot be used on ILC-3 type interrupt level controllers because they have too many interrupt numbers.</font>
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<a name="1205067"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font face="Verdana, Arial, Helvetica, sans-serif"><b>interrupt_test_number</b></font><font face="Verdana, Arial, Helvetica, sans-serif"><b>()</b></font> can be used to test if any one specific interrupt number is pending. This function applies to any interrupt level controller because it does not return a mask.</font>
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<a name="1212572"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><em>Note: Shared interrupt handlers should not call <font face="Verdana, Arial, Helvetica, sans-serif"><b>interrupt_pending_number</b></font> or <font face="Verdana, Arial, Helvetica, sans-serif"><b>interrupt_test_number</b></font> since they will find the called interrupt's <span class=Signal>pending</span> bit already reset (this is done before running the applications handler). Instead, they should use the interrupt handlers argument to differentiate between different interrupt numbers.</em></font>
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