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<h2>
<a name="1206584"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">interrupt_enable</font>
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<p>
<a name="1206585"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Enable an interrupt level</font>
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<h3>
<a name="1206586"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Synopsis</font>
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<a name="1206587"> </a><font size=2 face=Courier><strong>#include <interrup.h><br></strong></font>
<a name="1231618"> </a><font size=2 face=Courier><strong>int interrupt_enable( int <font size=2 face=Courier><strong><em>Level </em></strong></font>);<br></strong></font>
<h3>
<a name="1231619"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Arguments</font>
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<a name="1231626"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><b><font size=2 face=Courier><strong><em>int Level</em></strong></font></b></font>
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<dl><dl> <dl>
<dt> <a name="1231628"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Interrupt level</font>
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</dl></dl>
<h3>
<a name="1206592"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Results</font>
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<p>
<a name="1206593"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>0</strong></font> for success, <font size=2 face=Courier><strong>-1</strong></font> if an error occurs.</font>
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<h3>
<a name="1206594"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Errors</font>
</h3>
<p>
<a name="1206595"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Returns <font size=2 face=Courier><strong>-1</strong></font> if the interrupt level is illegal.</font>
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<h3>
<a name="1206596"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Description</font>
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<p>
<a name="1206597"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Enable interrupt level <font size=2 face=Courier><strong><em>Level</em></strong></font>. This involves writing to the interrupt controller's <span class=Signal>Set_Mask</span> register.</font>
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<p>
<a name="1206598"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><em>Note: 1 Although the global enables bit can still be specified as <font size=2 face=Courier><strong>INTERRUPT_GLOBAL_ENABLE</strong></font> this usage is no longer recommended; use the function <font size=2 face=Courier><strong>interrupt_enable_global</strong></font> instead.</em></font>
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<p>
<a name="1206599"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><em> 2 This function is provided as part of the IntC library, and so is always available whichever ILC is used. However, when ILC-2 and ILC-3 are being used, the ILC library enables all interrupt levels, and expects them to remain enabled, so that interrupts can be controlled using the function <font size=2 face=Courier><strong>interrupt_enable_number</strong></font>. Thus the use of <font size=2 face=Courier><strong>interrupt_enable</strong></font> is discouraged. See <a href="int.htm#1204413"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Chapter⌨️ 快捷键说明
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