1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2<html>
3<head>
4<META http-equiv="Content-Type" content="text/html; charset=windows-1252">
5<META name="GENERATOR" content="IBM WebSphere Studio Homepage Builder Version 7.0.0.0 for Windows">
6<META http-equiv="Content-Style-Type" content="text/css">
7<title>OS_EnableInterrupts_IrqAndFiq</title>
8<LINK rel="stylesheet" href="../../css/nitro.css" type="text/css">
9</head>
10<body>
11<h1 align="left">OS_EnableInterrupts_IrqAndFiq <img src="../../image/NTR.gif" align="middle"><img src="../../image/TWL.gif" align="middle"></h1>
12<h2>Syntax</h2>
13<dl>
14  <dd>
15<CODE>#include &lt;nitro/os.h&gt;</CODE><BR>
16  <BR>
17  <CODE>OSIntrMode OS_EnableInterrupts_IrqAndFiq( void );</CODE></dd>
18</dl><h2>Arguments</h2>
19<P>None.</P>
20<h2>Return Values</h2>
21<p>Returns a value that indicates the state before this function was called.</p>
22<p>The return value type is <CODE>OSIntrMode</CODE> (a <CODE>u32</CODE> typedef), but the return value is the logical sum of the <CODE>OSIntrMode_Irq</CODE> and <CODE>OSIntrMode_Fiq</CODE> enumerated types.<BR><BR> The <CODE>OSIntrMode_Irq</CODE> enumerated type:</p>
23<TABLE cellspacing="2">
24  <TBODY>
25    <TR>
26      <TH>Value</TH>
27      <TH>Previous state</TH>
28    </TR>
29    <TR>
30      <TD>OS_INTRMODE_IRQ_DISABLE</TD>
31      <TD>IRQ Disable (prohibited)</TD>
32    </TR>
33    <TR>
34      <TD>OS_INTRMODE_IRQ_ENABLE</TD>
35      <TD>IRQ Enable (permitted)</TD>
36    </TR>
37  </TBODY>
38</TABLE>
39<p><BR> The <CODE>OSIntrMode_Fiq</CODE> enumerated type:</P>
40<TABLE cellspacing="2">
41  <TBODY>
42    <TR>
43      <TH>Value</TH>
44      <TH>Previous state</TH>
45    </TR>
46    <TR>
47      <TD>OS_INTRMODE_FIQ_DISABLE</TD>
48      <TD>FIQ Disable (prohibited)</TD>
49    </TR>
50    <TR>
51      <TD>OS_INTRMODE_FIQ_ENABLE</TD>
52      <TD>FIQ Enable (permitted)</TD>
53    </TR>
54  </TBODY>
55</TABLE>
56<H2>Description</H2>
57<P>This function enables the IRQ and FIQ interrupts.</P>
58<P>The master enable flag for all interrupts (the Interrupt Master Enable Flag) is enabled here. Even if the IRQ interrupt causes are enabled separately, interrupts will not be generated if IRQ is prohibited with this function.</P>
59<P>The return value indicates the state prior to calling the function.</P>
60<h2>Internal Operation</h2>
61<P>The CPSR register (current program status register) IRQ and FIQ interrupt control bits are reset (the reset is enabled).  </P>
62<h2>See Also</h2>
63<p><CODE><A href="OS_DisableInterrupts_IrqAndFiq.html">OS_DisableInterrupts_IrqAndFiq</A><BR>
64 <A href="OS_RestoreInterrupts_IrqAndFiq.html">OS_RestoreInterrupts_IrqAndFiq</A><BR>
65 <A href="OS_EnableInterrupts.html">OS_EnableInterrupts</A><br></CODE></p>
66<H2>Revision History</H2>
67<P>
682005/03/08 Standardized the Japanese word for &quot;interrupt.&quot;<br /> 2004/03/04 Moved from <CODE>OS_EnableInterrupts</CODE>.</P>
69<hr><p>CONFIDENTIAL</p></body>
70</html>
71