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8<title>MIDIReadAsync</title>
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12
13<h1>MIDIReadAsync</h1>
14
15<h2>Syntax</h2>
16<dl><dd><pre class="construction">
17#include &lt;revolution/midi.h&gt;
18
19#define MIDI_CHAN0                   0
20#define MIDI_CHAN1                   1
21#define MIDI_CHAN2                   2
22#define MIDI_CHAN3                   3
23#define MIDI_MAX_CHAN                4
24
25#define MIDI_JSTAT_MASK           0x3a
26#define MIDI_JSTAT_FLAGS_SHIFT       4
27#define MIDI_JSTAT_FLAGS_MASK     0x30
28#define MIDI_JSTAT_SEND           0x08
29#define MIDI_JSTAT_RECV           0x02
30
31typedef void (*MIDICallback)(s32 chan, s32 ret);
32
33s32 MIDIReadAsync(s32 chan, u8* dst, u8* status, MIDICallback callback);
34</pre></dd></dl>
35
36<h2>Arguments</h2>
37<p>
38<TABLE class="arguments" border="1" >
39  <tr>
40<TH>chan</TH>
41<TD>One of the <code>MIDI_CHAN<em>n</em></code> GameCube controller ports.</TD>
42  </tr>
43  <tr>
44<TH>dst</TH>
45<TD>u8 type of pointer to the buffer storing read data.</TD>
46  </tr>
47  <tr>
48<TH>status</TH>
49<TD>Pointer to the u8 type of variable, which stores the status value returned by the MIDI adapter. The value is masked using <CODE>MIDI_JSTAT_MASK</CODE> and is valid only when execution terminates normally.</TD>
50  </tr>
51  <tr>
52<TH>callback</TH>
53<TD>Callback function called when the process terminates.</TD>
54  </tr>
55</TABLE>
56</p>
57
58<h2>Return Values</h2>
59<p>
60Returns one of the following codes. If <CODE>MIDI_READY</CODE> is returned, execution terminated normally.
61<p>
62<code>MIDI_READY<br> MIDI_BUSY<br></code>
63</p>
64</p>
65
66<h2>Description</h2>
67<p>
68Asynchronously issues a command for obtaining four bytes of data from the MIDI adapter. The specified callback function is called if the command is issued successfully and there is a response from the MIDI adapter. The second argument of the callback function is the same as the return value of the synchronous function <CODE>MIDIRead</CODE>. If the <CODE>MIDI_JSTAT_SEND</CODE> bit of <SPAN class="argument">status</SPAN> is 0, it indicates that the MIDI adapter has not yet output data. Function call will fail if a MIDI adapter is not connected.
69</p>
70
71<h2>See Also</h2>
72<p class="reference">
73<a href="./MIDIRead.html">MIDIRead</a>
74</p>
75
76<h2>Revision History</h2>
77<p>
782007/05/09 Initial version. <BR>
79</p>
80
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