MIDIReadAsync

Syntax

#include <revolution/midi.h>

#define MIDI_CHAN0                   0
#define MIDI_CHAN1                   1
#define MIDI_CHAN2                   2
#define MIDI_CHAN3                   3
#define MIDI_MAX_CHAN                4

#define MIDI_JSTAT_MASK           0x3a
#define MIDI_JSTAT_FLAGS_SHIFT       4
#define MIDI_JSTAT_FLAGS_MASK     0x30
#define MIDI_JSTAT_SEND           0x08
#define MIDI_JSTAT_RECV           0x02

typedef void (*MIDICallback)(s32 chan, s32 ret);

s32 MIDIReadAsync(s32 chan, u8* dst, u8* status, MIDICallback callback);

Arguments

chan One of the MIDI_CHANn GameCube controller ports.

dst u8 type of pointer to the buffer storing read data.

status Pointer to the u8 type of variable, which stores the status value returned by the MIDI adapter. The value is masked using MIDI_JSTAT_MASK and is valid only when execution terminates normally.

callback Callback function called when the process terminates.

chan	One of the `MIDI_CHANn` GameCube controller ports.
dst	u8 type of pointer to the buffer storing read data.
status	Pointer to the u8 type of variable, which stores the status value returned by the MIDI adapter. The value is masked using `MIDI_JSTAT_MASK` and is valid only when execution terminates normally.
callback	Callback function called when the process terminates.

Return Values

Returns one of the following codes. If MIDI_READY is returned, execution terminated normally.

MIDI_READY MIDI_BUSY

Description

Asynchronously 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 MIDIRead. If the MIDI_JSTAT_SEND bit of status is 0, it indicates that the MIDI adapter has not yet output data. Function call will fail if a MIDI adapter is not connected.

Revision History

2007/05/09 Initial version.