=> R0 = MIDI port number (0-3)
= -1 to look at each port in turn (from 0 to 3) until one is found with new data
<= R0 byte 0 = status
byte 1 = data byte 1, or 0 if none expected
byte 2 = data byte 2, or 0 if none expected
bits 24-25 number of bytes in this message (0-3)
bits 28-31 MIDI port number where byte was received
= 0 if receive buffer empty, or incomplete message received.
R1 = received time of last message
= 0 if receive buffer empty or clock disabled
Return the next complete MIDI command as a set of bytes (normally excluding System Real Time). A status byte should always be returned, even when the incoming data is on running status, except when the receive buffer is empty.
System Exclusive messages will be received as one status byte (&F0) and one data byte, and successive calls to MIDI_RxCommand will treat the system exclusive as Running Status, with one data byte until EOX (end of exclusive, &F7) or any other status byte, except System Real Time, is encountered (&80-&F7).
This SWI can return an error itself:
· &20402 if there was a framing error when a byte in this message was received,
· &20403 if there was an overun error when a byte in this message was received,
· &20404 if the receive buffer of the interrogated port overflowed.
The corrupted byte will be returned on the next call to MIDI_RxByte or MIDI_RxCommand.
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