=> 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 = received MIDI byte
= 0 if recieve buffer empty, or incomplete message received. If entered with R0 = -1, distinguish between these cases by checking the port number in bits 28-31
bit 24 = 1 if byte received
bits 28-31 MIDI port number where byte was received
R1 = received time
= 0 if receive buffer empty or clock disabled
Return the next received MIDI byte, excluding Real Time messages which are processed internally. Generally, MIDI_RxCommand should be used in preference to this command to reduce SWI time overhead.
This SWI can return an error itself:
· &20402 if there was a framing error when this byte was received,
· &20403 if there was an overun error when this byte 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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