=> R0 bit 0 = 0 to read rx buffer size
= 1 to read tx buffer size
bits 1-2 = MIDI port number (0-3)
<= R0 = free bytes in selected buffer
Return the number of free bytes in the transmit or receive buffer. These buffers can fill (rx buffer) or empty (tx buffer) at a maximum rate of 320µs per byte.
Default buffer sizes are 512 bytes for the transmit bufffer, and 1024 bytes for the receive buffer (programmable with MIDI_SetBufferSize
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