MIDI

lib_xua supports MIDI input/output over USB as per Universal Serial Bus Device Class Definition for MIDI Devices.

MIDI functionality is enabled with the define in Table 22.

Table 22 MIDI enable define

Define	Description	Default
MIDI	Enable MIDI functionality	0 (Disabled)

lib_xua supports MIDI receive on a 4-bit or 1-bit port, defaulting to using a 1-bit port. MIDI transmit is supported over a port of any bit-width. By default lib_xua assumes the transmit and receive I/O is connected to bit[0] of the port. This is configurable for the transmit port. Table 23 provides information on configuring these parameters.

Table 23 MIDI port defines

Define	Description	Default
MIDI_RX_PORT_WIDTH	Port width of the MIDI rx port (1 or 4bit)	1 (1-bit port)
MIDI_SHIFT_TX	MIDI tx bit	0 (bit[0])

The MIDI code expects that the ports for receive and transmit are defined in the application XN file on the relevant Tile. The expected names for the ports are PORT_MIDI_IN and PORT_MIDI_OUT, for example:

<Tile Number="0" Reference="tile[0]">
    <!-- MIDI -->
    <Port Location="XS1_PORT_1F"  Name="PORT_MIDI_IN"/>
    <Port Location="XS1_PORT_4C"  Name="PORT_MIDI_OUT"/>
</Tile>