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USB Audio Design Guide 58/61

c_mix_ctl Optional chanend to be connected to the mixer thread if present

c_clk_ctl

Optional chanend to be connected to the clockgen thread if present.

c_usb_test Optional chanend to be connected to XUD if test modes required.

void buffer(chanend c_aud_out,

chanend c_aud_in,

chanend c_aud_fb,

chanend c_sof,

chanend c_aud_ctl,

in port p_off_mclk)

USB Audio Buﬀering Thread.

This function buﬀers USB audio data between the XUD layer and the decouple

thread. Most of the chanend parameters to the function should be connected to

XUD_Manager()

This function has the following parameters:

c_aud_out Audio OUT endpoint channel connected to the XUD

c_aud_in Audio IN endpoint channel connected to the XUD

c_aud_fb Audio feedback endpoint channel connected to the XUD

c_midi_from_host

MIDI OUT endpoint channel connected to the XUD

c_midi_to_host

MIDI IN endpoint channel connected to the XUD

c_int Audio clocking interrupt endpoint channel connected to the XUD

c_sof Start of frame channel connected to the XUD

c_aud_ctl Audio control channel connected to Endpoint0()

p_off_mclk

A port that is clocked of the MCLK input (not the MCLK input itself)

void decouple(chanend c_audio_out, chanend ?c_clk_int)

Manage the data transfer between the USB audio buﬀer and the Audio I/O driver.

This function has the following parameters:

c_audio_out Channel connected to the audio() or mixer() threads

c_led

Optional chanend connected to an led driver thread for debugging

purposes

c_midi Optional chanend connect to usb_midi() thread if present

REV 6.1

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Request AudioReQuest N.Series Handbuch Seite 58