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module_xud Low level USB library

module_usb_shared Common code for USB applications

module_usb_aud_shared Common code for USB audio applications

module_spdif_tx S/PDIF transmit code

module_spdif_rx S/PDIF receive code

module_adat_rx_v3 ADAT receive code

module_usb_midi MIDI I/O code

module_dfu Device Firmware Upgrade code

module_xmos_common Common build infrastructure

Figure 30:

USB Audio

Modules

app_usb_aud_l1 USB Audio 2.0 Reference Design code

app_usb_aud_l2 USB Audio 2.0 Multichannel Reference Design code

Figure 31:

USB Audio

Reference

Applications

4.3 A USB Audio Application (walkthrough)

This tutorial provides a walk through of the single tile USB Audio Reference Design

(L-Series) example, which can be found in the app_usb_aud_l1 directory.

In each application directory the src directory is arranged into two folders:

core

directory containing source items that must be made available to the

USB Audio framework

extensions

directory that includes extensions to the framework such as

CODEC conﬁg etc

The core folder for each application contains:

1. A .xn ﬁle to describe the hardware.

2. A custom deﬁnes ﬁle: customdefines.h for framework conﬁguration

ports.h

header ﬁle to contain the declarations of ports used in addition to

those declared in framework

4.3.1 Custom Deﬁnes

The

customdefines.h

ﬁle contains all the #deﬁnes required to tailor the USB audio

framework to the particular application at hand. First there are deﬁnes to determine

overall capability. For this reference design input and output, S/PDIF output and

DFU are enabled:

# i fndef AUDIO _CLAS S

# d efine AUDIO _CLAS S (2)

# e ndi f

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