Descriptors in XMOS USB Audio¶

ADAT Alternate Settings¶

6 interfaces

endpoint can only be shared between alternate settings of the same interface (not between interfaces)

change alternate settings via SET_INTERFACE request

an alternate setting has its’ own interface and endpoint descriptors

interface	type	alt.	endps.	note
0	AC		irq_in
1	AS	0		null interface
		1	iso_out iso_in	18 channels, host -> device, iso_in is feedback
		2	shared	18 channels
2	AS	0		null interface
		1	iso_in	18 channels, device -> host
		2	shared	14 channels
3	AC			MIDI
4	MS		bul_out bul_in
5	DFU

Interface 1: host -> device

Interface 2: device -> host

Structure of defines:

alt 0
alt 1
  18 ch
#ifdef ADAT
alt 2
  14 ch
#endif