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Commit 020c6f93 authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
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Documentation: usb: UAC2 function testing 



Summary of how to test UAC2 function of USB gadget.

Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent dae03586

Documentation/usb/gadget-testing.txt

+39 −0
Original line number Original line Diff line number Diff line
@@ -17,6 +17,7 @@ provided by gadgets. 
14. SERIAL function

14. SERIAL function

15. SOURCESINK function

15. SOURCESINK function

16. UAC1 function

16. UAC1 function

17. UAC2 function









1. ACM function

1. ACM function
@@ -614,3 +615,41 @@ Testing the UAC1 function 




device: run the gadget

device: run the gadget

host: aplay -l # should list our USB Audio Gadget

host: aplay -l # should list our USB Audio Gadget



17. UAC2 function

=================



The function is provided by usb_f_uac2.ko module.



Function-specific configfs interface

------------------------------------



The function name to use when creating the function directory is "uac2".

The uac2 function provides these attributes in its function directory:



	chmask - capture channel mask

	c_srate - capture sampling rate

	c_ssize - capture sample size (bytes)

	p_chmask - playback channel mask

	p_srate - playback sampling rate

	p_ssize - playback sample size (bytes)



The attributes have sane default values.



Testing the UAC2 function

-------------------------



device: run the gadget

host: aplay -l # should list our USB Audio Gadget



This function does not require real hardware support, it just

sends a stream of audio data to/from the host. In order to

actually hear something at the device side, a command similar

to this must be used at the device side:



$ arecord -f dat -t wav -D hw:2,0 | aplay -D hw:0,0 &



e.g.:



$ arecord -f dat -t wav -D hw:CARD=UAC2Gadget,DEV=0 | \

aplay -D default:CARD=OdroidU3