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STM32F407 Isochronous Feedback problem

ostapmelnyk
Associate
Posted on October 03, 2013 at 00:36

Hello everyone,

I'm currently working on a USB application on a STM32F407, using the Audio Class,

I

trying to run asynchronous mode

with the explicit

feedback through

feedback EP,

and after some long work and extensive reading USB specification and Audio Class specification of course, I am stuck.

I am using

STM OTG Driver v2.1

and

a modified example of

USB

audio.

I described the

end

point for

the explicit feedback

in the tag

and index

it in the

field

bmSync

in OUT

EP

, but he

can not wait to

EPIN

interrupt

for

this point

.

The device is

detected correctly

, I changed

the sample rate

and so on

, everything works

ok,

except for

the synchronization

...

How should

send

feedback data

synchronization

?

Would it be of any help if I tried the explicit feedback approach, which is needed for an async sink? Maybe

anyone has

sample code for

STM32F4

?

In any

case

, I would be

grateful

for any input on the subject

.

I can

provide some

of my code

if necessary.

I apologize

for my English

.

#audio-usb-asynchronous
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