From: Alex Lee <lee188@singnet.com.sg>
To: Julian Scheel <julian@jusst.de>
Cc: alsa-devel@alsa-project.org, Daniel Mack <daniel@caiaq.de>
Subject: Re: USB asynchronous mode feedback format
Date: Fri, 15 Oct 2010 21:31:50 +0800 [thread overview]
Message-ID: <1287149510.2344.8.camel@desktop-alex> (raw)
In-Reply-To: <201010151504.56742.julian@jusst.de>
On Fri, 2010-10-15 at 15:04 +0200, Julian Scheel wrote:
> Ah right, thanks.
> Well now I swapped data[1] and data[2]. When monitoring the amount of data I
> get per read, it is constant at 192bytes, which would be expected for feedback
> ratio of 48, right? But if I have 0x06 to 0x07 for example I do still get
> exactly 192bytes per read, shouldn't I get less data in that case? (I always
> try to read up to MAXPACKETSIZE which is 512, btw)
Suggest:
(1) The feedback rate has to fall withing +/- 10% of the nominal rate.
Otherwise it is ignored.
(2) You need to find out exactly how many samples the host sends you.
Look at my sdr-widget code, for example. Then you read what the host
sends you.
(3) Do a > dmesg | tail
after unplugging and plugging your USB device in. Then you can see
whether there are any errors in your syncpipe
btw, what is your Linux kernel version?
Alex
next prev parent reply other threads:[~2010-10-15 13:31 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-14 8:47 USB asynchronous mode feedback format lee188
2010-10-14 10:27 ` Julian Scheel
2010-10-14 10:48 ` Daniel Mack
2010-10-14 11:01 ` Julian Scheel
2010-10-14 11:16 ` Daniel Mack
2010-10-14 11:32 ` Julian Scheel
2010-10-14 12:06 ` Daniel Mack
2010-10-14 12:30 ` Julian Scheel
2010-10-14 12:33 ` Daniel Mack
2010-10-14 12:56 ` Julian Scheel
2010-10-14 15:10 ` Julian Scheel
2010-10-14 15:33 ` Alex Lee
2010-10-14 15:39 ` Daniel Mack
2010-10-14 15:54 ` Julian Scheel
2010-10-14 16:11 ` Daniel Mack
2010-10-14 20:14 ` Julian Scheel
2010-10-15 8:59 ` Julian Scheel
2010-10-15 9:03 ` Daniel Mack
2010-10-18 16:53 ` Julian Scheel
[not found] ` <3879AFD1-61E6-47FB-8ECB-8A7D7B233B3B@singnet.com.sg>
2010-10-14 11:44 ` Julian Scheel
2010-10-14 11:56 ` Daniel Mack
2010-10-14 11:58 ` Julian Scheel
2010-10-14 15:28 ` Alex Lee
2010-10-14 15:43 ` Julian Scheel
2010-10-15 12:08 ` Julian Scheel
2010-10-15 12:52 ` Alex Lee
2010-10-15 13:04 ` Julian Scheel
2010-10-15 13:31 ` Alex Lee [this message]
2010-10-15 14:24 ` Julian Scheel
2010-10-15 14:34 ` Clemens Ladisch
2010-10-16 10:23 ` Julian Scheel
2010-10-15 14:41 ` Alex Lee
2010-10-15 17:16 ` Julian Scheel
2010-10-15 17:19 ` Julian Scheel
2010-10-16 1:52 ` Alex Lee
2010-10-16 10:25 ` Julian Scheel
2010-10-16 13:58 ` Alex Lee
2010-10-16 16:30 ` Julian Scheel
2010-10-16 18:52 ` Julian Scheel
2010-10-17 10:53 ` Julian Scheel
2010-10-17 11:16 ` Alex Lee
-- strict thread matches above, loose matches on Subject: below --
2010-10-13 15:50 Julian Scheel
2010-10-14 1:28 ` Alex
2010-10-14 5:57 ` Julian Scheel
2010-10-14 6:25 ` Alex
2010-10-14 8:46 ` lee188
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