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Old 6th December 2012, 08:27 PM   #1931
borges is offline borges  Norway
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Hi guys,

I found a bug in the feedback code I wrote back in October. Even with the bug in, stability seems to be good. Still, what I believe to be improved code is checked into branch audio-widget-experimental and compiled into awx_20121206.elf

Please help out with testing the UAC2 playback on Linux, Mac and Windows. My own tests on Win7-64 are good.

Also, there have been some reports that UAC1 was noisy on Mac OS X. If you can help out with UAC1 tests of the newest updates, that would be very good. I hope recent changes for Macs haven't broken UAC1 support elsewhere. I don't have a Mac to test with here. (See below for details.)


The UAC2 code uses something like a 4-point P-regulator. (The October version had a bug which actually turned it into a 3-point P-regulator with asymmetrical thresholds.) I found the bug and added even more stability to the regulator using a simulator in Octave. Let me know if anyone's interested in the source code for that :-)

Before October the UAC2 code used a 2-point thermostat regulator. The UAC1 code in this update also uses a 2-point thermostat regulator. If there are observations of rarely-occuring mid-music noise in UAC1 I can port the 4-point P-regulator to UAC1. But I don't think I'll try to fix that before it turns out to be a problem.


Cheers,
BÝrge
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Old 6th December 2012, 08:48 PM   #1932
1audio is offline 1audio  United States
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Quote:
Originally Posted by Catal View Post
It's the filter setting in the widget control software.

As I said to Borges, I know that this selection is "only" possible for the PCM5102 dac, ... cause AK4430 datasheet says clearly that only fir filter can be used, ... that I should hear no difference between these two options.

Frank
I can't find a reference to filtering in the AK4430 datasheet. You get what it has, only.
I don't think that gpio goes anywhere on the AB1.2. Maybe Borge can enlighten us?
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Old 6th December 2012, 08:50 PM   #1933
1audio is offline 1audio  United States
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Do I need to use Widget control to flash the firmware now? I had become used to the command line process. I'll try the new firmware over the next few days.
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Old 6th December 2012, 08:51 PM   #1934
borges is offline borges  Norway
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That's right Demian,

that GPIO line is not used in the AB-1.2.

BÝrge
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Old 6th December 2012, 08:58 PM   #1935
borges is offline borges  Norway
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Quote:
Originally Posted by 1audio View Post
Do I need to use Widget control to flash the firmware now? I had become used to the command line process. I'll try the new firmware over the next few days.
Widget Control doesn't do any flashing. You'll need the command line from Atmel's Flip program. Full description in the Readme file in my signature.

BÝrge
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Old 6th December 2012, 08:59 PM   #1936
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I just upgraded mine to the latest fw using cli on win7. worked fine. (whew!)

I see this on linux, now:

Code:
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: AB12 [QNKTC USB DAC AB-1.2], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
this changed the naming in my alsa state file:

Code:
state.AB12 {
        control.1 {
                iface MIXER
                name 'Clock 2 Playback Switch'
                value.0 true
                value.1 true
                comment {
                        access 'read write'
                        type BOOLEAN
                        count 2
                }
        }
and it used to be

Code:
state.DG8SAQI2C {
this caused me to have to re-edit my alsa state file (I do weird things with it, so I have to, lol) but was there a reason the name had to change?
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Old 6th December 2012, 09:02 PM   #1937
borges is offline borges  Norway
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The name change happened with the change to unique USB VID/PID codes. Now George and I use different "product name" strings.

BÝrge
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Old 6th December 2012, 09:06 PM   #1938
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will this new one be stable for a while? or even forever?
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Old 6th December 2012, 09:07 PM   #1939
borges is offline borges  Norway
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Originally Posted by linuxworks View Post
will this new one be stable for a while? or even forever?
If it tests good on all platforms, yes!

BÝrge
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Old 6th December 2012, 09:17 PM   #1940
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btw, the elf file size grew dramatically. that almost threw a red flag to me, before I started the download to the device.
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