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#rockbox log for 2012-11-14

00:00:27 Quit kevku (Ping timeout: 272 seconds)
00:02:16 Quit [Saint] (Read error: Connection reset by peer)
00:02:21saratogai see that
00:02:28saratogathey give quite a lot of analog control over the DAC
00:02:40pamaurysaratoga: the OF also adjusts bits in HW_AUDIOOUT_TEST
00:02:57saratogahave you changed HP_CLASSAB?
00:03:01pamauryyes
00:03:05saratogathats good :)
00:03:48saratoga"Testmode to connect headphone out left to the microphone input to the ADC, and speakerp to the ADC. This is used for analog loopback DAC-speaker-Mix-ADC Mode."
00:03:57saratogawow thats quite thorough
00:04:48pamaurythey have lots of loopbacks setups. You can redirect the dac dma to the adc one also to test the digital chain
00:05:09saratogado you know what bit they touch in the HW_AUDIOOUT_TEST register?
00:06:03pamauryiirc, they touch HP_I1_ADJ and/or HP_IALL_ADJ. For the others bits I'm unsure
00:06:35saratogai'd expect the defaults to be fine, but who knows
00:06:47saratogaif they require a different bias current that might explain your results
00:07:30saratogado you have a way to dump the registers after the OF sets them?
00:07:39pamaurynot really currently
00:08:16pamauryI would really like though
00:12:21pamauryI can try to disassemble the OF even more wrt to this, I don't really understand what it's all about but if you can interpret the meaning that's fine ^^
00:14:47 Quit kadoban (Ping timeout: 265 seconds)
00:15:43saratoganot really, just know that distortion means you're operating some analog bit outside of its design spec :)
00:15:58saratogaif you want something insightful thats harder
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00:17:19saratogaif they do touch HP_IALL_ADJ, it might be a good idea to try increasing the current and see if it helps
00:18:04pamauryok
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00:18:46pamauryI'm always impressed by the amount of test/debug bits in this chip, you can tweak everything !
00:19:16saratogaone other question: how high was the volume when you did that test?
00:20:29 Quit dfkt (Quit: -= SysReset 2.55=- Sic gorgiamus allos subjectatos nunc.)
00:20:45pamauryI don't remember exactly and comparing the OF with rockbox isn't easy. iirc it was between -20dB and -10dB I think but I might be wrong
00:21:38pamauryI use the DAC volume <=0 and the HP vol when >=0. That might not be optimal
00:22:18saratogabut you're sure it was low enough that you weren't clipping somewhere?
00:22:56pamauryI think so. I first tried with another volume and RMAA told me it detected some clipping so I did it again
00:23:21pamauryI can't tell for sure of course
00:24:06pamaurybut I used the same recording level for the OF and rockbox and both had comparable recording levels. So if it was clipping, it means the amplifier setup is not correct
00:24:23pamaury(in rockbox)
00:28:19pamaurythanks for your help, I'm going to bed
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01:20:25saratogapamaury: apply_volume looks odd to me
01:26:48 Quit yuriks (Ping timeout: 265 seconds)
01:29:14saratogaperhaps the DAC volume has some maximum level before it causes the headphone amp to saturate?
01:29:53saratogathe data sheet says rather cryptically "Do not change the DAC volume into or from the 0xFF state or else it will create a large pop. Remaining in the 0xFF state is acceptable if all of the volume control is done in the headphone."
01:30:03saratogawhich is odd since 0xFE is max gain
01:30:36saratogamight be interesting to see if fixing it at 0xFF and then just using the headphone amp works any better
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12:56:02pamaurymore imxtools \o/ The number of tools I developed for this target is impressive
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23:05:25AlexPscorche`: Are the forums down again?
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23:25:10scorche|shAlexP: doesnt look like it
23:25:20AlexPscorche`: they've come back :)
23:25:35AlexPbut they weren't responding for a while when I asked
23:25:42AlexPdownforevery.... agreed with me! :)
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