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stefanhgm  
#1 Posted : Wednesday, August 7, 2019 10:27:13 AM(UTC)
stefanhgm

Rank: Member

Groups: Member
Joined: 11/4/2015(UTC)
Posts: 4
Germany

Hello.

I have problems to get my BBB-Hermes-Cronus-Buffalo-IIIsePro38 build to work. Right now the Buffalo does actually work with an external SPDIF signal fed in through the "GND" and "SPDIF" connectors and the Buffalo switch 1, position 1 to "ON" for SPDIF input. Then the "LOCK" LED lights up and I can listen to music. However, when I want to feed a signal from the BBB-Hermes-Cronus combo producing a PCM signal (for which I move the above switch to "OFF" for SERIAL(PCM/DSD) input) there is no sound. On the BBB I run the prepared Debian distro including Botic by twluke: Support for Botic Linux driver. Below are the outputs of some important commands:

For the connection between Cronus and Buffalo I tried u-Fl connectors as well as simple (short) wires. The problem is that I cannot find out whether Cronus really outputs a valid I2C signal and I also have no I2C source that I could use to debug the Buffalo.

I discussed this problem in the following thread already: Problems with BBB-Hermes-Cronus for Buffalo-IIIsePro38 build. I also posted some HighRes pictures there.

Here are some outputs of the BBB. I also tried to play a simple .wav file with no success.

Quote:
debian@arm:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Botic [Botic], device 0: external botic-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

debian@arm:~$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=Botic
Botic,
Default Audio Device
sysdefault:CARD=Botic
Botic,
Default Audio Device
dmix:CARD=Botic,DEV=0
Botic,
Direct sample mixing device
dsnoop:CARD=Botic,DEV=0
Botic,
Direct sample snooping device
hw:CARD=Botic,DEV=0
Botic,
Direct hardware device without any conversions
plughw:CARD=Botic,DEV=0
Botic,
Hardware device with all software conversions

debian@arm:~$ speaker-test

speaker-test 1.1.3

Playback device is default
Stream parameters are 48000Hz, S16_LE, 1 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 16 to 786432
Period size range from 8 to 393216
Using max buffer size 786432
Periods = 4
was set period_size = 196608
was set buffer_size = 786432
0 - Front Left
Time per period = 10.378743
0 - Front Left
Time per period = 10.239861
0 - Front Left
Time per period = 10.239897
0 - Front Left
Time per period = 10.239885
0 - Front Left
Time per period = 10.239877
0 - Front Left
Time per period = 10.239869
0 - Front Left
Time per period = 10.239883
0 - Front Left
Time per period = 10.239875


francolargo  
#2 Posted : Saturday, August 10, 2019 3:11:26 PM(UTC)
francolargo

Rank: Member

Groups: Member
Joined: 4/21/2007(UTC)
Posts: 55
Location: Minnesota

Greetings,

Often, the problem in this kind of situation comes from some basic mistake that we overlook because it is too obvious. For that, I suggest you post here hi resolution photos of your entire build - power inputs, jumper settings, everything. We mentioned the idea of using an oscilloscope to test for I2S from the Cronus. If nothing shows up in the photos, then that remains my second suggestion. It's not hard - it just takes some persistence like all of DIY audio.

Cheers!
stefanhgm  
#3 Posted : Sunday, August 11, 2019 6:43:11 PM(UTC)
stefanhgm

Rank: Member

Groups: Member
Joined: 11/4/2015(UTC)
Posts: 4
Germany

Hey francolargo,

thanks for your support. Here are the images. They are the same as the in diyaudio forum.
francolargo  
#4 Posted : Monday, August 12, 2019 3:15:59 PM(UTC)
francolargo

Rank: Member

Groups: Member
Joined: 4/21/2007(UTC)
Posts: 55
Location: Minnesota

It appears the orange ground wire for the I2S is attached at the Cronus side but not soldered into the B3. That's an important connection. Do I remember that uFl connections also didn't work? Those would carry the ground. Also, are the orange and white SPDIF wires leading from the B3 touching and shorting at their ends? [I assume that the blue power connection into Cronus is normally made?]

[Unrelated to your problem, I suggest you clean the soldering flux from the boards using a mild solvent...]

Edited by user Monday, August 12, 2019 4:00:58 PM(UTC)  | Reason: Not specified

stefanhgm  
#5 Posted : Tuesday, August 13, 2019 9:25:26 AM(UTC)
stefanhgm

Rank: Member

Groups: Member
Joined: 11/4/2015(UTC)
Posts: 4
Germany

Right, on the pictures the ground wire is not attached on the Buffalo side. But I tried it with ground soldered and not soldered. I also tried uFl connectors, right. But none of it worked.

The SPIDF wires were just for feeding in an SPIDF signal, which worked. I ensured that they are not shortened. Power supplies should work fine. I checked them all with a multimeter.
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