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by sporex
Tue Nov 27, 2018 11:16 am
Forum: Troubleshooting
Topic: phantom USB stick
Replies: 3
Views: 166

Re: phantom USB stick

/media/USB must exist in order for a mount in /etc/fstab to work. A mount point is just a directory somewhere in the filesystem. Assuming permissions don't prevent it, you can write to /media/USB/foo when nothing is mounted there. In this case writes (and reads) are from whatever filesyatem and stor...
by sporex
Mon Nov 26, 2018 5:29 pm
Forum: Troubleshooting
Topic: phantom USB stick
Replies: 3
Views: 166

phantom USB stick

I have a headless Jessie Image (SD-card = read-only) that I want to distribute to 40 units. The image is running a apache2 server and a SW that writes HTML data to a mounted USB stick. The USB is mounted at boot in /etc/fstab with the following command: LABEL=PINGLOG /media/USB vfat utf8,uid=www-dat...
by sporex
Fri Jul 20, 2018 5:28 pm
Forum: Raspbian
Topic: one hw-resource for multiple processes : Raspbian
Replies: 0
Views: 102

one hw-resource for multiple processes : Raspbian

Sorry if this is a beginners question : is it possible to use a single HW resource for multiple processes? To be more precise : I'am streaming the microphone input of a USB sound card (ALSA) to a distant IP adress (RTP/UDP). This is already existing. So this is the process that has taken the ALSA ca...
by sporex
Mon Jun 25, 2018 1:16 pm
Forum: Graphics, sound and multimedia
Topic: Audio Stream Low Latency
Replies: 12
Views: 7223

Re: Audio Stream Low Latency

Try this Regards Jakobsen 1. Make sure you compile against this implementation / version of ortp ortp-0.22.0.tar.gz Get it from here : http://download.savannah.nongnu.org/releases/linphone/ortp/sources/ 2. I changed the opus encoder / decoder to int16 from float - due to my audio devices was simple...
by sporex
Thu Jan 25, 2018 11:57 am
Forum: Raspbian
Topic: manual reset UART
Replies: 0
Views: 205

manual reset UART

Hello, I am debugging a program (FreePascal) that connects to the serial port. The trouble is, that when I stop debugging, the serial port remains in the "connected state" and is unusable for any subsequent debugging session. Thus I have to reboot the RPi any time, before starting a new session. Doe...
by sporex
Mon Oct 16, 2017 7:46 am
Forum: Graphics, sound and multimedia
Topic: usb card gets hot
Replies: 5
Views: 1060

Re: usb card gets hot

I had the same problem and I found out that the 3.5mm output jack must NOT be directly connected to any ground! Hope this will resolve the problem.
by sporex
Thu Jan 19, 2017 9:27 am
Forum: Troubleshooting
Topic: Turning off Raspberry PI without proper shutdown
Replies: 19
Views: 22022

Re: Turning off Raspberry PI without proper shutdown

So I assume using a RPi3 and boot it via network, can NOT be a solution in this case? Could be a solution, but would not be the optimal one, as there are chances that the network is not entirely available at boot of the device. (LAN segments are spread over a number of microwave links) In the past ...
by sporex
Wed Jan 18, 2017 4:26 pm
Forum: Troubleshooting
Topic: Turning off Raspberry PI without proper shutdown
Replies: 19
Views: 22022

Re: Turning off Raspberry PI without proper shutdown

This is an interesting problem. I have never done this but I do have an idea which I think could work. The idea would be to create a ram drive in memory (ramfs) which you transfer a system to. You then chroot that as the main drive and then unmount the SD card ext4 partition. Do all that at boot ti...
by sporex
Sun Oct 16, 2016 2:12 pm
Forum: Other projects
Topic: Audiolink Project
Replies: 26
Views: 17336

Re: Audiolink Project

What is "aplay -l" showing you?

Next try "speaker-test -D plughw:1,0 ...."
by sporex
Sat Oct 15, 2016 7:03 pm
Forum: Other projects
Topic: Audiolink Project
Replies: 26
Views: 17336

Re: Audiolink Project

snd_pcm_open: No such file or directory I would argue, you used the wrong audio device. In my case, I have two USB sound adapters connected: (card0 and card1) Type aplay -l card 0: Set_1 [C-Media USB Headphone Set], device 0: USB Audio [USB Audio] Subdevices: 0/1 Subdevice #0: subdevice #0 card 1: S...
by sporex
Thu Sep 01, 2016 5:01 pm
Forum: Other projects
Topic: Audiolink Project
Replies: 26
Views: 17336

Re: Audiolink Project

The only flaw is that voice becomes unintelligible after some hours and tx must be restarted.
I have to add some corrections: I apparently compiled the 2012 version of TRX.
Now, after downloading and compiling the 2014 source code, the problem is solved.
by sporex
Wed Aug 31, 2016 11:41 am
Forum: General discussion
Topic: trx won't make: alsa libraries not found
Replies: 3
Views: 799

Re: trx won't make: alsa libraries not found

1.) apt-get install libopus-dev libortp-dev
2.) make
by sporex
Fri Aug 26, 2016 1:05 pm
Forum: Other projects
Topic: Audiolink Project
Replies: 26
Views: 17336

Re: Audiolink Project

Does anybody has done this with two raspberries? Yes. I am presently running a setup with two raspberries, each one running tx and rx (by Mark Hills) It provides a full duplex voice channel with very low latency. Only thing to observe: the rx part has to be launched before the tx part on the other ...
by sporex
Thu Jan 23, 2014 5:48 pm
Forum: For sale
Topic: 3.2" TFT LCD + touchscreen + five buttons
Replies: 101
Views: 77837

Re: 3.2" TFT LCD + touchscreen + five buttons

Syspro: resolution can not be changed, you will have to setup XWindows to fit the screen. I suggest you do this on a big screen which is connected to HDMI. Make everything (icons, fonts,...) as small as possible and then check the result on LCD-PI32. I have observed the same effect that Syspro has ...

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