Minor Update to Portsdown Buster

Discussion about this major DATV Project. See also https://wiki.batc.org.uk/The_Portsdown_Transmitter
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G8GKQ
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Minor Update to Portsdown Buster

Post by G8GKQ » Thu Jul 30, 2020 9:41 pm

I have published a minor update to Portsdown Buster 2020 this evening that adds support for the Logitech B910 (sometimes marked as the C910) Webcam. This is the webcam that responds to lsusb with:

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Bus 001 Device 011: ID 046d:0823 Logitech, Inc. HD Webcam B910
The update will not add support for any other webcams or change anything else, so there is no need to do the update unless you have this specific model of WebCam.

Thanks to Tony G0AZQ for the loan of the webcam that was used in designing and testing this update.

Dave, G8GKQ

dc1op
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Re: Minor Update to Portsdown Buster

Post by dc1op » Thu Aug 06, 2020 12:54 pm

Hi,
just updated my portsdown system from a 2020 march version to version 202007310. Minilime FW was left as was/is. The System now shows 2 hickups:

1. advanced note: I am measuring the lime output after a cabledriver. So the output was previously adjusted to 18 dBm in the old set-up. When now txing with the updated system the output Comes up 18 dBm for approx. 3 seconds and then drop to 13 dBm. Stopping txing and activate it again the output comes up to 18 dBm for a glimpse and than drops again. ??

2.Accessing an USB stick on the raspi via putty is not possible as it is not mounted. Is that possibly a bug or planned? In the older SW versions it was comfortably possible to exchange the testcard file for example.

Any support will be appreciated.
Hub, dc1op

G8GKQ
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Re: Minor Update to Portsdown Buster

Post by G8GKQ » Thu Aug 06, 2020 1:16 pm

Hi Hub

Your update will have updated the linux kernel to the latest version which has caused some changes. However, there should be no difference in the output levels. Please tell me what modulation, freq, SR, video source, output device (normal or LimeDVB) and I will check.

USB automount is working for me but you may have to look in /media/usb0. I get:

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pi@raspberrypi:~ $ ls -l /media/usb0
total 8
-rwxr-xr-x 1 root root  722 Feb  2  2019  portsdown_config.txt
-rwxr-xr-x 1 root root  722 Feb  2  2019  portsdown_config.txt.bak
-rwxr-xr-x 1 root root 1684 Feb  2  2019  portsdown_presets.txt
-rwxr-xr-x 1 root root 1684 Feb  2  2019  portsdown_presets.txt.bak
drwxr-xr-x 2 root root 1024 Jun 23 21:49  portsdown_settings
drwxr-xr-x 2 root root  512 Feb  1  2019 'System Volume Information'
Dave

dc1op
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Re: Minor Update to Portsdown Buster

Post by dc1op » Fri Aug 07, 2020 10:52 am

Hi Dave,

thank you for looking after that matter.

Here are the data requested: Raspi 3B+ / DVB -S2 / H264 / Lime Mini / 2408.75 / SR 333 / FEC 2/3 / Testcard / Lime Gain 82

Re USB: this is what I get with the usb stick pluged in:

pi@raspberrypi:~ $ cd /media
pi@raspberrypi:/media $ cd usb0
pi@raspberrypi:/media/usb0 $ ls -la
total 8
drwxr-xr-x 2 root root 4096 Mar 21 20:03
drwxr-xr-x 10 root root 4096 Mar 21 20:03
pi@raspberrypi:/media/usb0 $ cd
pi@raspberrypi:~ $ ls -l /media/usb0
total 0
pi@raspberrypi:~ $

That looks to me as if the Operation System is faulty

73, Hub

G8GKQ
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Re: Minor Update to Portsdown Buster

Post by G8GKQ » Fri Aug 07, 2020 1:36 pm

Hi Hub

I have the same problem (no automount of USB Stick) on one of my RPi 3Bs with Portsdown Buster 2020. Not sure what the problem is, but I think that it has been caused by the recent kernel upgrade.

So not a Portsdown problem really, but I would like to hear of a solution if you find it. I've had a look, but there is nothing obvious.

Dave, G8GKQ

G8GKQ
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Re: Minor Update to Portsdown Buster

Post by G8GKQ » Fri Aug 07, 2020 3:41 pm

Hub

I think that the following works to restore access to USB drives:

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sudo systemctl edit systemd-udevd
This should open a file in your default editor (nano?). Add the following to the service file and save (ctrl-x, y, enter) afterwards:

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[Service]
PrivateMounts=no
Then restart udevd:

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sudo systemctl restart systemd-udevd
Acknowledgement to https://unix.stackexchange.com/question ... wer-kernel
Now I need to work out how to do this from a script during the install.

Dave, G8GKQ

dc1op
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Re: Minor Update to Portsdown Buster

Post by dc1op » Sat Aug 08, 2020 7:31 am

Hi Dave,

thanks for the code correction lines. I will try that and let you know here.

In the meanwhile I prepared a brandnew card with the SW from GitHub (as usual). This version seems to run properly as far as one can trust the information from the screen,
but
* it does not deliver the PTT Signal (which I use to control the cabledriver prior to the PA), so no output to the PA, but the Mini Lime is flashing green when txing.
* the shutdown signal is not coming, the LED is always unlit. (I only fitted the LED, not the button)

Hub, dc1op

G8GKQ
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Re: Minor Update to Portsdown Buster

Post by G8GKQ » Sat Aug 08, 2020 1:09 pm

Hi Hub

Have you enabled the shtdown button? Menu 3, System Config, SD Button Disabled/Enabled. It is disabled by default.

Not sure about the problem with the PTT. It is working on my latest Portsdown 2020 fresh build.

Dave

G8GKQ
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Re: Minor Update to Portsdown Buster

Post by G8GKQ » Sat Aug 08, 2020 1:14 pm

Hi

I've just noticed this bug report which may be related to problems with USB devices: https://github.com/raspberrypi/linux/issues/3779

It seems that some combinations of USB Hubs and FTDI adapters (as used in the MiniTiouner) trigger a permissions bug. The experts are working on it.

Dave, G8GKQ

g0mjw
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Re: Minor Update to Portsdown Buster

Post by g0mjw » Sat Aug 08, 2020 2:57 pm

Perhaps it's FTDIGate re-applied to Linux and breaking stuff... These days I steer clear of FTDI if possible as I am not sure I trust the company any more given what they were prepared to do. However, it's more likely a Kernel change that's gone awry.

Mike

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