Raspberry Pi Forums

sibir

So I received the same USB-C hub Kevin was using and I see the same problems and they are clearly not caused by the Labrador board confusing the channels. Connecting the Labrador board directly to the USB-C port (while powering the RPi via the header) avoids much of the trouble, but still, there are...

sibir

@Kevin, I suspect what you are seeing is related to https://github.com/EspoTek/Labrador/issues/98.
The bad voltages may belong to channel 2. Turn on the second channel and check.

But then I do not see the issue on a Mac or PC...

The dwc2 driver has been working very reliably for me.

sibir

Hmm, also Rev 1.1 but the USB-C hub feeds through the power and attaches the Labrador. I have to get me one of those. My USB-C hub (VAVA) is fancier and does not work with my RPi. Your bad voltages do look different from mine. My initial hope was a bug in the UI software. So I captured the USB data ...

sibir

As I mentioned, my power-through USB-C hub did not work and I wonder if the problem is the bad USB-C circuit of the Rev 1.1 RPi 4s, which shows the RPi 4 as an audio dongle to the USB-C port. (If you have lived under a rock see https://www.raspberrypi.org/forums/viewtopic.php?t=249975 ) Kevin, is yo...

sibir

My first hope was to use a power-through USB-C hub with USB-A ports. However, the one I have (VAVA VA-UC006) does not even register as a hub ( works fine on Mac and Dell) and also did not send the power through. But my RPi 4 is first gen, missing the 2nd resistor. Maybe it would work on the newer on...

sibir

How to put the USB-C hub into host mode is described here: https://www.raspberrypi.org/forums/viewtopic.php?t=246348 . So I powered my RPi 4 via the GPIO pins, added "dtoverlay=dwc2,dr_mode=host" to /boot/config.txt and rebooted. The hub shows up now with lsusb -t and I can connect the Labrador boar...

sibir

I also had the SSH server running. Connecting to WiFi apparently woke it up and caused trouble. Now with all interfaces disabled (except I2C for the RTC) I can even use the mouse's scroll wheel to change the display range of the Labrador display. Would you know of a way to make the preferences stick?

sibir

I had the VNC server enabled and even though there was no connection (even no cable plugged in nor WiFi enabled) I was getting error -9. Once I turned off the VNC server things looked good and stable, but as soon as I enabled WiFi error -9 was back and things went haywire. I think there should be a ...

sibir

Sorry, no help from me, but I ran into the same issue with my new Pi 4 under Buster (stable 4.19.97-v7l+ kernel). I also tried the new 4.19.115-v7l+, but still the same libusb_claim_interface FAILED. But my Labrador board also does not run smoothly on my older Pi 3B+ under Buster. I get errors with ...

sibir

Looking for a quick how-to I was surprised not to find anything (easily) here. So if you want to permanently disable the caps-lock key on the keyboard for the user "pi" and you are running Buster, add this line @setxkbmap -option caps:none to your /etc/xdg/lxsession/LXDE-pi/autostart You need root-a...

sibir

I was not even using Python, I was using Joan's pigs. But using Python it looks pretty much the same. It was my understanding that all the timing is handled by the C code of the pigpio demon. Why would C do better then? Also, interrupts delay events in my experience, but the 10 us pulses are cut sho...

sibir

Running Joan's terminal code on my RPi3B+ under Buster creates 201 pulses of varying length (between 2 and <10 us). What's going on?

sibir

I have been using Thonny for a while and really like it. I love the multi-platform support as I am switching between Win10, macOS, and RPi all the time. Now that my projects are getting bigger the feature I miss most are collapsible function definitions to save screen real estate and reduce scrollin...

sibir

I found a solution:

create a fresh SD card with Jessie 2017-02-16 which last included Mathematica 10.3.1
mark wolfram-engine to not be upgraded with
Code: Select all
```
$ sudo apt-mark hold wolfram-engine
```
the do the usual upgrades

sibir

In the DOS days there also was the ingenious "Derive", which used amazingly few resources and probably would fly on the Pi.
Comprehensive list here: https://en.wikipedia.org/wiki/List_of_c ... ra_systems

sibir

I wrote some Mathematica code reading data fast from a TCP device. It works reliably under 10.3.1 but not version 11 or 12. Any idea idea how to install version 10.3 now? "sudo apt-get install wolfram-engine" installs version 12.0.1 and "apt-cache madison wolfram-engine" only shows that version as c...

sibir

Which source code did you use?

sibir

Dan,

your DropBox link does not work anymore, any other way I could look at your code?

Thanks,
Martin

Search found 18 matches

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