Go to advanced search

by ghans
Sat Feb 22, 2020 7:33 am
Forum: Troubleshooting
Topic: Hardware acceleration on RPi 1
Replies: 6
Views: 443

Re: Hardware acceleration on RPi 1

The Raspberry Pi 1 is too old to have full OpenGL 2(?)/3 compatibilty via the VC4 Mesa/DRM driver. You will have to use the "legacy" firmware-based Broadcom OpenGL ES 2 stack, which was used to power Qt5 (and probably Kivy, been too long) with impressive results.

ghans
by ghans
Sat Feb 01, 2020 8:10 am
Forum: General discussion
Topic: Difference between Bootloader and Firmware?
Replies: 3
Views: 862

Re: Difference between Bootloader and Firmware?

Yes, the "bootloader" (used to be bootcode.bin) and firmware (start.elf) are related, but different "files" (the bootloader in the Pi4 is stored directly in EEPROM, not on an SD card) .

ghans
by ghans
Fri Jan 03, 2020 2:52 pm
Forum: Java
Topic: Lib for USB-HID-Gadget-Mode?
Replies: 9
Views: 2199

Re: Lib for USB-HID-Gadget-Mode?

Sorry, the functionality is called epoll().

https://github.com/dvlopt/linux-epoll.java

ghans
by ghans
Wed Jan 01, 2020 12:26 pm
Forum: Java
Topic: Lib for USB-HID-Gadget-Mode?
Replies: 9
Views: 2199

Re: Lib for USB-HID-Gadget-Mode?

Did you check if you can use poll()/select() from Java ? Those Linux-specific syscalls seem to be built
for this very purpose.

ghans
by ghans
Sat Nov 30, 2019 9:20 am
Forum: Graphics, sound and multimedia
Topic: Record video on pi
Replies: 8
Views: 944

Re: Record video on pi

Use the "signal" mode of raspistill. You can send an "UNIX signal" to raspistill and it will toggle between recording/paused. Search for "signal" on the raspistill documentation page.

ghans
by ghans
Sat Nov 16, 2019 10:18 am
Forum: Advanced users
Topic: How to hw-disable the Raspbery Pi-4 Wlan-/Sd-Card Controller CYW 43455 (aka BCM43438)
Replies: 29
Views: 2736

Re: How to hw-disable the Raspbery Pi-4 Wlan-/Sd-Card Controller CYW 43455 (aka BCM43438)

No, the WiFi chip is not acting as an SD card controller on any Raspberry Pi. All Raspberries habe two SD card controllers, and on the models with WiFi one is used to control the WiFi chip, while the other controls the SD Card.

ghans
by ghans
Fri Nov 15, 2019 1:09 pm
Forum: Troubleshooting
Topic: RAID5: Remove all drives prevents boot
Replies: 6
Views: 643

Re: RAID5: Remove all drives prevents boot

Try adding the "nofail" option to your md entry in the fstab. systemd hard-fails the boot process if drives are missing by default.
Are you using an initrd or initramfs ?

ghans
by ghans
Tue Oct 22, 2019 5:25 pm
Forum: Graphics, sound and multimedia
Topic: Stream video through radio system
Replies: 2
Views: 1816

Re: Stream video through radio system

Post a link to the datasheet and product page of your "radio module". Nobody can help you properly otherwise.

ghans
by ghans
Sun Oct 13, 2019 10:52 am
Forum: Beginners
Topic: multiple cameras?
Replies: 6
Views: 907

Re: multiple cameras?

No, you will need 4 cameras AND 4 Raspberries for true simultaneous operation.

ghans
by ghans
Tue Oct 08, 2019 2:25 pm
Forum: Media centres
Topic: Raspberry Pi as HDMI wireless transmitter/receiver?
Replies: 15
Views: 5455

Re: Raspberry Pi as HDMI wireless transmitter/receiver?

The HDMI ports on any Raspberry Pi are output only.

ghans
by ghans
Sun Sep 01, 2019 6:46 pm
Forum: General programming discussion
Topic: Raspberry pi sound processor
Replies: 3
Views: 1016

Re: Raspberry pi sound processor

Can you draw a picture/flowchart of the final process (including eventual D-A and A-D conversions) ? I have some ideas, but we might not be talking about the same thing.

ghans
by ghans
Sat Aug 31, 2019 7:58 am
Forum: General discussion
Topic: Can Raspberry Pi 4 play HEVC 1080p videos?
Replies: 11
Views: 24473

Re: Can Raspberry Pi 4 play HEVC 1080p videos?

LibreELEC is a Linux-based OS which solely runs the media center software "Kodi".
It is not a general-purpose operating system (no package management, for example).

ghans
by ghans
Wed Aug 28, 2019 1:08 pm
Forum: Deutsch
Topic: Sensordaten parallel abfragen
Replies: 11
Views: 1928

Re: Sensordaten parallel abfragen

Ehrlich gesagt solltest du gleich deinen Code posten, alles andere wird Glaskugel-Lesen bleiben.

ghans
by ghans
Tue Aug 20, 2019 12:50 pm
Forum: Beginners
Topic: Looking for advice on the feasibility of a project
Replies: 5
Views: 641

Re: Looking for advice on the feasibility of a project

Do you have software developers on your team ? This might be possible without developers, but i would doubt it would be a sensible use of your (non-developer ?) teams time or resources. The easiest solution which would not need developer involvement would be trying to get FreedomBox or PirateBox run...
by ghans
Thu Aug 15, 2019 7:30 pm
Forum: Deutsch
Topic: CSI Interface
Replies: 7
Views: 2363

Re: CSI Interface

Ja, aber dieser Standard operiert auf einem sehr niedrigen Abstraktionsniveau, Plug-and-Play ist nicht vorgesehen. Schon gar nicht auf Software-Ebene. Ist ein Ding von der Industrie für die Industrie, Consumer hätten ihn nie zu Gesicht bekommen sollen. Vergleiche DSI (Display Serial Port) und HDMI (...
by ghans
Thu Aug 15, 2019 7:22 pm
Forum: Deutsch
Topic: CSI Interface
Replies: 7
Views: 2363

Re: CSI Interface

Der Pi nur unterstützt nur Kameramodule der Foundation. Drittmodule werden von der closed source GPU-Firmware nicht unterstützt, noch enthält sie das jeweils notwendige Grob-und-Feintuning der ISP-Pipeline.

ghans
by ghans
Tue Aug 06, 2019 5:39 pm
Forum: Troubleshooting
Topic: Reading data from USB microphone in C/C++
Replies: 2
Views: 491

Re: Reading data from USB microphone in C/C++

As long as you are using Linux, you should read up on ALSA. It is the foundation on which advanced solutions like PulseAudio and JACK are built. It might be sensible to bypass those.

ghans
by ghans
Tue Aug 06, 2019 5:33 pm
Forum: General discussion
Topic: May I use the RUN pin holes on Raspberry pi 3 like on/off, putting a switch?
Replies: 3
Views: 645

Re: May I use the RUN pin holes on Raspberry pi 3 like on/off, putting a switch?

Only if you are fine with a forceful reset and data loss or even SD card corruption.

ghans
by ghans
Tue Jul 16, 2019 5:28 am
Forum: Beginners
Topic: Do I HAVE to use LibreOffice?
Replies: 14
Views: 2578

Re: Do I HAVE to use LibreOffice?

Did you install LibreOffice from the "app store" (package manager) ? Using package management makes installing software much safer and convenient, and also takes the Pis ARM CPU into account. The package manager on Raspbian is called APT. Incidentally, Ubuntu uses the same system because it is a des...
by ghans
Mon Jul 15, 2019 5:03 am
Forum: Bare metal, Assembly language
Topic: Kernel switcher... kernel?
Replies: 4
Views: 1781

Re: Kernel switcher... kernel?

The Raspberry Pi does not support UEFI out-of-the-box. What people (or companies like Microsoft and SuSE) have been doing is to replace the file kernel.img with an (U)EFI implementation (either TianoCore or uboot + EFI emulation patches). It seems to work well enough. Obviously, this adds another st...
by ghans
Sun Jul 14, 2019 9:04 am
Forum: Graphics, sound and multimedia
Topic: Raspberry As Audio Output Device
Replies: 24
Views: 7116

Re: Raspberry As Audio Output Device

The Raspberry Pi can output audio easily over 3.5mm line-level jack and HDMI. If you want audiophile quality though, you should avoid the default analog output.

ghans
by ghans
Thu Jul 11, 2019 5:26 am
Forum: Deutsch
Topic: Einige USB-Typ-C-Ladegeräte erkennen Raspberry Pi 4 nicht
Replies: 3
Views: 860

Re: Einige USB-Typ-C-Ladegeräte erkennen Raspberry Pi 4 nicht

Nein. Es ist eher, dass standardkonforme Netzteile anderer Hersteller nicht funktionieren.

ghans
by ghans
Tue Jul 09, 2019 3:56 pm
Forum: General discussion
Topic: RPi2 v1.1 vs RPi2 v1.2 Differences
Replies: 5
Views: 733

Re: RPi2 v1.1 vs RPi2 v1.2 Differences

The Raspberry Pi 2B v1.1 uses a BCM2836 System-on-a-Chip (ARM Cortex-A7/ARMv7). The Raspberry Pi 2B v1.2 uses a BCM2837 System-on-a-Chip (ARM Cortex-A53/ ARMv8-A). Thanks to Raspbian, the difference is made irrelevant in practice. Also the Raspberry Pi2 version 1.2 was underclocked in comparison to ...

Go to advanced search