Raspberry Pi tricks and tips
Various tricks and tips for users of Raspberry Pis, mainly with Raspbian distribution. These tips and tricks grows over time.
Raspberry Pi
Building Qt 5.12 LTS for Raspberry Pi on Raspberry Pi OS
How to build up-to-date Qt 5.12 LTS release with proper hardware acceleration support for Raspberry Pi on Raspberry Pi OS (aka Raspbian) Debian Buster.
A quick and bad Raspberry Pi 3 32-bit & 64-bit OpenSSL speed test
I wanted to make a quick test if there is difference or not as the Pi people keeps telling us that there isn't or not large enough to support a native 64-bit userland.
And there seems to be, but, this test is very bad in multiple ways. Different versions of just about everything was used (glibc for 32-bit, musl for 64-bit, different gcc versions for building, etc) and also because raspbian is built for armv6 it will loose from the start.
These are just preliminary finds so take them with a grain of salt. Still, interesting...
And there seems to be, but, this test is very bad in multiple ways. Different versions of just about everything was used (glibc for 32-bit, musl for 64-bit, different gcc versions for building, etc) and also because raspbian is built for armv6 it will loose from the start.
These are just preliminary finds so take them with a grain of salt. Still, interesting...
Qt on Raspberry Pi guide updated
The tutorial on building Qt 5.10 on Raspberry Pi has been tested and checked, added more details on optional packages and a workaround for issues with Broadcom OpenGL librarie filenames on default installations. The same instructions have also been tested on the latest version, 5.11.1 and found to work just fine (just adjust version in downloads and commands!).
Grab H.264 video on Raspberry Pi with gstreamer
(More like a note to self this.)
Load Video4Linux driver:
sudo modprobe bcm2835-v4l2
Grab some video into Matroska container:
gst-launch-1.0 v4l2src ! video/x-h264,framerate=30/1 ! h264parse ! matroskamux ! filesink location=test.mkv
In Full HD:
gst-launch-1.0 v4l2src ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! matroskamux ! filesink location=test.mkv
Load Video4Linux driver:
sudo modprobe bcm2835-v4l2
Grab some video into Matroska container:
gst-launch-1.0 v4l2src ! video/x-h264,framerate=30/1 ! h264parse ! matroskamux ! filesink location=test.mkv
In Full HD:
gst-launch-1.0 v4l2src ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! matroskamux ! filesink location=test.mkv
Build Qt Creator 4.12 on Raspberry Pi
Tutorial on how to build native Qt Creator 4.12.2 to run on a Raspberry Pi, against Qt 5.12 or later.
Building Qt 5.10 for Raspberry Pi on Debian Stretch
Raspbian based on Debian Stretch comes with an old (5.7.1) version of Qt that is already outdated and missing some features and modules. Afaik there are no up-to-date backports so the only way to get an up to date version version of Qt with all features enabled running on your Pi is to build it yourself.
Setup a Raspberry Pi for headless use with USB serial console
Instructions on how to prepare a Debian Raspbian for headless USB serial console use on a Raspberry Pi Zero, Zero W, A and A+ boards using USB OTG (gadget) mode. Note that these are the only models where it is possible to do so as they don't have a USB hub and the OTG mode is available for use.
Raspberry Pi tutorial updates
Various Raspberry Pi related tutorials has been updated and fixed. There is now a new tutorial for building Qt on Raspbian Stretch, a QtQuick example and various updates to the 64-bit tools and kernel build tutorials.
Testing QtQuick on Raspberry Pi
So now you have a shiny new Qt build on your Raspberry Pi. Now what ? Testing!
This tutorial presents a very simple, sort-of a Hello World QtQuick applications.
Start your favorite editor (nano, vi, emacs, editor-of-choice) and paste the following code into it and then save it as main.qml