Go to advanced search

by Gavinmc42
Wed Oct 02, 2019 9:25 am
Forum: C/C++
Topic: C++ in real world, is it only me, or real world C++ is different from C++ in books and conferences?
Replies: 20
Views: 1199

Re: C++ in real world, is it only me, or real world C++ is different from C++ in books and conferences?

ALM, application lifetime management. In other words how long will the product be around for? Will it be replaced, software maintained and fixed/updates and for how long.... Android still runs a version 3.x Linux kernel. But think of old military stuff or infrastructure, power station, chemical plan...
by Gavinmc42
Tue Oct 01, 2019 10:24 am
Forum: General discussion
Topic: Wanting to build a car lcd instrument cluster
Replies: 16
Views: 556

Re: Wanting to build a car lcd instrument cluster

Good point - industrial uSD card and SLC type too which limits that to 8GB? Perhaps a Pi that boots from USB stick. I normally use PiCore for 24/7 Pi's as that OS runs from ram and so power outs generally don't affect it . uSD and power supply's are the main weak points. Pi's do have boot from SPI a...
by Gavinmc42
Tue Oct 01, 2019 6:01 am
Forum: Java
Topic: LibGDX on Buster
Replies: 12
Views: 4894

Re: LibGDX on Buster

Nice, WebGL is working. Have not touched Java since 8 and Processing since 1.5. OpenJDK/FX is new to me, had to install IDEA first. But processing and the graphics demos are very usable on Pi4's. Just before Pi's came out I was doing apps and prototyping on embedded PC's. Now I have come full circle...
by Gavinmc42
Tue Oct 01, 2019 5:25 am
Forum: General discussion
Topic: Wanting to build a car lcd instrument cluster
Replies: 16
Views: 556

Re: Wanting to build a car lcd instrument cluster

Yep Oz is a big nanny state, new cameras to fine people using mobile phones in cars now. Wonder if that law will still exist when we get driverless Ubers? All new electric cars should have air pollution monitors and dash cams to fine polluting vehicles. Mobile phone apps to avoid pollution areas, wh...
by Gavinmc42
Tue Oct 01, 2019 4:48 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPi3B+ and RPi4B)
Replies: 288
Views: 72452

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPi3B+ and RPi4B)

Or just wait until kernel 5.4 is released? Er, or wait until Sakaki can build -rc1 :lol: Apparently kernel compiles don't take much time these days? For someone who knows how :oops: If even the RPF guys are saying they are watching it closely then it must be a good one. That with mesa 19.3 should be...
by Gavinmc42
Tue Oct 01, 2019 4:22 am
Forum: General discussion
Topic: Wanting to build a car lcd instrument cluster
Replies: 16
Views: 556

Re: Wanting to build a car lcd instrument cluster

I'm hoping these guys can ramp up fast enough to do large displays for the Chinese education market. https://www.clearinkdisplays.com/ And we get some leakage quantities via Waveshare or Seeed Studio etc My car screen is useless in direct sunlight. Some of the Pi stiff I want to do is outdoors. As l...
by Gavinmc42
Mon Sep 30, 2019 12:27 pm
Forum: Advanced users
Topic: Moving Linux kernel to 4.19
Replies: 270
Views: 83522

Re: Moving Linux kernel to 4.19

interesting SPI stuff in 5.4, all those SPI based LCD get faster framerates? Got some 480 x 320 that have been borderline. Driver rewrites for them all? Hey, I have not even tested them on Pi4's yet, they are probably ok now anyway. Next size up is 640x480? How many SPI ports do we have on Pi4? :D 5...
by Gavinmc42
Mon Sep 30, 2019 11:30 am
Forum: General discussion
Topic: Wanting to build a car lcd instrument cluster
Replies: 16
Views: 556

Re: Wanting to build a car lcd instrument cluster

Before you start pulling your car apart, try making a virtual cluster on a display. You can get analog dial needles, most take two analog voltages as input So you will need DACs for that, these can be i2c or SPI based. Noticed my car had a HDMI input to the central media LCD, it also had a USB port ...
by Gavinmc42
Mon Sep 30, 2019 8:13 am
Forum: Other programming languages
Topic: The Rust debate.
Replies: 151
Views: 4125

Re: The Rust debate.

Gavinmc42 were you using the --offline option in cargo When I last looked at Cargo/Rust years ago I don't remember an offline version. Same sort of deal with Node.JS, my Pi's needed an internet connection. Manuals installs were just possible if only a few dependencies, too painful otherwise. Done b...
by Gavinmc42
Mon Sep 30, 2019 1:37 am
Forum: Other programming languages
Topic: The Rust debate.
Replies: 151
Views: 4125

Re: The Rust debate.

I don't know about dummies but the "Hello Cargo" chapter of the Rust book is about as simple as it can get: https://doc.rust-lang.org/book/ch01-03-hello-cargo.html Thanks Heater, finally I get it, Cargo is like a combo "make" and "git/svn". Any good IDEs that understand Cargo/Rust? I just discovere...
by Gavinmc42
Mon Sep 30, 2019 1:18 am
Forum: Gentoo
Topic: emerge, ebuild, binhost
Replies: 11
Views: 899

Re: emerge, ebuild, binhost

Thanks Sakaki, Been emerging crossdev stuff and genup. I'm not surprised, still mostly in the dark and bumping into walls with Gentoo. Fixed my broken Buster uSD, config.txt issue after an update/upgrade. Now suspect a similar issue with Gentoo64. Blinking green led is not blinking normally. More im...
by Gavinmc42
Mon Sep 30, 2019 1:06 am
Forum: General discussion
Topic: Raspberry Pi 4 constantly crashes and is overheating
Replies: 14
Views: 750

Re: Raspberry Pi 4 constantly crashes and is overheating

Yep, Power supply. You cannot just use any old power supply anymore. Especially cheap battery chargers which are NOT Power supplies. If you have a oscilloscope, monitor the 5V supply and watch it go all over the place. Drops in voltage do weird stuff. Buying the official power supply and you would h...
by Gavinmc42
Sun Sep 29, 2019 10:25 am
Forum: Other programming languages
Topic: The Rust debate.
Replies: 151
Views: 4125

Re: The Rust debate.

I tried to do some OpenGL in Rust last week.
Ran into Cargo issues and remembered why I gave up on Rust years ago.
Great language but Cargo ruined it for me.
Working behind a firewall means offline Cargo

Is there a Cargo for dummies tutorial?
by Gavinmc42
Sun Sep 29, 2019 10:00 am
Forum: General discussion
Topic: Raspberry Pi 4 constantly crashes and is overheating
Replies: 14
Views: 750

Re: Raspberry Pi 4 constantly crashes and is overheating

I'm using the old 2.5Amp official Power supply. Not using a USB SSD, so don't need the 3amp one I got yet. A small heat sink and the lid off the official case keeps the temp around 55C. This is my third Pi4, each one, 1GB, 2GB and this 4GB have no problems with Chromium and YT's. Good power supply A...
by Gavinmc42
Sun Sep 29, 2019 9:08 am
Forum: Gentoo
Topic: emerge, ebuild, binhost
Replies: 11
Views: 899

Re: emerge, ebuild, binhost

Broke my big version 64GB uSD Gentoo64. Did a genup and reboot and it did not boot :( Bit the uSD was still readable from a Pi3 with USB boot Gentoo64. So all my built packages and emerge were there. Is there a way to reinstall them from the packages and not rebuilding from source again? Going to ne...
by Gavinmc42
Sat Sep 28, 2019 4:55 am
Forum: General discussion
Topic: Update for Rpi Zero W?
Replies: 74
Views: 2187

Re: Update for Rpi Zero W?

For the price I don't know how they could beat it. Eben has noticed the Pi usage in IoT space. What could the RPF do there now that they have Desktop PC's that can be used for developing IoT stuff. The quantity of things in IoT space is Billions not Millions. What Pi product could fit in that market...
by Gavinmc42
Sat Sep 28, 2019 1:17 am
Forum: General programming discussion
Topic: How i can install my own os from cosmos to my rpi3?
Replies: 7
Views: 332

Re: How i can install my own os from cosmos to my rpi3?

X# is a HLA (High Level Assembler) for X86/X64 (ARM coming) assembly language https://github.com/CosmosOS/XSharp Might not be able to port Cosmos yet but if ARM support arrives then maybe. I think in the LInux world .NET is Mono? A google shows Mono seems to have better Arm support? .NET/Mono is no...
by Gavinmc42
Sat Sep 28, 2019 12:53 am
Forum: Other projects
Topic: 360 degree human presence detection
Replies: 16
Views: 645

Re: 360 degree human presence detection

Years ago I got some stainless steel thread, used by the Wearables crowd. I was going to make touch sensitive robotic teddy bears, but too many ideas not enough time. Lots of microcontrollers now have touch/proximity capability. Proximity would be more sensitive? https://www.cypress.com/documentatio...
by Gavinmc42
Sat Sep 28, 2019 12:07 am
Forum: General discussion
Topic: Pi 4 - full specification of VideoCore 6
Replies: 74
Views: 10592

Re: Pi 4 - full specification of VideoCore 6

As for VC4, there are four slices in the reference manual https://docs.broadcom.com/docs/12358545 p.13, so IMO there actually are four slices on VC4, and one of them is disabled due to yields. That reference manual seems to be the family reference manual, different part number. I noticed the 4 quad...
by Gavinmc42
Fri Sep 27, 2019 12:01 pm
Forum: General discussion
Topic: Pi 4 - full specification of VideoCore 6
Replies: 74
Views: 10592

Re: Pi 4 - full specification of VideoCore 6

Maybe we don't :( The mesa demo slang apps are reporting errors. Install CLinfo and check. Rats, it's masked in Gentoo64, er what does that mean? https://www.mesa3d.org/intro.html Mesa includes OpenCL. Just assumed because we had Mesa we got OpenCL too. Getting hard to keep track of this alphabet so...
by Gavinmc42
Fri Sep 27, 2019 8:32 am
Forum: Graphics programming
Topic: How to start OpenGL for RPI4
Replies: 4
Views: 446

Re: How to start OpenGL for RPI4

Most of the mesa demos work now https://www.mesa3d.org/download.html Some will work on Pi3B's if you use Gentoo64 which uses the OpenGL drivers. Have not tried them on 3B+/Buster. I have also got OpenGL working with Go and Free Pascal. Pi4 and OpenGl are pretty mainstream now, have a look at Linux O...
by Gavinmc42
Fri Sep 27, 2019 8:11 am
Forum: General discussion
Topic: Update for Rpi Zero W?
Replies: 74
Views: 2187

Re: Update for Rpi Zero W?

I'm just glad there is no shop I can walk into and buy one close by.
Otherwise I would have dozens by now :lol:

A 64bit dual core low power with sleep mode Zero would be nice.
But it has to be pink with rainbow sprinkles.

I wonder if it could be done with a K210?

Go to advanced search