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by Gavinmc42
Mon Dec 09, 2019 3:07 am
Forum: OpenGLES
Topic: Rpi4 - OpenGL - X - alpha channel - possible?
Replies: 2
Views: 2844

Re: Rpi4 - OpenGL - X - alpha channel - possible?

Did you figure this out?
Been trying to do this too.
It is weird, none of the Linux world stuff works, yet in Gentoo64 I can turn transparency to any value when grabbing and moving a window.
Done with the compositing manager?
by Gavinmc42
Mon Dec 09, 2019 2:53 am
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 165
Views: 4556

Re: Tatami Pi Fun.

They excel at 3D to 2D transforms, and some cryptographic algorithms.
Crypto? Cool, thanks, my ignorance of that field is staggering, time to learn.
Accelerate ssh/ssl? Just used up all my crypto knowledge :oops:
by Gavinmc42
Mon Dec 09, 2019 2:42 am
Forum: General discussion
Topic: Raspberry Pi as security camera
Replies: 3
Views: 183

Re: Raspberry Pi as security camera

I have both Motion Eye OS and Pikrellcam on Raspbian Lite, mostly on B's and B+'s Motion Eye OS has a streaming option instead of recording on the Pi. A Pi4 with decent HDD might be able to record a few Pi's streaming. USB storage on Pi4 is still evolving, bit of potluck with the USB at the moment. ...
by Gavinmc42
Mon Dec 09, 2019 2:20 am
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 165
Views: 4556

Re: Tatami Pi Fun.

Not a general solution for multi-threading.
Apart from graphics what can be benchmarked on the VC4 and VC6?
The graphics stuff depends on drivers and for the Pi4 that is mesa/x11, not suitable for baremetal.
FFT's?
by Gavinmc42
Mon Dec 09, 2019 1:39 am
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 165
Views: 4556

Re: Tatami Pi Fun.

I suspect this sieve-like algorithm would be easier to code for the VC6 shaders of the Pi. I have been finding python useful/quicker for shader test coding and hence I'm trying to use learn that. Might have to go back to Raspbian to get these working. VC4 https://github.com/nineties/py-videocore VC...
by Gavinmc42
Sun Dec 08, 2019 11:54 am
Forum: Beginners
Topic: Will I burn my RPI if I accidentially provide a large voltage to any 3.3v GPIO pin?
Replies: 15
Views: 370

Re: Will I burn my RPI if I accidentially provide a large voltage to any 3.3v GPIO pin?

I once connected 12v to a GPIO pin years ago on a old B. It toasted that pins circuit and the 5V zener protection diode. But it still seemed to work after I took off the shorted zener. How much extra damage did to other parts of the circuit I don't know. It did reboot and run fine except that pin di...
by Gavinmc42
Sun Dec 08, 2019 11:49 am
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 10
Views: 218

Re: Device not detected using i2c-detect y 1

You have Vin on 3V3? That circuit is designed for 5 and 3V3 operation, those always confuse me. Putting 5V Arduino stuff on 3v3 Pi's. Looks like there is a 5 to 3V3 regulator on Vin. And it looks like 3V comes out the 3VO pin A circuit shows when used on a 3V Feather CS is connected to 3V3 on Vin. L...
by Gavinmc42
Sun Dec 08, 2019 7:58 am
Forum: Advanced users
Topic: VL805 firmware release 0137ac - improved USB downstream power switching
Replies: 14
Views: 840

Re: VL805 firmware release 0137ac - improved USB downstream power switching

It is for people that want to power cycle their USB devices. All of the ports get turned off/on together though.
Could be useful for USB powered Pi Zero's when they are USB booting.
Not sure if there will be mouse/keyboard conflicts, test via VNC?
by Gavinmc42
Sun Dec 08, 2019 7:45 am
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 10
Views: 218

Re: Device not detected using i2c-detect y 1

I usually have bunch of i2c units and even have a USB based i2c tester I use on Windows. If i2c-detect is not working I have a PC test unit and also PI testing using baremetal with Ultibo. If these don't detect the i2c uni then it is usually a wiring/datasheet misread. Do you have any other i2c devi...
by Gavinmc42
Sun Dec 08, 2019 7:34 am
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 165
Views: 4556

Re: Tatami Pi Fun.

Speaking of which, it would be great to see a mixed-language solution to the tatami challenge created using Pascal with inline ARM assembly. I was thinking a Basic interpreter written in Pascal with GPU inline asm for acceleration, all done in baremetal. VC6 computer shaders are on the way, hoping ...
by Gavinmc42
Sun Dec 08, 2019 2:21 am
Forum: General programming discussion
Topic: Tatami Pi Fun.
Replies: 165
Views: 4556

Re: Tatami Pi Fun.

I have acquired a collection of cameras and microphones over the years. One purpose was to utilize the existing network of Biological Processing Units in the neighbourhood. Been learning AI and looking for a computer language as a UI to the AI/NN/ML network running on the Pi's. Biological Analysis S...
by Gavinmc42
Sun Dec 08, 2019 1:41 am
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 10
Views: 218

Re: Device not detected using i2c-detect y 1

Check and see if there is a file /dev/i2c-1
If it is not enable it will not be there.
by Gavinmc42
Sun Dec 08, 2019 1:36 am
Forum: General discussion
Topic: Device not detected using i2c-detect y 1
Replies: 10
Views: 218

Re: Device not detected using i2c-detect y 1

The wiring looked correct for i2c.
You have enabled i2c in raspi-config?
by Gavinmc42
Sun Dec 08, 2019 12:46 am
Forum: Beginners
Topic: Position sensing
Replies: 3
Views: 91

Re: Position sensing

Don't high end VR gear include 2 handsets?
How do they work?
Rift, Oculus?
by Gavinmc42
Sat Dec 07, 2019 11:41 am
Forum: Troubleshooting
Topic: Installing x86 on ARM
Replies: 17
Views: 357

Re: Installing x86 on ARM

Or ask TI nicely for the source code of the Calculator app. That would be orders on magnitude easier than getting x86 code working. All that windowing emulation stuff, yuk. Someone with a scope could probably even reverse engineer the serial protocol https://www.ticalc.org/ More googling might find ...
by Gavinmc42
Sat Dec 07, 2019 11:28 am
Forum: Advanced users
Topic: Moving Linux kernel to 4.19
Replies: 278
Views: 90631

Re: Moving Linux kernel to 4.19

The Mainline 5.5 has only very little Pi4 support from a user perspective (No PCIe, USB, thermal or V3D support). Btw 5.5 is no LTS release. There is USB keyboard and mouse in 5.3 Ubuntu, so they needed to tweak that? PCIe is Ethernet? Ubuntu reported Mesa 19.2 which is V3D aware. LTS is not an iss...
by Gavinmc42
Sat Dec 07, 2019 11:12 am
Forum: Compute Module
Topic: What else is there besides Raspberry Pi..?
Replies: 19
Views: 504

Re: What else is there besides Raspberry Pi..?

Last Android 8 phone cost me $35, works fine and reports everything I do on it to ??? Don't use a sim card, so it's just a small tablet, great for watching The Expanse or reading OpenGL manuals in bed etc. It just works and is very convenient. The Pi's on the other hand make usable desktops and are ...
by Gavinmc42
Sat Dec 07, 2019 10:51 am
Forum: Graphics programming
Topic: Open GL 2.1 on RPi 4
Replies: 6
Views: 416

Re: Open GL 2.1 on RPi 4

I got a similar error, the clue was this.
GLSL 3.30 is not supported. Supported versions are: 1.10, 1.20, 1.00 ES, and 3.00 ES\n',
use version 300 es

Every Mesa upgrade I keep checking glxinfo for ES 3.1, that could happen anytime.
I don't know how to use the GLX extension, lots of those now.
by Gavinmc42
Sat Dec 07, 2019 10:46 am
Forum: HATs and other add-ons
Topic: RPi + PS3Eye getting Sound-microphone
Replies: 20
Views: 19573

Re: RPi + PS3Eye getting Sound-microphone

Thanks John, Time to find my box of spare Eyecams ;) Been installing python opencv stuff, the PI4 should be fast enough to be useful. Have not tried any sound level detection with the Eyecam since Pi2 days. Pyaudio? Ubuntu server + Desktop is working now on Pi4, for those that want to try and test o...
by Gavinmc42
Sat Dec 07, 2019 10:36 am
Forum: Advanced users
Topic: Moving Linux kernel to 4.19
Replies: 278
Views: 90631

Re: Moving Linux kernel to 4.19

Just been using 5.3 on the new release Ubuntu Server. Don't care enough about Ubuntu to do much more than install a Desktop and see if it worked. It did, seems slower and takes longer to boot. I have seen a bunch of Pi commits going into 5.0+. Wondering why 4.19 is till been worked on? That post loo...
by Gavinmc42
Sat Dec 07, 2019 10:24 am
Forum: Ubuntu
Topic: Eoan re-release: Call for testing
Replies: 15
Views: 402

Re: Eoan re-release: Call for testing

I had to install a Desktop ad then remembered why I swapped to Mint. Chunky icons. But it is working, if a bit slow and only using one screen. Not a beginners OS but for Ubuntu fans it is not bad and should only get better. A very slow boot and it seems to stop at a flashing underline cursor until t...
by Gavinmc42
Fri Dec 06, 2019 7:29 am
Forum: Ubuntu
Topic: Eoan re-release: Call for testing
Replies: 15
Views: 402

Re: Eoan re-release: Call for testing

Seems to be booting and logging in ok on 3B+ and 4B4.
Better this time, but you should have login and password on that page for initial usage, so a search is not needed :D

or link to this
https://ubuntu.com/download/raspberry-pi
by Gavinmc42
Fri Dec 06, 2019 3:01 am
Forum: Compute Module
Topic: What else is there besides Raspberry Pi..?
Replies: 19
Views: 504

Re: What else is there besides Raspberry Pi..?

Any phone type hats? GSM or LTE or ????? You could make a retro Motorola brick phone. Or use BLE for a Dick Tracy watch style mic/speaker to a Pi/Hat in a backpack. Even an old wooden wall mount rotary style phone, with handheld speaker on a cable. Too hard to make a Pi phone the size of modern one,...
by Gavinmc42
Fri Dec 06, 2019 2:32 am
Forum: Compute Module
Topic: Smart Camera (EagleEYE) based on CM3+
Replies: 5
Views: 159

Re: Smart Camera (EagleEYE) based on CM3+

The 5MP OV5647 was the first gen Pi camera.
The 8MP IMX219 Pi camera has a crypto chip on the PCB to stop cloning.

More pixels slows computer vision code down, often 300x300 pixel is enough.
by Gavinmc42
Fri Dec 06, 2019 2:20 am
Forum: General discussion
Topic: execute code after connected with internet
Replies: 8
Views: 291

Re: execute code after connected with internet

I usually have two checks that run in a loop on boot. First one checks to see if the Pi has an ip address yet. The second checks to see if the NTP server has set the time. If your Pi has an ip address and the correct time then basically you are connected to a network. That is not connecting to the i...

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