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by Gavinmc42
Tue Jun 19, 2018 5:45 am
Forum: Gentoo
Topic: ebuilding 64bit games
Replies: 0
Views: 31

ebuilding 64bit games

Now that I have both my Pi3B+'s working and compiling stuff like Mesa3D, I want to try some OpenGL games. Gaming pushes computers, I want to see how far the Pi3B+ can be pushed :D Warzone2100, 0AD, Supertuxkart are OpenGL games but there is no Aarch64 ebuilds for lots of things like these. In Raspbi...
by Gavinmc42
Sun Jun 17, 2018 9:17 am
Forum: Beginners
Topic: raspberry pi display
Replies: 3
Views: 146

Re: raspberry pi display

Got another 19" 1280 x 1080 Monitor the other week, $5 from Cash Converters.
The cable, HDMI to DVI can cost more than that ;)

I almost never use new monitors on Pi's.
The only time it gets to 1920 x 1080 is when I use TV's when traveling.
If I was into media/Kodi it might be different.
by Gavinmc42
Sun Jun 17, 2018 8:40 am
Forum: Advanced users
Topic: Trouble with real-time code
Replies: 13
Views: 438

Re: Trouble with real-time code

I think you are correct, provided that you use a stepper driver which takes step/direction inputs rather than raw waveforms (with raw waveforms you'd need both channels just to provide simple quadrature for a single motor). For real Stepper motor gadgets I use the Hybrid stepper motors, 17, 23 or 3...
by Gavinmc42
Sat Jun 16, 2018 11:46 am
Forum: Advanced users
Topic: Trouble with real-time code
Replies: 13
Views: 438

Re: Trouble with real-time code

I got jitter on stepper motors when software looping on Linux. I never really tried Joan's library because I had other issues with the i2c. Ultibo is my preferred way to make apps these days, never really noticed much jitter from OS interrupts. But I have not tested it properly, just made a two step...
by Gavinmc42
Fri Jun 15, 2018 1:21 pm
Forum: Automation, sensing and robotics
Topic: Detect presence of poison
Replies: 8
Views: 250

Re: Detect presence of poison

I have come across a few ways at work just because I work at a Uni ;) A reagent reacts to the compound and changes colour, ie fancy litmus paper. Think pregnancy test method. A PCR replicates DNA until there is enough to be detected by stokes shift florescence. FYI, Pi's Zero's make good PCR control...
by Gavinmc42
Thu Jun 14, 2018 12:42 pm
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 398
Views: 22058

Re: Raspberry Pi 3 B+ lockups

I suspect these are slightly out of spec SoC's Yep, borderline edge case, probably fine at 1399MHz ;) And I did get these two in the first batch for sale. It took 5-10 minutes before locking up at 1400MHz. Not sure how long they are tested for in the factory? Even though the temp reported was 58C i...
by Gavinmc42
Thu Jun 14, 2018 11:08 am
Forum: General discussion
Topic: Cheap Networking
Replies: 10
Views: 396

Re: Cheap Networking

You could used a RS485 chip attached to the UART and still use the CAT5 cable.
Full duplex needs 2 pairs.
by Gavinmc42
Thu Jun 14, 2018 6:23 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)
Replies: 43
Views: 7405

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)

Update, been running for hours at 500, 1300.
So most likely the ARM core freq was the cause of this lockup.
by Gavinmc42
Thu Jun 14, 2018 5:45 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 398
Views: 22058

Re: Raspberry Pi 3 B+ lockups

Pi3B+ is now fine at 500,1300.
Is there a way the VC4 can monitors the ARM cpu temp and drops the clock if the ARM locks up?
I did notice in lockup the SOC gets warmer.
by Gavinmc42
Thu Jun 14, 2018 3:31 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 398
Views: 22058

Re: Raspberry Pi 3 B+ lockups

Swapped SD card, lockup at 500,1400 within a few minutes.
No lockup at 500, 1300 yet.

So I conclude, at least on one of my Pi3B+s, lockup is arm core freq dependent.
by Gavinmc42
Thu Jun 14, 2018 2:13 am
Forum: Troubleshooting
Topic: Raspberry Pi 3 B+ lockups
Replies: 398
Views: 22058

Re: Raspberry Pi 3 B+ lockups

I have one Pi3B+ that consistently locks up. I use Gentoo64 and run the glxgears demo and the gears stop turning on lockup. Locked up with sdram_freq=500. arm_freq=1400 sdram_freq=450. arm_freq=1400 sdram_freq=400. arm_freq=1400 Edited config.txt - sdram_freq=400 arm_freq=1200 fixes the lockup on th...
by Gavinmc42
Thu Jun 14, 2018 2:04 am
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)
Replies: 43
Views: 7405

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)

vcgencmd was useful. I have one Pi3B+ that consistently locks up. I use the glxgears demo and the gears stop turning on lockup. Locked up with sdram_freq=500. arm_freq=1400 sdram_freq=450. arm_freq=1400 sdram_freq=400. arm_freq=1400 Edited config.txt - sdram_freq=400 arm_freq=1200 fixes the lockup o...
by Gavinmc42
Wed Jun 13, 2018 7:03 am
Forum: OpenGLES
Topic: Star Citizen on the Raspberry Pi?!
Replies: 23
Views: 952

Re: Star Citizen on the Raspberry Pi?!

It took me some time to notice the glxgears demo running in the screenshot. https://www.raspberrypi.org/forums/viewtopic.php?f=54&t=188448 I just got the Mesa3D demo stuff compiling on Gentoo64. https://www.mesa3d.org/install.html There is a simple 3D terrain demo that works ;) Lots of other demos r...
by Gavinmc42
Tue Jun 12, 2018 7:45 am
Forum: Graphics, sound and multimedia
Topic: Basic screen for raspberry pi zero w
Replies: 5
Views: 313

Re: Basic screen for raspberry pi zero w

Oh and there are push fit GPIO headers and display hats.
by Gavinmc42
Tue Jun 12, 2018 7:44 am
Forum: Graphics, sound and multimedia
Topic: Basic screen for raspberry pi zero w
Replies: 5
Views: 313

Re: Basic screen for raspberry pi zero w

I have seen someone use nylon fishing line woven through the GPIO holes. Then wires are friction fit into the holes, no soldering needed. Apart from HDMI displays every other type, SPI, I2C, DPI needed soldering. USB display? LCD/OLED character displays? Looks at Adafruit/Sparkfun displays and learn...
by Gavinmc42
Tue Jun 12, 2018 2:18 am
Forum: Off topic discussion
Topic: The Case for the Pi3A+
Replies: 103
Views: 13299

Re: The Case for the Pi3A+

Could the 3A+ use the older BCM2837? As the 3B+ becomes the top of the line, does that free up usage of the older part? 64 bit 4 cores is more important than max speed in my opinion. Does it need the new WiFi combo chip? Call it a 3A and the 3A+ has the faster WiFi/CPU. Actually would that make it a...
by Gavinmc42
Mon Jun 11, 2018 12:41 pm
Forum: Off topic discussion
Topic: The Case for the Pi3A+
Replies: 103
Views: 13299

Re: The Case for the Pi3A+

Much as I don't like weeing on peoples fireworks, any new A+ is quite a way away. Like, a REALLY long way.
I hear the little coconut shells clapping getting closer.

So no holding breath and back to my Zero's and 3B+'s, message received ;)
by Gavinmc42
Mon Jun 11, 2018 8:43 am
Forum: Off topic discussion
Topic: The Case for the Pi3A+
Replies: 103
Views: 13299

Re: The Case for the Pi3A+

Therefore, I would suggest a USB C socket is a natural choice for a quad-core SBC that does not have a built-in USB hub. Great point, but probably that means some sort of power ID interface? Using a 3A+ as USB boot smart camera will need much more power than 500ma. The 3A+ could be used for all sor...
by Gavinmc42
Mon Jun 11, 2018 8:27 am
Forum: General programming discussion
Topic: TUTORIAL: File Sorting on the Raspberry Pi
Replies: 19
Views: 996

Re: TUTORIAL: File Sorting on the Raspberry Pi

I have been using underscore _ for separation.
And those leading zero's are fun to play with when taking images, so I usually include the timestamp in the file name ;)
by Gavinmc42
Mon Jun 11, 2018 8:04 am
Forum: Automation, sensing and robotics
Topic: CCS811 sensor becomes slow after a few hours
Replies: 3
Views: 218

Re: CCS811 sensor becomes slow after a few hours

See if you can write the error logs to a file. I tried Python/smbus and shell script i2cget and both got errors even for a simple TMP112. The CCS811 might be more borderline than some, not all i2c chips work the same I found. Might get one to try. I never bothered to average temps. Read sensor, if e...
by Gavinmc42
Mon Jun 11, 2018 7:20 am
Forum: Automation, sensing and robotics
Topic: CCS811 sensor becomes slow after a few hours
Replies: 3
Views: 218

Re: CCS811 sensor becomes slow after a few hours

I tried lots of software to get reliable i2c comms with Linux , mostly temperature monitoring. Ended up getting rid of Linux and now use Ultibo. https://ultibo.org/forum/viewtopic.php?f=9&t=135&p=373&hilit=i2c+sensor#p373 Reading every 25ms is fast, I used to only read every 10sec or minute. Try a b...
by Gavinmc42
Sun Jun 10, 2018 12:47 pm
Forum: Gentoo
Topic: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)
Replies: 43
Views: 7405

Re: Updated 64-bit Gentoo Image for RPi3 Released (now also for RPI3B+)

First tests - booting up and shutting down , it runs on both my Pi3B+'s and both 16GB Sandisk A1 cards. Previous version had issues with one card and one Pi3B+ ;) Also seems to shut down much faster. No lockups yet on either Pi/SD combo :D 30+ minutes of testing each. With both going, I can stress t...
by Gavinmc42
Sun Jun 10, 2018 10:32 am
Forum: Automation, sensing and robotics
Topic: The wheels are working ... but the robot no :'(
Replies: 8
Views: 454

Re: The wheels are working ... but the robot no :'(

Adafruit have a blue metal geared version of those yellow ones https://www.adafruit.com/product/3802 You have large diameter wheels so you need slower turning gearmotors that have more torque. Not all of those 130 size hobby motors are the same, either. https://product.mabuchi-motor.com/search.html?...
by Gavinmc42
Sat Jun 09, 2018 5:20 am
Forum: Off topic discussion
Topic: The Case for the Pi3A+
Replies: 103
Views: 13299

Re: The Case for the Pi3A+

Yep most old grumps are only using Pi's until Prop2 shows up ;) Hmm Prop2 PCB on same footprint as a 3A+? Which will be first? A break at Pi4 is no problem, there is a history of that. USB3/C/Sata will dictate it anyway :lol: If the Pi4 comes out with the VC5 as the top of the line, cost amortizatio...
by Gavinmc42
Fri Jun 08, 2018 12:02 pm
Forum: Other programming languages
Topic: A Extended Pascal Implementation : CONCEPT.
Replies: 49
Views: 2667

Re: A Extended Pascal Implementation : CONCEPT.

Assuming Ultibo would be LCL capable: What would you have ? What would you call this ? All the graphical desktop functionality you would love - booting in 2 seconds Some way of using the hardware acceleration for LCL would make it much better ;) If we had LCl we would be using it just like a PC and...

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