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by jahboater
Sun Sep 23, 2018 5:51 pm
Forum: General discussion
Topic: 7-zip build dependencies/instructions?
Replies: 7
Views: 18948

Re: 7-zip build dependencies/instructions?

For interest,
xz is widely available as standard now.
It compresses better than 7z and its usage is similar to gzip.
by jahboater
Sun Sep 23, 2018 7:41 am
Forum: Beginners
Topic: SD Card
Replies: 7
Views: 142

Re: SD Card

I suggest the A1 class cards that Sandisk produce. These are designed for purpose (rather than being designed for cameras). https://www.sdcard.org/developers/overview/application/index.html https://www.amazon.co.uk/SanDisk-microSDXC-Memory-Adapter-Performance/dp/B073JYVKNX/ref=sr_1_3?ie=UTF8&qid=153...
by jahboater
Sat Sep 22, 2018 6:36 pm
Forum: General discussion
Topic: New projects intended for large cards. Keep it small initially
Replies: 5
Views: 148

Re: New projects intended for large cards. Keep it small initially

1) There is no point to backing up an entire operating system image. If you need that OS again just download and install it again from wherever it came from. Keeping copies of most of that is huge, wasteful and pointless. +1 Actually +100! I only backup my programs, config files etc - which are qui...
by jahboater
Fri Sep 21, 2018 10:08 pm
Forum: Beginners
Topic: So i can install a third party 64-bit Linux OS in RPi 3 B+
Replies: 12
Views: 512

Re: So i can install a third party 64-bit Linux OS in RPi 3 B+

Have you tried using NEON in Aarch64? I think it should be much faster. The only differences as far as NEON is concerned is that aarch64 has 1) twice the number of registers, and 2) the new sensible register layout. The new NEON is also fully IEEE compliant - but that may well be ARMv8 in general. ...
by jahboater
Thu Sep 20, 2018 4:13 pm
Forum: Bare metal, Assembly language
Topic: Support For Bare Metal Programming
Replies: 4
Views: 179

Re: Support For Bare Metal Programming

If you just want to learn ARM assembler, I suggest this book: https://www.amazon.co.uk/ARM-Assembly-Language-Fundamentals-Techniques/dp/1482229854/ref=sr_1_1?ie=UTF8&qid=1537459887&sr=8-1&keywords=arm+assembly+language Also this one is worth a read: https://www.amazon.co.uk/ARM-A32-Assembly-Language...
by jahboater
Thu Sep 20, 2018 11:53 am
Forum: Beginners
Topic: So i can install a third party 64-bit Linux OS in RPi 3 B+
Replies: 12
Views: 512

Re: So i can install a third party 64-bit Linux OS in RPi 3 B+

I use gentoo which works well. https://github.com/sakaki-/gentoo-on-rpi3-64bit/ but 64-bit code uses more memory, and you're already pretty lean in that department. Code tends to be smaller in my experience. Here are the sizes for the same program across three platforms with the identical compiler a...
by jahboater
Wed Sep 19, 2018 1:11 pm
Forum: General discussion
Topic: Which Raspberry Pi Should I Buy
Replies: 27
Views: 635

Re: Which Raspberry Pi Should I Buy

I think that I am going to install Ubuntu. And then I will use OpenCV and ROS for image capture and analysis. Do try Raspbian as well - its the "official" OS for the Pi and is well optimized and well supported here. https://www.raspberrypi.org/downloads/raspbian/ WiFi would probably be a good thing...
by jahboater
Wed Sep 19, 2018 11:06 am
Forum: Troubleshooting
Topic: yellow bolt icon appears with sufficient power supply
Replies: 10
Views: 222

Re: yellow bolt icon appears with sufficient power supply

Here is the spec for the "official" PSU mentioned above:

https://docs-emea.rs-online.com/webdocs ... 4ba6b1.pdf

Firstly the cable is a very thick 18AWG, and secondly the cable is fixed, so the rated supply voltage is at the plug (e.g. the Pi end), not at the output from the adapter.
by jahboater
Tue Sep 18, 2018 11:31 am
Forum: Graphics, sound and multimedia
Topic: Problems with playing flac files
Replies: 3
Views: 132

Re: Problems with playing flac files

topguy wrote:
Tue Sep 18, 2018 9:59 am
Since FLAC is an open standard there should be no need for special plugins etc. The only thing they should need is that the "libflac8" package is installed.
Raspbian already includes libflac8 ...
Just install your choice of music player.
by jahboater
Sun Sep 16, 2018 7:10 pm
Forum: Python
Topic: Pi Python development on Windows
Replies: 8
Views: 320

Re: Pi Python development on Windows

and perhaps the only real difference between local development on a fast modern hi spec puter and remote development on the pi itself will be a faster build/compile, but since your probably better off building etc within the run environment as doing otherwise could introduce a whole new set of prob...
by jahboater
Sat Sep 15, 2018 6:03 pm
Forum: Other programming languages
Topic: launching C# code
Replies: 13
Views: 391

Re: launching code

The "Other programming languages" section would be more suitable.
by jahboater
Sat Sep 15, 2018 8:37 am
Forum: Other programming languages
Topic: launching C# code
Replies: 13
Views: 391

Re: launching code

As Heater said:

Code: Select all

sudo apt-get install mono-complete
gets you mono for the Pi.
by jahboater
Thu Sep 13, 2018 2:41 pm
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

Interesting. 0.4mm. For Intel PC's that would be ridiculous. The heat sink contact pressure is very large (4 large bolts on my PC here). Serious users might lap or polish the contact surface of the heat sink to maximize the metal to metal contact area. Great care goes into the choice of TIM. For the...
by jahboater
Thu Sep 13, 2018 10:50 am
Forum: Beginners
Topic: should I upgrade to the 3b+ ?
Replies: 12
Views: 292

Re: should I upgrade to the 3b+ ?

The thermal management improvements should not be understated. The CPU clock speed has gone up by 200MHz which is 16.7%, but the reduced throttling gives rather more benefit for very large, long running, jobs. I first noticed this when the new GCC was released. GCC took 6.5 hours to build on a 3B, w...
by jahboater
Thu Sep 13, 2018 6:51 am
Forum: Beginners
Topic: should I upgrade to the 3b+ ?
Replies: 12
Views: 292

Re: should I upgrade to the 3b+ ?

W. H. Heydt wrote:
Thu Sep 13, 2018 3:44 am
Reasons to convert...
Slightly higher default clock.
Improved thermal control (not just the heat spreader on top....find and read the blog post from when it launched.
Improved Ethernet speed.
Added 5GHz WiFi
And an improved WiFi antenna ...
by jahboater
Wed Sep 12, 2018 7:14 pm
Forum: Raspbian
Topic: what to do with 64GB micro sd?
Replies: 28
Views: 786

Re: what to do with 64GB micro sd?

Heater wrote:
Mon Sep 10, 2018 6:20 pm
It's sad but true that in the decades we have had computers and even standardized languages like C we have not come up with a universal standard for even simple graphics or GUI interfaces.
For a text based windowing interface, curses is standardized by X/Open.
by jahboater
Wed Sep 12, 2018 6:46 pm
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

Yea, the Flirc numbers could probably be improved with a better thermal pad, but I haven't gotten near throttling temps, even in the summer when it's much hotter here. I wonder if some very thin (0.5mm or less) washers were placed under the board mounting holes, raising the height of the board very...
by jahboater
Wed Sep 12, 2018 6:19 pm
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

HawaiianPi, thank you very much for your results. There is a tiny advantage for the black finned heat sink, but for practical purposes the two cooling solutions have similar class leading performance - at least close enough not to make it worth while changing, especially if the case solution is pref...
by jahboater
Mon Sep 10, 2018 6:50 pm
Forum: General programming discussion
Topic: Truly portable lightweight GUI toolkit?
Replies: 17
Views: 530

Re: Truly portable lightweight GUI toolkit?

I have not met a DOS, RISC OS, Atari or Amiga user for over twenty years. I think I would say at least 30 years for the last time I saw real DOS (not the DOSBOX emulator). Very odd, I wonder what the 18 DOS users do with it? DavidS, The Sonoran Desert must be very beautiful - I envy you! (I used to...
by jahboater
Mon Sep 10, 2018 6:42 pm
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

The blessing and the curse of RPi 3B and 3B+ is that they are very close to a decent substitute of a desktop PC. Very close I would say. I recently "house-sat" someones else house while they were away on holiday. Rather than take a big Intel PC or a laptop, I took a 3B+, a 19in monitor, mouse and k...
by jahboater
Mon Sep 10, 2018 11:39 am
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

jahboater, cpuburn got my RPi 3B+ to 80C in 70sec and caused it to go down beyond 1200 :? So, I think, the marvelous temps you get a mainly due to the Kintaro heatsink, although I should admit that 3B+ is a step from 3B in right direction. Cpu burn is a stress test and not representative of normal ...
by jahboater
Mon Sep 10, 2018 10:18 am
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

Readings from your RPi made me jealous :roll: I've just installed a set of heatsinks that I bought earlier, but even during light browsing temp stays around 55C. What heatsink do you use? And can your share the script you used to measure temp, freq, and voltage? If you want to test a heat sink, thi...
by jahboater
Mon Sep 10, 2018 9:50 am
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

Readings from your RPi made me jealous :roll: I've just installed a set of heatsinks that I bought earlier, but even during light browsing temp stays around 55C. What heatsink do you use? And can your share the script you used to measure temp, freq, and voltage? Please see the script in my last pos...
by jahboater
Mon Sep 10, 2018 9:46 am
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

HawaiianPi, If you have some spare time, please could you run this on a 3B+ in a FLIRC case, noting the ambient temp. I am interested in how it compares to the Kintaro heatsink. The log in my prior post was run at 24C ambient, giving a delta-T of 23C at the peak temp during the run. You may need "su...
by jahboater
Mon Sep 10, 2018 9:20 am
Forum: Beginners
Topic: Inconsistency in the performance of RPi 3 B+
Replies: 31
Views: 608

Re: Inconsistency in the performance of RPi 3 B+

Following you advice, I have added temp_soft_limit=70 into /boot/config.txt and it seems to work, although the first run produced very strange results with avg 147ms :roll: the consequent run gave avg 32.71ms shooting temp to almost 70C very fast. I think you should look into the cooling. If you lo...

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