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by Heater
Tue Mar 19, 2019 4:17 pm
Forum: Java
Topic: MAX485 + RPi + python
Replies: 2
Views: 30

Re: MAX485 + RPi + python

I'd probably start by not posting a Python question in the Java sub forum.
by Heater
Tue Mar 19, 2019 2:18 pm
Forum: General discussion
Topic: Wireless display
Replies: 7
Views: 131

Re: Wireless display

See this thread where they do just what you want: https://www.raspberrypi.org/forums/viewtopic.php?t=182681 Updating at 1000 times per second is almost certainly not possible. Why would you need such a high update rate anyway. A display will only refresh 60 times per second and the human brain viewi...
by Heater
Tue Mar 19, 2019 1:03 pm
Forum: General discussion
Topic: SSH fails at a certain Windows PC
Replies: 7
Views: 152

Re: SSH fails at a certain Windows PC

Can you ping from everywhere to everywhere? In both directions?

A -> B
A --> Pi
B -> A
B --> Pi
Pi -> A
Pi -> B

Ping by IP address first then host names.
by Heater
Tue Mar 19, 2019 12:56 pm
Forum: General discussion
Topic: Wireless display
Replies: 7
Views: 131

Re: Wireless display

zigbee: https://elelabs.com/products/elelabs_zigbee_shield.html https://hacks.mozilla.org/2018/02/how-to-build-your-own-private-smart-home-with-a-raspberry-pi-and-mozillas-things-gateway/ bluetooth: https://www.cnet.com/how-to/how-to-setup-bluetooth-on-a-raspberry-pi-3/ LoRa: https://www.hackster.io...
by Heater
Tue Mar 19, 2019 11:20 am
Forum: C/C++
Topic: c++ socket communication with raspberry pi
Replies: 2
Views: 52

Re: c++ socket communication with raspberry pi

sw117751, From what I can tell I need a server client solution, where my PC acts as the server and the pi acts as a client. There is a third option: Your PC acts as a socket client, your Pi acts as a socket client. "Where is the server?" you ask. Good question. There are many systems that have many ...
by Heater
Mon Mar 18, 2019 5:29 pm
Forum: C/C++
Topic: Compiling gcc Options
Replies: 25
Views: 346

Re: Compiling gcc Options

No, the GCC configure script is not "garbage". In general you are trying to build a compiler. Problem is you need a compiler to build the compiler, not to mention all the other dependencies required. It would be great if we could build GCC on Windows using Microsoft's VC or whatever. But no, you nee...
by Heater
Mon Mar 18, 2019 1:52 pm
Forum: General programming discussion
Topic: Mixing C and assembly?
Replies: 18
Views: 295

Re: Mixing C and assembly?

Do you mean pi64?
https://github.com/bamarni/pi64

I still have it running here. But it has not had an update for a long time. Does not work on the 3B+ I believe.

A certain Crazyhead90 has a fork which should work on 3B+.

It's all it bit to messy for me to bother with anymore.
by Heater
Mon Mar 18, 2019 11:26 am
Forum: Off topic discussion
Topic: Is ARM doomed?
Replies: 167
Views: 5427

Re: Is ARM doomed?

ejolson, Although a bit like confusing arithmetic with mathematics, the revised GCSE Computer Science curriculum includes much more than coding in Scratch and Python. Who is confusing arithmetic with mathematics? Whilst programming and computer science are very different things, I suspect it's best ...
by Heater
Sun Mar 17, 2019 9:31 pm
Forum: C/C++
Topic: Compiling gcc Options
Replies: 25
Views: 346

Re: Compiling gcc Options

You have a Pi. You can develop on the Pi out of the box. That saves all the pain of cross-compiling. Which is, as you see, I really bad pain if you have to build the cross-compiler first.
by Heater
Sun Mar 17, 2019 2:23 pm
Forum: General discussion
Topic: Does raspberry pi 3 have open source graphics drivers
Replies: 2
Views: 135

Re: Does raspberry pi 3 have open source graphics drivers

What do you mean by "full 3D acceleration".

I have used OpenGL/GLES from Qt and works pretty damn quickly. With the closed source firmware of the video core.

More open than using Nvidia under Linux on my PC.
by Heater
Sun Mar 17, 2019 12:17 pm
Forum: Off topic discussion
Topic: Hidden information about manufacturer.
Replies: 9
Views: 309

Re: Hidden information about manufacturer.

The Raspberry Pi Foundation was formed in 2008. Raspberry Pi (Trading) Ltd was formed in 2013. By then millions of Pi had been sold, which of course had MAC addresses registered to the Foundation.

It's natural that subsequent Pi would continue to use the Foundation's MAC address allocation.
by Heater
Sun Mar 17, 2019 12:01 pm
Forum: General discussion
Topic: Stuck with PHP 7.0?
Replies: 5
Views: 147

Re: Stuck with PHP 7.0?

Yes, "buster" is the name of the next version of the Debian, hence Raspbian, operating system.

No doubt by the time it is released there will be a new version of PHP out and again people will wonder why their OS is out of date.
by Heater
Sun Mar 17, 2019 8:53 am
Forum: Wanted
Topic: Want to buy 100 Qty. Compute Modules CM3+
Replies: 6
Views: 169

Re: Want to buy 100 Qty. Compute Modules CM3+

progressivedesigns,
...we don't want to let our customers/competitors know which parts we are using.
I betting that anyone with the desire and ability to clone your product will almost immediately guess it's a Pi. It's a wasted effort to try and hide it.
by Heater
Sun Mar 17, 2019 8:46 am
Forum: General discussion
Topic: Raspberry Pi Zero W for moderate volume applications
Replies: 21
Views: 583

Re: Raspberry Pi Zero W for moderate volume applications

What mess?

It's no more of a mess than the promotional offers you get in super-markets. Sometimes there, sometimes not.
by Heater
Sun Mar 17, 2019 8:43 am
Forum: Off topic discussion
Topic: Hidden information about manufacturer.
Replies: 9
Views: 309

Re: Hidden information about manufacturer.

The problem is that the MAC address gives away information about what your computer is. That is a security risk. If you are on an untrusted network, say WiFi, a potential attacker now has information that may be helpful to him. Arguably spoofing a your MAC address is a good idea in this case. On the...
by Heater
Sun Mar 17, 2019 8:33 am
Forum: Off topic discussion
Topic: Longest Raspberry Pi uptime
Replies: 71
Views: 45615

Re: Longest Raspberry Pi uptime

jahboater, The main thing about these 5-6 year up times is being an answer to questions about the Pi's longevity or Raspbian's stability. A handful of people reporting that they have had a Pi running for 5 years says absolutely nothing about the Pi's longevity or Raspian's stability. One way or the ...
by Heater
Sun Mar 17, 2019 4:27 am
Forum: Troubleshooting
Topic: Sources.List - managed to mess it up while trying to download OpenCPN
Replies: 3
Views: 70

Re: Sources.List - managed to mess it up while trying to download OpenCPN

In general one should not change /etc/apt/sources.list. Rather one should add sources to files under /etc/apt/sources.list.d That keeps things well ordered and helps avoid this kind of catastrophe. Just delete an incorrect sources file in /etc/apt/sources.list.d Also one should be very wary of addin...
by Heater
Sun Mar 17, 2019 3:17 am
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

Coming from the land of the 24-bit mainframe, smaller has always been better (with S/370 assembler you could address 4K with a general purpose base register, beyond 4K was a pain - code came out small). Well... Not THAT much of a pain. Need I tell you about the banking main posting program I had to...
by Heater
Sat Mar 16, 2019 7:14 pm
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

jahboater, Since when was drinking beer a totally pointless activity :) Beer is of course a prerequisite for building an industrial civilization. As James Watt wrote to his backer, Mathew Bolton (I paraphrase) : "You have some very skillful engineers who could build us a great engine. If only they c...
by Heater
Sat Mar 16, 2019 7:11 pm
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

ejolson, Even a factor of two performance improvement in the web browsing experience on Pi would be significant. It would indeed. Performance improvements are always welcome. I just don't think it is, or should be, a primary goal of the Pi. Not required for it's intended purpose. ...This reflects th...
by Heater
Sat Mar 16, 2019 6:28 pm
Forum: General discussion
Topic: design of a generic raspberry pi 3 form factor open source notebook cabinet?
Replies: 16
Views: 364

Re: design of a generic raspberry pi 3 form factor open source notebook cabinet?

The last thing we need is for the Pi Foundation to waste money on designing a notebook/laptop container for a Pi. The resulting device would be a miserably poor notebook/laptop. Not many would want it. There is no money in it. The Pine Book guys are even honest enough to say on their site that the P...
by Heater
Sat Mar 16, 2019 3:26 pm
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

jahboater,
I add, purely for amusement, even that has changed - yet again :)
...
And the compiler no longer uses loops.
Good grief.

So how does one create a binary that will run on any random x86 machine? Like say all the 64 bit ones.
by Heater
Sat Mar 16, 2019 3:22 pm
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

Fair enough.

We have a C versions at about 350 lines. Assembler will certainly be more.

I guess that is another reason why assembler is so poorly performing. We never get the code :)
by Heater
Sat Mar 16, 2019 1:46 pm
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

thagrol, Am I the only one that finds that unlikely? Compiled C code is, essentially, assembler and optomised, handcoded assembler code is often faster. No, you are not the only one. Hand coded assembler was often faster than compiled code back in the day. Although not by much even then. Now a days ...
by Heater
Sat Mar 16, 2019 10:33 am
Forum: Off topic discussion
Topic: Worried, Whatever-Speed
Replies: 47
Views: 865

Re: Worried, Whatever-Speed

jahboater, Its educational and fun. Quite so. Everyday I see people wasting countless hours playing soduku, filling in crosswords, pushing money into slot machines, watching TV, drinking beer and God knows what other totally pointless activities. It would be a bit rich for almost anyone to point out...

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