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by knobby67
Tue Jun 20, 2017 8:03 am
Forum: Graphics programming
Topic: opengl what to use to draw a window
Replies: 2
Views: 1929

opengl what to use to draw a window

Hi All, I'm converting some software over from pc to raspberry pi. I've managed to get the code up and running using SDL2 to draw and open windows. However it's very slow, 1 FPS. I've found examples of how to compile SDL2 so it uses graphics acceleration, however when I try it doesn't work. I've spo...
by knobby67
Tue May 30, 2017 10:40 am
Forum: OpenGLES
Topic: OpenGL/SDL2 issue
Replies: 3
Views: 4012

Re: OpenGL/SDL2 issue

Hi I came to make almost exactly this post. What I'm doing is porting code to pi. It uses opengl and sdl2. I installed all the sdl2 stuff with apt-get. When I compiled my code it ran painfully slow, 1-2 frames a second. After some searching I found I need to go into raspi-config and set the G1 GL ( ...
by knobby67
Fri May 26, 2017 5:57 pm
Forum: Graphics programming
Topic: SDL2 + Assimp = tiny screen
Replies: 0
Views: 844

SDL2 + Assimp = tiny screen

Hi All, I'm converting some fully working pc code over to the rasp pi, this compiles fine, thought taking a long time :s. However when I run the code, using sdl2 and assimp model importer the screen draw area is tiny, by this I mean in full screen on my 19" monitor the screen appears to be about the...
by knobby67
Wed Oct 19, 2016 8:08 am
Forum: General discussion
Topic: using teamview issue
Replies: 5
Views: 1255

Re: using teamview issue

That should be permanent password not email :S
by knobby67
Wed Oct 19, 2016 7:58 am
Forum: General discussion
Topic: using teamview issue
Replies: 5
Views: 1255

Re: using teamview issue

Hi Thanks, didn't realise I'd had replies, as didn't get email :s. I will contact you. Tried above and get access forbidden? Not sure what to do? I have restarted multiple times, with multiple pass words give out, no joy. I tried setting a permanent email, still no joy. Any advise I would be thankfu...
by knobby67
Tue Oct 11, 2016 2:30 pm
Forum: General discussion
Topic: using teamview issue
Replies: 5
Views: 1255

using teamview issue

Hi All, I've used teamview quite a bit over the years so was excited to see it on raspberry pi at last. However try as I might I can't get it to accept a password. I get a connection it asks for a password, I enter it, then says "the password you have used is invalid... try again" I'm a bit confused...
by knobby67
Mon Sep 26, 2016 10:02 am
Forum: Automation, sensing and robotics
Topic: Can any of the IO pins be set for USB
Replies: 3
Views: 749

Can any of the IO pins be set for USB

Hi All,
can any of the IO pins be set to use as usb?
Thanks
by knobby67
Tue Aug 09, 2016 10:35 am
Forum: Automation, sensing and robotics
Topic: connecting multiple SPI devices
Replies: 3
Views: 777

Re: connecting multiple SPI devices

Thanks,
that was one of my thoughts, but wasn't sure if I could pass SPI through a chip.
But that seems a great idea.
by knobby67
Tue Aug 09, 2016 9:58 am
Forum: Automation, sensing and robotics
Topic: connecting multiple SPI devices
Replies: 3
Views: 777

connecting multiple SPI devices

Long story, I need top connect 5 SPI devices, however these devices,( LCD's ) have no select lines. So I need a way of having multiple SPI out, I thought about big banging, but seems to use a lot of IO. Then checked out nxp i2c to spi ic's, but need to buy in large numbers. Does anyone else have sol...
by knobby67
Tue Jul 26, 2016 8:37 am
Forum: Off topic discussion
Topic: PCB power plug
Replies: 3
Views: 2663

PCB power plug

Hi All, I'm trying to use Eagle to design a PCB based on a project I've been working on. My project work on a bread board ( lots of wires :D ) so I'm going to try and make a PCB. I have no experience of this and have hit a roadblock at a power plug. I need 5v and 12v so I thought I'd use a standard ...
by knobby67
Fri Jul 01, 2016 8:22 am
Forum: C/C++
Topic: use debugger on raspberry pi via ssh viewer
Replies: 3
Views: 1168

Re: use debugger on raspberry pi via ssh viewer

Hi
I'm using SSL/SSH VNC viwer. It jas buttons cert, ssl, ssh, ssl+ssh, none.
If I connect using ssl button my passwork doesn't work. I also can see anyway of using +x switch with it?
by knobby67
Thu Jun 30, 2016 11:22 am
Forum: C/C++
Topic: use debugger on raspberry pi via ssh viewer
Replies: 3
Views: 1168

use debugger on raspberry pi via ssh viewer

Hi All I'm running ssh viewer on a ubuntu machine to communicate with my raspberry pi. I'm trying to debug on the raspberry pi, I installed ddd on the raspberry pi and tried to run it. however when I type ddd test, it shows an error "client is not authorized to connect to server error: cant open dis...
by knobby67
Tue May 17, 2016 7:56 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i2c buffers and extenders when to use
Replies: 1
Views: 472

i2c buffers and extenders when to use

Hi All, I've been looking at i2c circuits. Sometimes for the same ic they add extenders and/or buffers. I can imagine why you use extenders, but can anyone explain why and when you'd use a buffer? Is the good participate or do you use if you have lots of i2c ics on the same bus. Thanks eg these sort...
by knobby67
Mon May 16, 2016 3:36 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: fitting a i2c ic to an adapter
Replies: 5
Views: 798

Re: fitting a i2c ic to an adapter

Thanks any advise welcome. I've bough a soldering iron and some wire to solder with. Next I need to find out and buy some flux. Another trip to RS :D
by knobby67
Mon May 16, 2016 2:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: fitting a i2c ic to an adapter
Replies: 5
Views: 798

Re: fitting a i2c ic to an adapter

Yes. Ahh. I can't even get the legs on the adapter to solder. The legs on the ic are like the width of a hair!
by knobby67
Mon May 16, 2016 2:42 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: fitting a i2c ic to an adapter
Replies: 5
Views: 798

fitting a i2c ic to an adapter

I all,
I bough some i2c ics to use. On getting them I found they were tiny. So I bought some DIL adapters to use them on a breadboard. I can see "footprint" to drop them onto on the adapter. But how do I get then to stick on the adapter? Sorry I'm clueless on hardware
by knobby67
Thu May 12, 2016 1:11 pm
Forum: Automation, sensing and robotics
Topic: best electronics to drive a small bi polar stepper
Replies: 4
Views: 889

Re: best electronics to drive a small bi polar stepper

Thanks for the advise. Some of this is a little hard to work out :)
by knobby67
Thu May 12, 2016 7:44 am
Forum: Automation, sensing and robotics
Topic: best electronics to drive a small bi polar stepper
Replies: 4
Views: 889

best electronics to drive a small bi polar stepper

Hi All, I'm learning electronics via raspberry pi. At present I'm about to start on i2c. What I'm going to do is use a NXP stepper driver ( PCA9629 ) to run a group of small bipolar stepper motors ( 12v ). I've check the I2C chips documents and read how everything works. The hardware “driver” part h...
by knobby67
Tue Aug 18, 2015 2:46 pm
Forum: Automation, sensing and robotics
Topic: cell dongle to use with raspberry 2
Replies: 3
Views: 780

Re: cell dongle to use with raspberry 2

Hi yes that's the one, however I read yesterday that this script doesnt work any more, while someone else claimed one is auto detected. So I came here hoping to clear it up :)
by knobby67
Tue Aug 18, 2015 9:39 am
Forum: Automation, sensing and robotics
Topic: cell dongle to use with raspberry 2
Replies: 3
Views: 780

cell dongle to use with raspberry 2

Hi All, I'd need to use a raspberry 2 to capture data remotely. I thought the best way to do this would be to use a USB cell dongle ( I'm in UK ) with a dropbox script to send the data. I've looked up info on cell dongle data and there's quite a bit, however much of it seems for rap1 and for US netw...
by knobby67
Fri Apr 27, 2012 8:55 am
Forum: General discussion
Topic: Using openGL?
Replies: 89
Views: 15027

Re: Using openGL?

<t>As someone who is an opengl programmer my only real worry is running hi res with 256MB of ram, I think that will be a challenge when you start to use fairly complex models and textures.<br/> <br/> Can any one tell me who has a pi are people running opengl graphics on SDL or using something like o...
by knobby67
Mon Apr 23, 2012 5:00 pm
Forum: General discussion
Topic: Using openGL?
Replies: 89
Views: 15027

Re: Using openGL?

I've had SDL  running many times on ARMs with no x running.  I've never used opengl as none of them had the performance,  but I would assume it would run as SDL make the "screen/surface" for you.
by knobby67
Tue Apr 03, 2012 3:16 pm
Forum: General discussion
Topic: Development environments
Replies: 54
Views: 28704

Re: Development environments

<t>HeadCase said: <br/> <br/> <br/> What I am saying is that as a HW engineer, if I build a circuit and it draws 4Amps, I want to know where that current is going. I don't just think that every year circuits draw twice as much as last year and thats cool. Twice the current has to deliver results.<br...
by knobby67
Tue Apr 03, 2012 2:15 pm
Forum: General discussion
Topic: Development environments
Replies: 54
Views: 28704

Re: Development environments

<t>HeadCase said: <br/> <br/> <br/> Lets get this thread into perspective.<br/> <br/> I'm just having a dig at this whole 700Mhz is slow, 256Mb RAM is tiny idea. When I was at uni the formidable Professor Tom Parnell told us the definition of a good engineer was someone who could do for 1 Dollar wha...

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