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by Yam
Tue May 17, 2016 6:27 am
Forum: Raspberry Pi OS
Topic: Jessie dhcpcd.conf
Replies: 7
Views: 5612

Re: Jessie dhcpcd.conf

Thank you this is what I was looking for i'll have a play and see if I can get it working for my needs.
by Yam
Mon May 16, 2016 7:32 pm
Forum: Raspberry Pi OS
Topic: Jessie dhcpcd.conf
Replies: 7
Views: 5612

Jessie dhcpcd.conf

Hello, I am trying to setup a very particular network for 2 raspberry pi's One 'main' pi with WiFi connected to a second pi via a crossover cable (using the ethernet port on each pi). With NO switch just directly connected. I can not get the main pi when connected via the crossover cable to use the ...
by Yam
Tue Jan 26, 2016 10:43 pm
Forum: OpenMAX
Topic: OMX camera WITHOUT tunneling
Replies: 1
Views: 2128

OMX camera WITHOUT tunneling

Hello I am still desperately trying to create a stereo camera using 2 raspberry pis (yes i know there is a new board that can run 2 cameras but I've decided to complete this project as an exercise). I am so very close to getting a working program but I am unable to get the camera to behave without u...
by Yam
Mon Sep 07, 2015 9:19 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

So I have found a lot more looking into OpenMAX finding also that nearly all of it also applies to MMAL. I am getting to the point where I will be able to write my own programs. I can see why people avoid OpenMAX it is the pain everyone promised :). But things are slowly making sense and I have fewe...
by Yam
Mon Sep 07, 2015 9:12 pm
Forum: C/C++
Topic: C Libraries for Adafruit servo HAT?
Replies: 9
Views: 2236

Re: C Libraries for Adafruit servo HAT?

I don't know if this is what your looking for but I found this on my travels
https://github.com/raspberrypi/hats
by Yam
Sat Aug 15, 2015 2:57 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

Well after weeks of just stumbling around in the dark I have learnt a lot but I am still unable to get the most basic of examples working in MMAL. With so little documentation I've decided to try a stab at learning OpenMax. Thanks to jamesh who pointed me in the right direction in terms pthreads I r...
by Yam
Sat Aug 15, 2015 8:12 am
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

so i can compile the examples in the mmal test folder but still haveing problems. the connections example is the most usefull to me but the reader component fails at runtime when trying to set uri. it gives the error mmal: reader_container_open: error opening file filename (1) failed to set uri of c...
by Yam
Fri Aug 07, 2015 7:11 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

Ok buried in the userland code I have found what I was looking for.
going to try and compile it.

Is it just me? does anyone else struggle with this I feel I have bitten off more than I can chew tackling this library at this stage of my learning.
by Yam
Thu Aug 06, 2015 7:49 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

having learnt about pthreads semaphores and all the other gaps in my knowledge I am still struggling with MMAL (although I understand more of it).

In particular I am trying to make a compilable version of their example code.
Has anyone done this?
by Yam
Mon Jul 27, 2015 1:41 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

So I've finally gotten around to learning pthreads Its spinning my head a bit but slowly working my way through it. Threading works pretty much as I expected although more work is done by the programmer than I imagined. Still not the reached the point where I can implement my own blocking code. I th...
by Yam
Tue Jul 21, 2015 9:53 am
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

So I am getting further each day and now have my own working example displaying a preview thanks mainly to the raspicam programs and the example i posted before (which works great but does not terminate). I understand many of the concepts I was struggling with before but now I am looking for documen...
by Yam
Sun Jul 19, 2015 4:25 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

I have of course googled semaphores and read what I could understand. From the little i do understand it basically is some kind of event signal to tell you when a thread has finished. But standard programming technique? its odd how all the references I find in google are under advanced techniques. I...
by Yam
Sat Jul 18, 2015 6:10 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

thanks for the replies I am slowly getting to grips with this although the concept of a semaphore still eludes me and acording to the docs im supposed to have one to deal with buffers? anyway in the example on http://www.jvcref.com/files/PI/documentation/html/ is there a typo on the example code the...
by Yam
Wed Jul 15, 2015 4:40 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

Still struggling but have found a piece of example code that is far easier to read than the examples given in userland

https://github.com/tasanakorn/rpi-mmal- ... lop/main.c

note: do not compile currently investigating problem
by Yam
Mon Jul 13, 2015 4:52 pm
Forum: C/C++
Topic: #error header must be compiled as C++
Replies: 5
Views: 4404

Re: #error header must be compiled as C++

Yup legal C code is legal C++ code (except some very rare exceptions)
you don't need to learn anything new just write in C and compile with a C++ compiler.

Probably wise to make a note of it in a comment if its a public project.
by Yam
Mon Jul 13, 2015 4:02 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

Ok what i'm trying to do is create a stereo camera from 2 raspberry pi's connected via ethernet and 2 camera modules. I have found issue with the way the default behavior for the preview works. Idealy I would like 2 low res previews on the same screen (which wont necessarily be on fb0 because I woul...
by Yam
Sun Jul 12, 2015 8:29 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

Is there not 1 book on any of these subjects?
by Yam
Fri Jul 10, 2015 12:59 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

Does anyone know of any good articles or books what I really need is a more experienced programmer to point me in the right direction.
by Yam
Thu Jul 09, 2015 1:27 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Re: Recommended reading for MMAL

I have read all of this it does not explain the core concepts i.e what a buffer is and what it does
by Yam
Thu Jul 09, 2015 1:06 pm
Forum: C/C++
Topic: Recommended reading for MMAL
Replies: 30
Views: 5615

Recommended reading for MMAL

I have recently learnt to program in C and am struggling to understand MMAL I have worked through C a modern approach completely and can follow code. I feel that I am not familiar with a lot of the concepts used like ports streams and buffers. Can anyone recommend some good reading for these concepts?
by Yam
Fri Apr 05, 2013 6:42 pm
Forum: Graphics programming
Topic: OpenGL ES 3.0
Replies: 14
Views: 13504

Re: OpenGL ES 3.0

the way open GL works any new function not in the hardware would have to be emulated by the processor. As good as the raspberry pi is this would result in performance not worth the effort of writing the emulation. March of progress I'm afraid but I imagine there will be a raspberry pi 2 at some poin...
by Yam
Wed Feb 06, 2013 5:01 pm
Forum: Other projects
Topic: Educational Dance Game
Replies: 17
Views: 3019

Re: Educational Dance Game

This project has been on pause recently (moving, life etc). But I am due to start working on it again next week. I need a vote. The graphics are 2d and will have to remain so for the forseable future but there are 2 ways of doing the graphics 1. Pre rendered 3d sprites in blender. 2. 2d hand drawn a...
by Yam
Fri Oct 05, 2012 3:45 pm
Forum: Graphics, sound and multimedia
Topic: Mission: Make rPi audio better
Replies: 6
Views: 4176

Re: Mission: Make rPi audio better

I'm pretty sure my comments are quite ignorant as I don't know how to write a sound driver but. Surely a buffer in the ram is the best solution for audio it might raise latency but anything is better than the current solution (making the buffer 0 when nothing is needed to be played but still outputt...
by Yam
Wed Sep 26, 2012 3:27 pm
Forum: Gaming
Topic: using the raspberry pi and the Oculus Rift
Replies: 28
Views: 12794

Re: using the raspberry pi and the Oculus Rift

Just ordered the development kit may make more sense to try and power this with 3 raspberry pis 1 for computation and 1 for rendering the screen for each eye, optimising the memory divides you could get some fairly impressive worlds. You will be able to get something to the oculus with 1 raspberry I...
by Yam
Thu Sep 20, 2012 1:32 pm
Forum: Gaming
Topic: SNES with audio, anyone?
Replies: 7
Views: 4094

Re: SNES with audio, anyone?

Out of interest have you tried both modes in bsnes? "Accuracy uses a pixel-based renderer, which is required to properly emulates effects such as the plane shadow from Air Strike Patrol. However, it is almost twice as slow as the compatibility profile. Compatibility uses a scanline-based render...

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