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by dave j
Sun Mar 12, 2017 4:24 pm
Forum: General discussion
Topic: Using RPi to flash Arduino bootloader
Replies: 14
Views: 5832

Re: Using RPi to flash Arduino bootloader

Actually, I didn't want to use the IDE, it sort of gets in the way but it has the flash boot loader command. I typically have no idea what I am doing I just keep trying until something happens so I got slightly confused between what I thought I needed and what I actually needed. Right now without t...
by dave j
Sun Mar 12, 2017 10:23 am
Forum: General discussion
Topic: Using RPi to flash Arduino bootloader
Replies: 14
Views: 5832

Re: Using RPi to flash Arduino bootloader

If anyone does need to flash an Arduino bootloader you can find instructions at Using Raspberry Pi as an Arduino (AVR) programmer and from Adafruit at Program an AVR or Arduino Using Raspberry Pi GPIO . The current Raspbian version of avrdude seems to already have support for using GPIO pins so you ...
by dave j
Wed Feb 15, 2017 4:28 pm
Forum: General discussion
Topic: Pi Zero Max Purchase
Replies: 25
Views: 3875

Re: Pi Zero Max Purchase

If they didn't foresee any negative impact in removing or altering the limit, then they'd likely change it. But apparently they do, based on information to which we are not privy. People can raise all sorts of amateur theories as to why, but that's all they are, uninformed amateur theories. My unin...
by dave j
Sun Jan 22, 2017 11:29 pm
Forum: General discussion
Topic: Ideas for having museum visitors indicate where they live?
Replies: 20
Views: 3342

Re: Ideas for having museum visitors indicate where they liv

The biggest problem I see is uneven state/country sizes and boundaries making accurate detection of their selection difficult. Draw the different regions in different colours. When the user presses the screen you can use the input position to lookup the colour and hence tell which region they selec...
by dave j
Tue Jan 03, 2017 2:24 pm
Forum: General discussion
Topic: Using a Raspberry as a 6-bit to 6-bit +2bit FRC converter?
Replies: 4
Views: 877

Re: Using a Raspberry as a 6-bit to 6-bit +2bit FRC converte

You can get the Raspberry Pi to dither to it's HDMI output (see Is 8bit to 6bit dithering possible? ). It wouldn't be acting as a converter as you asked about but it might be suitable for what you want if you can get the Raspberry Pi generate the video - playing a movie for instance. As a start you ...
by dave j
Tue Dec 06, 2016 2:07 pm
Forum: General discussion
Topic: Running x86 apps on ARM
Replies: 92
Views: 114685

Re: Running x86 apps on ARM

What would make this x86 emulator better than the many many other dynamic recompiling x86 Emulators for the ARM CPU? Especially as most of the others are free and will generate the best code for the version of the ARM they are running on without requiring different versions of the emulator. How wil...
by dave j
Wed Oct 12, 2016 10:05 pm
Forum: Raspbian
Topic: Flash Player now available for Chromium
Replies: 98
Views: 51449

Re: Flash Player now available for Chromium

The rpi-chromium-mods package, in addition to adding Flash, installs uBlock origin and h264ify, customises some aspects of the appearance of the browser (such as use of the openbox window theme), selects DuckDuckGo as the default search engine and applies a few command-line flags which may slightly...
by dave j
Tue Sep 27, 2016 10:52 am
Forum: General discussion
Topic: Running windows on Raspberry Pi 3
Replies: 13
Views: 3344

Re: Running windows on Raspberry Pi 3

It looks like experimental support for your printer was added in version 5.2.12 of gutenprint (Linux printer drivers) . Unfortunately, Rasbian only has version version 5.2.10 at the moment - it will get updated at some point but I don't know when. You could grab the source code and build the driver ...
by dave j
Thu Feb 25, 2016 9:25 pm
Forum: C/C++
Topic: c sizeof error
Replies: 2
Views: 652

Re: c sizeof error

You need a comma separating the format string from the call to sizeof(). e.g.

printf("char: %i\n,", sizeof(c));

In your code it looks like you've put the comma inside the format string instead of after it.


dave j
by dave j
Wed Feb 10, 2016 7:35 pm
Forum: OpenGLES
Topic: OpenGL AND openGL ES with driver enabled ?
Replies: 6
Views: 4112

Re: OpenGL AND openGL ES with driver enabled ?

You should have listed the extensions. Is the GL_ARB_ES2_compatibility extension listed?

Unfortunately, all my Pi2s are busy doing other things at the moment so I can't have a play with the new driver yet.


David
by dave j
Mon Feb 01, 2016 4:31 pm
Forum: Gaming
Topic: STICKY: Emulation on the RPi: Updated 29/06/2017
Replies: 148
Views: 415897

Re: Emulation on the Raspberry Pi&Pi2 (Updated 24/01/2016)

Thanks fo the info! Is there anywhere that explains all this 3x integer etc - it seems a bit of a minefield to set it up. thanks again I'm not the best person to provide support on RetroArch - I've only picked bits up from forum posts. Forget the 3x bit, it's the integer scaling bit that's importan...
by dave j
Mon Feb 01, 2016 2:28 pm
Forum: Gaming
Topic: STICKY: Emulation on the RPi: Updated 29/06/2017
Replies: 148
Views: 415897

Re: Emulation on the Raspberry Pi&Pi2 (Updated 24/01/2016)

Any chance you could post the files here? Tried signing up to that forum and the image verification is broken so you can't actually sign up! You should be able to download it from the Retropie forum thread I also linked to without being signed up. Retropie also distribute it as part of their shader...
by dave j
Sat Jan 30, 2016 4:03 pm
Forum: Gaming
Topic: STICKY: Emulation on the RPi: Updated 29/06/2017
Replies: 148
Views: 415897

Re: Emulation on the Raspberry Pi&Pi2 (Updated 24/01/2016)

Just in case people haven't noticed it elsewhere: I've written a Pi friendly CRT shader for retroarch. It looks pretty good and runs at [email protected] on an suitably overclocked Pi (any version). Rather than repeat myself, here's some links to other forums: Info with screenshots on the libretro forum . ...
by dave j
Mon Jan 18, 2016 10:41 am
Forum: General discussion
Topic: Raspberry Pi Zero long term availability?
Replies: 80
Views: 14212

Re: Raspberry Pi Zero long term availability?

However, I do sympathise. :lol: I know exactly what it's like to be waiting for 'toys' in the mail. I pity any window-salesmen who knocks at the door when I'm expecting a package. :lol: I once waited in for a package when a delivery driver knocked on my door - only to ask if he could leave a packag...
by dave j
Mon Jan 04, 2016 5:24 pm
Forum: General discussion
Topic: Clocking a Pi B as if it's a Pi Zero
Replies: 7
Views: 2164

Re: Clocking a Pi B as if it's a Pi Zero

jbeale wrote:Could you? It's in stock somewhere?
Don't get your hopes up. ;)

I wanted the default settings so I can get on with testing on a model B rather than have to wait until I can get my hands on a Zero.
by dave j
Mon Jan 04, 2016 4:21 pm
Forum: General discussion
Topic: Clocking a Pi B as if it's a Pi Zero
Replies: 7
Views: 2164

Re: Clocking a Pi B as if it's a Pi Zero

Commenting out all overclocking options in config.txt, then rebooting: [email protected]:~ $ vcgencmd get_config int arm_freq=1000 core_freq=400 gpu_freq=300 sdram_freq=450 temp_limit=85 (I've deleted unrelated lines.) So no explicit overvoltage, but if you stress the CPU & run: [email protected]:~ $ vcgencmd me...
by dave j
Mon Jan 04, 2016 1:50 pm
Forum: General discussion
Topic: Clocking a Pi B as if it's a Pi Zero
Replies: 7
Views: 2164

Re: Clocking a Pi B as if it's a Pi Zero

In another post the following was stated as the default for the RPi0 arm_freq=1000 gpu_freq=300 core_freq=400 over_voltage=6 Thanks. Do you know what the SDRAM is clocked at? Most of the overclock settings in raspi-config run it that faster than 400MHz which makes me wonder what the Zero defaults to.
by dave j
Mon Jan 04, 2016 1:03 pm
Forum: General discussion
Topic: Clocking a Pi B as if it's a Pi Zero
Replies: 7
Views: 2164

Clocking a Pi B as if it's a Pi Zero

I'm updating my Pi friendly retroarch CRT shader and want to see how it would perform on a Pi Zero. I don't have a Zero to test on but can change the settings on my model B to match. I know the Zero runs the CPU at 1GHz but what about the other settings? (i.e. core, GPU, RAM, over voltage, etc.) Doe...
by dave j
Thu Nov 05, 2015 10:02 pm
Forum: Graphics programming
Topic: half float
Replies: 3
Views: 1597

Re: half float

Just checking, you are using GL_HALF_FLOAT_OES and not GL_HALF_FLOAT as the enum to glVertexAttribPointer aren't you. It has the _OES bit to identify it as part of an extension. There's no GLhalf datatype - just use uint16_t or define your own type with bitfields using something like: typedef struct...
by dave j
Mon Oct 12, 2015 9:28 am
Forum: Off topic discussion
Topic: Are you a Geek or a Nerd?
Replies: 13
Views: 1972

Re: Are you a Geek or a Nerd?

Obligatory XKCD reference.
by dave j
Sat Oct 10, 2015 5:12 pm
Forum: General discussion
Topic: The output on a 5" (12.5cm) B+W 12v TV
Replies: 1
Views: 413

Re: The output on a 5" (12.5cm) B+W 12v TV

Have you tried putting

Code: Select all

sdtv_disable_colourburst=1
into your config.txt file?

This will output a monochrome signal to the composite video out and may make the image a bit sharper.
by dave j
Mon Oct 05, 2015 8:22 am
Forum: Off topic discussion
Topic: Dolphin - A Wii Emulator
Replies: 13
Views: 41400

Re: Dolphin - A Wii Emulator

Do you think with raspberry pi B2, could be fair enough to emulate some game now? The CPU in the Wii reportedly runs at 729 Mhz. The one in the Pi 2 runs at 900 Mhz. Even allowing for a bit of overclocking of the Pi 2, it's very unlikely you'd be able to emulate the Wii's processor on the Pi fast e...
by dave j
Mon Oct 05, 2015 8:16 am
Forum: Off topic discussion
Topic: Would anyone like to add anything?
Replies: 3
Views: 815

Re: Would anyone like to add anything?

The internet is awash with info on the RPi and what it can do. Is there really a need to regurgitate any of it on that RS page? Well it does give the author a chance to provide a link to their web site and boost their search engine ranking. Presumably joining the Raspberry Pi forum just to post a l...
by dave j
Fri Sep 25, 2015 9:23 am
Forum: OpenGLES
Topic: Back buffer gets cleared?
Replies: 4
Views: 3166

Re: Back buffer gets cleared?

Tile based GPUs don't preserve the back buffer by default because it reduces performance. You can control it using EGL_SWAP_BEHAVIOUR (see here ). You should also read Performance Tuning for Tile Based Architectures which has a good explanation of why you should avoid it if possible and other perfor...
by dave j
Sat Sep 05, 2015 11:51 am
Forum: Graphics programming
Topic: Curvature/CRT-simulation on A+, possible?
Replies: 3
Views: 1910

Re: Curvature/CRT-simulation on A+, possible?

Sorry for bumping my own thread, but I would really really like to know if this is possible? Yes it's possible. The HLSL shaders you've seen do a lot more than just barrel distortion and whilst the Pi might have problems implementing the full range of effects it should be easily able to do the barr...

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