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by rownyr
Sun May 12, 2013 11:12 am
Forum: Troubleshooting
Topic: No display when monitor is turned on after the Pi
Replies: 2
Views: 532

No display when monitor is turned on after the Pi

I have a weird problem. When I turn on my HDMI monitor before I turn on the Pi, everything works as expected. But, when I turn on the Pi first and then the monitor, I get no display. Monitor's OSD says there's no input - it displays "HDMI power saving mode" for a while and then goes to standby mode....
by rownyr
Fri May 03, 2013 6:29 pm
Forum: Troubleshooting
Topic: GPIO: Register Addressing
Replies: 20
Views: 8728

Re: GPIO: Register Addressing

FYI, I finally made Eclipse CDT to cross compile with libwiringPi. I was getting the same error (cannot find -lwiringPi). I found the solution here: http://www.crc64.com/rpi-wiringpi-ve-crosscompile-islemi-nasil-yapilir.html The problem lies in the file name of shared library. It should be named lib...
by rownyr
Wed Apr 03, 2013 1:03 am
Forum: OpenVG
Topic: Test demo of OpenVG
Replies: 0
Views: 2627

Test demo of OpenVG

It normally prints EGL and OpenVG information and runs the demo. With --print-configs option it prints all available EGL configs. Typical output: --- EGL version: 1.4 --- 7 EGL extension(s): EGL_KHR_lock_surface EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_texture_2D_image EGL_KHR_vg_parent_image EGL...
by rownyr
Wed Apr 03, 2013 12:14 am
Forum: Graphics programming
Topic: Graphic/Video Layers in Raspberry Pi
Replies: 4
Views: 2684

Re: Graphic/Video Layers in Raspberry Pi

jamesh wrote:OpenWFC is on its way (it's written and used at Broadcom on the VC4 on other projects), but for the moment dispmanx can be used. You can composite quite a few layers with it - not sure what the limit is, but more than most would ever need!
Will OpenWFD be supported?
by rownyr
Fri Mar 22, 2013 2:26 pm
Forum: Advanced users
Topic: Power loss friendly Pi
Replies: 11
Views: 2692

Re: Power loss friendly Pi

Thanks. You'll need a lot of super capacitors -- it's about fifteen seconds of Pi uptime per farad for a model B, and that's assuming the capacitor outputs constant voltage and current, which it doesn't. . it may be cheaper/more space saving to use something like a Tecknet (or similar) battery , an...
by rownyr
Thu Mar 21, 2013 6:18 pm
Forum: Advanced users
Topic: Power loss friendly Pi
Replies: 11
Views: 2692

Re: Power loss friendly Pi

Thanks for the circuit, it looks interesting, althought I'm also far from engineering level. I'm using this online calculator http://www.circuits.dk/calculator_capacitor_discharge.htm Currently I'm looking into using these caps: http://www.tme.eu/en/details/dre22_2.5/supercapacitors/samxon/# For 2 o...
by rownyr
Thu Mar 21, 2013 10:33 am
Forum: Advanced users
Topic: Power loss friendly Pi
Replies: 11
Views: 2692

Re: Power loss friendly Pi

Filesystem is always mounted as read-only (mounting options: ro, noload) and only reading is actually performed. Out of interest, have you achieved this, and if so is there any other configuration required than modifying the /etc/fstab options? I have a headless RaspPi to connect to the Sky+ box, a...
by rownyr
Wed Mar 20, 2013 11:29 pm
Forum: Advanced users
Topic: Power loss friendly Pi
Replies: 11
Views: 2692

Re: Power loss friendly Pi

Jim JKla wrote:That was an assumption not absolute fact. ;)
Please consider that as a fact. :)
Filesystem is always mounted as read-only (mounting options: ro, noload) and only reading is actually performed.
by rownyr
Wed Mar 20, 2013 9:42 pm
Forum: Advanced users
Topic: Power loss friendly Pi
Replies: 11
Views: 2692

Power loss friendly Pi

Hi, Assuming that my Pi (B rev.2) uses a read only filesystem.. is there a chance that Pi or SD card will get corrupted/broken after a power loss? I mean power loss at any time, even at start-up, boot-up, movie playing or during shutdown. Also, is it possible to corrupt SD card while only reading fr...
by rownyr
Mon Feb 04, 2013 10:22 pm
Forum: OpenMAX
Topic: Face detection
Replies: 2
Views: 1830

Re: Face detection

If you are worried about CPU time not being available while maxing out the Pi doing video, is using a second Pi just to process the face-rec an option for you? They are sooo cheap after all. I was thinking about this before, but 2nd Pi wouldn't help because CPU is too slow to do that. On the other ...
by rownyr
Mon Feb 04, 2013 9:38 pm
Forum: OpenMAX
Topic: Face detection
Replies: 2
Views: 1830

Face detection

On Pi, there's face detection OpenMAX camera port: http://home.nouwen.name/RaspberryPi/documentation/ilcomponents/prop.html#OMX_IndexConfigCommonFaceDetectionRegion Has anyone been able to use it? Or is there any other HW accelerated solution for face detection on Pi? I need to detect faces from cam...
by rownyr
Sun Feb 03, 2013 3:51 pm
Forum: Automation, sensing and robotics
Topic: Eye Tracking
Replies: 8
Views: 9597

Re: Eye Tracking

There is face tracking in the GPU (not sure of the licence so may not be available at first) Any chance of getting this available as an API? I need only face detection with faces marked with rectangles - nothing more, although full face tracking would be great! If license cost would be comparable t...
by rownyr
Sun Feb 03, 2013 12:32 pm
Forum: Automation, sensing and robotics
Topic: Eye Tracking
Replies: 8
Views: 9597

Re: Eye Tracking

There is face tracking in the GPU (not sure of the licence so may not be available at first) Any chance of getting this available as an API? I need only face detection with faces marked with rectangles - nothing more, although full face tracking would be great! If license cost would be comparable t...
by rownyr
Wed Jul 11, 2012 12:04 pm
Forum: General discussion
Topic: Lower temperature support
Replies: 19
Views: 3786

Re: Lower temperature support

Thank you for all suggestions. In which country? UK you should be OK with the standard device I would think - in a box there should be some heat build up to survive any UK winter. Unfortunately it's not UK, it's Poland, where -20°C is normal and I doubt the build up heat would last long. So, I have ...
by rownyr
Wed Jul 11, 2012 10:06 am
Forum: General discussion
Topic: Lower temperature support
Replies: 19
Views: 3786

Re: Lower temperature support

holmez wrote:Perhaps rownyr is considering the governments educational cost cutting.
LOL! Actually, I was thinking about using RPi in a CarPC in the winter :)
by rownyr
Wed Jul 11, 2012 1:39 am
Forum: General discussion
Topic: Lower temperature support
Replies: 19
Views: 3786

Lower temperature support

If possible, please include industrial LAN9512i chip instead of commercial LAN9512. The former has lower temperature support (-40°C to 85°C). The "AP" mentioned in FAQ has the same low temperature range so the whole board should be usable down to -40 Celsius.

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