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by mikeyoung
Thu Oct 22, 2015 11:52 pm
Forum: OpenGLES
Topic: Cant render large bitmap
Replies: 3
Views: 2651

Re: Cant render large bitmap

Thank Paeryn for your answer. You are spot on with your diagnosis. By the time I got back to this message I had found the problem. I am frequently updating the texture. I do this by using "delete imageTexture" before creating a new texture with the latest image from my camera. I discovered that my v...
by mikeyoung
Thu Oct 22, 2015 12:46 am
Forum: OpenGLES
Topic: Cant render large bitmap
Replies: 3
Views: 2651

Cant render large bitmap

Hi I have a small test application written in Qt5.5 using the QOpenGLWidget. It simply loads in bitmap images and displays them as a texture. I'm completely new to all this and after a week of very very slow progress, I now have this working. I developed the code on a desktop Ubuntu machine and all ...
by mikeyoung
Tue Sep 22, 2015 9:05 am
Forum: General discussion
Topic: 22" Touch Screen monitor with Raspberry Pi 2
Replies: 3
Views: 1171

Re: 22" Touch Screen monitor with Raspberry Pi 2

nitesh wrote:Hi,
May I use DELL 2240T - 21.5" Touch Screen Monitor with my Raspberry Pi 2??

Please help.
I bought a Dell 2240 recently.
It worked fine on the RPi straight out of the box for me, but I'm not using multi touch so can't comment on that.
by mikeyoung
Tue Sep 22, 2015 8:46 am
Forum: Graphics programming
Topic: Lens Correction on RPi
Replies: 0
Views: 1115

Lens Correction on RPi

Hi Guys I have been working on a project which captures images from a remote camera via UDP. My application is written on the RPi in C++ Qt. Its all working fine but my image has lens distortion (pincushion distortion) from a close up lens that I use on the camera. My image is 1280x960 pixels and I ...
by mikeyoung
Tue Sep 22, 2015 8:06 am
Forum: General discussion
Topic: Robust Read Only RPi
Replies: 8
Views: 1809

Re: Robust Read Only RPi

Thanks for the replies Thanks Heater for the pointer to the document. I have not read it yet but will do. I am aware of the cached writes to disc. I did some tests writing a 3MB file to the flash drive and then instantly dismounting the drive. This took about 400 to 500 msec for the write and the di...
by mikeyoung
Wed Sep 16, 2015 9:58 pm
Forum: General discussion
Topic: Robust Read Only RPi
Replies: 8
Views: 1809

Re: Robust Read Only RPi

It is going to be tight. You also need to measure how long it takes to receive the signal. GPIO to receive the signal? It may work, but testing will be the ultimate judge. Hi kusti8 Thanks for the comment. I believe the Wiring Pi interrupt latency on the RPi is less than 100usec, probably more like...
by mikeyoung
Wed Sep 16, 2015 9:28 pm
Forum: General discussion
Topic: Robust Read Only RPi
Replies: 8
Views: 1809

Robust Read Only RPi

Hi guys I'm using my RPi V2 for an industrial application, where the device will undoubtedly be powered off at the main power socket without proper shutdown. I plan to mount the Raspian Operating System on the SDCard as Read Only. This is sufficient for my dedicated application. I do however have so...
by mikeyoung
Fri Jul 03, 2015 4:32 am
Forum: Graphics programming
Topic: YUV422 to RGB conversion
Replies: 13
Views: 10466

Re: YUV422 to RGB conversion

Hi Guys Its been a while since I last posted to this topic, but here I am, kindly asking for some help again. I'm writing an application for the RPi using Qt5.2. I have a byte array containing a YUV4:2:2 image. The image is 768x576 pixels in size and simple stored in the array as a linear set of pix...
by mikeyoung
Thu Nov 13, 2014 5:22 am
Forum: Compute Module
Topic: RPiCM HDMI ESD Protection
Replies: 12
Views: 4076

Re: RPiCM HDMI ESD Protection

Hi Gorden

Thanks for clearing up the issue with the CEC signal. Now I know its for signal isolation it makes sense.

Regards
Mike
by mikeyoung
Thu Nov 13, 2014 4:33 am
Forum: Compute Module
Topic: Compute Module Ethernet MAC Address
Replies: 10
Views: 5323

Re: Compute Module Ethernet MAC Address

Thanks for your reply Gordon

Regards
Mike
by mikeyoung
Tue Nov 11, 2014 11:42 pm
Forum: Compute Module
Topic: Design info for adding Ethernet to CM
Replies: 23
Views: 9935

Re: Design info for adding Ethernet to CM

Hi seulater The LAN9514 is really quite an independent device. It simply requires an upstream USB connection. In its simplest form it would connect to the Compute Module via 2 usb signals, ie USB_DP and USB_DM on pins 165 and 167. Other than that the Reset signal, is the only other concern. It can b...
by mikeyoung
Mon Nov 10, 2014 11:34 pm
Forum: Compute Module
Topic: PLC IOBoard
Replies: 3
Views: 1566

Re: PLC IOBoard

Hi drb_oliver I saw the same in the data sheet as you quoted, and have done the same and added a serial EEPROM, just incase. But then comes the added issue of programming the EEPROM device. I'd rather not have to program before assembly, and not sure if the linux driver will allow eeprom programming...
by mikeyoung
Mon Nov 10, 2014 11:10 pm
Forum: Compute Module
Topic: RPiCM HDMI ESD Protection
Replies: 12
Views: 4076

Re: RPiCM HDMI ESD Protection

Hi drb_oliver I'm pleased I could help. I actually think that the CM IO board design is incorrect. First of all, the HDMI_SDA and HDMI_SCL signals are pulled up to 5v via the ESD5384. That means that the Broardcom chip is exposed to 5v on these inputs. I do not have the spec to check if the inputs a...
by mikeyoung
Mon Nov 10, 2014 9:46 am
Forum: Compute Module
Topic: RPiCM HDMI ESD Protection
Replies: 12
Views: 4076

Re: RPiCM HDMI ESD Protection

Hi drb_oliver Please please please forgive me if I am wrong, but I took a look at the HDMI static protection circuit you have linked to and I think it is incorrect. I am using a similar device to the CM2020, in my case a TPD12S521. The devices uses mosfets as level shifters on the 4 control lines, C...
by mikeyoung
Sun Nov 09, 2014 9:35 am
Forum: Compute Module
Topic: PLC IOBoard
Replies: 3
Views: 1566

Re: PLC IOBoard

Hi drb_oliver Took a look at your user manual. Looks like a great project. I'm just laying out a compute module base board for myself which will also have Ethernet using LAN9514 in my case. I see that you have not used the optional EEPROM with your LAN9512. How do you plan to assign an individual MA...
by mikeyoung
Sat Nov 08, 2014 2:19 am
Forum: Compute Module
Topic: Compute Module Ethernet MAC Address
Replies: 10
Views: 5323

Compute Module Ethernet MAC Address

Hi I'm currently designing a base board for the compute module. I need 2 x USB and 2 x Ethernet ports. I have decided to use a LAN9514 which will provide 4 USB ports plus a single Ethernet port. I will then use an additional LAN9500 usb to Ethernet chip on one of the USB ports to provide my second E...
by mikeyoung
Sun Oct 19, 2014 9:35 am
Forum: Graphics programming
Topic: YUV422 to RGB conversion
Replies: 13
Views: 10466

Re: YUV422 to RGB conversion

Hi James Thanks for your comments once again. i really appreciate you taking the time. I've just come across this blog - http://robotblogging.blogspot.com.au/2013/10/gpu-accelerated-camera-processing-on.html Its clear that the Pi can cope with the YUV to RGB conversion I need at a speed far greater ...
by mikeyoung
Sun Oct 19, 2014 5:46 am
Forum: Graphics programming
Topic: YUV422 to RGB conversion
Replies: 13
Views: 10466

Re: YUV422 to RGB conversion

Thanks for all your comments I have used the 5 lookup table like james suggested in the past on an FPGA implementation. I would probably have done something like that on the Pi if I wrote production code. I was just using the floats and multiplications because it was quick to test just to get a feel...
by mikeyoung
Sat Oct 18, 2014 5:39 am
Forum: Graphics programming
Topic: YUV422 to RGB conversion
Replies: 13
Views: 10466

YUV422 to RGB conversion

Hi I've been working on a board that captures data from a camera in YUV422 format and transmits the image over ethernet as UDP packets. I'm planning on using a Raspberry pi at the receiving end. I've already done some experiments transferring images from a PC to the Pi (with very grateful help from ...
by mikeyoung
Fri Jul 18, 2014 12:23 am
Forum: Beginners
Topic: Power Interruption on Raspberry pi
Replies: 10
Views: 1802

Re: Power Interruption on Raspberry pi

Thanks RaTTus

That will be a good start for me.
by mikeyoung
Thu Jul 17, 2014 9:20 am
Forum: Beginners
Topic: Power Interruption on Raspberry pi
Replies: 10
Views: 1802

Re: Power Interruption on Raspberry pi

Hi RaTTus Thanks for your comments. I actually don't need any storage at all. Just to reliably boot, and run a single application. Actually, as an aside, I do have some storage, but I've created an small circuit with FRAM non volatile memory for that. That FRAM board is accessed via Serial comms and...
by mikeyoung
Thu Jul 17, 2014 7:12 am
Forum: Beginners
Topic: Power Interruption on Raspberry pi
Replies: 10
Views: 1802

Re: Power Interruption on Raspberry pi

Hi cpc464 Fixing up the system with fsck is really not an option for me. I'm actually planning to used the RPi Compute model, which has embedded Flash, but I guess the problem will still be the same there, ie the regular OS writes to disc. I've seen snippets of information about 'Read Only' setups. ...
by mikeyoung
Tue Jul 15, 2014 1:47 pm
Forum: Beginners
Topic: Power Interruption on Raspberry pi
Replies: 10
Views: 1802

Re: Power Interruption on Raspberry pi

Hi Thanks for your answers. What is actually being written to the SD cards? My application does not have any need to write to the SD card. Even if the operating system just booted into the command shell, does it still write to the SD card? The application I have in mind is an industrial application,...
by mikeyoung
Tue Jul 15, 2014 3:42 am
Forum: Beginners
Topic: Power Interruption on Raspberry pi
Replies: 10
Views: 1802

Power Interruption on Raspberry pi

Hi All As a complete newbie to RPi and Linux i find myself asking loads of questions. Here goes another .... I know in windows systems there are numerous background writes to the hard drive and pulling power at the wrong time can break the file system and kill the PC. Does Linux / RPi do the same? I...
by mikeyoung
Thu Jul 10, 2014 2:48 am
Forum: Graphics programming
Topic: UDP Image Transfer
Replies: 12
Views: 5114

Re: UDP Image Transfer

Hi hjimbens Thanks a bunch. I got the image transfer going this morning. The colours are mixed up Red and Blue swapped but thats no problem. I can fix that. I guess that maybe the Linux and Windows RGB are different ordered. The reconstructed image on the RPi builds up from bottom to top and the ref...

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