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by jamesh
Tue Dec 12, 2017 9:56 am
Forum: General programming discussion
Topic: Pi beginner
Replies: 3
Views: 48

Re: Pi beginner

I'd forget using Windows development environment- use Linux, much easier. But, to go back to first principles, there are a number of packages already available that may do what you want - specifically designed for museums and presentation systems. PiPresent, Kweb comes to mind. Google will find them...
by jamesh
Mon Dec 11, 2017 9:33 pm
Forum: General discussion
Topic: Still only one rpi zero per purchase?
Replies: 27
Views: 815

Re: Still only one rpi zero per purchase?

Going to close this thread soon. Run its course.
by jamesh
Mon Dec 11, 2017 9:32 pm
Forum: General discussion
Topic: Still only one rpi zero per purchase?
Replies: 27
Views: 815

Re: Still only one rpi zero per purchase?

The issue, as I see it, is you've got the Raspberry Pi foundation saying you can only buy one per person and at the same time, on the forums here, official representatives are encouraging people to buy more than one. Make up your minds. Either enforce this silly rule or pull it out. Right now it fe...
by jamesh
Mon Dec 11, 2017 5:34 pm
Forum: General discussion
Topic: use pi zero w in commercial production
Replies: 38
Views: 4326

Re: use pi zero w in commercial production

What a bizarre situation! Why don't they simply raise the price by say £1 - £2 and churn them out by the thousands? This would give them a decent profit margin and the extra cost would make little difference to the one-off hobbyist type user. Continuity of supply? Simply don't change it, if it does...
by jamesh
Mon Dec 11, 2017 12:56 pm
Forum: General discussion
Topic: Still only one rpi zero per purchase?
Replies: 27
Views: 815

Re: Still only one rpi zero per purchase?

The PiZero is quite a unique device Yup! Sales levels have surprised us. RPi have been very reluctant to publicly state that it is the equivalent of an experiment/promo/loss-leader but in reality, that is what it is. The lack of clarity has not gone down well with some people whereas others think t...
by jamesh
Mon Dec 11, 2017 12:05 pm
Forum: Troubleshooting
Topic: Raspberry Pi builtin WiFi keeps crashing
Replies: 28
Views: 1087

Re: Raspberry Pi builtin WiFi keeps crashing

For those wishing to try the debug firmware, please PM me and I will send it to you, see link for how to use it. https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=196018#p1244026 As for progress from Cypress, we have attracted their attention, and they are asking for more debug results from th...
by jamesh
Mon Dec 11, 2017 9:47 am
Forum: C/C++
Topic: [SOLVED] Writing a codec driver
Replies: 33
Views: 1091

Re: Writing a codec driver

PhilE wrote:
Sun Dec 10, 2017 10:17 pm
In this case the "exception" is a warning detected within an interrupt (rather than a fault exception), triggered by an underrun or overrun (XRUN) within ALSA.
Ah, thanks Phil.
by jamesh
Sun Dec 10, 2017 10:07 pm
Forum: C/C++
Topic: [SOLVED] Writing a codec driver
Replies: 33
Views: 1091

Re: Writing a codec driver

That kernel dump shows an exception - which is usually a bad thing. You should be able to track it down from the stack dump, and perhaps some more logging.
by jamesh
Sun Dec 10, 2017 9:54 pm
Forum: General discussion
Topic: Still only one rpi zero per purchase?
Replies: 27
Views: 815

Re: Still only one rpi zero per purchase?

Hi I'm a bit confused, but why on earth is it only possible to purchase a single Raspberry Pi Zero? I need a few of these for a project I'm working with, and without it, I'll need to get some chinese rubbish instead, which obviously works, but isn't nearly as god. roy Please see the linked threads,...
by jamesh
Sun Dec 10, 2017 5:12 pm
Forum: Beginners
Topic: Best command to shut Rpi down
Replies: 8
Views: 211

Re: Best command to shut Rpi down

I use sudo halt
by jamesh
Sun Dec 10, 2017 5:10 pm
Forum: Raspbian
Topic: Raspbian life cycle
Replies: 83
Views: 5948

Re: Raspbian life cycle

Debian and hence Raspbian comes to us with love for free. To expect their creators to support old versions for years on end would be ungrateful and greedy. But, you see, that's exactly the problem. People are aware that when you get something for free, it is worth about what you pay for it. Now, do...
by jamesh
Sun Dec 10, 2017 4:59 pm
Forum: Beginners
Topic: Screen Rotation
Replies: 8
Views: 5210

Re: Screen Rotation

Al the detail here. https://www.raspberrypi.org/documentation/configuration/config-txt/video.md This page will be updated soon to add some extra display rotate commands which will enable you to independently rotate the HDMI and the LCD, which makes it easier when switching between the two. display_h...
by jamesh
Sat Dec 09, 2017 7:35 pm
Forum: Beginners
Topic: Pi as just a processign device with data output
Replies: 6
Views: 207

Re: Pi as just a processign device with data output

Cool. In which case, use Raspbian, disable boot to desktop (in raspi-config), google for how to start stuff on startup. Also need to auto login, think that is also in raspi-config but not sure. Write a script that monitors a particular program to see if it is running, and reboot if not. Might alread...
by jamesh
Sat Dec 09, 2017 7:29 pm
Forum: Camera board
Topic: Optical Zoom
Replies: 2
Views: 123

Re: Optical Zoom

Not seen a compact one for the PI, they are actually pretty rare things, even in phones. Those you can get I suspect are quite expensive.
by jamesh
Sat Dec 09, 2017 1:28 pm
Forum: Camera board
Topic: h264 and the lag
Replies: 6
Views: 187

Re: h264 and the lag

Can you post a link to these C files? You don't run the .c files directly, they need to be compiled.
by jamesh
Sat Dec 09, 2017 1:24 pm
Forum: Graphics programming
Topic: run the HDMI and TFT screen simultaneously
Replies: 5
Views: 186

Re: run the HDMI and TFT screen simultaneously

From https://community.nxp.com/thread/462751 Victor Linnik Employee Oct 24, 2017 11:59 PM You can use fbset utility to manage framebuffers. Have a great day, Victor This may also help. http://www.tldp.org/HOWTO/pdf/Framebuffer-HOWTO.pdf The issue is that the underlying boot code enables a framebuff...
by jamesh
Sat Dec 09, 2017 1:22 pm
Forum: Beginners
Topic: Pi as just a processign device with data output
Replies: 6
Views: 207

Re: Pi as just a processign device with data output

That's probably OK, getting dataof the USB, but you then need to decode the format, produce your numerical numbers, then send them out. So you need to determine exaclty what sort of load you are going to put the CPU under to see if its possible.

I suspect it is, but you ought to run some numbers.
by jamesh
Sat Dec 09, 2017 11:10 am
Forum: Camera board
Topic: h264 and the lag
Replies: 6
Views: 187

Re: h264 and the lag

running test_launch.c doesn't look right at all.
by jamesh
Sat Dec 09, 2017 11:09 am
Forum: Beginners
Topic: Pi as just a processign device with data output
Replies: 6
Views: 207

Re: Pi as just a processign device with data output

The problem is going to be geting that sort of framerate over the USB.

What resolution are you using and what data format?
by jamesh
Sat Dec 09, 2017 11:06 am
Forum: Graphics programming
Topic: run the HDMI and TFT screen simultaneously
Replies: 5
Views: 186

Re: run the HDMI and TFT screen simultaneously

AFAIK, its one or the other. But I cannot remember why. I'll take a look on Monday since I have been dabbling in this area for other reasons.
by jamesh
Sat Dec 09, 2017 9:12 am
Forum: Camera board
Topic: h264 and the lag
Replies: 6
Views: 187

Re: h264 and the lag

H264 should be fine, it's quicker than mjpeg as its lower bandwidth. So its a setup problem I suspect.

I presume you are attempting to stream from Pi camera over Ethernet to some playback device?
by jamesh
Fri Dec 08, 2017 11:42 pm
Forum: Compute Module
Topic: [SOLVED] CM3 working with only one camera, two detected
Replies: 12
Views: 264

Re: CM3 working with only one camera, two detected

6by9 wrote:
Fri Dec 08, 2017 4:29 pm
Minor correction to James.
I2C is used to both crypto and sensor, but the sensor I2C goes through a level shifter to 1V8 which is likely to shift the acceptable high and low voltages to it, but by the sounds of it even those are behaving erratically.
ooh, I did not know that!
by jamesh
Fri Dec 08, 2017 4:21 pm
Forum: Compute Module
Topic: [SOLVED] CM3 working with only one camera, two detected
Replies: 12
Views: 264

Re: CM3 working with only one camera, two detected

So is the I2C on the camera interface just for the crypto chip? Is that why bypassing it fixed the problem? I will definitely add those pullup resistors in my next revision, and bodge some on for now to see if it helps. No, the camera commands are sent via I2C. i.e. setup, start, stop. The camera a...
by jamesh
Fri Dec 08, 2017 3:48 pm
Forum: General discussion
Topic: Should I move to Ubuntu
Replies: 10
Views: 423

Re: Should I move to Ubuntu

And use apt-get update and apt-get upgrade to keep up to date. That will work, but note that the newer, shorter commands apt update and apt upgrade may be better optimised for interactive use, while the longer form is optimised for script use. My guess is that the performance of the two versions wi...
by jamesh
Fri Dec 08, 2017 2:52 pm
Forum: General discussion
Topic: Should I move to Ubuntu
Replies: 10
Views: 423

Re: Should I move to Ubuntu

Obviously, the two posts so far in this thread are talking about different things (as is usually the case around here). That said, and "for what it is is worth", the issue OP raises is that while IN THEORY, you can just keep upgrading - i.e., if you have Wheezy, you can painlessly upgrade that to J...

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