Raspberry Pi Forums

AndrewS

Something like this - please excuse the crude cardboard mock up ;) Nothing wrong with cardboard cases ;) https://sites.google.com/site/bifferboard/Home/photos/ghetto-case Black box on the left is mock Ras-Pi and has the same dims as one (Not yet had mine delivered, 2 weeks to go) Did you make allow...

AndrewS

Gert van Loo wrote:For really high speed use a DSI to CSI connection: 1.2Gbps

I thought on the RPi the DSI and CSI interfaces were entirely GPU-side, i.e. not usable by anyone outside Broadcom?

AndrewS

See also the discussions in this thread http://www.raspberrypi.org/phpBB3/viewt ... =63&t=6068

AndrewS

This should still leave room for a small 2-3" screen when drivers are available for the DSI connection, or perhaps a small screen that uses the RCA/Composite video out signal. This would be the ultimate retro hack http://hackaday.com/2010/11/10/diving-deep-into-the-game-boy-lcd-protocol/ :twisted: ...

AndrewS

I don't have my own RPi yet, so I can't be 100% certain these are "correct", but they seem to work okay for the versions of start.elf I've downloaded from the firmware repository . A while ago I wrote a Python script to pull the "version" out of a start.elf file http://www.raspberrypi.org/archives/1...

AndrewS

On the "Board Index" page, using the "Raspite theme", the only way to tell if a sub-forum has any unread posts, is to mouse-hover over the forum link, and the tooltip either says "Unread posts" or "No unread posts". It would be nice if there was an icon or something so you could tell at-a-glance whi...

AndrewS

Without wanting to go too off-topic, you may also find this interesting https://sites.google.com/site/bifferboa ... estigation

AndrewS

Might be a power problem? Try plugging all your USB peripherals into a powered USB hub...
Might not fix the problem, but can't hurt to try

AndrewS

Brilliant, I think we have a winner!

I wouldn't even begin to know what to do with a RAW file.

I'm a programmer, not a graphic designer.

AndrewS

With the one-Pi-per-customer limit still in effect, I guess the only way to build a bramble right now would be to buy up a bunch of Raspis from ebay, making it a very expensive cluster

AndrewS

by the way, the GPIO port probably won't provide enough bandwidth, to do this, so using ethernet is a better choice. Actually, the SPI bus (available on the GPIO connector) is potentially higher-banwidth than Ethernet :) https://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus Some ethernet ch...

AndrewS

I can see it may have uses as part of an application platform but it seems largely redundant and unnecessary extra cost in pursuing the goal of teaching computing to kids. In including DSI and CSI the R-Pi looked to be hardware more designed towards a tablet / phone wannabe than for education. Thou...

AndrewS

AllegroMan wrote:What is the limiting factor here; is it hardware level, or can optimisations be made at the OS level to speed up SD card I/O?

Possibly both?

There's a bunch of links to other relevant forum threads here http://www.raspberrypi.org/phpBB3/viewt ... 342#p80342

AndrewS

I wonder if KeithSloan's having fun using https://en.wikipedia.org/wiki/Network_e ... dow_System ?

AndrewS

rasbeer wrote:But it looks like speed could be a real issue for some applications on the existing RasPi

Or an opportunity for clever optimisations

AndrewS

The wikipedia article explains why

It's probably a mixture of legacy, and the fact that i2c devices are also used by super-low-power devices which don't have "integers" that your high-level languages have.

You'd probably benefit from adding bcd2int() and int2bcd() macros to your code

AndrewS

Your power-management SoC comment might be the answer. It kind of flies in the face of logic that when something is "off" it uses more power than when it's "on" :lol: (But it's not really off because no switch). Who knows. (outside Broadcom ;) ) Maybe this is something that could be fixed by a futu...

AndrewS

The unfused "power input" available via the GPIO headers is only 5V, not the 3.3V generated by RG2 or the 2.5V generated by RG3 or the 1.8V generated from RG1 :geek: And for truly low-power situations, you'd probably want to avoid add-ons like the Gertboard as they might draw their own power too! Ed...

AndrewS

As an aside, I noticed yesterday that the current consumption goes up slightly when the Pi is shut down. Happened again. It's reproducible. Anyone know why that is? Possibly all the write buffers getting flushed to disk? (where in this case "disk" is the SD card). And/or the power-management featur...

AndrewS

Just noticed that selsinork's pictures are of a "1208" Pi, and alexeames' pictures are of a "1213" Pi http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=5889 So I may include both of them in my GIMP file, to make "spot the difference" between revisions easier ;) Does anyone know if the Pis now b...

AndrewS

LOL, it's not "weird DS1337 format", it's Binary-Coded Decimal (BCD) http://en.wikipedia.org/wiki/Binary-coded_decimal

AndrewS

AFAIK these "wrong size images" are only on forum posts that were on Simple:Press and then got imported into the new forums. I believe any images added to new forum posts do display with the correct aspect ratio. I'd classify it as a bug in Eben's forum-import script

AndrewS

Now that the forums are separate from Wordpress, logging into the forums no longer logs you into wordpress (the main site) at the same time. You can "log in" to the main site via http://www.raspberrypi.org/wp-login/ to stop the comment system asking you to copy'n'paste passwords. Maybe there should ...

AndrewS

The real benefit and one not discussed is allowing for the RTC to wake-on-alarm. Even that is not such a big deal on the raspberrypi since it draws minimal power so it could just remain on all the time. AFAIK there's no 'sleep mode' available on the Raspberry Pi? Hence no wake-on-alarm functionalit...

AndrewS

selsinork: I'm afraid those suffer from the same "glare" I'm trying to avoid

I'll let this "photo battle" play out, and see what you two come up with between yourselves

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