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by Mrkva
Sat Jul 07, 2012 12:39 am
Forum: Graphics, sound and multimedia
Topic: 8x8x8 LED cube
Replies: 6
Views: 39344

Re: 8x8x8 LED cube

Yeah, latching registers are usually better - you can easily achieve almost 1/8 (12%) duty cycle. I have achieved with RPi without any latching ~75%/8 (9%) DTC and even had to decrease it a little bit - it was just too bright.
by Mrkva
Tue Jul 03, 2012 1:03 pm
Forum: Graphics, sound and multimedia
Topic: 8x8x8 LED cube
Replies: 6
Views: 39344

8x8x8 LED cube

Hey, I've successfully built RasPi controlled 8x8x8 LED cube. Currently, I'm doing everything - generatingeffects and LED multiplexing RasPi, which is not ideal: Linux is not a real time OS and even with highest process priority there are various glitches, flashes etc. when something interrupts the ...
by Mrkva
Tue Jun 19, 2012 4:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO and interrupts from kernelspace
Replies: 7
Views: 11501

Re: GPIO and interrupts from kernelspace

Hello, standard GPIO functions *should* work. Howewer, there is no support for GPIO driven interrupt in official kernel. I've written a quick and dirty patch that should make it work (at least exporting GPIO, setting interrupts using /sys/class/gpio/gpioN/edge and polling /sys/class/gpio/gpioN/value...
by Mrkva
Tue Jun 05, 2012 2:35 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Support for GPIO-driven interrupts
Replies: 47
Views: 82547

Support for GPIO-driven interrupts

Hey kids! since official kernel is still missing support for GPIO-driven interrupts (a feature I really *need*), I've decided to wire a quick and dirty one :) http://dev.mrkva.eu/rpi/linux-gpio-irq.patch - patch for current kernel from https://github.com/raspberrypi/linux.git (commit 94fbbc4e3988075...
by Mrkva
Fri Mar 16, 2012 9:32 pm
Forum: General discussion
Topic: Post your estimated arrival dates
Replies: 323
Views: 51980

Re: Post your estimated arrival dates

order placed 5.3.2012, est. delivery 14.5.2012. cz.farnell.com

lojza: zdravím kolegu z .cz

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