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by pico
Sun Feb 15, 2015 5:06 am
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

Also, i've discovered that loading the peripheral modules for spi etc using the device tree is not equivalent to loading the old way... the drivers loaded using device tree seem to lead to some performance issues compared to the old drivers. Haven't investigated closely enough to figure out what is...
by pico
Tue Feb 10, 2015 2:56 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

Is there any trick like the above that will work on a model type rather than a serial number, for example? No. I'll think about it though. I was thinking that it might be relatively simple to modify the bootloader so that it conditionally processes lines from config.txt based on model type. Can you...
by pico
Sun Feb 08, 2015 2:59 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

That will underclock the Pi2 a little to 840MHz. OK. I thought I'd read it would just be ignored by the RPi2 if < 900. Suppose Pi1 has serial 0x11111111 and Pi2 has serial 0x22222222 then you can do: arm_freq=950 # applies to any board [0x11111111] arm_freq=840 # applies only to board with serial 0...
by pico
Sun Feb 08, 2015 1:25 am
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

You are correct, but Pi2 runs at a higher voltage by default which meant that force_turbo was incorrectly setting the "warranty" bit. That was unintended. So, what we've agreed to do is to no longer treat bit 24 of the board revision as the warranty warranty bit on Pi 2. The latest rpi-update will ...
by pico
Sat Feb 07, 2015 2:40 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

joan wrote:My understanding is that the final six hex digits have the following interpretation.

Code: Select all

/proc/cpuinfo revision field

SRRR MMMM PPPP TTTT TTTT VVVV

S scheme (0=old, 1=new)
[/quote]

Thanks for this -- very interesting.

So is the "scheme bit" above the warranty bit, or does it encode something else?
by pico
Sat Feb 07, 2015 2:37 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

From reading elsewhere on the forum, it appears that force_turbo=1 will set the warranty bit. Has that always been the case? Or did the criteria change somewhere along the line? Anyway, here's the config.txt: # uncomment to force a console size. By default it will be display's size minus # overscan....
by pico
Sat Feb 07, 2015 1:25 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

Has my warranty bit been set on RPi2?

rfx@raspberrypi ~/tmp $ cat /proc/cpuinfo |grep Rev
Revision : 1a21041
by pico
Sat Feb 07, 2015 8:59 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RPi2 GPIO PERI_BASE Dom Gert BCM2836
Replies: 22
Views: 6133

Re: RPi2 GPIO PERI_BASE Dom Gert BCM2836

I've been playing with the RPi2 for a couple of days, and I too found I had a problem with some programming that relied on the hardcoded GPIO_BASE value of 0x20200000. My workaround has been to call the affected program from within a shell script that queried /proc/iomem for the value from within a ...
by pico
Wed Feb 04, 2015 1:07 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

Katch wrote:RaspBMC is not supported on the RPi2 - you'll need to move on to Sam's OSMC project as he has stated he will not be updating RaspBMC again.
OK, thanks for the clarification.
by pico
Wed Feb 04, 2015 12:17 pm
Forum: General discussion
Topic: The Raspberry Pi 2 Q&A thread
Replies: 442
Views: 73490

Re: The Raspberry Pi 2 Q&A thread

So I was interested in trying out RaspBMC on the RPi 2 (just received it today.) I haven't had any luck getting the RaspBMC sd card that I had running on a B+ to boot, even after the apt-get upgrade steps described above. So I went back to NOOBS, (got the latest revision 1.3.12), but NOOBS said it w...
by pico
Fri Sep 13, 2013 10:18 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry and NRF24L01 transceiver device
Replies: 18
Views: 7554

Re: Raspberry and NRF24L01 transceiver device

The gateway connects to the Arduinos, and each Arduino is allocated a TCP/IP port connection, with a full duplex stream. So you can do what you like with each port connection... use it like a virtual USB serial connection to the Arduino if you want. And because it's a TCP/IP port, remote clients can...
by pico
Fri Sep 13, 2013 9:52 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry and NRF24L01 transceiver device
Replies: 18
Views: 7554

Re: Raspberry and NRF24L01 transceiver device

dauhee wrote:fantastic - does it support asynchronous communications?
You mean as in AJAX? If so, then yes, there is an demo AJAX webserver sketch under "Docs" "Example Programs" here.
by pico
Fri Sep 13, 2013 5:19 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry and NRF24L01 transceiver device
Replies: 18
Views: 7554

Re: Raspberry and NRF24L01 transceiver device

Embeddedcoolness.com is now selling a nRF24L01+ <--> TCP/IP gateway that is hosted using a Raspberry Pi, allowing you to get WiFi capability on Arduinos using nRF24 modules.
by pico
Fri Aug 16, 2013 10:44 am
Forum: Add-ons
Topic: NRF24L01 RF Transceiver
Replies: 243
Views: 114024

Re: NRF24L01 RF Transceiver

If you are interested in connecting Arduinos to a LAN or the Internet using nRF24L01+ and a Raspberry Pi, you might want to check out this site: http://embeddedcoolness.com
by pico
Mon Oct 08, 2012 3:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C clock stretching
Replies: 63
Views: 43509

Re: I2C clock stretching

What will be the minimum and maximum baud rates that can be selected by the new version of the driver?
by pico
Sun Sep 16, 2012 3:14 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C clock stretching
Replies: 63
Views: 43509

Re: I2C clock stretching

hi i2c fans, I'm not sure if I'm experiencing a sypmtom of the above clock stretching problem, or if my problem relates to something different entirely. I'm trying to comminucate with an atmega328p (Arduino clone) as an i2c slave. Everything is working using the latest i2c and i2c-dev drivers, excep...

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