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Burngate
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Re: Break out board (GPIO, SPI, I2C, and UART)

Wed Dec 14, 2011 5:38 pm

Quote from Gert van Loo on December 14, 2011, 17:09
Uh no, I use SPI as I find I2C too slow. Boards have come back expect pictures soon.
Can you ask for the pictures to be put on the front page?

Bacan
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Re: Break out board (GPIO, SPI, I2C, and UART)

Wed Dec 14, 2011 6:20 pm

Quote from Burngate on December 14, 2011, 17:38
Can you ask for the pictures to be put on the front page?

Being that they are Bare Boards, they should be on page 4 or something like that.

Isn't that where the London papers put the bare photos?

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meltwater
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Re: Break out board (GPIO, SPI, I2C, and UART)

Wed Dec 14, 2011 8:02 pm

Page 3, we can see their raspberries and everything...

I thought it meant populated boards, which boards are these then? Loosing track at what stage the pre-production is at.

Edit: Ok, perhaps I mis-understood, without their Pie-Cases. Fingers crosses for testing now.
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Shifty
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Re: Break out board (GPIO, SPI, I2C, and UART)

Wed Dec 14, 2011 10:16 pm

Nice project! Great idea and something the RaspPi definitely needs!

Maybe bring out V+ and GND to the breakout board too? Might make a nice point to hook up servos or sensors to.

I2C for NXT sensors would be awesome but that is because I already own the NXT and the sensors =D ($50+ a sensor is kind of expensive though, they do have a nice range of robot sensors though Lego and Non-Lego)

I'm not a Linux Kernel Driver guy either =(, but once you have that done I would love to learn how to expose and program an API for that. Maybe I'll even check out how to make a Linux Kernel Driver for ya

Good Luck,
Shifty

problemchild
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Re: Break out board (GPIO, SPI, I2C, and UART)

Wed Dec 14, 2011 10:39 pm

For the likes of I2C and talking to NXT sensors it looks like they use 3.3V I2c so really in many ways all you need is a connector and a couple of resistors.

Looks like a lot of work as already been done actually driving certain sensors in Linux
http://www.rjmcnamara.com/2011.....x-anxtcam/

All very interesting ;)

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Gert van Loo
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Re: Break out board (GPIO, SPI, I2C, and UART)

Wed Dec 14, 2011 10:43 pm

Can you ask for the pictures to be put on the front page?
I did, I gave Eben a bare PCB and a fully populated board (but untested) .
You must forgive Liz and Eben for not having had time for posting pictures as it is a very busy time getting the board produced.

joep
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Re: Break out board (GPIO, SPI, I2C, and UART)

Thu Dec 15, 2011 2:02 pm

Gert:

I'd like to turn an RPi into a multifunction piece of test equipment (scope/frequency counter/signal analyzer/etc.) for schools to teach electronics (with interface and display software on another device --- pad, phone, etc). Do you think the hardware on your board will accommodate that use?

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liz
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Re: Break out board (GPIO, SPI, I2C, and UART)

Thu Dec 15, 2011 2:04 pm

I'm actually just editing them now - Gert, ready yourself for a barrage of questions from the comments section!
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Hugh Reynolds
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Re: Break out board (GPIO, SPI, I2C, and UART)

Thu Dec 15, 2011 2:11 pm

Bated breath...

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Gert van Loo
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Re: Break out board (GPIO, SPI, I2C, and UART)

Thu Dec 15, 2011 2:26 pm

This board is intended for education. When I made it I was thinking of the first stages:
1/ Write code to set an output pin high or low, Read an input pin.
2/ Driver a motor and use end-switches connected to the inputs.
3/ Drive the motor use PWM.
4/ Use a Gray-coded opto-disk for position/speed feedback.
5/ Use SPI to talk to a PIC
(The PIC gives students access to a totality different programming world: The micro controller with limited memory and processing power where you have to do EVERYTHING yourself.)
With the Pi and the Pic connected, things can get rapidly complex: Debug programs on two different processors which are talking to each other. Etc. Etc.
Your analyzer could be done using the PIC doing AD conversion and low-level real-time grunt work and the Raspberry-Pi doing high level data processing.

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liz
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Re: Break out board (GPIO, SPI, I2C, and UART)

Thu Dec 15, 2011 2:26 pm

On the front page now. I think poor Gert's afternoon is now going to be entirely taken up answering questions about it.
Director of Communications, Raspberry Pi

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meltwater
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Re: Break out board (GPIO, SPI, I2C, and UART)

Thu Dec 15, 2011 4:03 pm

Could Gert start an official thread for the board (else these 19 pages will swell somewhat)?

In fact could probably do with an accessory section of the forum for all those extra modules you mention...

It is a rather nice looking board though, as boards go, only a fully kitted out R-Pi could top that!

Oh...it's already getting some love!
http://www.geek.com/articles/c.....-20111215/
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csoutreach
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Re: Break out board (GPIO, SPI, I2C, and UART)

Fri Dec 16, 2011 5:04 pm

Forgive me if I've missed it somewhere, but a number of articles talk about the need for someone to write the linux drivers for SPI etc. -- are the details of the SPI control registers published anywhere, or is it covered by broadcom's NDA? I've posted our work in progress of an SPI breakout board for schools elsewhere, but it seems pointless if it's going to be a battle for us to create the appropriate drivers for it.
http://piface.openlx.org.uk/ Raspberry Pi IO Interface Board

lyzby
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Re: Break out board (GPIO, SPI, I2C, and UART)

Fri Dec 16, 2011 6:21 pm

>I've posted our work in progress of an SPI breakout board for schools elsewhere
Like where, if you would?

But I'd agree--a little more information about the status (current or anticipated upon release) of drivers or kernel enabling for i2c, spi, gpio, etc. would be helpful.

bradburts
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Re: Break out board (GPIO, SPI, I2C, and UART)

Fri Dec 16, 2011 7:14 pm

The story was that GPIO, SPI etc would be available at launch.
If it doesn't work at launch then something went wrong, the aim will be to provide of course.
I expect they Liz and the elves will all be a little busy right now packing our little stockings.....

I would bet that those interested should research spidev http://www.kernel.org/doc/Docu.....spi/spidev

What's your SPI development board all about, do you have links?

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