-have your cake and eat it too! "rasberry pi"
- M4MazakUser
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16 Aug 2011 01:36 - 16 Aug 2011 02:13 #12513
by M4MazakUser
-have your cake and eat it too! "rasberry pi" was created by M4MazakUser
anyone rekon one of these would run emc2?
www.raspberrypi.org/
they do have some digital outputs etc on board as standard,
@...............$25................WOW!
Roughly 16 lines of GPIO, plus I2C and SPI, all at 3.3V
www.raspberrypi.org/
they do have some digital outputs etc on board as standard,
@...............$25................WOW!
Roughly 16 lines of GPIO, plus I2C and SPI, all at 3.3V
Last edit: 16 Aug 2011 02:13 by M4MazakUser. Reason: i/o details
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16 Aug 2011 02:08 #12514
by jmelson
Replied by jmelson on topic Re:-have your cake and eat it too!
M4MazakUser wrote:
he could develop an RTAI port in a reasonable time for the TI OMAP chip on it.
Well, a year later, he has gotten a partial port up to a Linux kernel from about 2008.
Not a great result. So, does this Raspberry run a kernel that has and RTAI patch?
I assume not. But, recently, there has been some work on getting EMC2 to run with
a preemp-RT kernel, which should be a lot easier to come by.
Anyway, the OMAP chip on the BeagleBoard has another quirk, the GPIO functions
are multiplexed, so although the CPU runs at 700 MHz, the GPIO is only updated at
4 MHz, creating a bit of a bottleneck. I don't know if all ARMs work this way, but
there are at least rumors that some don't. Otherwise, one might be able to use
one of the serial interfaces that might go a bit faster. However, 8 bits * 4 MHz =
32 mbit/second, so IIC won't really give any boost.
Jon
A year ago I sent a $149 BeagleBoard to the ARM maintainer of the RTAI project, hopinganyone rekon one of these would run emc2?
www.raspberrypi.org/
they do have some digital outputs etc on board as standard,
@...............$25................WOW!
he could develop an RTAI port in a reasonable time for the TI OMAP chip on it.
Well, a year later, he has gotten a partial port up to a Linux kernel from about 2008.
Not a great result. So, does this Raspberry run a kernel that has and RTAI patch?
I assume not. But, recently, there has been some work on getting EMC2 to run with
a preemp-RT kernel, which should be a lot easier to come by.
Anyway, the OMAP chip on the BeagleBoard has another quirk, the GPIO functions
are multiplexed, so although the CPU runs at 700 MHz, the GPIO is only updated at
4 MHz, creating a bit of a bottleneck. I don't know if all ARMs work this way, but
there are at least rumors that some don't. Otherwise, one might be able to use
one of the serial interfaces that might go a bit faster. However, 8 bits * 4 MHz =
32 mbit/second, so IIC won't really give any boost.
Jon
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16 Aug 2011 02:22 #12515
by PCW
Replied by PCW on topic Re:-have your cake and eat it too! "rasberry pi"
"anyone rekon one of these would run emc2?"
'run' would be a somewhat optimistic term with only 128M of shared RAM
and 700 MHz integer only processor (no hardware floating point)
'run' would be a somewhat optimistic term with only 128M of shared RAM
and 700 MHz integer only processor (no hardware floating point)
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16 Aug 2011 03:27 #12516
by jmelson
Replied by jmelson on topic Re:-have your cake and eat it too!
PCW wrote:
hardware FP. It also costs quite a bit more.
Jon
Oh, that would be a killer! The BeagleBoard has 256M memory (I think) and"anyone rekon one of these would run emc2?"
'run' would be a somewhat optimistic term with only 128M of shared RAM
and 700 MHz integer only processor (no hardware floating point)
hardware FP. It also costs quite a bit more.
Jon
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16 Aug 2011 05:05 #12519
by M4MazakUser
Replied by M4MazakUser on topic Re:-have your cake and eat it too!
ACTUALLY, there is a 256mb model @$35
Following the example of the BBC Micro, we intend to launch both a Model A device (lacking the LAN9512, and with 128MB of RAM) at the $25 price point, and a Model B device (including the LAN9512, and with 256MB of RAM) for a $5-10 additional cost. We remain confident of shipping before the end of 2011.
Following the example of the BBC Micro, we intend to launch both a Model A device (lacking the LAN9512, and with 128MB of RAM) at the $25 price point, and a Model B device (including the LAN9512, and with 256MB of RAM) for a $5-10 additional cost. We remain confident of shipping before the end of 2011.
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29 Aug 2011 03:00 #12805
by M4MazakUser
Replied by M4MazakUser on topic Re:-have your cake and eat it too!
btw - just read this.....
It uses an ARM VFP floating point unit (an option when you build an ARM1176).
? does this make it more viable?
It uses an ARM VFP floating point unit (an option when you build an ARM1176).
? does this make it more viable?
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