Charles,
oops, yes, you are correct, 256KB, not MB. The current footprint of the
Squawk implementation being run on the Sun SPOT is 80KB RAM for the VM
and 380KB for the libraries. This seems to be reasonable given the
resources of the NXT.
Regards,
Simon.
Charles Manning wrote:
On Monday 23 January 2006 22:01, Simon Ritter wrote:
Brian,
although Lejos has been very successfully hosted by Sourceforge you may
wish to consider starting this as a project under java.net. There is a
robotics community under there which this would fit very well into.
On the point of what version of Java to port, there is some interesting
work from Sun Labs that I am hoping we can leverage. This is a project
called Squawk, which is a very small version of Java aimed specifically at
embedded systems. The majority of the code, including the GC, is written
in Java (even device drivers) to make it easy to port. If that's not
enough the platform that we've been using to demonstrate this is a thing
called a Sun SPOT (small programmable object technology - an acronym I'm
sure that was thought up after the name :-) ). This is an ARM7 based
device with 256MB RAM and 2MBit Flash. Although a little bigger than I
believe the new LEGO device, the requirements for Squawk easily fit in this
(I can't remember the exact numbers, but will dig them out).
I assume you mean 256kB of RAM.
The footprint on some of the small simgle-chip micros is pretty small
According to:
http://www.iro.umontreal.ca/~feeley/cours/ift6232/doc/pres2/jvm-for-very-small-devices.pdf
the squawk footprint is pretty tight.
I will talk to the Sun Labs people running this project to see what the
status of access to the code for Squawk is. I know we're working with
several universities to use this as a teaching platform, it may be possible
to get access to it for a Lejos (or whatever it's called) port.
Regards,
Simon.
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