Java Microcontrollers

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Can you get microcontrollers that are programmed with Java. All the
onesi have found are programmed in basic assembly or C .

 

[Jean-Yves]

Can you get microcontrollers that are programmed with Java. All the
onesi have found are programmed in basic assembly or C .

there used to be javamok but it seems they dont exist anymore...
replaced by basic picpro ?

 

[Wim Lewis]

Can you get microcontrollers that are programmed with Java. All the
onesi have found are programmed in basic assembly or C .

Yes, there are things like the Javelin Stamp, the JStamp (based on the aJile
chip), the DS-TINI, probably others ... I haven't used any of them.

You could presumably also use something like gcj to compile Java to the
native code of an AVR, or run a tiny JVM on a larger chip like an ARM.

I'm adding comp.arch.embedded to the newsgroups line, since this seems
like more down their alley.

 

[Andrew Reilly]

Yes, there are things like the Javelin Stamp, the JStamp (based on the
aJile chip), the DS-TINI, probably others ... I haven't used any of
them.

You could presumably also use something like gcj to compile Java to the
native code of an AVR, or run a tiny JVM on a larger chip like an ARM.

I'm adding comp.arch.embedded to the newsgroups line, since this seems
like more down their alley.

Any of the ARM variants that have "J" in the list of suffixes has some
java bytecode execution magic in them. I don't know how much extra you
need to actually make a JVM, and I don't know how much (if any) better
that is than a software JIT-based JVM. Hopefully someone who does will
comment.

Cheers,

 

[Jasen Betts]

Can you get microcontrollers that are programmed with Java. All the
onesi have found are programmed in basic assembly or C .

yes: arm7

Bye.
Jasen

 

[Jasen Betts]

Any of the ARM variants that have "J" in the list of suffixes has some
java bytecode execution magic in them. I don't know how much extra you
need to actually make a JVM, and I don't know how much (if any) better
that is than a software JIT-based JVM. Hopefully someone who does will
comment.

JIT is a bit hard to implement if you pick a micro with a harvard
architecture as usually they can't execute the ram...

Bye.
Jasen

 

[Andrew Reilly]

JIT is a bit hard to implement if you pick a micro with a harvard
architecture as usually they can't execute the ram...

Yes, but ARM isn't one of those. Or did you have some other point?

Cheers,

 

[Wilco Dijkstra]

ARM Cortex M3 actually is, unless the manufacturer adds extra RAM. Core RAM
is not accessible from program space.

No, Cortex-M3 can read data from flash and execute from SRAM. Like most
ARMs it is Harvard because it has separate instruction and data interfaces to
improve performance. However it does have a single unified address space
unlike pure Harvards.

In any case running a JIT compiler on a small micro controller is a bit
optimistic unless it is very simple.

Wilco

 

[Marcus Harnisch]

ARM Cortex M3 actually is, unless the manufacturer adds extra RAM. Core RAM
is not accessible from program space.

What is "Core RAM"? CM3 can execute code from any location but
peripheral space (PPB and device) and the NX region at the top.

Code execution is usually slightly quicker from the lower 512MB (code
region), which is normally used for Flash/ROM. Could also be RAM
though.

Regards
Marcus