Java Microcontrollers

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,

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

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

Cheers,

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

Mit freundlichen Grüßen

Frank-Christian Krügel

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

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