Atmel AT91 - Manual (Page 58)

RTJ C
OMPUTING
P
TY
. L
TD
.
SimpleRTJ – J
AVA
V
IRTUAL
M
ACHINE
The simpleRTJ is a clean room imple-
mentation of the Java Virtual machine that
has been specially optimized to run on devices
with limited amount of memory and without
the support of any RTOS.
It has all the key features that are required
from any decent VM implementation including
multi-threading and garbage collection.
The simpleRTJ’s customisation options make
it ideal to run on a wide range of 8, 16 and
32 bit microcontrollers afit can be easily tailored
to suit the target system.
Performance
• Uses pre-linked Java application, which
significantly reduces the application startup
times as no dynamic class loading is required.
• Pre-linked classes allow VM to execute
bytecodes at full speed without any delays
that are otherwise required to resolve
constant pool symbolic references.
• Efficient memory and method frames allocation
schemes improve overall VM performance.
Debugging
The remote debugger is available for Java
source code debugging. Debugging can be
performed on the host PC (virtual debugging)
or directly on the target device via serial or
TCP communication drivers.
Possible applications
• Smart cards, smart card readers/writers.
• Electronic payment terminals.
• Factory automation.
• Robotic controllers.
• Small consumer devices - pagers, cellular
phones, etc.
• Electronic toys.
• Various embedded devices.
Requirements
• A host computer capable of running Java
and target processor development tools.
• ANSI C cross-compiler for the target
processor or microcontroller.
• JDK 1.2 (or higher) or similar Java IDE for
compiling Java applications and running
the ClassLinker.
• Additional tools for uploading binary
images into the target devices.
• Supports threads, exceptions,
interfaces, multi-dim arrays, soft
real-time support via javax.events
• Can operate as a mini JavaOS
• Three-color mark & sweep
garbage collection
• Java apps can be built for 64KB,
banked 64KB and 16MB memory
models
• Remote in-device debugging
C
ONTACTS
AUSTRALIA
RTJ Computing Pty. Ltd.
18 Hockin Street
Willagee WA 6156 - Australia
Phone: +61 403 947343
Fax: +61 8 6210 1103
e-mail: [email protected]
W
EB
S
ITE
www.rtjcom.com
VI-09
C H A P T E R V I - S O F T W A R E I P
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