Siemens XT65 - Manual (Page 28)

Java User’s Guide
4 Software Platform
35
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wm_java_usersguide_v12 Page 28 of 123 2008-02-25
Confidential / Released
4 Software Platform
In this chapter, we discuss the software architecture of the SMTK and the interfaces to it.
4.1 Software Architecture
The SMTK enables a customer to develop a Java application on a PC and have it be execut-
able on the Java enabled module. The application is then loaded onto the module. The platform
comprises:
•
Java TM Micro Edition (Java ME TM ), which forms the base of the architecture.
The Java ME TM is provided by SUN Microsystems, http://java.sun.com/javame/ . It is specif-
ically designed for embedded systems and has a small memory footprint. The ME uses:
CLDC 1.1 HI, the connected limited device configuration hot spot implementation.
IMP-NG, the information module profile 2
nd generation, this is for the most part identical to
MIDP 2.0 but without the lcdui package.
• Additional Java virtual machine interfaces:
AT Command API
File I/O API
The data flow through these interfaces is shown in
Figure 7 and Figure 29 .
• Memory space for Java programs:
Flash File System: around 1700k (1200k in XT75)
RAM: around 400k
Application code and data share the space in the flash file system and in RAM.
• Additional accessible periphery for Java applications
- A maximum of ten digital I/O pins usable, for example, as:
Output: status LEDs
- Input: Emergency Button
- One I2C/SPI Interface.
- One Digital Analog Converter and two Analog Digital Converters.
- Serial interface (RS-232 API): This standard serial interface could be used, for example,
with an external GPS device or a current meter.
For detailed information see
Section 4.2 .