Siemens XT65 User Manual

4.4 Handling Interfaces and Data Service Resources

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wm_java_usersguide_v12

Page 33 of 123

2008-02-25

Confidential / Released

To develop Java applications the developer must know which resources, data services and
hardware access are available. 
•

There are multiple AT parsers available 

•

There is hardware access over
- two serial interfaces: ASC1 and ASC0 (both fully accessible).
- general purpose I/O. To configure the hardware access, please refer to 

 and 

. 

- I2C/SPI
- All restrictions of combinations are described in 

•

A Java application has: 
- instances of the AT command class, one with CSD and the others without, each of which

would, in turn, be attached to one of the AT parsers.

- two instances of access to a serial interface, ASC0 and ASC1, through the CommCon-

nection API. Access to the control lines of these interfaces through CommConnection-
ControlLines (TC65 only).

- System.out over any serial interface or into the file system

The module can exist in the following six states in relation to a Java application, the serial inter-
faces, GPIO and I2C/SPI. See 

 for information about the AT commands referenced. A state

transition diagram is shown in 

This section shows how Java applications must share AT parsers, GPIO pins and I2C/SPI
resources. DAC, ADC and DAI are not discussed here.
Color legend for the following figures:

This is the default state. The Java application is inactive and there is an AT interface with CSD
on ASC0 as well as ASC1. The initial state of the pins is according to [4].

Figure 8:  Module State 1