Integrator's Manual GR47/GR48

9. EMBEDDED APPLICATIONS

LZT 123 7589 R1A

9. Embedded Applications

The radio device has the capability to store and run customer written code

in the form of a script during the processor’s idle time, through the use of

an on board interpreter.

9.1 Features

Main features of embedded applications are as follows.

• C based scripting language (Sony Ericsson specific);

• Over the air upgrade of scripts (NOT GSM software);

• Library of intrinsic functions;

• 2 scripts can be stored in the memory at any time but only 1 can be

active.

9.2 Implementation

The radio device has up to 44k of space available for storage of two scripts

in the scripting language and 25k of operating RAM. Structures included

in this language are:

• If - then - else statements

• While loops

• For loops

All hardware interfaces that are normally available to the radio device

through the AT commands are available to the embedded application.

Further drivers have been written such as M bus, keypad, SPI and I

C for

use by the embedded application (EA) through the use of the I/O pins.

9.2.1 Limitations

Since the radio device is processing the script using its own memory,

limitations are placed onto the scripts that are run.

• A direct comparison cannot be made to a fully compiled C program in

terms of size but a gauge of script size is that if each line were 128

characters long in the script then the script could be 350 lines long.

• Processing power is something that needs to be considered as the script

is run as a low priority process within the software. However, controller

mode stops GSM operation and provides all the processing power for

the script to be run. See the M2mpower Application Guide for more

details.

• Code cannot be ported directly from an existing application and loaded

directly onto the radio device. It must be re written in the Sony

Ericsson Mobile script language so that the radio device interpreter can

function correctly.