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C
3
H A P T E R
Terminal Specific Function Library
There are a number of terminal specific library routines to facilitate the development of the
user's application. These functions cover a wide variety of tasks, including
communications, show string or bitmap on the LCD, buzzer control, scanning, file
manipulation, etc. They are categorized and described in this chapter by their functions or
the resources they work on.
The function prototypes of the library routines, as well as the declaration of the system
variables, can be found in the library header file (lib_ops.h or lib_opr.h). It is assumed that
the programmer has prior knowledge of the C language.
In This Chapter
3.1 System ......................................................................... 20
3.2 Barcode Reader............................................................ 40
3.3 Keyboard Wedge Interface .......................................... 60
3.4 Buzzer .......................................................................... 67
3.5 Real-time Clock........................................................... 70
3.6 LED ............................................................................. 73
3.7 Keypad......................................................................... 74
3.8 LCD ............................................................................. 80
3.9 Fonts ............................................................................ 96
3.10 Battery ....................................................................... 101
3.11 Communication Ports ................................................ 103
3.12 Wireless Communications ......................................... 114
3.13 Wireless Practice ....................................................... 180
3.14 File Manipulation....................................................... 186
3.15 Memory ..................................................................... 213
3.16 Miscellaneous ............................................................ 217
19
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