5.2Programming Guide

5.2.1Naming Convention

The functions of the PCIDAQ PCI cards' software driver use full-names to represent a function's real meaning. The naming convention rules are:

In DOS Environment:

_{hardware_model}_{action_name}. e.g. _DIO48H_Initial().

All functions in the PCIDIO 48H driver are used by the board as {hardware_model}. But they can be used by PCIDIO 48H and PCIDIO 24H.

In order to recognize the difference between the DOS library and Windows 95 library, a capital "W" is put on the head of each function name of the Windows 95 DLL driver. e.g. W_DIO48H_Initial().

5.2.2 Data Types

We defined some data type in DIO48H.h (DOS) and Acl_pci.h (Windows

95). These data types are used by the PCIDAQ Card library. We suggest you to use these data types in your application programs. The following table shows the data type names and their range.

Type Name

Description

Range

U8

8-bit ASCII character

0 to 255

I16

16-bit signed integer

-32768 to 32767

U16

16-bit unsigned integer

0 to 65535

I32

32-bit signed integer

-2147483648 to 2147483647

U32

32-bit single-precision

0 to 4294967295

 

floating-point

 

F32

32-bit single-precision

-3.402823E38 to 3.402823E38

 

floating-point

 

 

 

 

F64

64-bit double-precision

-1.797683134862315E308 to

 

floating-point

1.797683134862315E309

Boolean

Boolean logic value

TRUE, FALSE

C/C++ Libraries ∙ 31