Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 69)

8E. Microsoft C II. SOFTWARE GUIDES - 8. Driver488/DRV
II-54 Personal488 User’s Manual, Rev. 3.0
Use of the Character Command Language
In order to simplify programming Driver488/DRV with C, the following files are provided on the
Driver488/DRV program disk:
•
IEEEIO.C: Communications routines for Driver488/DRV
•
IEEEIO.H: Header file, contains declarations from IEEEIO.C
•
IEEEDEMO.C: Example file showing use of fputs and fgets with Driver488/DRV (included
with Microsoft C only)
•
CRITERR.ASM: Critical error handler assembly language source file (included with Microsoft C
and Turbo C only)
•
CRITERR.OBJ: Object file produced from CRITERR.ASM (included with Microsoft C and Turbo
C only)
•
CRITERR.H: Header file, contains declarations for using CRITERR.ASM
The actual demonstration program is contained in 195DEMO.C .
All files for Microsoft C are in the \MSC directory.
To execute the demonstration program, the files must be compiled and then linked. The following
DOS commands perform these steps:
C> msc 195demo;
C> msc ieeeio;
C> link 195demo ieeeio;
Finally, the demonstration program is run by typing 195DEMO <Enter> . Notice that the critical error
handler CRITERR.ASM is not required for the demonstration program. Its use is described later in
“CRITERR.ASM (Microsoft C & Turbo C),” one of the last topics in this Sub-Chapter.
The above command assumes that you have Microsoft C and that the files have been copied into the
appropriate directory for use with your C compiler. Notice that the program uses a small data model
because it uses less than 64K of code and data.
Initialization of the System
Any program using Driver488/DRV must first establish communications with the Driver488/DRV
software driver. In C, this is accomplished using the
OPEN statement. Communication both to and
from Driver488/DRV is required. Thus, the file must be opened for both reading and writing ( RDWR ).
8E. Microsoft C
Topics
•
Use of the Character Command Language ............................... II-53
•
Initialization of the System .......................................................... II-53
•
Configuration of the 195 DMM .................................................... II-56
•
Taking Readings ............................................................................. II-56
•
Buffer Transfers.............................................................................. II-56
•
Interrupt Handling ........................................................................ II-57
•
IEEEIO.C .......................................................................................... II-59
•
CRITERR.ASM (Microsoft C & Turbo C) ................................... II-61
•
Sample Program ............................................................................. II-62