National Instruments GPIB-PC User Manual
Page 136
Section Four A
BASICA/QuickBASIC GPIB-PC Function Calls
©National Instruments Corp.
4A-61
GPIB-PC User Manual
Unlike
IBRDA
,
IBRDIA
stores the data directly into an
integer array. No integer conversion is needed on the data
that has been read for arithmetic operations to be performed
on it.
NOTE: Do not pass dynamic arrays to the asynchronous
functions
IBRDIA
and
IBWRTIA
, since the QuickBASIC
environment might move them around in memory during an
I/O operation.
Refer to the
IBRDA
function and to the BASICA and
QuickBASIC GPIB-PC I/O Functions at beginning of this
section.
Device Example:
1.
Read 56 bytes of data into the integer array
RD%
from the
device TAPE% while performing other processing.
100 REM Perform device read.
110 CNT% = 56
120 REM
Array
size
is
equal
to
CNT%
divided
130 REM by 2.
140 DIM RD% (28)
150 CALL IBRDIA (TAPE%,RD%(0),CNT%)
160 MASK% = &H4100
' TIMO CMPL
170 REM Perform other processing here then
180 REM wait for I/O completion or a
190 REM timeout.
200 CALL IBWAIT (TAPE%,MASK%)
210 REM Check IBSTA% to see how the read
220 REM terminated on: CMPL, END, TIMO, or
230 REM ERR.
240 REM If CMPL or ERR is not set,
250 REM continue processing.
260 IF (IBSTA% AND &H8100) = 0 GOTO 160
270 REM Data is stored in RD%
280 REM All unaddressing has been done.
QuickBASIC Version 2.0 or 3.0,
replace line 150 with:
150 CALL IBRDIA (TAPE%,VARPTR(RD%(0)),CNT%)