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Agilent VISA User’s Guide
4
Programming via GPIB and VXI
Using High-Level Memory Functions
High-level memory functions allow you to access memory on the
interface through simple function calls. There is no need to map
memory to a window. Instead, when high-level memory functions are
used, memory mapping and direct register access are automatically
done.
The trade-off, however, is speed. High-level memory functions are
easier to use. However, since these functions encompass mapping of
memory space and direct register access, the associated overhead slows
program execution time. If speed is required, use the low-level memory
functions discussed in “Using Low-Level Memory Functions” on
page 94.
Programming the Registers
High-level memory functions include the
viIn
and
viOut
functions for
transferring 8-, 16-, or 32-bit values, as well as the
viMoveIn
and
viMoveOut
functions for transferring 8-, 16-, or 32-bit blocks of data
into or out of local memory. You can therefore program using 8-, 16-, or
32-bit transfers.
High-Level Memory Functions
This table summarizes the high-level memory functions.
Table 20
Summary of High-Level Memory Functions
Function
Description
viIn8
(
vi, space, offset, val8
)
;
Reads 8 bits of data from the specified
offset.
viIn16
(
vi, space, offset, val16
)
;
Reads 16 bits of data from the specified
offset.
viIn32
(
vi, space, offset, val32
)
;
Reads 32 bits of data from the specified
offset.
viOut8
(
vi, space, offset, val8
)
;
Writes 8 bits of data to the specified
offset.
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