Справочник Пользователя для National Instruments NI-VXI

Chapter 3      Software Overview

NI-VXI User Manual

3-20

© National Instruments Corporation

default handler provides examples of how to parse commands, respond
to queries, and generate protocol errors.

SetWSSEcmdHandler

 replaces the current 

WSSEcmd

 interrupt handler

with an alternate handler. While Word Serial operations are enabled,
the 

WSSEcmd

 interrupt handler is called whenever an Extended

Longword Serial command is received. A default handler,

DefaultWSSEcmdHandler

, is supplied in source code as an example,

and is automatically installed when 

InitVXIlibrary

 is called.

SetWSSLcmdHandler

 replaces the current 

WSSLcmd

 interrupt handler

with an alternate handler. While Word Serial operations are enabled,
the 

WSSLcmd

 interrupt handler is called whenever a Longword Serial

command is received. A default handler, 

DefaultWSSLcmdHandler

,

is supplied in source code as an example, and is automatically installed
when 

InitVXIlibrary

 initializes the NI-VXI software.

SetWSSrdHandler

 replaces the current 

WSSrd

 interrupt handler with

an alternate handler. When 

WSSrd

 reaches the specified count or an

END bit, or an error occurs, it calls the 

WSSrd

 interrupt handler with

the status of the call. A default handler, 

DefaultWSSrdHandler

, is

automatically installed when 

InitVXIlibrary

 is called. The default

handler puts the status and read count in a global variable and flags the
operation complete.

SetWSSwrtHandler

 replaces the current 

WSSwrt

 interrupt handler

with an alternate handler. When 

WSSwrt

 reaches the specified count or

an error occurs, it calls the 

WSSwrt

 interrupt handler with the status of

the call. The DOR bit will be cleared before WR is set on the last byte
of transfer. 

InitVXIlibrary

 automatically installs a default handler,

DefaultWSSwrtHandler

, when it initializes the NI-VXI software.

The default handler puts the status and read count in a global variable
and flags the operation complete.