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Chapter 3      Software Overview

© National Instruments Corporation

3-19

NI-VXI User Manual

GetWSSEcmdHandler

 returns the address of the current 

WSSEcmd

interrupt handler function. While Word Serial operations are enabled,
the 

WSSEcmd

 interrupt handler will be called every time an Extended

Longword Serial command is received.

GetWSSLcmdHandler

 returns the address of the current 

WSSLcmd

interrupt handler function. While Word Serial operations are enabled,
the 

WSSLcmd

 interrupt handler is called whenever a Longword Serial

command is received.

GetWSSrdHandler

 returns the address of the current 

WSSrd

 interrupt

handler function. 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.

GetWSSwrtHandler

 returns the address of the current 

WSSwrt

interrupt handler function. When 

WSSwrt

 reaches the specified count

or an error occurs, it calls the 

WSSwrt

 interrupt handler with the status

of the call.

When the Word Serial Read Protocol Error query is received,

RespProtError

 places the saved error response in the Data Low

register, sets the saved error response to ffffh (no error), unasserts
ERR*, and sets RR. If no previous error is pending, the value ffffh
(no error) is returned.

SetWSScmdHandler

 replaces the current 

WSScmd

 interrupt handler

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

WSScmd

 interrupt handler is called whenever a Word Serial

command is received (other than BAV if a 

WSSrd

 call is pending,

or BREQ if a 

WSSwrt

 call is pending). A default handler,

DefaultWSScmdHandler

, is supplied in source code as an example,

and is automatically installed when 

InitVXIlibrary

 is called. The