National Instruments NI-VXI

Chapter 3 Software Overview

GetWSSEcmdHandler ()

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 ()

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 ()

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 ()

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.

RespProtError ()

When the Word Serial Read Protocol Error query is received,

RespProtError places the saved error response in the Data Low

ERR*, and sets RR. If no previous error is pending, the value ffffh

(no error) is returned.

SetWSScmdHandler (func)

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