National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — GPCTR_Config_Buffer

NI-DAQ FRM for PC Compatibles

2-210

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 National Instruments Corporation

You need to use this function to use a general-purpose counter for buffered operation. You 
should call this function after calling the 

GPCTR_Set_Application

 function. 

NI-DAQ transfers counted values into the buffer assigned by this function when you are 
performing a buffered counter operation.

If you are using the general-purpose counter for 

ND_BUFFERED_PERIOD_MSR

, 

ND_BUFFERED_SEMI_PERIOD_MSR

, or 

ND_BUFFERED_PULSE_WIDTH_MSR

, or 

ND_BUFFERED_TWO_SIGNAL_EDGE_SEPARATION_MSR

, you should wait for the operation 

to be completed before accessing the buffer. 

For the 6602 and 455X devices, you can use

 GPCTR_Change_Parameter

 with 

paramID =

ND_BUFFER_MODE

 

to select continuous buffered operations (

ND_DOUBLE

) or 

single-buffered operations (

ND_SINGLE

). In continuous buffered operation mode you can 

use

GPCTR_Read_Buffer

 to access parts of the buffer while the operation is in progress.