National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — DIG_DB_Transfer

NI-DAQ FRM for PC Compatibles

2-162

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 National Instruments Corporation

For an input operation, 

DIG_DB_Transfer

 waits until NI-DAQ can transfer half the 

data from the buffer being used for double-buffered digital block input to another buffer, 
which NI-DAQ passes to the function. For an output operation, 

DIG_DB_Transfer

 waits 

until NI-DAQ can transfer the data from the buffer passed to the function to the buffer being 
used for double-buffered digital block output. You can execute 

DIG_DB_Transfer

 

repeatedly to read or write sequential half buffers of data.

group is the group to be configured.

Range:

1 or 2.

halfBuffer is the integer array to which or from which NI-DAQ is to transfer the data. The 
size of the array must be at least half the size of the circular buffer being used for the 
double-buffered digital block operation. 

ptsTfr is only used for output groups with partial transfers enabled. If you have set the partial 
transfer flag, NI-DAQ can make a transfer to the digital output buffer of less than or equal 
to half the buffer size, as specified by this field. However, the function will halt the 
double-buffered digital operation when NI-DAQ makes a transfer of less than half the buffer 

i16

assigned by configuration utility

i16

group

u32

points to transfer

[i16]

array to which or from which the data is to be 
transferred