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Chapter 2 Function Reference — WFM_Load
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National Instruments Corporation 2-433 NI-DAQ FRM for PC Compatibles
changing the jumpers on the device, you must call AO_Configure to set the software copies
of the settings prior to calling
WFM_Group_Control (operation = START). You can make
repeated calls to
WFM_Load to change the shape of a waveform in progress, except on E Series
devices and SCXI DAQ modules used with remote SCXI; if you make repeated calls using
these devices, this function will return a transferInProgError. You also must use the
parameter values for numChans and chanVect used in the call to
WFM_Load prior to starting
the waveform when making calls to
WFM_Load while a waveform is in progress.
(AT-MIO-16F-5 only) If your buffer has been aligned by a previous call to
Align_DMA_Buffer, WFM_Load automatically indexes into the buffer to the new starting
point of the data. If you call
WFM_Load with a new buffer while a waveform generation is in
progress, NI-DAQ unaligns the previous buffer when the function returns.
The DSA devices use 32-bit data buffers. If you are using C or Delphi, you will need to type
cast your i32 array to i16 when you call
WFM_Load
. If you are using Visual Basic, you should
use the
nidaqr32.bas
file (instead of
nidaq32.bas
) to relax type checking on buffer. The
DSA devices use the upper 18 bits of each buffer element. The lower 14 bits are ignored and
you should set them to zero.