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Chapter 2 Function Reference — Align_DMA_Buffer
NI-DAQ FRM for PC Compatibles 2-22
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National Instruments Corporation
Align_DMA_Buffer
Format
status = Align_DMA_Buffer (deviceNumber, resource, buffer, count, bufferSize, alignIndex)
Purpose
Aligns the data in a DMA buffer to avoid crossing a physical page boundary. This function is
for use with DMA waveform generation and digital I/O pattern generation (AT-MIO-16F-5
and AT-DIO-32F only).
Parameters
Input
Output
Parameter Discussion
resource represents the DAC channel (for waveform generation) or the digital input or output
group (for pattern generation) for which NI-DAQ uses the buffer.
0: DAC channel 0.
1: DAC channel 1.
2: DAC channels 0 and 1.
11: DIG group 1 (group size of 2).
12: DIG group 2 (group size of 2).
13: DIG group 1 (group size of 4).
Name Type Description
deviceNumber i16 assigned by configuration utility
resource i16 represents the DAC channel or the digital input
or output group
buffer [i16] integer array of samples to be used
count u32 number of data samples
bufferSize u32 actual size of buffer
Name Type Description
alignIndex u32 offset into the array of the first data sample