Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 112)

daqAdcTransferBufData
Also See: daqAdcTransferSetBuffer,
daqAdcTransferGetStat, daqSetTimeout
Format
daqAdcTransferBufData(handle, buf, scanCount, bufMask, retCount)
Purpose
daqAdcTransferBufData requests a transfer of scanCount scans from the driver allocated acquisition
buffer (driver buffer) to the specified linear data retrieval buffer (buf). The driver buffer is configured with
the daqAdcTransferSetBuffer function.
Parameter Summary
Parameter Type Description
handle DaqHandleT Handle to the device from which the ADC buffer
should be retrieved
buf PWORD Pointer to an application-supplied buffer in which to
place the buffered data
scanCount DWORD Number of scans to retrieve from the acquisition buffer
bufMask DaqAdcBufferXferMask A mask-defining operation depending on the current
state of the acquisition buffer
retCount PDWORD A pointer to the total number of scans returned, if any
Parameter Values
handle: obtained from the daqOpen function
buf: must be a valid pointer to memory whose size is at least equal to:
[(scanCount) * (the channel count) * (the sample size, normally 2 bytes)]
scanCount:
valid values are 1 to length of the driver buffer (see daqAdcTransferSetBuffer
function)
bufMask: see table below
retCount: a valid pointer to a long integer variable (4 bytes) in which the total number of scans returned
(from 0 to scanCount) will be stored upon return of this function
Parameter Type Definitions:
bufMask-(DaqAdcBufferXferMask)
Definition Description
DabtmOldest Retrieve oldest unread scans from driver buffer
DabtmNewest Retrieve newest unread scans from driver buffer
DabtmWait Wait for requested amount of data to become available
DabtmRetAvail Return immediately with whatever data is available
DabtmNoWait Return immediately, only retrieve if requested data is available
DabtmRetNotDone Return immediately if still active
4.2-56 Daq API Command Reference 988594 Programmer’s Manual