Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 118)

daqAdcTransferSetBuffer
Also See: daqAdcTransferStart, daqAdcTransferStop,
daqAdcTransferGetStat, daqAdcSetAcq,
daqAdcTransferBufData
Format
daqAdcTransferSetBuffer(handle, buf, scanCount, transferMask)
Purpose
daqAdcTransferSetBuffer configures transfer buffers for acquired data, and can also be used to
configure the specified user- or driver-allocated buffers for subsequent acquisition transfers.
Parameter Summary
Parameter Type Description
handle DaqHandleT Handle to the device for which an ADC transfer is to be
performed
buf PDWORD Pointer to the buffer for which the acquired data is to be
placed
scanCount DWORD The total length of the buffer (in scans)
transferMask DWORD Configures the buffer transfer mode
Parameter Values
handle: obtained from the daqOpen function
buf: must be a valid pointer to memory whose size is at least:
(scanCount) * scan size * 2 (the sample size, normally 2 bytes)
scanCount:
valid values for buffer length are 1 to 4,294,967,295 scans, however, memory limitaions apply
transferMask: see table below
Parameter Type Definitions
transferMask
Definition Description
DatmCycleOn Defines the buffer as a circular buffer
DatmCycleOff Defines the buffer as a linear buffer
DatmUpdateSingle Defines the update mode as single sample
DatmUpdateBlock Defines the update mode as block update
DatmDriverBuf Causes the driver to allocate the acquisition transfer buffer as a circular buffer
DatmUserBuf Specifies a user-allocated and managed acquisition transfer buffer
DatmIgnoreOverruns Ignores buffer overruns. Upon a buffer wrap, no error will be returned.
Returns
DerrNoError No error
4.2-62 Daq API Command Reference 988594 Programmer’s Manual