Phytec eGrabber-4plus, Руководство по оборудованию

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Driver Software
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PHYTEC Meßtechnik GmbH 2004 L-608e_4
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Show digitization status
WORD Data_Present(WORD nDevNo);
return value: shows status of digitization
(values 0 - 15 (4-bit) )
The function Data_Present indicates if an even or odd image is stored
in the memory.
In the separate bits of the returnvalue the status for continuous or
single shot operation of the digitization is coded (see Figure 53).
Bit 0 and 2 indicate, that an even image was recorded, bit 1 and 3
represent an odd image. Bits 0 and 1 change their state with each
advent of an even or odd image.
Figure 53: Return Values of ‚Data_Present‘
For continuous grabbing this indicates when the content of the
corresponding memory region is occupied completely with a new
image. Each alteration of the status (0 to 1 and 1 to 0) indicates, that a
new field was recorded.
Bits 2 and 3 are set to 1, as soon as an even or odd image was
completely recorded. Those bits are used, in case only one image
should be taken (single-shot, defined by Set_Image ). The bits remain
set until a new digitization is started.
Caution:
Don’t call the status too often during digitization, since each inquiry
will occupy the PCI-bus, which might hinder the data transfer of the
Grabber. You might include delay times between inquiries, in order to
avoid slowing down digitization.