Normal 0 21 false false false MicrosoftInternetExplorer4 Normal 0 21 false false false MicrosoftInternetExplorer4 /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";}@page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;}div.Section1 {page:Section1;}--> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tableau Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}Hi, I’m tryingto build an MFC application with MSVC++6, where I would continuously acquiresamples on 8 analog channels of a USB-6008. I’m using the DAQmx C functions. The sampling rate is rather low (100 Hz), butit is important that all the sample values are written to disk. Also, I want toread the digital lines every second (that part is easy by using the Timer classin MFC). So I triedthis C example code: ContAcq-IntClk.c. It explains how to acquire data continuously, using a callbackfunction. I took a modified version ofthis program where it saves the data on disk. I tried different values, but Ican’t get all the data written, there are always gaps (dropped values). What Iwould like to achieve is that: when more than half of the internal buffer isfilled, the first half is written to disk. After that, when the buffer iscompletely filled and start to be filled from its beginning, the second half iswritten to disk and so on. But now I'm lost, I have no idea of how to achieve that. It would begreatly appreciated if you could tell me how to code it in C++. Thank youin advance /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";}@page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;}div.Section1 {page:Section1;}--> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tableau Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}Marc Melillomarc.melillo@umontreal.ca

Multifunction DAQ

Hello

How did you solve the problem?

I have the same issue like Marc.

Best Regards

Norbert

Message 11 of 11

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