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QuestionUSB Problems? Pin
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QuestionSuggested strategies for ensuring Windows keeps up with USB device? Pin
Matt T Heffron5-Feb-15 15:34
professionalMatt T Heffron5-Feb-15 15:34 
Scenario:
  • We have a third-party data acquisition device which communicates over USB utilizing USB Bulk Endpoints.
  • We will be using the device to generate approximately 34Kbytes of data / sample at about 30Hz sampling rate (total about 1MB/sec).
  • We can trigger a sample acquisition and the device can hold the 34K of data until it is "sent" via the USB.
  • The vendor states the device is "streaming the data out of a small hardware buffer (512 bytes) on the device directly to the USB to achieve the highest performance".
  • The device will refuse to acquire the next sample unless the previous 34K has all been sent.
  • Missing a data acquisition is an unacceptable condition.


Potential issue:
As many of us have experienced, Windows sometimes just seems to “zone out” (daydreaming?) and this might cause the USB driver to go too long between requests for data.
The total amount of data bandwidth is not pushing the bounds of USB capabilities, but the timing is (in conjunction with the small device USB buffer).

Questions:
  • What are recommended strategies for addressing the issue above?
  • On a modern multi-core platform, is it a realistic concern?
  • Can USB servicing be made a high(er) priority activity for the OS?
  • Would Windows Embedded Compact be a better "host" OS?
    * At least for the data collection?
    * How different is development for Windows Embedded Compact?

Thanks.
A positive attitude may not solve every problem, but it will annoy enough people to be worth the effort.

AnswerRe: Suggested strategies for ensuring Windows keeps up with USB device? Pin
Jochen Arndt5-Feb-15 22:20
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GeneralHuman monitoring device Pin
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QuestionPC Power Supply Voltages Pin
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QuestionUSB , SCSI , LUN … file ...disk...How does it all fit together? Pin
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Questionlaptop power setting Pin
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