 USB in Labview 6 |
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 Jun 30 2008, 08:41 PM
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One hit wonder! Member Posts: 1 Joined: 30-June 08 Member No.: 11882 Using LabVIEW Since:1994 LV:6.0 ,. ,. 
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I am looking for someone who has made Labview 6i work with a USB device. I am building a USB device and I have Labview 6 on hand and hate to buy the upgrade. Can anyone help?
DrTrey
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Jun 30 2008, 08:41 PM
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Jul 2 2008, 06:24 PM
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 Very Active V I Engineering, Inc.  Posts: 89 Joined: 26-October 06 Member No.: 6627 Using LabVIEW Since:2004 LV:8.5 ,8.0.1 ,7.1.1 
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Wow I don't think I can help but could you clarify a little please.
QUOTE I am looking for someone who has made Labview 6i work with a USB device. Do you mean, have LabVIEW interact with a USB device? What kind of USB device, USB camera, NI-USB DAQ device? USB thumb drive? Do you mean running LabVIEW from the USB drive? Do you mean as a development system? Do you mean running a LabVIEW executable? Do I ask too many questions? -------------------- "When I look at the smiles on all the children's faces, I just know they're about to jab me with something."
"Oh, people can come up with statistics to prove anything, 14% of people know that." "If you really want something in this life, you have to work for it - Now quiet, they're about to announce the lottery numbers!" "Weaseling out of things is important to learn. It's what separates us from the animals ... except the weasel."
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Jul 14 2008, 05:53 PM
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#3
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 <customize this text> Premium Member  Posts: 1012 Joined: 9-April 04 From: Rotterdam Member No.: 349 Using LabVIEW Since:1992 LV:8.5.1 ,8.2.1 ,7.1.1 
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QUOTE (DrTrey @ Jun 30 2008, 04:41 PM)  I am looking for someone who has made Labview 6i work with a USB device. I am building a USB device and I have Labview 6 on hand and hate to buy the upgrade. Can anyone help? DrTrey You give indeed to little information about the type of device and such. If it is some DAQ device or similar however the standard mode of operation is to write a device driver and the according user space DLL wrapper. That can be easily imported into LabVIEW through the call Library Node in a way that is completely independant of the LabVIEW version. Other means would be to use libusb to control your device. Interfacing LabVIEW to libusb through the Call Library Node is about the same in terms of version dependance but the libusb API is not really meant to be interfaced by high level applications like LabVIEW or VB and you will run in some issues that are usually most easily solved by writing a wrapper DLL that translates between the low level API and the LabVIEW Call library Node. Last but not least there is USB Raw device support in NI-VISA. Not sure though from which version of LabVIEW this VISA feature is properly supported. While the feature is completely implemented in VISA, LabVIEW needs to support some extra API access modes to use this feature. A quick look in LabVIEW 6.0 shows that the necessary Nodes to use USB through VISA are not present. LabVIEW 6.1 is the first to support this interface but you will need a recent version of VISA installed on your computer. The first VISA versions had lot's of difficulties supporting USB device RAW access. Princiapially option 1 will require you to really write C code. The other two options won't but can't be really considered a lot easier. You will simply implement the bit level protocol of your USB device in LabVIEW itself. Option two will still require some serious C knowledge to be able to properly interface to libusb through the Call Library Node. From that perspective using VISA to control your USB device would be probably the simplest solution but don't expect it to be trivial. One disadvantage of the two last options will be that you can't really leverage off that solution for non-LabVIEW users such as Visual Basic, Visual C, etc. Rolf Kalbermatter
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Jul 14 2008, 06:40 PM
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 Certified Kool-Aid Kid Premium Member Posts: 1161 Joined: 6-December 02 From: Pittsburgh PA USA Member No.: 29 Using LabVIEW Since:1998 LV:7.1 ,. ,.
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QUOTE (rolfk @ Jul 14 2008, 01:53 PM) You give indeed to little information about the type of device and such. If it is some DAQ device or similar however the standard mode of operation is to write a device driver and the according user space DLL wrapper. That can be easily imported into LabVIEW through the call Library Node in a way that is completely independant of the LabVIEW version. Other means would be to use libusb to control your device. Interfacing LabVIEW to libusb through the Call Library Node is about the same in terms of version dependance but the libusb API is not really meant to be interfaced by high level applications like LabVIEW or VB and you will run in some issues that are usually most easily solved by writing a wrapper DLL that translates between the low level API and the LabVIEW Call library Node. Last but not least there is USB Raw device support in NI-VISA. Not sure though from which version of LabVIEW this VISA feature is properly supported. While the feature is completely implemented in VISA, LabVIEW needs to support some extra API access modes to use this feature. A quick look in LabVIEW 6.0 shows that the necessary Nodes to use USB through VISA are not present. LabVIEW 6.1 is the first to support this interface but you will need a recent version of VISA installed on your computer. The first VISA versions had lot's of difficulties supporting USB device RAW access. Princiapially option 1 will require you to really write C code. The other two options won't but can't be really considered a lot easier. You will simply implement the bit level protocol of your USB device in LabVIEW itself. Option two will still require some serious C knowledge to be able to properly interface to libusb through the Call Library Node. From that perspective using VISA to control your USB device would be probably the simplest solution but don't expect it to be trivial. One disadvantage of the two last options will be that you can't really leverage off that solution for non-LabVIEW users such as Visual Basic, Visual C, etc. Rolf Kalbermatter Excellent reply Rolf! I had to reply because I justread this Nugget (on the Dark-Side) by Shane where he introduces us to using VISA to interact with USB devices. I would have remained silent if the timing was not what it was. Ben
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| Time is now: 3rd December 2008 - 08:52 AM |