Serial Port In Labview
In reply to: Hi Jan, Monitor the LabView activity on the COM port, and find the exact 'attribute' on which LabView fails to take from the COM port. Unfortunately, PortMon, a popular serial port monitor, doesn’t work on 64-bit Windows. Instead, apply API monitor API monitor 1) First, run LabView up to the point just before you see the error dialog. 2) Run API monitor, and check 'Data Access and Storage' and 'Devices' filter, to capture activity on COM port. 3) Go on LabView and see the error dialog. 4) Switch to API monitor, find error on the monitor log.
API monitor will show you communication API on which an error occurs. Windows Communications Functions What is the Comm API? When we know the Comm API, we can specify the 'attribute' LabView requires.
LabView has extensive list of drivers, whenever you want to communicate with any hardware in LAbview then you have to download its driver, NI VISA is the driver for communicating with serial port. After downloading this driver, install it and now run your LabView software.
And then, back to the Stellaris firmware, we can modify the source to support the 'attribute'. In reply to: Hi Jan, I had asked our field reps to try and get some assistance from NI on this issue.
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Unfortunately, it appears the best means of getting assistance from NI will be through their support channels which from your last post I assume you have started. I went ahead and pulled the LV evaluation down and believe I got enough installed to replicate what you are seeing.
I think this is the result of the Tiva Launchpad's use of Microsoft's USBSER.SYS driver to provide the virtual serial port through a basic implementation of the Communication Device Class' Abstract Control Model (CDC ACM). Based on NI's documentation, it looks like LabView uses SetCommState() and then verifies the baud rate with GetCommState(). From a small amount of research into these APIs, it looks like GetCommState() will always return the default baud rate in this case as this is a 'virtual' COM port. This likely explains why 9600 baud works as LV is able to verify it with this API Set/Get exchange. Launchpads that use FTDI chips for this feature are able to make use of the FTDI driver stack which includes a more full featured 'faked' COM port and don't use the in-box USBSER.SYS driver. I believe this is why they don't exhibit this problem. I'm not savvy enough with LV to determine if one can wire things up to ignore the error from the baud rate change.
There might also be a way to force LV to always use the driver port settings (as setup in the device manager's 'port settings'). One of those two options might get you past the issue. In reply to: Hi Jan, Does it give you the same message if you tell it to use the Windows settings (the other radio button)?
Hello Tsuneo, Thanks for the information. I had not actually made that assumption because I have seen the list of CDC events that get generated for these calls.
But it does look like the line coding tracking is the cause of this LV issue. The ICDI firmware does handle these events but it looks like it might be trying to be a bit too clever. I'm going to start the process of getting a respin for this firmware. This will also require a new release of to deliver the update to the boards. All content and materials on this site are provided 'as is'. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI.