cRIO: build the path to write tdms file on a USB flash drive

I wrote the code in figure 1 below, for open & create a file tdms on my USB flash drive that is plugged into the USB cRIO.

The added path tdms is shown in figure 2 below.

But I get the error in figure 3 below. I wonder how I can solve this problem.

Cashany,

Make sure that the USB is formatted in FAT32 as the cRIO cannot mount NTSF or other file systems.

In addition, and this is potentially very important:

There is a known memory leak problem that is easy to avoid the code with the help of PDM on the cRIO (without code changes!).

This problem only occurs on vxWORKS targets (e.g., cRIO-9014), not on the PharLap targets (as I know).

The problem occurs when you close a PDM file reference, the vxWORKS OS can't properly unload the PDM library. Next time you open a PDM, the library reference is loaded again, if for a very long time you will run out of memory.

The solution is very simple:

on your cRIO, locate the file or - rt.ini, then scroll down to the section [LVRT] of the ini file and locate the key called "StartupDlls".

Make sure 'tdms.out' is included. For example, according to your cRIO, it may look like this:

StartupDlls = nisysrpc.out; NiRioRpc.out; NiViSrvr.out;

In this case, you would change the line to look like this:

StartupDlls = nisysrpc.out; NiRioRpc.out; NiViSrvr.out; TDMS.out;

 

This will prevent the LabVIEW runtime on the cRIO trying to unload the PDM library, forcing to be in memory of start up to eternity. This avoids the memory leak that you would otherwise experience.

Good luck!

Q

Tags: NI Software

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