NIMC_returnDataBufferNotEmptyError -70025 when CPU busy

[NIMATT]

I am currently getting NIMC_returnDataBufferNotEmptyError (-70025) errors intermittently when the computer processor is busy. My program tends to be very active updating status but is only using about 20-40 % of the CPU. The  problem occurs when the CPU is at or around 100% (another process is using the CPU).  I have tried to detect all errors and repeat commands when the error is detected however it has not resolved my issue.  It seems that a call to a previous command fails to clear / read all the data from the buffer and it is not detected until the next command is called.

I would like to eliminate the error however I dont know the source of the issue. It seems to be a driver/firmware issue but I have a hard time believing it.

Some things I do that may be relevant:

-I force all ni commands to be spaced out by at least 10 ms. 

-Before each command is sent I wait for the ready to receive bit to be set.

-All commands in my software are surrounded by thread locks.

-I only use the _rtn commands to avoid managing the buffer. 

-After each command I check the return and if it fails I try again until it succeeds.

Some more information that may also be relevant:

-I have the same code on three different systems. Two of which are older and have the issue, one is newer and it runs with out issue.

-The problem showed up after the cards firmware was updated to the latest version and new software was added.

The computer that has issues:

Windows XP SP3

Pentium 4 3GHz

2GB RAM

NI version is 8.3

PCI Cards in the computer:

7344 and 7340

both have the same firmware version:

7.40.3003 / 7.32.3003 / 7.00.3001 / 7.00.3001

Any suggestions on what to check or do to avoid the issue?

Matt

[Wee-Bey]

Hi Matt,

So there is a KnowledgeBase that addresses how to handle the error for the issue, and describes how it occurs. Give this a read.

http://digital.ni.com/public.nsf/allkb/B26517355796859E86256B490055DBC7