How do I generate a pattern that is larger that the memory in a NI6541?

[davefisher]

How do I use a NI6541 to generate a pattern that is larger that the memory in a NI6541?

for example , If I have a ni6541 that has a 8 M sample memory and I need to send out 26M sample do I have to

do 4 sequences of

niHSDIO_InitGenerationSession(),

niHSDIO_AssignDynamicChannels (),

niHSDIO_ExportSignal ,

niHSDIO_WriteNamedWaveformU32(),

 niHSDIO_Initiate (),

niHSDIO_close()

or is there way to just load  and send new data once the card has been set up?

Thanks

Dave Fisher

[Kenn_N]

Dave,

Thanks for contacting National Instruments. This is the equivalent of streaming which is not supported on our HSDIO devices.  There is a version of the 6541 board that has 64MB that would give you enough room to load the entiree pattern onto the board.  You could attempt what you are saying about initiating the board 4 times over, but you will likely experience some latency between each close and initiate while the next 8MB is written to onboard memory. 

Regards,

[ryanm]

Hi Dave,

We have a beta version of the HSDIO driver which adds the functionality you are looking for.  If you give me your email address, I will be happy to provide more information.

Thanks,

Ryan

[davefisher]

Thank you

for the info about the new driver

My email is dfisher@pop500.gsfc.nasa.gov

if you are going to send me a zip file please rename the suffix.

regards dave