regarding act_screen.vi

[srikrishna]

Hi all,
Can any body tell me whats the act_screen.vi will do? and please explain it implementation?

[Coen]

Act_Screen.vi calculates the amount of data ("Display Blocksize") to be read from the ringbuffer for the next iteration of the program.

Best regards, Coen (BioSemi)

[srikrishna]

1)In the actiview program,what is the necessity to use a ring buffer?we had queue vis already,why it is not used in the program?

[Coen]

The ringbuffer allows direct memory access (DMA), please share your "queue vi" that achieves the same functionality with us.

Best regards, Coen (BioSemi)

[srikrishna]

Hello coen,
How you are achieving DMA programmatically in this ring buffer?

[Coen]

Writing data from the ActiveTwo system into the ringbuffer is handled by the USB driver (also see viewtopic.php?t=76), ActiView just reads the data from the ringbuffer.

Best regards, Coen (BioSemi)