DMA FIFO size evolution

[Massif]

        Dear

In the project used a cRIO with a NI9411 slot.

I received data form the FPGA to the host by a DMA FIFO.

On FPGA, all is ok.

On the Host, the size of the FIFO, depend of the user (he stop the acquisition when he would like : stop the acquisition's loop).

Questions:

1 Can I change the FIFO size during the acquisition?

2 When the user stop the acquisition, the tranfert is not complet and I have a error message. Is there a solution?

  Massif

[ChristopheS.]

Hi,

Here is the response to your question :

1) No, it's not possible to change the DMA FIFO size during the acquisition, you need recompile the FPGA VI with the new parameter.

2) Yes, you can ignore this specific error with a "generic handler" function, or you can use the property node that return the number of point into the DMA canal to wait that theire is no data.

Regards,

[Massif]

  Hi Christophe.

Thank you for these short and complet answers.

    Julien