FIFO DMA host question

[crossrulz]

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@FraBaggio1 wrote:

So the problem is that I am generating more samples than the host buffer (that is in my case1Msamples=2^20). Is it right?

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Correct.

[FraBaggio1]

Thank you Crossrulz,

I have another question. If I wanted the host buffer to be greater than 2^20 (that is the Excel limit) could I save data without passing from saving into excel?  

Regards

Francesco

[crossrulz]

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FraBaggio1 wrote:

If I wanted the host buffer to be greater than 2^20 (that is the Excel limit) could I save data without passing from saving into excel?

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You are doing that now.  The Write To Delimited File does not involve Excel.  It writes a text file.

[FraBaggio1]

Ok, but if I set the host buffer at 1.6 Msamples it gives me an error. So I think that there is a limit in "Write To Delimited File" or not?

[crossrulz]

Probably an Out Of Memory error.

You might want to look into using a Producer/Consumer setup so that you can log in parallel and write smaller chunks to the file.

[FraBaggio1]

I saw the NI example, but I don't understand where to save data. In the consumer loop with a delimited spreadsheet?

Thank you 

[crossrulz]

My recommendation is to look inside of the Write Delimited Spreadsheet and see how it works.  So for the consumer, open the file before the loop and close it after the loop.  Inside of the loop, use Array To Spreadsheet String for format your data and then Write To Text File to write it to the file.

[FraBaggio1]

And so, what would be the advantages of using a producer/consumer loop? This way I could store more data because data is written in small chunks?

[crossrulz]

The writing in smaller chunks is a bid advantage.  The other is that the logging can happen in parallel with the acquisition.

[FraBaggio1]

And how can I decide the chunk size?