250us data from FPGA I/O

[VipinrajKK]

Hello everyone,

what’s the best method to get the latest data from FPGA every 250us in RT . I tried using DMA allocates enough FIFO depth . But the FIFO is over flowing . Can someone suggest me . What could be the reason for FIFO over flow . 
FPGA AI sampling rate is 100kS/s X 8 channels

so I will be getting 200 elements (25x8) every 250us

in RT I m checking 200 elements in DMA FIFO and loop rate is 250us

am I doing the right settings . Or should I run the loop higher rate . I tried that also , every 100us I m checking the DMA FIFO . That also not worked . Can someone suggest me better method ? 

Thank you

Vipinraj KK

[Intaris]

Hard to judge code we can't even see....

Should be do-able I think, but code is the key.

[VipinrajKK]

Hi

Please find the code below.

[Intaris]

Can't you just ZIP it instead of using RAR?

If you're looking for help, it's generally best to not put obstacles in the way of people giving up their free time to help you.

[GerdW]

Hi Vipinraj,

reduce the wait time in the loop to ~50µs…

[VipinrajKK]

Sorry, 

I thought winrar is  a free tool which everyone uses. I will upload .zip.

[VipinrajKK]

Hi,

Thanks for the reply. I will test the code and update .

[GerdW]

Hi Vipinraj,

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@VipinrajKK wrote:

I thought winrar is  a free tool which everyone uses.

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Why do you think so?

ZIP is built-in into Windows for free. (On LINUX too.)

7-zip is for free, but sometimes forbidden to be used on company computers.

WinRAR needs to be bought.

So use ZIP for public use. And pay your license fee for WinRAR!

[crossrulz]

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@VipinrajKK wrote:

I thought winrar is  a free tool which everyone uses. I will upload .zip.

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Many companies will block all software except for "approved" software.  I am personally a fan of 7-Zip, but my current employer actually has it on the "Rejected" (not just unapproved, but flat out rejected) list due to some standard not quite being correct.  But Windows handles zip files natively, so I can open those up no problem.

[VipinrajKK]

Ok, noted. thanks

Next time onwards I will make sure to upload it in zip format.