Transfer data from PL to userspace

Hi,

I am trying to transfer 32bits(4 words) from PL to userspace. So i added a dma engine and an axi interface to PS. In the PL, it writes to dma and in the application it reads the information. I need to transfer 32bit with a frequency of 5MHz and with that configuration the reading is too slow. I think that is strange because the throughput of dma is high and it should work fine so i don't know what to do.

If you need more information just tell me.

Thanks,
Davide

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0 bhfletcher over 11 years ago

I'm not sure that DMA is the best approach here if the data is small and slow. The easiest possible way would simply be to configure a PS-GPIO peripheral with access through EMIO. Connect this to your peripheral for data transfer. You could also turn your peripheral into an AXI custom peripheral and tie it directly through a GP port back to the PS.
Bryan
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0 bhfletcher over 11 years ago

I'm not sure that DMA is the best approach here if the data is small and slow. The easiest possible way would simply be to configure a PS-GPIO peripheral with access through EMIO. Connect this to your peripheral for data transfer. You could also turn your peripheral into an AXI custom peripheral and tie it directly through a GP port back to the PS.
Bryan
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