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Can I launch a DMA operation in DPC routine ?

Can I launch a DMA operation in DPC routine ?

Post by heartofdr » Wed, 27 May 2009 13:38:13


I am writing a dirver of a PCI AD card. The design of the card is
common .It based on the PLX9054 , and there is a FIFO on the local
side, when the fifo is half full? it triges the interrupt , then the
dirver launch a DMA to get the data.

At first , I followed the Packet Based DMA method , and the upper
application writer told me their software can't responds enough
quickly. They ask me to setup a buffer in my dirver, then the
gathering data stored in the buffe firstly, when the upper application
need, it read the buffer.

If I adhibit this method , It is the driver , not the application
become the original DMA launcher. So , the dirver must perform a DMA
opertion automatically after each "half full interrupt" occurs. The
only way and the only palace I can imaging is the DPC where begin a
DMA Read opertion.

IS IT Workability? thanks.
 
 
 
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