请问： 在DPC中启动 DMA没问题吧

要在驱动中设立缓冲，驱动先把采集到的数据放在这个缓冲中， 然后在寻找合适的时机通知应用层，要应用层来从中读取。

这样只能是驱动自己去发起DMA，而且是commom buffer型的， 读取后先把数据放到缓冲中。这样的话，只能是在FIFO半满中断来到时，在DPC中启动DMA，这样应该没啥问题吧？


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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.