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question about the ddk video port driver

cz h
Intellectual 750 points

hello, I'm studying the video port driver , in the source code in "vportcap.c" , there is a  function "_configTransfer", it build a link as bellow based on the "chan->mergeFlds"

or

but I don't understand why the program used the edma like this , also I found the edma ISR" static void captureEdmaISR(Int tcc) " has a parameter tcc, how this parameter passed to this ISR, can anyone help me.