[wdmaudiodev] WavePci DmaChannel problem for MSVAD.
- From: "swapnil kamble" <swap.kamble@xxxxxxxxx>
- To: microsoft.public.development.device.drivers@xxxxxxxxxxxxxxxx, ntdev@xxxxxxxxxxxxx, wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 2 Sep 2008 13:13:25 +0530
Hi,
I am new to Device Drivers. I am trying to replace WavePci in place of
WaveCyclic in MSVAD. I am understanding WavePci implementation from sample
AC'97. But since it is a real hardware driver with use of DMA,register
etc.. So how can I avoid these DMA related code. like
1. It requires AdapterObject. which is created by
DmaChannel->GetAdapterObject(); and DmaChannel is created by Port->
NewMasterDmaChannel(); (see driver\wavepciminiport.cpp)
2. In RevokeMappings() implementation we need index of
stBDList. (see driver\wavepcistream.cpp)
// Get current index
nCurrentIndex = Wave->AdapterCommon->
ReadBMControlRegister8 (m_ulBDAddr + X_CIV);
I couldn't figure out from where this register gets
value.i.e. who writes currentIndex on this register ? And If I want to do it
without actual register how can I do it ?
I also have question on device powerstate used in AC'97 sample. In
PowerDevice2/3 case why MoveBDList is used ? Since I cannot add this
implementation in my virtual driver will affect on functionality of the
driver.
Thanks in Advance.
--
...Swapnil
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