[wdmaudiodev] Re: Problem on setting wavecyclc

  • From: "PB" <peterbla@xxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Sat, 2 Jul 2005 00:22:48 +0800

Really thank for your kindy suggestion. We now try to use WavePCI instead. 
Thank you very much.

If it's possiblem, any WavePCI reference we can have to have faster 
constructing the code with WHQL? Is there any specific part of WavePCI we need 
to focus when writing the driver? Thanks
  ----- Original Message ----- 
  From: Sam Tertzakian 
  To: wdmaudiodev@xxxxxxxxxxxxx 
  Sent: Friday, July 01, 2005 1:47 PM
  Subject: [wdmaudiodev] Re: Problem on setting wavecyclc

  Sorry, for the delay in the response.


  What I meant was.I mananged to get audio to play/record.but, for various 
reasons some of the WHQL tests would not pass.


  It is for this reason, I switched to WavePCI. After that, the WHQL tests 


  I would be happy to provide you source code, but I just don't have it now.


  Again, I suggest you use WavePCI instead.it is a lot easier to understand and 
you have more control over the data movement in the driver.



  From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of PB
  Sent: Thursday, June 23, 2005 7:33 AM
  To: wdmaudiodev@xxxxxxxxxxxxx
  Subject: [wdmaudiodev] Re: Problem on setting wavecyclc


  Thanks for your reply.


  In fact, I have tried to write the driver by using WavePCI, but the IC 
manufacturer suggested us to use WaveCyclic instead of WavePCI. I am very happy 
to hear you getting WaveCyclic works. If it's possiblem, can you just let me 
know the setting of Master Channel? or just please give us only the part of DMA 
channel source code for reference? This is really thanks.




    ----- Original Message ----- 

    From: Sam Tertzakian 

    To: wdmaudiodev@xxxxxxxxxxxxx 

    Sent: Thursday, June 23, 2005 3:58 AM

    Subject: [wdmaudiodev] Re: Problem on setting wavecyclc


    I struggled for a long time with WaveCyclic model. I finally got it work, 
but I can tell you this.even if you get it to work, you will have other 


    You should not use WaveCyclic. Use WavePCI instead. (Don't let the "pci" 
bother you.you can use it for any kind of driver).


    You will be a lot happier. 



    From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of PB
    Sent: Sunday, June 19, 2005 9:19 AM
    To: wdmaudiodev@xxxxxxxxxxxxx
    Subject: [wdmaudiodev] Problem on setting wavecyclc


    I am writing an window audio driver by Microsoft 
    Window Driver Development Kit(DDK) for window XP. 
    I have followed the archecture of the driver sample
    code provided under the folder SB16 which are using
    WaveCyclic Interface and Slave Channel method to build
    the sound card audio driver. 


    However, since our chip on the sound card have not 
    provide us the default channel, we use the Master Channel
    method to create DMA channel and using allocate buffer API
    similar as Slave method provided in the sample code.
           ntStatus = 
                   &MyDmaChannel,      // OutDmaChannel
                   NULL,             // OuterUnknown (opt)
                   NULL,             // ResourceList (opt)
                   MAXLEN_DMA_BUFFER,    //Maximum Length            
                   TRUE,             // Dma32BitAddresses
                   FALSE,            // Dma64BitAddresses
                   Width32Bits,      // DmaWidth
                 );               // DmaPort
            if (NT_SUCCESS(ntStatus))
                ULONG  lDMABufferLength = MAXLEN_DMA_BUFFER;
                do {
                  ntStatus = 
                  lDMABufferLength >>= 1;
                  _DbgPrintF(DEBUGLVL_TERSE, ("lDMABufferLength = 0x%x", 
                } while (!NT_SUCCESS(ntStatus) && (lDMABufferLength > 
(PAGE_SIZE / 2)));


            if (NT_SUCCESS(ntStatus))


    However no matter how we tried, we cannot get the audio sound out.
    We have seen in the debugger that all the register of our chip is now 
controllable and the
    address of the allocate addressed is sured can written to our audio chip.
    We have seen the sequence in the window such as:


    can be runned under the testing on debugger. 
    I have seen from the MSDN help menu that for master channel, user need to
    use the API "copyto", "copyfrom" to copy data from and to the audio buffer.
    It seems that it is not necessary in the slave channel method. Is it really
    necessary in the master channel method?
    And how can I know the address of where the data come from when Window 
    wave file? I have no method to fill in the parameter of the "copyto",
    "copyfrom" API to use them.

    Or anyone can post the reference code for masterchannel  of Driver?


    Thans you very much



    Best Regards,


Other related posts: