Unclear fakemodem kmdf sample behavior
in [Device Drivers]
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From: Stanislav Petrenko on 19 Oct 2006 07:42 Dear All. I am trying to adopt fakemodem (or serial) sample using WDK 5744. I built it and verified using hyperterminal. Trying to install fakemodem onto toaster bus driver I see sample fully functional. Trying to install fakemodem onto PCI bus driver (PCI modem) I see that COM properties are not available. Trying to install fakemodem onto HDAudio bus driver (HDAudio modem) I see that COM properties are back, however TAPI access doesnot work any more. Looking through IRP flow I cannot see any major drawback for such behavior. Does anybody know anything about the matter? -- Thanks, Stanislav.
From: chris.aseltine on 19 Oct 2006 14:17 Stanislav Petrenko wrote: > I am trying to adopt fakemodem (or serial) sample using WDK 5744. I built it > and verified using hyperterminal. Trying to install fakemodem onto toaster > bus driver I see sample fully functional. Trying to install fakemodem onto > PCI bus driver (PCI modem) I see that COM properties are not available. > Trying to install fakemodem onto HDAudio bus driver (HDAudio modem) I see > that COM properties are back, however TAPI access doesnot work any more. Do those device classes load filters above or below the driver? There is a large set of serial IOCTLs that must be supported for most userspace COM port applications to work. If they are being filtered, you will experience random behavior.
From: Stanislav Petrenko on 20 Oct 2006 06:01 No, they do not. Actually I found that the issue is specific for KMDF fakemodem only. The WDM fakemodem from the same WDK 5744 works correctly. It seems for me that is bug in WDF support. I submitted a feedback into Microsoft Connect. -- Thanks, Stanislav. "chris.aseltine(a)gmail.com" wrote: > Stanislav Petrenko wrote: > > > I am trying to adopt fakemodem (or serial) sample using WDK 5744. I built it > > and verified using hyperterminal. Trying to install fakemodem onto toaster > > bus driver I see sample fully functional. Trying to install fakemodem onto > > PCI bus driver (PCI modem) I see that COM properties are not available. > > Trying to install fakemodem onto HDAudio bus driver (HDAudio modem) I see > > that COM properties are back, however TAPI access doesnot work any more. > > Do those device classes load filters above or below the driver? > > There is a large set of serial IOCTLs that must be supported for most > userspace COM port applications to work. If they are being filtered, > you will experience random behavior. > >
From: Doron Holan [MS] on 21 Oct 2006 19:38 if you can give us as many details as possible so that we can reproduce the problem that would help figure out what is going on. d -- Please do not send e-mail directly to this alias. this alias is for newsgroup purposes only. This posting is provided "AS IS" with no warranties, and confers no rights. "Stanislav Petrenko" <StanislavPetrenko(a)discussions.microsoft.com> wrote in message news:E98D1508-740A-489F-B9B9-394C315C6D74(a)microsoft.com... > No, they do not. > > Actually I found that the issue is specific for KMDF fakemodem only. The > WDM > fakemodem from the same WDK 5744 works correctly. > > It seems for me that is bug in WDF support. I submitted a feedback into > Microsoft Connect. > > -- > Thanks, Stanislav. > > > "chris.aseltine(a)gmail.com" wrote: > >> Stanislav Petrenko wrote: >> >> > I am trying to adopt fakemodem (or serial) sample using WDK 5744. I >> > built it >> > and verified using hyperterminal. Trying to install fakemodem onto >> > toaster >> > bus driver I see sample fully functional. Trying to install fakemodem >> > onto >> > PCI bus driver (PCI modem) I see that COM properties are not available. >> > Trying to install fakemodem onto HDAudio bus driver (HDAudio modem) I >> > see >> > that COM properties are back, however TAPI access doesnot work any >> > more. >> >> Do those device classes load filters above or below the driver? >> >> There is a large set of serial IOCTLs that must be supported for most >> userspace COM port applications to work. If they are being filtered, >> you will experience random behavior. >> >>
From: Stanislav Petrenko on 7 Nov 2006 12:12
Sorry for late responce. I see the described behavior on the system containing HD Audio modem codec. Test system is Windows XP SP1 (clean install). HD Audio bus driver is installed using kb888111.exe. To reproduce the issue it is needed to make the following steps. 1. Install WDK 5840. 2. Build fakemodem using Windows 2000 x86 build environment. (Start environment, go into kmdf fakemodem folder, run build -ceZ.) 3. Run devmgm.msc, select Modem Device on High Definition Audio Bus, right click, run Update driver, select path to fakemodem. Point to path with wdf distributables if necessary. 4. Wait till the driver is successfully installed. 5. Reboot. 6. Open Hyperterminal, connect using "Fakemodem controllerless..." 7. Type AT, see that nothing happens. 8. Connect using "COM3", see that nothing happens again or a message "Another program is using...". In the WDK 5744 connectrion through COM worked well, in the WDK 5840 neither connection though COM nor through TAPI works. 9. That is the problem. I submitted feedback into connect and also attached IRP logs for setup and test phases. -- Thanks, Stanislav. "Doron Holan [MS]" wrote: > if you can give us as many details as possible so that we can reproduce the > problem that would help figure out what is going on. > > d > > -- > Please do not send e-mail directly to this alias. this alias is for > newsgroup purposes only. > This posting is provided "AS IS" with no warranties, and confers no rights. > > > "Stanislav Petrenko" <StanislavPetrenko(a)discussions.microsoft.com> wrote in > message news:E98D1508-740A-489F-B9B9-394C315C6D74(a)microsoft.com... > > No, they do not. > > > > Actually I found that the issue is specific for KMDF fakemodem only. The > > WDM > > fakemodem from the same WDK 5744 works correctly. > > > > It seems for me that is bug in WDF support. I submitted a feedback into > > Microsoft Connect. > > > > -- > > Thanks, Stanislav. > > > > > > "chris.aseltine(a)gmail.com" wrote: > > > >> Stanislav Petrenko wrote: > >> > >> > I am trying to adopt fakemodem (or serial) sample using WDK 5744. I > >> > built it > >> > and verified using hyperterminal. Trying to install fakemodem onto > >> > toaster > >> > bus driver I see sample fully functional. Trying to install fakemodem > >> > onto > >> > PCI bus driver (PCI modem) I see that COM properties are not available. > >> > Trying to install fakemodem onto HDAudio bus driver (HDAudio modem) I > >> > see > >> > that COM properties are back, however TAPI access doesnot work any > >> > more. > >> > >> Do those device classes load filters above or below the driver? > >> > >> There is a large set of serial IOCTLs that must be supported for most > >> userspace COM port applications to work. If they are being filtered, > >> you will experience random behavior. > >> > >> > > > |