> occurring and Hyperterminal connects immediately. > IOCTL_SERIAL_WAIT_ON_MASK snippet, the delay is not > When I replaced break with return statement in above
#HYPERTERM USB DRIVER#
If you ever want your driver to work correctly, you need to read and understand both of them in their entirety. You're issued an IOCTL with the name IOCTL_SERIAL_WAIT_ON_MASK (note the word "WAIT" right there in the name), and you immediately complete it, and then problems ensue. > Information) which should return immediately. > WdfRequestCompleteWithInformation(Request, status, > statement encounters, next statement is
#HYPERTERM USB CODE#
> This was my previous code which is hanging. > To unsubscribe, visit the List Server section of OSR Online at > For our schedule of WDF, WDM, debugging and other seminars visit: > you should be pending (probably: IOCTL_SERIAL_WAIT_ON_MASK) instead of
#HYPERTERM USB SERIAL#
> that Hyperterminal is in an infinite loop of sending you serial IOCTLs that > seeing a 'delay of five seconds navigating between windows', my guess is > frequently, you aren't implementing the serial spec correctly. > As for your actual problem: well, as I have to tell people on this list > exact code, so why not just do it and save yourself the time? > right now, although it's easy to do and the 'fakemodem' sample gives you the > I wouldn't get hung up about writing out the SERIALCOMM entry manually > showing the impact or my approach is deviating from Does setting the registry values manually is > Can somebody provide a pointer to the things which I am Hyperterminal gets the information which it is looking for. With what valid values the above fields can be filled, so that I tried to get these values from Serial driver, but could not completelyĮxtract them in SerialStartMask. SERIAL_STATUS structure but I am unsure of the fields. When this is called I should provide the caller, a valid With length one and IOCTL_SERIAL_GET_COMMSTATUS ioctl is getting calledĬontinuously. When I type a character in the Hyperterminal, EvtDeviceIoWrite gets invoked WdfRequestCompleteWithInformation is not invoked. Might be getting desired information even though IOCTL_SERIAL_WAIT_ON_MASK snippet, the delay is not occurring and
When I replaced break with return statement in above Status, Information) which should return immediately. Once the break statementĮncounters, next statement is WdfRequestCompleteWithInformation(Request, This was my previous code which is hanging. Status = WdfRequestRetrieveOutputBuffer ( Request, sizeof(ULONG),
Kindly just have a glance at the following snippet: IOCTL_SERIAL_WAIT_ON_MASK is getting called continuously by theĬase IOCTL_SERIAL_WAIT_ON_MASK of Serial driver is returning immediately. I am at 100% CPU usage when the said delay occurs and Does setting the registry values manually is showing the impact or my approach is deviating from the actual purpose. from the hyperterminal are reaching to the driver but the point is regarding delay in and after connection.Ĭan somebody provide a pointer to the things which I am missing. The settings like baud rate, hardware, etc. In the driver EvtIoDeviceControl function, I have implemented all the possible 37 ioctl calls (IOCTL_SERIAL_GET_BAUD_RATE, IOCTL_SERIAL_SET_BAUD_RATE, etc.) by refering to kmdf-serial driver. Now when I open the created COMM port using hyperterminal, the device gets connected but there is significant delay of around 5 seconds in the connection and after connection also there is delay in every operation (like navigating between windows, etc).įor time being instead of creating the registry entry from the driver, I am manually creating the entry at HKLM-Hardware-Devicemap-Serialcomm so that the hyperterminal recognises the comm port. Even though the actual data should be to and from the device, I am simulating the data transfers by maintaining global buffer in the driver. Using CreateFile, ReadFile, WriteFile APIs, I can open the device, read and write data. I implemented EvtIoRead, EvtIoWrite and EvtIoDeviceControl functions and created symbolic link to the device in the driver. I have taken kmdf-toaster-function driver and kmdf-serial inf file as base and managed to load the function driver for the USB device. I started with completely ignoring the USB part like preparing the hardware, opening end points and configuring the device. The intention is to project custom USB device as a Serial Port Device so that the end user applications can read, write data using Hyperterminal or any other Win 32 API.
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