Virtual serial driver sample (V2)

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This sample demonstrates these two serial drivers:

  • A simple virtual serial driver (ComPort)

  • A controller-less modem driver (FakeModem).This driver supports sending and receiving AT commands using the ReadFile and WriteFile calls or via a TAPI interface using an application such as, HyperTerminal.

This sample driver is a minimal driver meant to demonstrate the usage of the User-Mode Driver Framework. It is not intended for use in a production environment.

For more information, see the Serial Controller Driver Design Guide.

Code tour

internal.h

  • This is the main header file for the sample driver.

driver.c and driver.h

  • Definition and implementation of the driver callback function (EVT_WDF_DRIVER_DEVICE_ADD) for the sample. This includes DriverEntry and events on the framework driver object.

device.c and driver.h

  • Definition and implementation of the device callback interface for the sample. This includes events on the framework device object.

queue.c and queue.h

  • Definition and implementation of the base queue callback interface. This includes events on the framework I/O queue object.

ringbuffer.c and ringbuffer.h

  • Definition and implement of ring buffer for pending data.

VirtualSerial.rc /FakeModem.rc

  • This file defines resource information for the sample driver.

VirtualSerial.inf / FakeModem.inf

  • INF file that contains installation information for this driver.