Porting drivers windows ce 6.0

Sorry for not mentioning the type of Driver. Whats the underlying bus where the adapter is connected to? Win7 driver CE has its own functions to talk to the underlying bus.

Win7 uses WDF model where as Ce uses its own native interface for developing driver. The underlying bus-interface is PCI. The content you requested has been removed. Ask a question. Quick access. Search related threads. Remove From My Forums.

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With a traditional account Use another account. Account Deactivated. Account Reactivation Failed Sorry, we could not verify that email address. Account Activated Your account has been reactivated. Sign in. There are three main processes in Windows CE that load devicedrivers. Each process expects the driver to conform to a particulardriver mode.

The first process loaded by the kernel is filesys. This process loads file system drivers which mustconform to the file system driver model. After the file system and registry are loaded the device managerprocess, device. This process loads the majority of thedevice drivers in the system and they all expose the stream driverinterface. Lastly, the graphics, windowing, and events subsystem gwes.

These drivers conform to specialized driver models for theirparticular function. The following Table 1 below summarizes the threesystem processes that load device drivers. Windows CE supports the concept of installable file systems.

The operating system provides a template for functions that you needto develop for a file system. The FSD may export the full range offunctions entry points or it can exclude particular file systemfunctions if you do not want that function to be available. The FSD Managerautomatically supplies stub functions for any functions that you choosenot to supply for your file system. These stub functions return anerror code. As a result, if an application tries to create or remove adirectory on a volume that belongs to your FSD, the call fails.

Thisvalue is passed back to the FSD Manager services that query, read, andwrite to that disk. This driver model has roots in the earliest implementations ofUnix. A stream driver exports functions to open, close, read, write,seek, or control the underlying hardware. That is, anyperipheral that produces or consumes streams of data as its primaryfunction is a good candidate to expose the stream interface.

A goodexample is a serial port device. An example of a device that does notproduce or consume data in the traditional sense would be a displaydevice, and indeed, the stream interface is not exposed for controllingdisplay hardware.

A stream interface driver receives commands from the Device Managerand from applications by means of file system calls. The driverencapsulates all of the information that is necessary to translatethose commands into appropriate actions on the devices that itcontrols.

All stream interface drivers, whether they manage built-in devicesor installable devices, or whether they are loaded at boot time orloaded dynamically, have similar interactions with other systemcomponents. The following illustrations show the interactions between systemcomponents for a generic stream interface driver that manages abuilt-in device, and for a stream interface driver for a PC Card Clientdevice.

Figure 1 , below , showsthe architecture for stream interfacedrivers for built-in devices that are loaded by the Device Manager atboot time. Block Drivers A block driver allows reads and writes of the underlying hardwareresource through fixed sized block of data. Block devices do not allowyou to read or write individual bytes of data. Block devices are ideallysuited for mass storage and persistent storage applications, such asdisk drives or nonvolatile RAM disks.

Drivers for block devices generally expose the stream interface, andthe block devices appear as ordinary disk drives. The applicationcalls the ReadFile function using ahandle to a file that is stored on the block device. The FAT file system for example, translates the read request tological blocks.

The FAT file system searches the buffer cache for therequested blocks. If these are not present, it issues an IOControlrequest to the corresponding block device driver to read bytes from theblock device. Then, the block device driver receives the IOControlrequest, and then fulfills the request by accessing the block devicethrough one of its low-level interfaces.

The FAT file system implementation supports block devices. The FATfile system does not read or write to block devices directly; it usesunderlying block device drivers for all access to block devicehardware. The block device driver must present the block device to theFAT file system as a block-oriented device.

Block device driverstransparently manage or emulate ordinary disk drives, so applicationsdo not need to behave differently when reading and writing files to theblock device.

Bus Drivers A bus driver is any software that loads other drivers. In this sensedevice. A bus driver can bethought of as having a hierarchical structure starting with the rootbus driver. Bus drivers have one or more of these responsibilities:. Loading drivers on aphysical bus that the bus driver does not directly manage. An example is the Bus Enumerator regenum.

Calling ActivateDeviceEx directly to load a device driver. The loaded device drivermight manage hardware indirectly through anotherdevice driver. To allow access to a device driver with CreateFile , bus driversshould provide the Device Manager with enough information to createbus-relative names and enable device handles. They should also provideenough information to identify themselves to drivers and applicationsfor bus control IOCTL operations. A bus driver can specify a busrelative name for the driver, but fordrivers and applications to be able to access the bus driver for buscontrol operations, the bus driver must expose a stream interface.

Bus Agnostic Drivers A bus agnostic driver is written without knowledge where the underlyinghardware device that it manages is located. The device may reside onthe local microprocessor bus or it may be on a CompactFlash cardinserted into the system. A bus agnostic driver does not call functions that are specific to ahardware platform. Each driver gets its resources from the registry,requests configuration information from its parent bus driver, setspower states through its parent bus driver, and translates busaddresses to system addresses through its parent bus driver.

Typically,you can migrate bus agnostic drivers more easily between hardwareplatforms than other types of drivers. A bus agnostic driver must adhere to the following tasks todetermine the location of its hardware resources in the system:. Open the device key bycalling the OpenDeviceKey function. Obtain a hardware and bycalling the HalTranslateBusAddress function to translate thebus-specific address to a system physical address.

Obtain a virtual address bycalling the MnMapIoSpace function to map the system physical address. Reset your hardware anddisable the interrupt. You should assume that your ISR will access the cardregister to identify the interrupt. TransBusAddrToStatic is needed tomap the system physical address for hardware. Begin the IST and enable theinterrupt. Layered vs. Monolithic Drivers Most device drivers consist of platform or hardware specific code andmodel or device type specific code.

This is a slight misnomer because the two pieces are actuallysoftware modules or a way of organizing the source code. Ifa device driver is organized in this way it is referred to as a layereddriver. A monolithic driver is one that does not separate the source code inthis fashion.

However, this does make the drivermore difficult to maintain and less portable to future versions ofWindows CE.