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Device Drivers

Witawas Srisa-an
Embedded Systems Design and Implementation

Device Drivers

What are device drivers?

What are they used for?
Why are they important?

Sepura Port Devices Driver Download Windows 7

Why Do We Need Drivers?

Custom platforms

Contain many peripheral devices and kernel (e.g. CE) supported CPU

OAL development to get kernel to boot on the board
Device drivers to allow applications to access peripheral devices

Sepura Port Devices Driver Download Win 7

An Example

To access a serial port in Windows CE

calls CreateFile( ) on COMx
calls WriteFile( ) to write some bytes of data to the serial port
calls CloseHandle( ) to close the serial port.

Drivers in CE

A driver is simply a dynamic-link library (DLL)

DLLs are loaded into a parent process address space
Run in user mode (different than most OSs)
the parent process can then call any of the interfaces exposed from the DLL

LoadLibrary( )
LoadDriver( ) --- memory resident

Writing Device Drivers

Most of the time spent on system integration is in this process

Some devices have support on standard CE release and some don’t

Onboard or installable

Onboard devices may require platform dependent modification to the kernel image
Installable devices may require code to be more platform independent

Drivers APIs can also be used to provide application-level services

Device Driver Models

Device drivers, over the years, have become very complex

Drivers are separated into classes

Serial, network, audio, video, touch panel, etc.

Layer approach is used

To support a new device, a layer is modified instead of rewriting the entire driver
Processing functions required for a given class often do not require modification

Device Driver Architecture

Sepura Port Devices Driver Download Win 7

Stream-Interface

Allow accesses to an array of devices through basic file I/O interfaces

Often used for installable devices
The device manager (DM) manages stream-interface drivers

DM operates as its own process

Device driver DLLs are mapped into the address space

Other Driver Models

Native Interface
USB Interface
Network Device Interface Specification

Device Driver Labs

http://www.microsoft.com/downloads/details.aspx?FamilyID=486E8250-D311-4F67-9FB3-23E8B8944F3E&displaylang=en
Download lab tools from the course website
Create a simple Internet Appliance Windows CE project
Create a device driver workspace and build the workspace
Build OS image
Attach the device
Open prompt through build OS | Open Release Directory

dumpbin –exports StreamDrv.dll

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Device Drivers

Witawas Srisa-an

Embedded Systems Design and Implementation

Device Drivers

What are device drivers?

Sepura Port Devices Driver Download Windows 7

Why Do We Need Drivers?

Custom platforms

Sepura Port Devices Driver Download Win 7

An Example

To access a serial port in Windows CE

Drivers in CE

A driver is simply a dynamic-link library (DLL)

Writing Device Drivers

Most of the time spent on system integration is in this process

Device Driver Models

Device drivers, over the years, have become very complex

Device Driver Architecture

Sepura Port Devices Driver Download Win 7

Stream-Interface

Allow accesses to an array of devices through basic file I/O interfaces

Other Driver Models

Native Interface

USB Interface

Network Device Interface Specification

Device Driver Labs

http://www.microsoft.com/downloads/details.aspx?FamilyID=486E8250-D311-4F67-9FB3-23E8B8944F3E&displaylang=en

Download lab tools from the course website

Create a simple Internet Appliance Windows CE project

Create a device driver workspace and build the workspace

Build OS image

Attach the device

Open prompt through build OS | Open Release Directory