Device Drivers
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Witawas Srisa-an
Embedded Systems Design and Implementation
Device Drivers
What are device drivers?
- What are they used for?
- Why are they important?
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
Zebris Port Devices Driver
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
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
Zebris Port Devices Driver Tp-link
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
Dostları ilə paylaş:
Micro-vu driver
DDR3 memory controller (up to 1333MHz), Intel Turbo Boost 2.0 (3.10GHz), HT technology. Intel Core ThinkPad Edge E530 3259 (Intel) - T - withdrawn 3260-DWG A8-4500M 4GBx1 15.6' HD 720p 750G 5400 TP 11b/g/n.
laptops and netbooks :: thinkpad edge laptops :: thinkpad edge e535 - US. Lenovo System Update: Update Drivers, BIOS and Applications 2018-06-05 .
Zebris Port Devices Driver Jobs
laptops and netbooks :: thinkpad edge laptops :: thinkpad edge e435 - BG. for Windows 8 (32-bit, 64-bit), 7 (32-bit, 64-bit), XP - ThinkPad Edge E435, Edge E535 system program and Embedded Controller program) stored in the ThinkPad .
laptops and netbooks :: thinkpad edge laptops :: thinkpad edge e435contentdetail - US. 8 (32-bit, 64-bit), 7 (32-bit, 64-bit), XP - ThinkPad Edge E435, Edge E535 Package version; UEFI: UEFI BIOS version; ECP: Embedded Controller .
laptops and netbooks :: thinkpad edge laptops :: thinkpad edge e535 Lenovo PC Support - US. Select drivers that you want to update from below. Filters.
ThinkPad Edge E535 3260 (AMD) - S (T) - Win 8 - withdrawn Lenovo ThinkPad Edge E130 DDR3 memory controller (up to 1333MHz), HT technology 3260-DWG A8-4500M 4GBx1 15.6' HD 720p 750G 5400 TP 11b/g/n.
Broadcom BCM43142 Wireless LAN Driver (802.11b/g/n) for Windows 7 (32-bit, Lenovo B430; ThinkPad Edge E430, E435; ThinkPad Edge E530, E535 .
King Cobra L4v Driver for Sale
