September 2011
Intermediate to advanced
744 pages
19h 4m
English
Content preview from Professional Windows® Embedded Compact 7Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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WHAT IS A DEVICE DRIVER?
A componentized operating system such as Windows Embedded Compact enables you to customize an embedded operating system by selecting only those drivers and applications that are needed and relevant. This enables you to make a smaller footprint.
When you add new hardware to a computer system, the operating system can’t use it until a suitable device driver is loaded for it. The system searches for a driver from a list of available drivers, and if found the system loads the driver; otherwise, you need to download or install the driver from media supplied with the hardware.
A device driver provides an interface between the operating system and the device and handles the transfer of data between the two. It also manages the configuration of the device and reads its status. For example, a serial port driver moves data from the port’s receive data register upon reception to a software buffer that applications can use. It places data in the transmit register when an application sends data, enabling the hardware to handle the transmission from there. Operating system calls to the driver configure such things as the baud rate and number of stops bits for the port. An application can check the status of the port through operating system calls to the driver.
A device driver provides input/output (I/O) through ports written to and read from by the device driver. The device driver manages the functional configuration of the device and checks its status. Finally, the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.