Network device driver ppt

Device Driver Protocol o After driver knows which commands to issue, it starts to write them into controller's device registers. Device driver events and their associated interfacing functions between kernel space and user space. Events Kernel functions Read data inb Write data outb In user space, you can load the module as root by typing the following into the command line: insmod demo. It is possible to check that the module has been installed correctly by looking at all installed modules: lsmod Finally, the module can be removed from the kernel using the command: rmmod demo By issuing the lsmod command again, you can verify that the module is no longer in the kernel.

It is very similar to the well known printf apart from the fact that it only works inside the kernel. In this way, besides getting the message in the kernel system log files, you should also receive this message in the system console. This device will allow a character to be read from or written into it. These will also be explained in detail later. Next, the initialization and exit functions—used when loading and removing the module—are declared to the kernel. The major number is the one the kernel uses to link a file with its driver.

This function is used for memory allocation of the buffer in the device driver which resides in kernel space. Its use is very similar to the well known malloc function.

Finally, if registering the major number or allocating the memory fails, the module acts accordingly. This will free the major number for the kernel. It takes as arguments: an inode structure, which sends information to the kernel regarding the major number and minor number; and a file structure with information relative to the different operations that can be performed on a file.

Neither of these functions will be covered in depth within this article. In this simple example, though, these operations are not performed. But, once again, due to the simplicity of this example, none of these operations are performed.

If the position is at the beginning of the file, it is increased by one and the number of bytes that have been properly read is given as a return value, 1. If not at the beginning of the file, an end of file 0 is returned since the file only stores one byte.

The links are four-wire cables ground, power, and two signal wires that connect a device and a hub, just like twisted-pair Ethernet. This chapter describes the interaction between a driver and the USB core. These endpoints are usually small in size. These endpoints are usually much larger they can hold more characters at once than interrupt endpoints. These endpoints are common on printers, storage, and network devices.

USB interfaces handle only one type of a USB logical connection, such as a mouse, a keyboard, or a audio stream. Devices usually have one or more configurations. Every operating system has an Upper-level filter drivers optional Tags: device drivers. Latest Highest Rated. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.

And, best of all, most of its cool features are free and easy to use. You can use PowerShow. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.

You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all. Check out PowerShow. Related Books Free with a 30 day trial from Scribd. Related Audiobooks Free with a 30 day trial from Scribd. Elizabeth Howell. Network Adapter 1. Networks Network Adapter 1 2. Objective of this presentation 2 3. Role of NIC In networking 5 6. This is called a Bus. Serial port 9 Cisco, Intel etc.

Network Interface Card for connection of a computer to an Ethernet Network Driver Software 4. NIC Driver Configuration 4. Wireless NIC Configuration 21 NIC Driver Configuration 24 Currently Plug and Play operating systems have automated this task and default values are normally assigned. This means they can support a notional maximum transfer rate of 10, or Megabits per second. A bridge makes forwarding decision based on what information.

Thank You Vinu Raj Oct.