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LINUX DRIVES WEEDER I/O BOARDS

by Jack Dennon

Start ý Create the Device Driver ý Create the Device ý The Order of Things ý Load the Device Driver ý Call the Test Program ý Remove the Device Driver ý Sources and PDF

REMOVE THE DEVICE DRIVER

To remove the device driver, log in as root once more and use the command rmmod wtdio2_0. The only time you need to remove the device driver is when you want to replace it with a newer or modified version.

Linux is remarkably robust and more bullet-proof than the proprietary systems that I have used in the past. When working only on the user side of Linux, it is nearly impossible to hang the system. But, when new code is introduced on the kernel side, as is done when you install a device driver, you can cause breakage.

Fortunately, Linux is distributed in source-code form, so you can study the kernel itself to whatever depth is necessary to get your own kernel code to work. For an introduction to writing device driver modules, check out LINUX Kernel Module Programming Guide by Ori Pomerantz. [1] Advanced information is in the O'Reilly book LINUX Device Drivers by Alessandro Rubini. [2] And, for a gradual introduction to C programming with Linux, check out my book, Build Your Own LINUX C Toolbox. [3]

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