April 2022
Beginner to intermediate
708 pages
14h 54m
English
Content preview from Linux Device Driver Development - Second Edition
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Chapter 11: Implementing Direct Memory Access (DMA) Support
Direct Memory Access (DMA) is a feature of computer systems that allows devices to access the main system memory without CPU intervention, allowing the CPU to focus on other tasks. Examples of its usage include network traffic acceleration, audio data, or video frame grabbing, and its use is not limited to a particular domain. The peripheral responsible for managing the DMA transactions is the DMA controller, which is present in the majority of modern processors and microcontrollers.
The feature works in the following manner: When the driver needs to transfer a block of data, the driver sets up the DMA controller with the source address, the destination address, and the total number ...
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