Devices
Abstract
This chapter starts with a high-level explanation of how devices may be accessed in a modern computer system, and then explains that most devices on modern architectures are memory-mapped. Next, it explains how memory mapped devices can be accessed by user processes under Linux, by making use of the mmap system call. Code examples are given, showing how several devices can be mapped into the memory of a user-level program on the Raspberry Pi and pcDuino. Next the General Purpose I/O devices on both systems are explained, providing the reader with the opportunity to do a comparison between two different devices which perform almost precisely the same functions.
Keywords
Device; Memory map; General purpose I/O (GPIO); ...
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