Most embedded devices use standardized communication interfaces to interact with other chips, users, and the world. Since those interfaces are generally low level, rarely externally accessible, and dependent on interoperability between different manufacturers, they generally don’t have any protections, obfuscations, or encryption applied to them. In this chapter, we’ll discuss some electrical basics that are helpful for understanding how these various interface types work.
After that, we’ll look at examples from three groups of communications interfaces: low-speed ...
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