June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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I2C
I2C is a simple low speed 2-wire bus that is common on embedded boards, typically used to access peripherals that are not on the SoC, such as display controllers, camera sensors, GPIO extenders, and so on. There is a related standard known as system management bus (SMBus) that is found on PCs, which is used to access temperature and voltage sensors. SMBus is a subset of I2C.
I2C is a master-slave protocol with the master being one or more host controllers on the SoC. Slaves have a 7-bit address assigned by the manufacturer (read the data sheet), allowing up to 128 nodes per bus, but 16 are reserved, so only 112 nodes are allowed in practice. The master may initiate a read or write transactions with one of the slaves. Frequently, the first ...
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