Basics of I2C on Linux

on YouTube ↗49m

" summary

Covers I²C electrical basics, how buses and 7-bit addresses map into Linux device tree and sysfs, and the minimal kernel driver pattern (i2c_driver table + probe). Shows real driver code using SMBus helpers and the i2c_transfer "Swiss army knife" for multi-message sequences. Lists user tools i2cdetect/i2cdump/i2cget/i2cset and warns they can disturb the bus. Recommends oscilloscope and PulseView + cheap logic analyzer for missing ACKs, pull‑up problems, bus‑busy recovery, clock throttling, and reset-on-boot workarounds.

AI-written summary · about

" chapters (7)

1. 0:00Start
2. 0:45What is PC
3. 13:04Client device driver: i2c and device tree tables
4. 13:39Client device driver: probe function
5. 15:43Client device driver: requesting PC transactions
6. 26:23Logic analyzer
7. 28:18Troubleshooting tools

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