SPI
Serial Peripheral Interface — modes, polarity, and timing across vendor flavors.
Foundation 1h 20m readLow-speed
Four-wire full-duplex protocol, much faster than I²C. Ubiquitous for flash memory, ADCs, displays.
What you'll learn
- CPOL/CPHA modes (the source of half of all SPI bugs)
- Master and slave state machines
- Multi-slave: chip-select vs daisy chain
- Quad and dual SPI for high-bandwidth flash
- Building a multi-slave SPI master