Name
SPI — SPI support
The Serial Peripheral Interface (SPI) is a low level synchronous protocol. Chips that support SPI can have data transfer rates up to several tens of Mbps. Chips are addressed with a controller and a chipselect. Most SPI slaves don't support dynamic device discovery; some are even write-only or read-only.
SPI is widely used by microcontrollers to talk with sensors, EEPROM and flash memory, codecs and various other controller chips, analog-to-digital and digital-to-analog converters, and more. MMC and SD cards can be accessed using SPI protocol; and for DataFlash cards used in MMC sockets, SPI must always be used.
SPI is one of a family of similar protocols using a four-wire interface (select, clock, data in, and data out), including Microwire (half duplex), SSP, SSI, and PSP. This driver framework should work with most such devices and controllers.
Get Linux Kernel in a Nutshell now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
