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Interfacing with SPI Devices
The Serial Peripheral Interface (SPI) bus is yet another serial bus standard that you can use to connect peripherals to your Arduino. It is fast but uses four pins compared with the two that I2C uses. SPI is not actually a true bus, as the fourth pin is a Save Select (SS) pin. One Arduino pin must be used for SS for each peripheral on the bus. This setup effectively addresses the right peripheral on the bus by turning all the other peripherals off.
A wide range of SPI devices are available, including many of the same type of devices available for I2C. It is not uncommon for peripherals to have both I2C and SPI interfaces.
Bit Manipulation
SPI interfacing tends to involve a lot of bit manipulation to get data ...
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